EPAC: OLAF - Post-Tropical

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#101 Postby Yellow Evan » Sun Oct 18, 2015 9:23 am

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                    * EAST PACIFIC SHIPS INTENSITY FORECAST          *
                    * IR SAT DATA AVAILABLE,       OHC AVAILABLE     *
                    *  OLAF        EP192015  10/18/15  12 UTC        *

TIME (HR)          0     6    12    18    24    36    48    60    72    84    96   108   120
V (KT) NO LAND    65    69    73    78    84    92    92    91    92    90    91    84    84
V (KT) LAND       65    69    73    78    84    92    92    91    92    90    91    84    84
V (KT) LGE mod    65    70    76    81    87    96   104   110   111   107   102    96    92
Storm Type      TROP  TROP  TROP  TROP  TROP  TROP  TROP  TROP  TROP  TROP  TROP  TROP  TROP

SHEAR (KT)         9    12    11     9     7     5     4     2     6     6     7     7    15
SHEAR ADJ (KT)     4     3     2     0    -1    -5    -4     0    -1    -1     0     7     5
SHEAR DIR        331   334   328   334   351   349   270   222   183   156   151   186   208
SST (C)         30.0  29.9  29.8  29.7  29.6  29.5  29.5  29.4  29.2  28.9  28.7  28.3  27.7
POT. INT. (KT)   165   164   163   162   161   160   160   158   156   151   149   146   140
200 MB T (C)   -52.0 -51.9 -51.4 -51.8 -51.9 -51.2 -51.8 -51.2 -51.7 -51.1 -51.5 -50.9 -51.0
TH_E DEV (C)       8     7     8     7     7     7     8     8     8     8     8     8     8
700-500 MB RH     67    69    72    73    76    75    70    66    62    57    54    49    43
MODEL VTX (KT)    21    23    23    24    27    29    28    28    31    32    34    31    33
850 MB ENV VOR    12    14    15    29    38    58    53    77    87   108   116   115   118
200 MB DIV       113   138   137    91   101    91    66    64    70    72    58    53    24
700-850 TADV      -4    -6    -5    -7    -5    -3     0     5     5     4     4     4     4
LAND (KM)       2639  2541  2444  2337  2230  2035  1824  1627  1440  1308  1236  1185  1176
LAT (DEG N)      9.4   9.5   9.6   9.9  10.2  10.8  11.7  12.7  13.7  14.6  15.3  16.6  18.2
LONG(DEG W)    132.6 133.6 134.5 135.5 136.4 138.1 139.8 141.3 142.7 143.6 144.0 144.0 143.7
STM SPEED (KT)    10     9    10    10     9     9     9     8     8     5     5     7     8
HEAT CONTENT      23    22    22    24    24    19    25    26    23    25    30    32    24

  FORECAST TRACK FROM OFCI      INITIAL HEADING/SPEED (DEG/KT):275/ 10      CX,CY:  -9/  1
  T-12 MAX WIND:  55            PRESSURE OF STEERING LEVEL (MB):  678  (MEAN=581)
  GOES IR BRIGHTNESS TEMP. STD DEV.  50-200 KM RAD:   8.4 (MEAN=14.5)
  % GOES IR PIXELS WITH T < -20 C    50-200 KM RAD:  98.0 (MEAN=65.0)

