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Tropical Storm POLO Forecast Discussion Number 22

2014-09-21 16:38:44| National Hurricane Center (East Pacific)

Issued at 800 AM PDT SUN SEP 21 2014 000 WTPZ42 KNHC 211438 TCDEP2 TROPICAL STORM POLO DISCUSSION NUMBER 22 NWS NATIONAL HURRICANE CENTER MIAMI FL EP172014 800 AM PDT SUN SEP 21 2014 Polo is not in good shape. Strong easterly shear continues to affect the cyclone, keeping the low-level center exposed to the east of the nearest deep convection. The system has been producing somewhat regular bursts of deep convection over the past couple of days, with the latest burst currently on the increase. The initial intensity is being held at 35 kt for this advisory in agreement with the 1200 UTC TAFB Dvorak intensity estimate. With no cessation of the strong shear seen in the short term, further weakening seems likely to occur. However, Polo will be moving over warm enough water to sustain additional bursts of convection, and thermodynamic variables will only gradually become less conducive. The NHC intensity forecast, like the previous one, shows slow weakening but maintains the system as a tropical cyclone longer. The new forecast is just above the latest intensity guidance and shows dissipation in about 3 days in line with global model output. Polo is moving slowly west-northwestward or 290/06 kt. A continued west-northwestward and then westward track is expected during the next day or so as a result of a westward building mid-level ridge over northern Mexico. Once Polo becomes shallower in nature, a bend of the track toward the southwest and south-southwest is indicated as the cyclone is pushed by a north-northeasterly flow on the eastern side of a low-level ridge. The new track forecast does not depart significantly from the previous one but is shifted slightly to the right in the direction of the well-performing multi-model consensus, TVCE. FORECAST POSITIONS AND MAX WINDS INIT 21/1500Z 21.9N 111.2W 35 KT 40 MPH 12H 22/0000Z 22.2N 112.4W 30 KT 35 MPH 24H 22/1200Z 22.2N 113.8W 30 KT 35 MPH 36H 23/0000Z 21.9N 114.8W 25 KT 30 MPH...POST-TROP/REMNT LOW 48H 23/1200Z 21.4N 115.6W 25 KT 30 MPH...POST-TROP/REMNT LOW 72H 24/1200Z 20.1N 116.5W 20 KT 25 MPH...POST-TROP/REMNT LOW 96H 25/1200Z...DISSIPATED $$ Forecaster Kimberlain

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Tropical Storm POLO Graphics

2014-09-21 16:38:22| Tropical Depression LIDIA

5-Day Uncertainty Track last updated Sun, 21 Sep 2014 14:38:14 GMT Wind Speed Probabilities last updated Sun, 21 Sep 2014 14:37:47 GMT

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Summary for Tropical Storm POLO (EP2/EP172014)

2014-09-21 16:37:40| Tropical Depression LIDIA

...POLO REMAINS A WEAK TROPICAL STORM... ...MOVING FARTHER AWAY FROM THE SOUTHERN BAJA PENINSULA... As of 8:00 AM PDT Sun Sep 21 the center of POLO was located near 21.9, -111.2 with movement WNW at 8 mph. The minimum central pressure was 1004 mb with maximum sustained winds of about 40 mph.

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Tropical Storm POLO Public Advisory Number 22

2014-09-21 16:37:40| Tropical Depression LIDIA

...POLO REMAINS A WEAK TROPICAL STORM... ...MOVING FARTHER AWAY FROM THE SOUTHERN BAJA PENINSULA... Location: 21.9°N 111.2°W Max sustained: 40 mph Moving: WNW at 8 mph Min pressure: 1004 mb Issued at 800 AM PDT SUN SEP 21 2014

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