EPAC: INVEST 91E

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Re: EPAC: INVEST 91E

#21 Postby cycloneye » Mon May 30, 2016 8:37 pm

The shear forecast continues to be favorable. 00z run.

Code: Select all

                    * EAST PACIFIC SHIPS INTENSITY FORECAST          *
                    * IR SAT DATA AVAILABLE,       OHC AVAILABLE     *
                    *  INVEST      EP912016  05/31/16  00 UTC        *

TIME (HR)          0     6    12    18    24    36    48    60    72    84    96   108   120
V (KT) NO LAND    20    21    24    28    32    40    50    57    65    68    69    68    67
V (KT) LAND       20    21    24    28    32    40    50    57    65    68    69    68    67
V (KT) LGEM       20    20    21    21    22    24    27    32    37    42    46    47    47
Storm Type      TROP  TROP  TROP  TROP  TROP  TROP  TROP  TROP  TROP  TROP  TROP  TROP  TROP

SHEAR (KT)         9    12    13    12    11     8     8     6     7     1     4     7    13
SHEAR ADJ (KT)     0     0    -2     0     2     5     3     5     4     8     7     3    -3
SHEAR DIR         97   117   101    96    82    53    76    31    49    92   267   360    27
SST (C)         29.5  29.5  29.5  29.5  29.5  29.6  29.8  29.8  29.8  29.7  29.5  29.3  29.4
POT. INT. (KT)   157   158   158   158   158   159   162   162   162   162   159   155   155
200 MB T (C)   -51.8 -52.1 -52.2 -52.1 -52.1 -52.9 -52.7 -53.3 -52.7 -53.1 -52.6 -52.9 -52.7
200 MB VXT (C)   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0  -0.1  -0.1  -0.2   0.0  -0.1
TH_E DEV (C)       7     7     7     7     7     7     7     7     7     6     6     6     7
700-500 MB RH     71    71    71    70    68    66    65    66    65    65    63    62    59
MODEL VTX (KT)     4     6     6     8     8     6     6     5     7     7     9    10    11
850 MB ENV VOR    27    34    29    30    32    22    20    28    33    23    34    39    47
200 MB DIV        29    27    30    53    72   101   102    94    74    27     7    24    41
700-850 TADV       1     3     0    -1    -2     0     0    -1    -1     0     0    -1    -1
LAND (KM)       1265  1279  1308  1332  1361  1448  1576  1728  1905  2043  2189  2266  2248
LAT (DEG N)      8.8   8.9   9.0   9.1   9.1   8.9   8.6   8.0   7.4   6.8   6.2   6.0   6.4
LONG(DEG W)    109.8 110.2 110.8 111.4 111.9 113.0 114.5 115.9 117.6 119.2 120.8 121.8 122.1
STM SPEED (KT)     4     5     6     5     5     6     8     8     8     9     7     3     3
HEAT CONTENT      64    65    68    73    79    86    69    34    24    22    23    29    29

  FORECAST TRACK FROM TABM      INITIAL HEADING/SPEED (DEG/KT):285/  3      CX,CY:  -2/  1
  T-12 MAX WIND:  20            PRESSURE OF STEERING LEVEL (MB):  624  (MEAN=586)
  GOES IR BRIGHTNESS TEMP. STD DEV.  50-200 KM RAD:  12.7 (MEAN=14.5)
  % GOES IR PIXELS WITH T < -20 C    50-200 KM RAD:  41.0 (MEAN=65.0)
  PRELIM RI PROB (DV .GE. 30 KT IN 24 HR):           11.0

