EPAC: POLO - Post-Tropical

[cycloneye]

00z Best Track upgrades to Hurricane.

EP, 17, 2014091800, , BEST, 0, 163N, 1043W, 65, 988, HU, 34, NEQ, 70, 70, 60, 60, 1008, 150, 15, 0, 0, E, 0, , 0, 0, POLO, D,
EP, 17, 2014091800, , BEST, 0, 163N, 1043W, 65, 988, HU, 50, NEQ, 30, 30, 20, 20, 1008, 150, 15, 0, 0, E, 0, , 0, 0, POLO, D,
EP, 17, 2014091800, , BEST, 0, 163N, 1043W, 65, 988, HU, 64, NEQ, 15, 15, 10, 10, 1008, 150, 15, 0, 0, E, 0, , 0, 0, POLO, D,

[xtyphooncyclonex]

Numero doce

17E POLO 140918 0000 16.3N 104.3W EPAC 65 988

[HurricaneBelle]

Polo cannot cause serious damage and get retired. We need to keep the possibility alive of having Marco and Polo active at the same time.

The problem is that they're both considered male names and are the 13th and 16th letters of the alphabet, so with one even and one odd they'll never be part of same year's list of names.

[xtyphooncyclonex]

Polo cannot cause serious damage and get retired. We need to keep the possibility alive of having Marco and Polo active at the same time.

The problem is that they're both considered male names and are the 13th and 16th letters of the alphabet, so with one even and one odd they'll never be part of same year's list of names.

It can if the Atlantic were active enough. Remember ATL and EPAC have different lists used in a year. Marco is part of this year's hurricane list in the ATL and Polo in the EPAC. Also that the first name in the EPac was Amanda and it was Arthur in the ATL

[Yellow Evan]

Polo cannot cause serious damage and get retired. We need to keep the possibility alive of having Marco and Polo active at the same time.

That honestly should not be too hard.

[cycloneye]

BULLETIN
HURRICANE POLO ADVISORY NUMBER 8
NWS NATIONAL HURRICANE CENTER MIAMI FL EP172014
800 PM PDT WED SEP 17 2014

...POLO BECOMES A HURRICANE...


SUMMARY OF 800 PM PDT...0300 UTC...INFORMATION
----------------------------------------------
LOCATION...16.4N 104.6W
ABOUT 180 MI...290 KM S OF MANZANILLO MEXICO
MAXIMUM SUSTAINED WINDS...75 MPH...120 KM/H
PRESENT MOVEMENT...WNW OR 300 DEGREES AT 10 MPH...17 KM/H
MINIMUM CENTRAL PRESSURE...988 MB...29.18 INCHES



HURRICANE POLO DISCUSSION NUMBER 8
NWS NATIONAL HURRICANE CENTER MIAMI FL EP172014
800 PM PDT WED SEP 17 2014

The tropical cyclone's cloud pattern is gradually becoming better
organized, with increased convective banding. Subjective Dvorak
satellite intensity estimates from TAFB and SAB as well as objective
estimates from CIMSS are a consensus 65 kt. Therefore Polo is being
upgraded, and it becomes the eleventh hurricane of this active
eastern North Pacific season. There is moderate northeasterly shear
over the system, but the shear is not expected to be strong enough
to prevent some additional intensification over the next 24 hours
or so. Later in the forecast period, a somewhat drier and more
stable air mass is expected to cause slow weakening. The official
intensity forecast is close to the latest Decay-SHIPS model
guidance, and is similar to the previous NHC wind speed forecast.

Based on recent center fixes, Polo is located slightly to the south
of the previous track, and the initial motion is west-northwestward,
or 300/9 kt. A mid-tropospheric ridge extending westward from
northwestern mainland Mexico across the Baja California peninsula
should cause the tropical cyclone to move on a west-northwestward or
northwestward heading for the next several days. The official track
forecast has been shifted slightly south of the previous one, mainly
due to the more southward position of Polo at this time. The
current NHC track prediction lies quite close to the GFS/ECMWF
consensus and the Florida State University Superensemble.