                        INDIVIDUAL CONTRIBUTIONS TO INTENSITY CHANGE
                         6   12   18   24   36   48   60   72   84   96  108  120
                        ----------------------------------------------------------
  SAMPLE MEAN CHANGE     0.   0.   0.   1.   1.   1.   0.   0.  -1.  -1.  -2.  -2.
  SST POTENTIAL          1.   2.   4.   5.   7.   8.   9.  10.   9.   7.   6.   6.
  VERTICAL SHEAR MAG     0.  -1.  -1.  -1.   1.   3.   6.   8.   9.  10.  10.   9.
  VERTICAL SHEAR ADJ     0.   0.  -1.   0.   0.   1.   1.   1.   1.   1.   1.   0.
  VERTICAL SHEAR DIR     0.  -1.  -1.  -1.  -1.  -4.  -7.  -8.  -9.  -9.  -9.  -9.
  PERSISTENCE            2.   3.   4.   4.   3.   3.   2.   1.   1.   1.   1.   0.
  200/250 MB TEMP.       0.  -1.  -2.  -3.  -5.  -7.  -9. -11. -12. -13. -13. -13.
  THETA_E EXCESS         0.   0.   0.   0.  -1.  -1.  -1.  -2.  -2.  -2.  -2.  -2.
  700-500 MB RH          0.   0.   1.   1.   2.   2.   3.   3.   3.   3.   3.   3.
  MODEL VTX TENDENCY     0.   1.   2.   6.  10.   9.  10.  14.  16.  18.  14.  17.
  850 MB ENV VORTICITY   0.   0.   0.   0.   0.   1.   1.   2.   3.   4.   5.   7.
  200 MB DIVERGENCE      1.   2.   2.   3.   3.   3.   3.   2.   1.   0.  -1.  -3.
  850-700 T ADVEC        0.   0.   0.   0.   1.   0.   0.   0.   0.   0.   0.   1.
  ZONAL STORM MOTION     0.   0.   1.   1.   1.   1.   1.   1.   1.   1.   1.   1.
  STEERING LEVEL PRES    0.   0.   0.   0.   1.   1.   2.   2.   2.   2.   2.   2.
  DAYS FROM CLIM. PEAK   0.   0.   0.   0.   0.   0.   0.  -1.  -1.  -1.  -1.  -1.
  GOES PREDICTORS        1.   2.   3.   4.   4.   5.   5.   4.   3.   3.   3.   3.
  OCEAN HEAT CONTENT     0.   0.   0.   0.   0.   1.   1.   1.   1.   1.   1.   0.
                        ----------------------------------------------------------
  TOTAL CHANGE           4.   8.  13.  19.  27.  27.  26.  27.  25.  26.  19.  19.

   ** 2013 E. Pacific RI INDEX EP192015 OLAF       10/18/15  12 UTC **
           ( 30 KT OR MORE MAX WIND INCREASE IN NEXT 24 HR)
 
 12 HR PERSISTENCE (KT):  10.0 Range:-22.0 to  38.5 Scaled/Wgted Val:  0.5/  1.2
 850-200 MB SHEAR (KT) :   9.7 Range: 18.7 to   1.4 Scaled/Wgted Val:  0.5/  0.7
 POT = MPI-VMAX (KT)   :  97.9 Range: 40.3 to 141.7 Scaled/Wgted Val:  0.6/  0.6
 STD DEV OF IR BR TEMP :   8.4 Range: 38.9 to   2.4 Scaled/Wgted Val:  0.8/  0.9
 Heat content (KJ/cm2) :  23.0 Range:  3.6 to  75.9 Scaled/Wgted Val:  0.3/  0.2
 D200 (10**7s-1)       : 116.0 Range:-11.0 to 135.3 Scaled/Wgted Val:  0.9/  0.6
 % area w/pixels <-30 C:  96.0 Range: 41.4 to 100.0 Scaled/Wgted Val:  0.9/  0.5
 850-700 MB REL HUM (%):  75.4 Range: 57.6 to  96.8 Scaled/Wgted Val:  0.5/ -0.1
 
 Prob of RI for 25 kt RI threshold=    49% is   3.8 times the sample mean(13.1%)
 Prob of RI for 30 kt RI threshold=    33% is   3.8 times the sample mean( 8.7%)
 Prob of RI for 35 kt RI threshold=    25% is   4.1 times the sample mean( 6.0%)
 Prob of RI for 40 kt RI threshold=    21% is   5.0 times the sample mean( 4.3%)
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#102 Postby cycloneye » Sun Oct 18, 2015 9:36 am

HURRICANE OLAF DISCUSSION NUMBER 15
NWS NATIONAL HURRICANE CENTER MIAMI FL EP192015
800 AM PDT SUN OCT 18 2015

The could pattern of Olaf features a CDO with a primary convective
band extending into the southern and western semicircles. A 0726Z
GPM image showed a well-defined low- and mid-level eye, and the
initial intensity has been nudged upward to 70 kt, a little above
the latest Dvorak estimates from TAFB and SAB. Further strengthening
appears likely for the next couple of days while the hurricane moves
over warm waters and through a generally low-shear environment. The
SHIPS RI index continues to suggest that rapid intensification is
possible, with a 47 percent chance of a 25-kt increase in the next
24 hours. The new NHC intensity forecast is similar to the previous
one and is along the upper edge of the guidance, closest to the LGEM
forecast. By 72 hours, the cyclone will be moving over somewhat
cooler waters with a slight increase in shear, which should result
in slow weakening late in the period.