                        INDIVIDUAL CONTRIBUTIONS TO INTENSITY CHANGE
                         6   12   18   24   36   48   60   72   84   96  108  120
                        ----------------------------------------------------------
  SAMPLE MEAN CHANGE     0.   0.   1.   1.   1.   1.   1.   1.   0.  -1.  -1.  -2.
  SST POTENTIAL          0.  -1.  -1.   0.   6.  14.  22.  29.  33.  35.  37.  37.
  VERTICAL SHEAR MAG     1.   1.   2.   2.   2.   2.   3.   4.   5.   7.   8.   9.
  VERTICAL SHEAR ADJ     0.   0.   0.   0.  -1.  -1.  -1.  -1.  -1.  -1.  -1.  -1.
  VERTICAL SHEAR DIR     1.   1.   2.   4.   6.   9.  11.  13.  14.  10.   8.   8.
  PERSISTENCE            0.   0.   0.  -1.  -1.  -1.  -1.   0.   0.   0.   0.   1.
  200/250 MB TEMP.       0.   0.   0.   0.   0.  -1.  -2.  -3.  -4.  -4.  -4.  -5.
  THETA_E EXCESS         0.   0.   0.   0.   0.   1.   1.   1.   1.   1.   1.   1.
  700-500 MB RH          0.   0.   0.   0.   1.   1.   1.   1.   1.   1.   1.   1.
  MODEL VTX TENDENCY     0.   1.   3.   3.   2.   2.   1.   3.   3.   6.   7.   7.
  850 MB ENV VORTICITY   0.   0.   0.   0.   0.   0.   0.   0.   0.   0.   0.   0.
  200 MB DIVERGENCE      0.   0.   0.   0.   1.   2.   3.   3.   3.   2.   2.   1.
  850-700 T ADVEC        0.   0.   0.   0.   0.   0.   0.   0.   0.   0.   0.   0.
  ZONAL STORM MOTION     0.   0.  -1.  -1.  -2.  -2.  -3.  -2.  -2.  -1.  -1.  -1.
  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.  -2.  -2.  -2.
  GOES PREDICTORS        0.   0.   1.   1.   0.  -2.  -4.  -5.  -6.  -7.  -8.  -8.
  OCEAN HEAT CONTENT     0.   1.   2.   2.   4.   4.   3.   2.   1.   1.   1.   0.
                        ----------------------------------------------------------
  TOTAL CHANGE           1.   4.   8.  12.  20.  30.  37.  45.  48.  49.  48.  47.

                CURRENT MAX WIND (KT):   20. LAT, LON:    8.8   109.8

      ** 2015 E. Pacific RI INDEX EP912016 INVEST     05/31/16  00 UTC **
 (SHIPS-RII PREDICTOR TABLE for 30 KT OR MOREMAXIMUM WIND INCREASE IN NEXT 24-h)
 
     Predictor             Value   RI Predictor Range  Scaled Value(0-1) % Contribution
 12 HR PERSISTENCE (KT):     0.0     -22.0  to   38.5       0.36         999.0
 POT = MPI-VMAX (KT)   :   137.7      40.3  to  144.5       0.93         999.0
 HEAT CONTENT (KJ/cm2) :    69.8       0.0  to   75.9       0.92         999.0
 STD DEV OF IR BR TEMP :    12.7      38.9  to    2.1       0.71         999.0
 850-200 MB SHEAR (KT) :    11.4      18.9  to    1.4       0.43         999.0
 MAXIMUM WIND (kt)     :    20.0      22.5  to  132.0       0.00           0.0
 D200 (10**7s-1)       :    42.2     -11.0  to  135.3       0.36         999.0
 BL DRY-AIR FLUX (w/m2):    54.2     638.0  to  -68.2       0.83         999.0
 2nd PC OF IR BR TEMP  :     0.6       2.1  to   -1.7       0.38         999.0
 % AREA WITH TPW <45 mm:     0.0      81.4  to    0.0       1.00         999.0
 