FORECAST POSITIONS AND MAX WINDS

INIT 18/0300Z 16.4N 104.6W 65 KT 75 MPH
12H 18/1200Z 17.1N 105.7W 70 KT 80 MPH
24H 19/0000Z 17.7N 106.7W 80 KT 90 MPH
36H 19/1200Z 18.4N 107.7W 80 KT 90 MPH
48H 20/0000Z 19.2N 108.8W 75 KT 85 MPH
72H 21/0000Z 20.6N 111.2W 65 KT 75 MPH
96H 22/0000Z 21.6N 113.5W 55 KT 65 MPH
120H 23/0000Z 22.0N 115.5W 45 KT 50 MPH

$$
Forecaster Pasch

[TropicalAnalystwx13]

Big structural changes in the past hour or two.

[Socalsgrl]

Looks like a strong center.

[cycloneye]

HURRICANE POLO DISCUSSION NUMBER 9
NWS NATIONAL HURRICANE CENTER MIAMI FL EP172014
200 AM PDT THU SEP 18 2014

Polo has changed little in organization during the past several
hours. Satellite imagery indicates a small central convective
feature, with an area of outer banding over the southeastern
semicircle. Satellite intensity estimates from TAFB and SAB remain
65 kt, and that is the initial intensity.

The initial motion is 300/7. A mid-tropospheric ridge extending
westward from northwestern mainland Mexico across the Baja
California peninsula should cause the tropical cyclone to move on a
west-northwestward or northwestward heading for the next several
days. While the overall track forecast philosophy is unchanged, the
latest track guidance has shifted to the north since the previous
advisory due mainly to forecasts of a northwestward motion during
the first 24-48 hours. The new forecast track lies parallel to but
a little north of the previous track in best agreement with the GFS
and ECMWF models. However, the new track is south of the center of
the guidance envelope, as well as south of the consensus model TVCE.

Analyses from CIMSS at the University of Wisconsin show that
northeasterly vertical wind shear is increasing over Polo. The
large-scale models forecast this to continue, with the shear
becoming quite strong after 24 hours. The intensity guidance
responds to these developments by forecasting Polo to be weaker
than the guidance of 6 hours ago. The intensity forecast follows
the trend of the previous forecast, with a little strengthening
during the first 24 hours followed by weakening as Polo encounters
the stronger shear and cooler water. However, the forecast
intensities are lowered from 24-120 hours. It should be noted that
the new forecast is at the upper-level edge of the intensity
guidance, and an alternative forecast scenario is that Polo does not
strengthen any more before the shear causes it to weaken.


FORECAST POSITIONS AND MAX WINDS

INIT 18/0900Z 16.7N 105.0W 65 KT 75 MPH
12H 18/1800Z 17.4N 105.8W 70 KT 80 MPH
24H 19/0600Z 18.2N 106.8W 75 KT 85 MPH
36H 19/1800Z 18.9N 107.8W 75 KT 85 MPH
48H 20/0600Z 19.6N 108.8W 70 KT 80 MPH
72H 21/0600Z 21.0N 111.0W 60 KT 70 MPH
96H 22/0600Z 22.0N 113.0W 50 KT 60 MPH
120H 23/0600Z 22.5N 115.0W 40 KT 45 MPH

$$
Forecaster Beven

[hurricanes1234]

Shear! Shear could possibly prevent this from intensifying further.

000
WTPZ32 KNHC 180849
TCPEP2

BULLETIN
HURRICANE POLO ADVISORY NUMBER 9
NWS NATIONAL HURRICANE CENTER MIAMI FL EP172014
200 AM PDT THU SEP 18 2014

...POLO CHANGES LITTLE IN STRENGTH DURING THE PAST SEVERAL HOURS...