Olaf continues to move quickly westward, with an initial motion
estimate of 275/10. The track forecast reasoning remains unchanged,
with Olaf expected to gradually turn poleward during the forecast
period as the subtropical ridge initially to the northwest of Olaf
lifts northward and weakens. The track model guidance is in good
agreement on this scenario, but continues to trend toward a more
gradual northward turn. The new NHC track forecast has been adjusted
a little to the left of the previous one and is close to the latest
multi-model consensus.

FORECAST POSITIONS AND MAX WINDS

INIT 18/1500Z 9.5N 133.2W 70 KT 80 MPH
12H 19/0000Z 9.7N 134.5W 80 KT 90 MPH
24H 19/1200Z 10.2N 136.3W 90 KT 105 MPH
36H 20/0000Z 10.8N 138.0W 100 KT 115 MPH
48H 20/1200Z 11.6N 139.5W 110 KT 125 MPH
72H 21/1200Z 13.5N 142.4W 105 KT 120 MPH
96H 22/1200Z 15.5N 143.9W 95 KT 110 MPH
120H 23/1200Z 17.8N 144.1W 85 KT 100 MPH

$$
Forecaster Brennan
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#103 Postby Alyono » Sun Oct 18, 2015 12:12 pm

MU is flipping west. has a cat 3 very near Hawaii now
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#104 Postby Yellow Evan » Sun Oct 18, 2015 1:34 pm

TXPZ29 KNES 181820
TCSENP

A. 19E (OLAF)

B. 18/1800Z

C. 9.7N

D. 133.8W

E. THREE/GOES-W

F. T4.0/4.0/D1.0/24HRS

G. IR/EIR/VIS

H. REMARKS...WELL DEFINED CDO PATTERN USED WITH DIAMETER GREATER THAN
1.25 DEGREE AND LESS THAN 1.75 DEGREE WITH 0.5 ADDED FOR BANDING FEATURE
YIELDING A DT OF 4.0. MET AND PT AGREE. FT IS BASED ON DT.

I. ADDL POSITIONS

NIL


...KIBLER
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Re:

#105 Postby Yellow Evan » Sun Oct 18, 2015 1:52 pm

Alyono wrote:MU is flipping west. has a cat 3 very near Hawaii now


Image

I'm buying the ECMWF here rather than the GFS.

Image
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Re: EPAC: OLAF - Hurricane

#106 Postby Yellow Evan » Sun Oct 18, 2015 1:54 pm

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                    * EAST PACIFIC SHIPS INTENSITY FORECAST          *
                    * IR SAT DATA AVAILABLE,       OHC AVAILABLE     *
                    *  OLAF        EP192015  10/18/15  18 UTC        *

TIME (HR)          0     6    12    18    24    36    48    60    72    84    96   108   120
V (KT) NO LAND    70    73    76    82    86    94    94    98    98    95    94    89    86
V (KT) LAND       70    73    76    82    86    94    94    98    98    95    94    89    86
V (KT) LGE mod    70    73    77    81    85    94   104   112   115   112   108   102    91
Storm Type      TROP  TROP  TROP  TROP  TROP  TROP  TROP  TROP  TROP  TROP  TROP  TROP  TROP

SHEAR (KT)        11    10     8     4     4     2     2     8     6    10    10    14    14
SHEAR ADJ (KT)     4     4     0     0    -3    -6    -6    -4    -3    -1     0     4     5
SHEAR DIR        339   335   336   342   346   318   212   171   158   159   199   206   239
SST (C)         29.9  29.8  29.7  29.6  29.5  29.5  29.5  29.3  29.0  28.7  28.4  28.0  27.5
POT. INT. (KT)   164   163   162   161   159   159   159   157   153   150   146   143   137
200 MB T (C)   -51.8 -51.2 -51.8 -51.8 -51.8 -51.8 -51.8 -51.7 -51.6 -51.5 -51.1 -50.9 -51.1
TH_E DEV (C)       8     7     7     7     7     7     8     7     7     8     7     8     8
700-500 MB RH     69    73    73    75    77    73    68    66    61    56    51    47    47
MODEL VTX (KT)    23    24    24    26    27    28    27    31    33    34    36    35    35
850 MB ENV VOR    18    20    33    42    63    66    70    93   101   126   125   125   112
200 MB DIV       127   136   106   102   107    71    76    68    77    59    54    69    27
700-850 TADV      -5    -5    -6    -4    -4    -1     1     2     4     4     5     4     7
LAND (KM)       2502  2405  2308  2205  2103  1918  1730  1539  1367  1240  1173  1123  1099
LAT (DEG N)      9.6   9.8  10.0  10.3  10.6  11.2  12.2  13.1  14.0  15.0  16.1  17.3  18.4
LONG(DEG W)    133.9 134.8 135.7 136.6 137.5 139.1 140.5 142.0 143.3 144.1 144.3 144.4 144.4
STM SPEED (KT)    11     9     9     9     9     8     9     8     7     6     6     6     5
HEAT CONTENT      22    22    25    23    19    22    26    24    23    27    33    24    17