 SHIPS Prob RI for 20kt/ 12hr RI threshold=   0% is   0.0 times sample mean ( 6.3%)
 SHIPS Prob RI for 25kt/ 24hr RI threshold=   0% is   0.0 times sample mean (12.9%)
 SHIPS Prob RI for 30kt/ 24hr RI threshold=   0% is   0.0 times sample mean ( 8.6%)
 SHIPS Prob RI for 35kt/ 24hr RI threshold=   0% is   0.0 times sample mean ( 5.8%)
 SHIPS Prob RI for 40kt/ 24hr RI threshold=   0% is   0.0 times sample mean ( 4.1%)
 SHIPS Prob RI for 45kt/ 36hr RI threshold=   0% is   0.0 times sample mean ( 7.1%)
 SHIPS Prob RI for 55kt/ 48hr RI threshold=   0% is   0.0 times sample mean ( 5.9%)
 
 Matrix of RI probabilities
 ---------------------------------------------------------------------
  RI (kt / h)  | 20/12 | 25/24 | 30/24 | 35/24 | 40/24 | 45/36 | 55/48
 ---------------------------------------------------------------------
   SHIPS-RII:     0.0%    0.0%    0.0%    0.0%    0.0%    0.0%    0.0%
    Logistic:     2.6%   13.2%   10.5%    2.1%    1.0%   20.4%    6.6%
    Bayesian:     0.0%    5.8%    4.4%    1.0%    0.2%    0.0%    1.2%
   Consensus:     0.9%    6.3%    4.9%    1.0%    0.4%    6.8%    2.6%

   ##         ANNULAR HURRICANE INDEX (AHI) EP912016 INVEST     05/31/16  00 UTC         ##
   ## STORM NOT ANNULAR, SCREENING STEP FAILED, NPASS=5 NFAIL=2                          ##
   ## AHI=  0   (AHI OF 100 IS BEST FIT TO ANN. STRUC., 1 IS MARGINAL, 0 IS NOT ANNULAR) ##
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Re: EPAC: INVEST 91E

#22 Postby stormwise » Mon May 30, 2016 9:46 pm

Yellow Evan wrote:Looks much better now let's see if it can hold and develop a well-defined center, which appeared to be very broad earlier and it's too soon to tell if it's consolidated or not.


Only need evidence of westley winds to prove a closed off low. There appears to be a outflow on microwave.

As pointed out by SouthdateFish on another thread.

This is a common misconception. There is no minimum wind requirement for a TD. Refer to the NHC glossary:

http://www.nhc.noaa.gov/aboutgloss.shtml#t
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Re: EPAC: INVEST 91E

#23 Postby cycloneye » Mon May 30, 2016 9:49 pm

We need an ASCAT pass to see what is going on.Hopefully it comes soon enough.
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Re: EPAC: INVEST 91E

#24 Postby stormwise » Mon May 30, 2016 10:08 pm

Given the MJO is over the area and the sat appearance i would think the westerlies are a given. But as you say a wind pass and time will tell.

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Re: EPAC: INVEST 91E

#25 Postby stormwise » Mon May 30, 2016 10:43 pm

http://www.ssd.noaa.gov/PS/TROP/floater ... imated.gif
Looking at the shortwave loop i have no doubt this is a TD.



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Re: EPAC: INVEST 91E

#26 Postby Yellow Evan » Mon May 30, 2016 11:29 pm

stormwise wrote:
Yellow Evan wrote:Looks much better now let's see if it can hold and develop a well-defined center, which appeared to be very broad earlier and it's too soon to tell if it's consolidated or not.


Only need evidence of westley winds to prove a closed off low. There appears to be a outflow on microwave.

As pointed out by SouthdateFish on another thread.

This is a common misconception. There is no minimum wind requirement for a TD. Refer to the NHC glossary:

http://www.nhc.noaa.gov/aboutgloss.shtml#t


Correct. I never said there was a wind requirement. Just needs a well-defined (aka as closed) center, which there's no evidence yet, and persistent organized convention.
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Re: EPAC: INVEST 91E

#27 Postby Kingarabian » Mon May 30, 2016 11:35 pm

00z GFS not too bullish 200 hours out. But still develops it into a strong TS moving it west.
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Re: EPAC: INVEST 91E

#28 Postby stormwise » Tue May 31, 2016 12:21 am

Yellow Evan wrote:
stormwise wrote:
Yellow Evan wrote:Looks much better now let's see if it can hold and develop a well-defined center, which appeared to be very broad earlier and it's too soon to tell if it's consolidated or not.