SUMMARY OF 200 AM PDT...0900 UTC...INFORMATION
----------------------------------------------
LOCATION...16.7N 105.0W
ABOUT 165 MI...265 KM SSW OF MANZANILLO MEXICO
ABOUT 535 MI...860 KM SE OF THE SOUTHERN TIP OF BAJA CALIFORNIA
MAXIMUM SUSTAINED WINDS...75 MPH...120 KM/H
PRESENT MOVEMENT...WNW OR 300 DEGREES AT 8 MPH...13 KM/H
MINIMUM CENTRAL PRESSURE...988 MB...29.18 INCHES

[hurricanes1234]

I think the shear might prevent any further intensification. Just like Karina when it first became a hurricane, except that I am not sure if Polo will linger around like that.

[Yellow Evan]

Shear! Shear could possibly prevent this from intensifying further.

Don't be so pessimistic. This also happened to Norbert. Any relaxation in shear will lead to RI.

[Yellow Evan]

ADT lagging, but increasing

UW - CIMSS
ADVANCED DVORAK TECHNIQUE
ADT-Version 8.2.1
Tropical Cyclone Intensity Algorithm

----- Current Analysis -----
Date : 18 SEP 2014 Time : 111500 UTC
Lat : 16:52:06 N Lon : 105:12:39 W


CI# /Pressure/ Vmax
3.3 / 995.4mb/ 51.0kt


Final T# Adj T# Raw T#
3.2 3.5 3.5

Center Temp : -65.0C Cloud Region Temp : -57.6C

Scene Type : UNIFORM CDO CLOUD REGION

Positioning Method : FORECAST INTERPOLATION

Ocean Basin : EAST PACIFIC
Dvorak CI > MSLP Conversion Used : ATLANTIC

Tno/CI Rules : Constraint Limits : NO LIMIT
Weakening Flag : ON
Rapid Dissipation Flag : OFF

C/K/Z MSLP Estimate Inputs :
- Average 34 knot radii : 65km
- Environmental MSLP : 1010mb

Satellite Name : GOES13
Satellite Viewing Angle : 39.7 degrees

[xtyphooncyclonex]

Hurricanes1234, THIS IS NOT 2013.

[Yellow Evan]

Let's not get too out of hand and rude. If this was a normal season, I would agree with him.

EP, 17, 2014091812, , BEST, 0, 170N, 1053W, 65, 988, HU, 34, NEQ, 70, 70, 60, 60, 1008, 150, 15, 0, 0, E, 0, , 0, 0, POLO, D,
EP, 17, 2014091812, , BEST, 0, 170N, 1053W, 65, 988, HU, 50, NEQ, 30, 30, 20, 20, 1008, 150, 15, 0, 0, E, 0, , 0, 0, POLO, D,
EP, 17, 2014091812, , BEST, 0, 170N, 1053W, 65, 988, HU, 64, NEQ, 15, 15, 10, 10, 1008, 150, 15, 0, 0, E, 0, , 0, 0, POLO, D,

SAB and TAFB are still 4.0/65 knts.

[xtyphooncyclonex]

I partly agree with hurricanes1234 that Hurricane Polo appears to be grotesque and disorganized. Shear may hinder the rate of intensification over the next few days, based on the official forecasts from the NHC. However, there is a possibility of a Rapid Intensification scenario like Norbert.

[Yellow Evan]

I partly agree with hurricanes1234 that Hurricane Polo appears to be grotesque and disorganized. Shear may hinder the rate of intensification over the next few days, based on the official forecasts from the NHC. However, there is a possibility of a Rapid Intensification scenario like Norbert.

I do too. The NHC thinks cold SST's will be an issue but the track is further south and west of Baja, there are an area of warm SST's and very low shear.