  FORECAST TRACK FROM OFCI      INITIAL HEADING/SPEED (DEG/KT):280/ 12      CX,CY: -11/  2
  T-12 MAX WIND:  65            PRESSURE OF STEERING LEVEL (MB):  685  (MEAN=581)
  GOES IR BRIGHTNESS TEMP. STD DEV.  50-200 KM RAD:   8.4 (MEAN=14.5)
  % GOES IR PIXELS WITH T < -20 C    50-200 KM RAD:  93.0 (MEAN=65.0)

                        INDIVIDUAL CONTRIBUTIONS TO INTENSITY CHANGE
                         6   12   18   24   36   48   60   72   84   96  108  120
                        ----------------------------------------------------------
  SAMPLE MEAN CHANGE     0.   0.   0.   1.   1.   1.   0.   0.  -1.  -1.  -2.  -2.
  SST POTENTIAL          1.   2.   3.   5.   7.   7.   7.   6.   5.   3.   1.   1.
  VERTICAL SHEAR MAG     0.  -1.   0.   1.   3.   6.   7.   8.   9.   9.   9.   8.
  VERTICAL SHEAR ADJ     0.   0.   0.   0.   1.   1.   1.   1.   1.   2.   2.   1.
  VERTICAL SHEAR DIR     0.   0.  -1.  -1.  -2.  -5.  -6.  -6.  -6.  -7.  -7.  -8.
  PERSISTENCE            1.   1.   2.   2.   1.   1.   0.   0.   0.   0.   0.   0.
  200/250 MB TEMP.       0.  -1.  -2.  -3.  -5.  -7.  -9. -11. -13. -13. -14. -13.
  THETA_E EXCESS         0.   0.   0.  -1.  -1.  -1.  -2.  -2.  -2.  -2.  -2.  -3.
  700-500 MB RH          0.   0.   1.   1.   2.   2.   3.   3.   3.   3.   3.   3.
  MODEL VTX TENDENCY     0.   1.   3.   4.   7.   7.  12.  15.  17.  19.  18.  17.
  850 MB ENV VORTICITY   0.   0.   0.   0.   1.   1.   2.   2.   4.   5.   7.   8.
  200 MB DIVERGENCE      1.   1.   2.   3.   3.   3.   3.   2.   1.   0.  -1.  -3.
  850-700 T ADVEC        0.   0.   0.   0.   0.   0.   0.   0.   0.   0.   0.   1.
  ZONAL STORM MOTION     0.   0.   1.   1.   2.   2.   3.   3.   2.   2.   2.   2.
  STEERING LEVEL PRES    0.   0.   0.   0.   1.   1.   2.   2.   2.   3.   2.   3.
  DAYS FROM CLIM. PEAK   0.   0.   0.   0.   0.   0.   0.  -1.  -1.  -1.  -1.  -1.
  GOES PREDICTORS        1.   2.   2.   3.   3.   4.   4.   3.   3.   2.   2.   2.
  OCEAN HEAT CONTENT     0.   0.   0.   0.   0.   1.   1.   1.   1.   1.   1.   0.
                        ----------------------------------------------------------
  TOTAL CHANGE           3.   6.  12.  16.  24.  24.  28.  28.  25.  24.  19.  16.