Only need evidence of westley winds to prove a closed off low. There appears to be a outflow on microwave.

As pointed out by SouthdateFish on another thread.

This is a common misconception. There is no minimum wind requirement for a TD. Refer to the NHC glossary:

http://www.nhc.noaa.gov/aboutgloss.shtml#t


Correct. I never said there was a wind requirement. Just needs a well-defined (aka as closed) center, which there's no evidence yet, and persistent organized convention.

Image
91E

Do you have any evidence its not closed ?, as for persistent organized convention... a naked swirl was classified in the ATL.
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Re: EPAC: INVEST 91E

#29 Postby NotoSans » Tue May 31, 2016 12:39 am

:uarrow:
There is no concrete evidence suggesting that the system exhibits a well-defined, closed surface circulation, which is needed for an upgrade. The best thing to do would be waiting for ASCAT passes.
And Bonnie DOES have persistent organized deep convection when it was named. Also, it was declared as a remnant low when it had been devoid of deep convection for a period of time. Not contradictory to the NHC definition.
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Re: EPAC: INVEST 91E

#30 Postby stormwise » Tue May 31, 2016 12:54 am

when bonnie was classified as a TD it was naked from shear, never said this is anything other than a TD.
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Re: EPAC: INVEST 91E

#31 Postby Kingarabian » Tue May 31, 2016 1:15 am

ZCZC MIATWOEP ALL
TTAA00 KNHC DDHHMM

TROPICAL WEATHER OUTLOOK
NWS NATIONAL HURRICANE CENTER MIAMI FL
1100 PM PDT MON MAY 30 2016

For the eastern North Pacific...east of 140 degrees west longitude:

1. An elongated area of low pressure located about 900 miles south of
the southern tip of the Baja California peninsula is producing
disorganized showers and thunderstorms. Environmental conditions are
expected to be conducive for gradual development of this system, and
a tropical depression is likely to form by the end of the week as
the disturbance moves west-northwestward to westward at 5 to 10 mph.
* Formation chance through 48 hours...low...10 percent
* Formation chance through 5 days...high...80 percent

Forecaster Stewart
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Re: EPAC: INVEST 91E

#32 Postby stormwise » Tue May 31, 2016 1:31 am

:uarrow: They the experts so i happily eat crow.


EC probs 70-80% within 72hrs
https://i.imgsafe.org/d2ef5789b0.png
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Re: EPAC: INVEST 91E

#33 Postby cycloneye » Tue May 31, 2016 6:49 am

TROPICAL WEATHER OUTLOOK
NWS NATIONAL HURRICANE CENTER MIAMI FL
500 AM PDT TUE MAY 31 2016

For the eastern North Pacific...east of 140 degrees west longitude:

Showers and thunderstorms associated with an elongated area of low
pressure located nearly 1000 miles south of the southern tip of the
Baja California peninsula have changed little in organization since
yesterday. Environmental conditions are expected to be generally
conducive for gradual development, and a tropical depression is
still likely to form later this week as the disturbance moves
west-northwestward.
* Formation chance through 48 hours...low...10 percent
* Formation chance through 5 days...high...80 percent

$$
Forecaster Kimberlain
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Re: EPAC: INVEST 91E

#34 Postby NotoSans » Tue May 31, 2016 7:36 am

stormwise wrote:when bonnie was classified as a TD it was naked from shear, never said this is anything other than a TD.