[supercane4867]

Polo looks fairly organized for a storm that's already under 20kt of shear

[cycloneye]

BULLETIN
HURRICANE POLO ADVISORY NUMBER 10
NWS NATIONAL HURRICANE CENTER MIAMI FL EP172014
800 AM PDT THU SEP 18 2014

...POLO REMAINS WITH 75 MPH WINDS...
...HURRICANE HUNTER AIRCRAFT ON ITS WAY TO POLO...


SUMMARY OF 800 AM PDT...1500 UTC...INFORMATION
----------------------------------------------
LOCATION...17.3N 105.7W
ABOUT 150 MI...240 KM SW OF MANZANILLO MEXICO
ABOUT 475 MI...760 KM SE OF THE SOUTHERN TIP OF BAJA CALIFORNIA
MAXIMUM SUSTAINED WINDS...75 MPH...120 KM/H
PRESENT MOVEMENT...NW OR 310 DEGREES AT 8 MPH...13 KM/H
MINIMUM CENTRAL PRESSURE...988 MB...29.18 INCHES





HURRICANE POLO DISCUSSION NUMBER 10
NWS NATIONAL HURRICANE CENTER MIAMI FL EP172014
800 AM PDT THU SEP 18 2014

The cloud pattern associated with Polo has not become any better
organized during the past several hours. There is a small central
dense overcast surrounded by a cyclonically curved convective band.
The initial intensity is kept at 65 kt based on Dvorak estimates
from TAFB and SAB. Polo has the opportunity to strengthen before the
northeasterly shear increases in 24 hours as indicated in the NHC
forecast. After that time, most of the guidance shows gradual
weakening, and in fact, the peak wind indicated by the intensity
consensus and the SHIPS models is lower than in previous runs.
Cooler waters from the upwelling caused by Odile will likely aid the
weakening process.

The best estimate of the initial motion is 310/7. A strong ridge
of high pressure over Mexico is driving Polo west-northwestward and
northwestward. Most of the global models amplify the ridge, and this
pattern will continue to steer Polo on the same general track for
the next 3 to 4 days. On the forecast track, the cyclone will pass
well south of the southwestern coast of Mexico and well south of the
southern Baja California peninsula. The confidence in the track
forecast is relatively high since both the multi-model consensus
TVCN and the average of the GFS and the ECMWF models, GFEX, are
predicting a track well removed from land. By the end of the
forecast period, a weaker Polo will probably meander embedded within
the low-level flow, well away from land.


FORECAST POSITIONS AND MAX WINDS

INIT 18/1500Z 17.3N 105.7W 65 KT 75 MPH
12H 19/0000Z 18.0N 106.4W 70 KT 80 MPH
24H 19/1200Z 18.7N 107.5W 70 KT 80 MPH
36H 20/0000Z 19.5N 108.5W 65 KT 75 MPH
48H 20/1200Z 20.4N 109.7W 65 KT 75 MPH
72H 21/1200Z 21.5N 112.0W 55 KT 65 MPH
96H 22/1200Z 22.5N 114.0W 45 KT 50 MPH
120H 23/1200Z 22.5N 116.0W 35 KT 40 MPH

$$
Forecaster Avila

[cycloneye]

BULLETIN
HURRICANE POLO INTERMEDIATE ADVISORY NUMBER 10A
NWS NATIONAL HURRICANE CENTER MIAMI FL EP172014
1100 AM PDT THU SEP 18 2014

...HURRICANE HUNTER AIRCRAFT APPROACHING POLO...


SUMMARY OF 1100 AM PDT...1800 UTC...INFORMATION
-----------------------------------------------
LOCATION...17.4N 105.8W
ABOUT 145 MI...235 KM SW OF MANZANILLO MEXICO
ABOUT 465 MI...745 KM SE OF THE SOUTHERN TIP OF BAJA CALIFORNIA
MAXIMUM SUSTAINED WINDS...75 MPH...120 KM/H
PRESENT MOVEMENT...NW OR 310 DEGREES AT 8 MPH...13 KM/H
MINIMUM CENTRAL PRESSURE...988 MB...29.18 INCHES