   ** 2013 E. Pacific RI INDEX EP192015 OLAF       10/18/15  18 UTC **
           ( 30 KT OR MORE MAX WIND INCREASE IN NEXT 24 HR)
 
 12 HR PERSISTENCE (KT):   5.0 Range:-22.0 to  38.5 Scaled/Wgted Val:  0.4/  1.0
 850-200 MB SHEAR (KT) :   7.5 Range: 18.7 to   1.4 Scaled/Wgted Val:  0.6/  0.9
 POT = MPI-VMAX (KT)   :  91.8 Range: 40.3 to 141.7 Scaled/Wgted Val:  0.5/  0.5
 STD DEV OF IR BR TEMP :   8.4 Range: 38.9 to   2.4 Scaled/Wgted Val:  0.8/  0.9
 Heat content (KJ/cm2) :  22.2 Range:  3.6 to  75.9 Scaled/Wgted Val:  0.3/  0.2
 D200 (10**7s-1)       : 115.6 Range:-11.0 to 135.3 Scaled/Wgted Val:  0.9/  0.6
 % area w/pixels <-30 C:  89.0 Range: 41.4 to 100.0 Scaled/Wgted Val:  0.8/  0.4
 850-700 MB REL HUM (%):  75.4 Range: 57.6 to  96.8 Scaled/Wgted Val:  0.5/ -0.1
 
 Prob of RI for 25 kt RI threshold=    43% is   3.3 times the sample mean(13.1%)
 Prob of RI for 30 kt RI threshold=    31% is   3.6 times the sample mean( 8.7%)
 Prob of RI for 35 kt RI threshold=    22% is   3.6 times the sample mean( 6.0%)
 Prob of RI for 40 kt RI threshold=    18% is   4.1 times the sample mean( 4.3%)
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#107 Postby Alyono » Sun Oct 18, 2015 2:02 pm

EC is generally east of its ensemble. At least the 0Z was
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#108 Postby Kingarabian » Sun Oct 18, 2015 2:03 pm

:uarrow:

Can't buy anything right now. Each run of the past 4 Euro runs have been shifting west slowly. Plus it only goes out to 240 hours where the system starts to stall or slow down considerably after it recurves - which probably indicates the high building back. The end of this 12z run it has a strong Olaf moving back west.

The trend is basically near or close to Hawaii. Basically the ensembles are not budging at this time and I think the operational models will follow the ensembles around. Similar to what we saw with Joaquin. Of course they could all be underestimating that trough and this system can take off to the NE somewhere. Especially when we factor in Climo.
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#109 Postby Kingarabian » Sun Oct 18, 2015 2:23 pm

Image

Was expecting to see an eye by now considering the good out flow to the north and the great flow to the south. unclosed eyewall on microwave.
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#110 Postby Yellow Evan » Sun Oct 18, 2015 2:44 pm

----- Current Analysis -----
Date : 18 OCT 2015 Time : 190000 UTC
Lat : 9:35:25 N Lon : 133:49:37 W


CI# /Pressure/ Vmax
4.0 / 989.7mb/ 65.0kt


Final T# Adj T# Raw T#
3.9 3.9 3.9

Center Temp : -68.5C Cloud Region Temp : -68.1C

Scene Type : UNIFORM CDO CLOUD REGION
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Re: EPAC: OLAF - Hurricane

#111 Postby cycloneye » Sun Oct 18, 2015 3:56 pm

HURRICANE OLAF DISCUSSION NUMBER 16
NWS NATIONAL HURRICANE CENTER MIAMI FL EP192015
200 PM PDT SUN OCT 18 2015

Olaf hasn't changed much in organization during the past few hours,
with satellite imagery still showing a CDO and a large, but broken,
convective band in the western and southern semicircles of the
cyclone. There appears to be a dry slot working into the western
side of the circulation, and the eye has been less distinct in
recent microwave imagery than it was earlier. The initial intensity
remains 70 kt, a little higher than the latest Dvorak estimates from
TAFB, SAB, and the UW-CIMSS ADT. The initial 34- and 50-kt wind
radii were adjusted based on a timely 1815Z ASCAT-B overpass.

The pause in strengthening could be due to the aforementioned dry
air and moderate west-northwesterly to northwesterly shear analyzed
over the cyclone by the SHIPS model and UW-CIMSS. Given the shear
and an inner-core that may be a little less organized, the new NHC
intensity forecast shows a slower rate of strengthening in the first
couple of days, and is now closer to the bulk of the intensity
guidance. The forecast still shows Olaf becoming a major hurricane
in 2-3 days followed by a slow decay as the hurricane moves over
somewhat cooler SSTs late in the period. The NHC prediction is close
to the SHIPS model through much of the period, but a little above it
at peak intensity.