A system needs to be devoid of deep convection for a period of time before being officially declared as post-tropical. Some storms may be naked but redevelop convection during diurnal maximum. That's why even though Bonnie was a naked swirl, NHC still kept it as a TD for a while. They waited until there was obviously no signs of redeveloping convection. But usually for upgrades, a system needs to exhibit persistent organized deep convection. Time is an important factor that need to be taken into account, and I honestly don't see any contradictions here.
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Re: EPAC: INVEST 91E

#35 Postby senorpepr » Tue May 31, 2016 8:33 am

The problem that I see is there isn't a well-defined circulation with 91E. As seen below in the 0511Z ASCAT pass, although there are westerly winds, the circulation remains elongated. Although not a requirement, based on precedence, the lack of winds at least 25 kts don't help the situation either. Give it a couple more days...

Image
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Re: EPAC: INVEST 91E

#36 Postby Yellow Evan » Tue May 31, 2016 10:32 am

Code: Select all

                    * EAST PACIFIC SHIPS INTENSITY FORECAST          *
                    * IR SAT DATA AVAILABLE,       OHC AVAILABLE     *
                    *  INVEST      EP912016  05/31/16  12 UTC        *

TIME (HR)          0     6    12    18    24    36    48    60    72    84    96   108   120
V (KT) NO LAND    20    22    24    26    29    39    49    58    63    64    66    67    67
V (KT) LAND       20    22    24    26    29    39    49    58    63    64    66    67    67
V (KT) LGEM       20    20    20    21    21    23    26    30    33    35    35    35    38
Storm Type      TROP  TROP  TROP  TROP  TROP  TROP  TROP  TROP  TROP  TROP  TROP  TROP  TROP

SHEAR (KT)        16    13     9     7     7     9     7     6     2     4     5     9     8
SHEAR ADJ (KT)    -4    -1     3     6     5     5     4     4     6     5     2    -2    -3
SHEAR DIR        112   109    89    70    67    74    39    54   291   296    33    49    82
SST (C)         29.5  29.4  29.5  29.5  29.6  29.8  29.8  29.8  29.6  29.4  29.4  29.5  29.4
POT. INT. (KT)   158   157   158   159   160   163   162   162   160   156   156   158   157
200 MB T (C)   -51.9 -51.9 -51.8 -52.4 -52.7 -52.4 -53.2 -52.5 -53.0 -52.6 -52.8 -52.6 -53.0
200 MB VXT (C)   0.0   0.0   0.0   0.1   0.0   0.0  -0.1  -0.1  -0.1  -0.1   0.0  -0.1   0.1
TH_E DEV (C)       6     7     7     7     7     7     7     7     6     6     6     7     7
700-500 MB RH     71    69    67    64    64    62    63    63    64    62    60    59    57
MODEL VTX (KT)     6     7     7     6     5     6     6     7     9    10    10    10    11
850 MB ENV VOR    34    34    30    21    11    17    27    32    24    31    33    45    38
200 MB DIV        40    55    80    94    91   113   109    65    28    -3    14    41    72
700-850 TADV       0    -1    -1    -1    -1     0     0    -1     0     0     0     0     0
LAND (KM)       1295  1315  1342  1397  1462  1619  1797  1969  2118  2215  2229  2143  2035
LAT (DEG N)      9.2   9.4   9.5   9.4   9.2   8.6   7.8   7.0   6.1   5.7   5.9   6.8   7.9
LONG(DEG W)    110.9 111.6 112.2 112.9 113.6 115.1 116.6 118.1 119.3 120.4 121.0 121.0 120.9
STM SPEED (KT)     6     7     6     7     7     9     8     8     7     4     3     5     6
HEAT CONTENT      67    73    79    84    83    55    28    23    22    23    24    23    27

  FORECAST TRACK FROM TABM      INITIAL HEADING/SPEED (DEG/KT):290/  4      CX,CY:  -3/  1
  T-12 MAX WIND:  20            PRESSURE OF STEERING LEVEL (MB):  539  (MEAN=586)
  GOES IR BRIGHTNESS TEMP. STD DEV.  50-200 KM RAD:  20.3 (MEAN=14.5)
  % GOES IR PIXELS WITH T < -20 C    50-200 KM RAD:  54.0 (MEAN=65.0)
  PRELIM RI PROB (DV .GE. 30 KT IN 24 HR):            6.1

                        INDIVIDUAL CONTRIBUTIONS TO INTENSITY CHANGE
                         6   12   18   24   36   48   60   72   84   96  108  120
                        ----------------------------------------------------------
  SAMPLE MEAN CHANGE     0.   0.   1.   1.   1.   1.   1.   1.   0.  -1.  -1.  -2.
  SST POTENTIAL          0.  -1.  -1.   0.   5.  14.  22.  29.  33.  35.  36.  37.
  VERTICAL SHEAR MAG     1.   1.   2.   2.   2.   3.   3.   5.   6.   8.   8.  10.
  VERTICAL SHEAR ADJ     0.   0.   0.  -1.  -1.  -2.  -2.  -2.  -2.  -1.  -1.  -1.
  VERTICAL SHEAR DIR     0.   1.   3.   4.   7.  10.  12.  11.   8.   8.   9.   9.
  PERSISTENCE            0.   0.   0.  -1.  -1.  -1.  -1.   0.   0.   0.   0.   1.
  200/250 MB TEMP.       0.   0.   0.   0.  -1.  -2.  -3.  -4.  -5.  -5.  -5.  -5.
  THETA_E EXCESS         0.   0.   0.   0.   0.   0.   1.   0.   0.   0.   0.   0.
  700-500 MB RH          0.   0.   0.   0.   0.   0.   0.   0.   1.   1.   1.   1.
  MODEL VTX TENDENCY     0.   1.   0.  -1.   0.   0.   2.   4.   6.   6.   5.   5.
  850 MB ENV VORTICITY   0.   0.   0.   0.   0.   0.   0.   0.   0.   0.   0.   0.
  200 MB DIVERGENCE      0.   0.   1.   1.   3.   4.   4.   4.   3.   2.   2.   1.
  850-700 T ADVEC        0.   0.   0.   0.   0.   0.   0.   0.   0.   0.   0.   0.
  ZONAL STORM MOTION     0.   0.  -1.  -1.  -1.  -2.  -2.  -2.  -1.  -1.  -1.  -1.
  STEERING LEVEL PRES    0.   0.   0.   0.   0.   0.   0.  -1.  -1.  -1.  -1.  -1.
  DAYS FROM CLIM. PEAK   0.   0.   0.   0.   0.   0.   0.  -1.  -1.  -2.  -2.  -2.
  GOES PREDICTORS        0.   0.   1.   1.   0.  -1.  -3.  -3.  -4.  -4.  -5.  -5.
  OCEAN HEAT CONTENT     0.   1.   2.   3.   4.   3.   2.   1.   1.   1.   1.   0.
                        ----------------------------------------------------------
  TOTAL CHANGE           2.   4.   6.   9.  19.  29.  38.  43.  44.  46.  47.  48.

                CURRENT MAX WIND (KT):   20. LAT, LON:    9.2   110.9

      ** 2015 E. Pacific RI INDEX EP912016 INVEST     05/31/16  12 UTC **
 (SHIPS-RII PREDICTOR TABLE for 30 KT OR MOREMAXIMUM WIND INCREASE IN NEXT 24-h)
 
     Predictor             Value   RI Predictor Range  Scaled Value(0-1) % Contribution
 12 HR PERSISTENCE (KT):     0.0     -22.0  to   38.5       0.36         999.0
 POT = MPI-VMAX (KT)   :   138.4      40.3  to  144.5       0.94         999.0
 HEAT CONTENT (KJ/cm2) :    77.2       0.0  to   75.9       1.00         999.0
 STD DEV OF IR BR TEMP :    20.3      38.9  to    2.1       0.51         999.0
 850-200 MB SHEAR (KT) :    10.4      18.9  to    1.4       0.49         999.0
 MAXIMUM WIND (kt)     :    20.0      22.5  to  132.0       0.00           0.0
 D200 (10**7s-1)       :    72.0     -11.0  to  135.3       0.57         999.0
 BL DRY-AIR FLUX (w/m2):    72.2     638.0  to  -68.2       0.80         999.0
 2nd PC OF IR BR TEMP  :    -0.9       2.1  to   -1.7       0.79         999.0
 % AREA WITH TPW <45 mm:     0.0      81.4  to    0.0       1.00         999.0
 