Olaf continues to move quickly westward, with a motion now estimated
at 280/12. This continues a trend of the hurricane moving faster and
to the left of the previous couple of forecasts. While the
subtropical ridge to the north weakens is still expected to weaken
and lift northward, the track model guidance continues to shift
westward given the initial motion and Olaf failing to gain as much
latitude as previously thought in the short term. The new NHC track
forecast has been adjusted to the left of the previous one,
especially at days 3 through 5, and is now close to a blend of the
latest ECMWF and GFS forecasts.

FORECAST POSITIONS AND MAX WINDS

INIT 18/2100Z 9.7N 134.3W 70 KT 80 MPH
12H 19/0600Z 9.9N 135.7W 75 KT 85 MPH
24H 19/1800Z 10.3N 137.5W 85 KT 100 MPH
36H 20/0600Z 11.0N 139.1W 95 KT 110 MPH
48H 20/1800Z 11.8N 140.6W 105 KT 120 MPH
72H 21/1800Z 13.7N 143.4W 105 KT 120 MPH
96H 22/1800Z 16.0N 145.0W 95 KT 110 MPH
120H 23/1800Z 18.0N 145.0W 85 KT 100 MPH

$$
Forecaster Brennan
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#112 Postby Alyono » Sun Oct 18, 2015 5:31 pm

and now the worthless MU flips back east

This may be a razor thin event like Joaquin was
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Re:

#113 Postby Kingarabian » Sun Oct 18, 2015 5:38 pm

Alyono wrote:and now the worthless MU flips back east

This may be a razor thin event like Joaquin was


It's moving west now. Bad handle on the strength of the trough this far out it seems.
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#114 Postby Kingarabian » Sun Oct 18, 2015 7:51 pm

Eye trying to clear out:

Image
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#115 Postby Yellow Evan » Sun Oct 18, 2015 8:17 pm

Eye seems to be clearing out to some extent for now. Likely however to be overshot by the CDO again soon.
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#116 Postby Yellow Evan » Sun Oct 18, 2015 8:17 pm

19/0000 UTC 9.5N 135.0W T4.5/4.5 OLAF -- East Pacific
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Re: EPAC: OLAF - Hurricane

#117 Postby Yellow Evan » Sun Oct 18, 2015 8:18 pm

Code: Select all

                    * EAST PACIFIC SHIPS INTENSITY FORECAST          *
                    * IR SAT DATA AVAILABLE,       OHC AVAILABLE     *
                    *  OLAF        EP192015  10/19/15  00 UTC        *

TIME (HR)          0     6    12    18    24    36    48    60    72    84    96   108   120
V (KT) NO LAND    85    90    95   100   104   107   107   105   103   100    96    90    83
V (KT) LAND       85    90    95   100   104   107   107   105   103   100    96    90    83
V (KT) LGE mod    85    92    98   104   108   114   119   120   117   111   105    93    80
Storm Type      TROP  TROP  TROP  TROP  TROP  TROP  TROP  TROP  TROP  TROP  TROP  TROP  TROP

SHEAR (KT)        11    10     7     7     5     4     1     5     8     7     4    14     7
SHEAR ADJ (KT)     5     3     0    -1    -4    -5    -2    -4    -2    -2     3     0     6
SHEAR DIR        345   337   353   347   328   322   242   174   158   179   232   207   213
SST (C)         29.7  29.6  29.6  29.6  29.5  29.5  29.4  29.2  28.8  28.6  28.2  27.8  27.5
POT. INT. (KT)   162   161   160   160   159   159   158   156   151   149   144   140   136
200 MB T (C)   -51.2 -51.8 -52.0 -52.0 -51.5 -51.9 -51.3 -51.7 -51.1 -51.3 -50.5 -51.4 -50.8
TH_E DEV (C)       7     7     7     7     7     7     7     7     8     8     8     8     8
700-500 MB RH     71    73    75    76    77    73    72    66    59    50    47    47    50
MODEL VTX (KT)    22    23    24    26    26    27    29    30    32    34    34    34    31
850 MB ENV VOR    21    33    40    58    64    65    74    93   110   121   119   108    96
200 MB DIV       127   108   101   106   110    83    95    78    86    52    95    59    53
700-850 TADV      -4    -3    -3    -4    -2     0     1     3     5     6     7     5     3
LAND (KM)       2396  2298  2199  2110  2021  1825  1639  1451  1277  1143  1061  1028  1030
LAT (DEG N)      9.6   9.8   9.9  10.2  10.4  11.2  12.0  13.0  14.1  15.2  16.4  17.4  18.2
LONG(DEG W)    135.0 136.0 136.9 137.7 138.5 140.1 141.6 143.0 144.2 145.0 145.3 145.3 145.1
STM SPEED (KT)    10     9     9     8     8     8     9     8     7     6     6     5     4
HEAT CONTENT      22    23    24    23    24    29    25    22    23    32    31    21    16

  FORECAST TRACK FROM OFCI      INITIAL HEADING/SPEED (DEG/KT):275/ 11      CX,CY: -10/  1
  T-12 MAX WIND:  70            PRESSURE OF STEERING LEVEL (MB):  627  (MEAN=581)
  GOES IR BRIGHTNESS TEMP. STD DEV.  50-200 KM RAD:   7.1 (MEAN=14.5)
  % GOES IR PIXELS WITH T < -20 C    50-200 KM RAD: 100.0 (MEAN=65.0)

                        INDIVIDUAL CONTRIBUTIONS TO INTENSITY CHANGE
                         6   12   18   24   36   48   60   72   84   96  108  120
                        ----------------------------------------------------------
  SAMPLE MEAN CHANGE     0.   0.   0.   1.   1.   1.   0.   0.  -1.  -1.  -2.  -2.
  SST POTENTIAL          0.   2.   3.   3.   3.   1.  -1.  -3.  -7. -10. -13. -13.
  VERTICAL SHEAR MAG    -1.  -1.  -1.  -1.   1.   4.   6.   8.   9.  10.   9.   9.
  VERTICAL SHEAR ADJ     0.   0.   0.   0.   1.   1.   1.   1.   1.   1.   1.   1.
  VERTICAL SHEAR DIR     0.   0.   0.  -1.  -2.  -5.  -6.  -7.  -7.  -8.  -9.  -9.
  PERSISTENCE            4.   5.   6.   6.   4.   3.   2.   1.   1.   1.   0.   0.
  200/250 MB TEMP.       0.  -1.  -2.  -3.  -5.  -7.  -8. -10. -12. -13. -13. -13.
  THETA_E EXCESS         0.   0.   0.  -1.  -1.  -1.  -1.  -2.  -2.  -2.  -2.  -2.
  700-500 MB RH          0.   0.   1.   1.   2.   3.   3.   3.   3.   3.   3.   2.
  MODEL VTX TENDENCY     0.   1.   3.   4.   7.  10.  11.  14.  18.  18.  17.  13.
  850 MB ENV VORTICITY   0.   0.   0.   0.   1.   1.   2.   3.   4.   6.   7.   8.
  200 MB DIVERGENCE      1.   1.   2.   3.   3.   3.   3.   2.   1.   0.  -1.  -3.
  850-700 T ADVEC        0.   0.   0.   0.   0.   0.   0.   0.   0.   0.   0.   1.
  ZONAL STORM MOTION     0.   0.   1.   1.   2.   2.   2.   2.   2.   2.   2.   2.
  STEERING LEVEL PRES    0.   0.   0.   0.   0.   1.   1.   1.   1.   1.   1.   1.
  DAYS FROM CLIM. PEAK   0.   0.   0.   0.   0.   0.   0.  -1.  -1.  -1.  -1.  -1.
  GOES PREDICTORS        1.   2.   3.   3.   4.   5.   5.   4.   4.   4.   4.   3.
  OCEAN HEAT CONTENT     0.   0.   0.   0.   1.   1.   1.   1.   1.   1.   1.   0.
                        ----------------------------------------------------------
  TOTAL CHANGE           5.  10.  15.  19.  22.  22.  20.  18.  15.  11.   5.  -2.

   ** 2013 E. Pacific RI INDEX EP192015 OLAF       10/19/15  00 UTC **
           ( 30 KT OR MORE MAX WIND INCREASE IN NEXT 24 HR)
 
 12 HR PERSISTENCE (KT):  15.0 Range:-22.0 to  38.5 Scaled/Wgted Val:  0.6/  1.4
 850-200 MB SHEAR (KT) :   8.1 Range: 18.7 to   1.4 Scaled/Wgted Val:  0.6/  0.9
 POT = MPI-VMAX (KT)   :  75.6 Range: 40.3 to 141.7 Scaled/Wgted Val:  0.3/  0.4
 STD DEV OF IR BR TEMP :   7.1 Range: 38.9 to   2.4 Scaled/Wgted Val:  0.9/  0.9
 Heat content (KJ/cm2) :  23.2 Range:  3.6 to  75.9 Scaled/Wgted Val:  0.3/  0.2
 D200 (10**7s-1)       : 110.4 Range:-11.0 to 135.3 Scaled/Wgted Val:  0.8/  0.6
 % area w/pixels <-30 C:  99.0 Range: 41.4 to 100.0 Scaled/Wgted Val:  1.0/  0.5
 850-700 MB REL HUM (%):  76.2 Range: 57.6 to  96.8 Scaled/Wgted Val:  0.5/ -0.1
 