 SHIPS Prob RI for 20kt/ 12hr RI threshold=   0% is   0.0 times sample mean ( 6.3%)
 SHIPS Prob RI for 25kt/ 24hr RI threshold=   0% is   0.0 times sample mean (12.9%)
 SHIPS Prob RI for 30kt/ 24hr RI threshold=   0% is   0.0 times sample mean ( 8.6%)
 SHIPS Prob RI for 35kt/ 24hr RI threshold=   0% is   0.0 times sample mean ( 5.8%)
 SHIPS Prob RI for 40kt/ 24hr RI threshold=   0% is   0.0 times sample mean ( 4.1%)
 SHIPS Prob RI for 45kt/ 36hr RI threshold=   0% is   0.0 times sample mean ( 7.1%)
 SHIPS Prob RI for 55kt/ 48hr RI threshold=   0% is   0.0 times sample mean ( 5.9%)
 
 Matrix of RI probabilities
 ---------------------------------------------------------------------
  RI (kt / h)  | 20/12 | 25/24 | 30/24 | 35/24 | 40/24 | 45/36 | 55/48
 ---------------------------------------------------------------------
   SHIPS-RII:     0.0%    0.0%    0.0%    0.0%    0.0%    0.0%    0.0%
    Logistic:     2.6%   12.2%   13.9%    2.7%    1.3%   25.4%   19.0%
    Bayesian:     0.0%    6.7%    2.1%    0.2%    0.0%    0.1%    1.0%
   Consensus:     0.9%    6.3%    5.4%    0.9%    0.5%    8.5%    6.7%

   ##         ANNULAR HURRICANE INDEX (AHI) EP912016 INVEST     05/31/16  12 UTC         ##
   ## STORM NOT ANNULAR, SCREENING STEP FAILED, NPASS=5 NFAIL=2                          ##
   ## AHI=  0   (AHI OF 100 IS BEST FIT TO ANN. STRUC., 1 IS MARGINAL, 0 IS NOT ANNULAR) ##
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Re: EPAC: INVEST 91E

#37 Postby cycloneye » Tue May 31, 2016 11:13 am

12z GFS is more stronger.

Image
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Re: EPAC: INVEST 91E

#38 Postby cycloneye » Tue May 31, 2016 12:43 pm

A slow process.

TROPICAL WEATHER OUTLOOK
NWS NATIONAL HURRICANE CENTER MIAMI FL
1100 AM PDT TUE MAY 31 2016

For the eastern North Pacific...east of 140 degrees west longitude:

Showers and thunderstorms associated with an elongated area of low
pressure located about 1000 miles south of the southern tip of the
Baja California peninsula have become less organized since
yesterday.
However, environmental conditions are expected to
be conducive for slow development, and a tropical depression is
still likely to form later this week as the disturbance moves
slowly west-northwestward.
* Formation chance through 48 hours...low...10 percent
* Formation chance through 5 days...high...80 percent

$$
Forecaster Kimberlain
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Re: EPAC: INVEST 91E

#39 Postby Yellow Evan » Tue May 31, 2016 1:30 pm

Seems to have become less organized which is typical for these kind of systems.

Regardless ECMWF, GFS, GFDL, and HWRF show this spinning up by the end of the week.
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Re: EPAC: INVEST 91E

#40 Postby Kingarabian » Tue May 31, 2016 1:50 pm

GFS keeps it weak for another 36 hours before consolidating.
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