 Prob of RI for 25 kt RI threshold=    48% is   3.6 times the sample mean(13.1%)
 Prob of RI for 30 kt RI threshold=    36% is   4.1 times the sample mean( 8.7%)
 Prob of RI for 35 kt RI threshold=    26% is   4.4 times the sample mean( 6.0%)
 Prob of RI for 40 kt RI threshold=    26% is   6.0 times the sample mean( 4.3%)
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#118 Postby cycloneye » Sun Oct 18, 2015 9:43 pm

HURRICANE OLAF DISCUSSION NUMBER 17
NWS NATIONAL HURRICANE CENTER MIAMI FL EP192015
800 PM PDT SUN OCT 18 2015

Olaf's inner-core convective pattern has improved significantly
since the previous advisory. A cloud-filled eye about 15 n mi in
diameter has become apparent in visible, infrared, and passive
microwave satellite data since around 18/2300Z, and cloud tops have
cooled to below -80C almost encircling the eye during the past hour.
The initial intensity has been increased to 85 kt based on a blend
of Dvorak satellite intensity estimates of T5.0/90 kt from TAFB and
T4.5/77 kt from SAB. This intensity is supported by NHC AODT
satellite intensity estimates of T4.8/85 kt and T5.2/95 kt using
embedded-center and obscured-eye patterns, respectively.

The initial motion estimate is 275/10 kt based on microwave and
visible eye fixes. Other than a slight southward adjustment due to
the recent eye positions, the previous forecast track and reasoning
essentially remain unchanged. Olaf is expected to gradually round
the southwestern and western portion of a deep-layer subtropical
ridge, turning northward and slowing down considerably on days 4 and
5 as the hurricane moves into a weakness in the ridge. The westward
shift in the guidance as mentioned in the previous discussion
appears to have settled down on this latest cycle with the UKMET and
the other models now having moved closer together. The new NHC track
forecast has been adjusted slightly to the left of the previous
advisory track due to the more southward initial position, and lies
between the consensus models and the more westward UKMET solution.

Although Olaf has made a sharp intensity comeback, the proximity of
a pronounced dry slot that has worked its way completely around the
small inner-core convective region of the hurricane precludes
forecasting rapid intensification at this time. However, with the
vertical shear expected to be near or below 5 kt for the next 72
hours while Olaf remains over 29C or greater SSTs, at least steady
strengthening appears to be in order for the next 36 hours or so.
Although the LGEM intensity guidance brings Olaf to category 4
strength (115-120 kt) in the 36-72 h period, the official forecast
levels off the intensity at 110 kt due to the likelihood of one or
more eyewall replacement cycles occurring during that time. By days
4 and 5, a gradual weakening trend is forecast to occur as Olaf
moves into a region of much drier mid-level air with humidity values
less than 50 percent, along with cold upwelling occurring beneath
the cyclone due to the hurricane's expected slower forward speed of
around 5 kt.

FORECAST POSITIONS AND MAX WINDS

INIT 19/0300Z 9.7N 135.4W 85 KT 100 MPH
12H 19/1200Z 9.9N 136.8W 95 KT 110 MPH
24H 20/0000Z 10.3N 138.6W 105 KT 120 MPH
36H 20/1200Z 11.0N 140.2W 110 KT 125 MPH
48H 21/0000Z 11.9N 141.6W 110 KT 125 MPH
72H 22/0000Z 13.7N 144.1W 110 KT 125 MPH
96H 23/0000Z 16.1N 145.4W 100 KT 115 MPH
120H 24/0000Z 18.2N 145.4W 90 KT 105 MPH

$$
Forecaster Stewart
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Re: EPAC: OLAF - Hurricane

#119 Postby Yellow Evan » Sun Oct 18, 2015 10:21 pm

Image

As I expected, the CDO overshot the eye. Glad this isn't trying to clear an eye at Cat 1.
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#120 Postby Alyono » Sun Oct 18, 2015 11:21 pm

looks like a decent west shift in the MU
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