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Eastern Pacific Tropical Weather Discussion



000
AXPZ20 KNHC 172106 CCA
TWDEP 

TROPICAL WEATHER DISCUSSION                                   
NWS NATIONAL HURRICANE CENTER MIAMI FL                        
2205 UTC WED SEP 17 2014

TROPICAL WEATHER DISCUSSION FOR THE EASTERN PACIFIC OCEAN FROM 
THE EQUATOR TO 32N...EAST OF 140W. THE FOLLOWING INFORMATION IS 
BASED ON SATELLITE IMAGERY...WEATHER OBSERVATIONS...RADAR...AND 
METEOROLOGICAL ANALYSIS.

BASED ON 1800 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY THROUGH 
2030 UTC.

...SPECIAL FEATURES... 

TROPICAL STORM POLO IS CENTERED NEAR 16.4N 103.7W AT 17/2100 UTC 
OR ABOUT ABOUT 160 NM S-SE OF MANZANILLO MEXICO AND ABOUT 145 NM 
SW OF ZIHUATANEJO MEXICO MOVING NW AT 10 KT. ESTIMATED CENTRAL 
PRESSURE IS 991 MB. MAXIMUM SUSTAINED WIND SPEED IS 60 KT WITH 
GUSTS 75 KT. NUMEROUS MODERATE TO SCATTERED STRONG CONVECTION IS 
FROM 14N-18N BETWEEN 101W-105W. SCATTERED MODERATE TO ISOLATED 
STRONG CONVECTION IS FROM 11N-18N BETWEEN 100W-110W. POLO IS 
EXPECTED TO INTENSIFY AS IT MOVES PARALLEL TO THE SW COAST OF 
MEXICO BECOMING A HURRICANE TONIGHT OR THURSDAY. THERE IS AGAIN A 
POTENTIAL FOR FLASH FLOODS AND MUDSLIDES IN AREAS PREVIOUSLY 
AFFECTED BY NORBERT AND ODILE. SEE THE LATEST INTERMEDIATE 
PUBLIC ADVISORY UNDER AWIPS/WMO HEADERS MIATCPEP2/WTPZ32 KNHC 
AND FORECAST/ ADVISORY UNDER HEADERS MIATCMEP2/WTPZ22 KNHC FOR 
MORE DETAILS. 

TROPICAL STORM ODILE WAS DOWNGRADED TO TROPICAL DEPRESSION AT 
17/1800 UTC AND TO A REMNANT LOW AT 17/2100 UTC. REMNANT LOW OF 
ODILE IS CENTERED NEAR 31.1N 112.7W AT 17/2100 UTC OR ABOUT 17 
NM W OF CABORCA MEXICO AND ABOUT 110 NM SW OF TUCSON ARIZONA 
MOVING NE AT 6 KT. ESTIMATED CENTRAL PRESSURE IS 1004 MB. 
MAXIMUM SUSTAINED WIND SPEED IS 25 KT WITH GUSTS TO 35 KT. THIS 
IS THE LAST ADVISORY ISSUED BY THE NATIONAL HURRICANE CENTER. 

...INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH...

THE MONSOON TROUGH EXTENDS FROM 7N78W ALONG 7N84W 12N93W TO 
14N99W THEN RESUMES SW OF T.S. POLO NEAR 14N105W 12N110W TO 
10N123W WHERE THE ITCZ CONTINUES ALONG 9N128W TO 13N140W. 
SCATTERED MODERATE TO ISOLATED STRONG FROM 5N-8N BETWEEN 79W-
87W...FROM 7N-10N BETWEEN 95W-98W...AND FROM 10N-13N BETWEEN 
110W-114W. 

...DISCUSSION...

A WEAKENING COLD FRONT EXTENDS THROUGH 32N127W TO 30N129W WHERE 
IT DISSIPATES TO 23N140W. NW SWELL BEHIND THE FRONT IS 
MAINTAINING SEAS TO 8-10 FT AS IT MIXES WITH BROAD CROSS-
EQUATORIAL SW SWELL ACROSS THE AREA. THE FRONT WILL WEAKEN 
TONIGHT AND THU WITH SEAS SUBSIDING BELOW 8 FT THU AFTERNOON.

A WEAK SURFACE RIDGE OVER THE NW AND NORTH-CENTRAL WATERS W OF 
120W IS MAINTAINING GENTLE TO MODERATE TRADES N OF THE 
CONVERGENCE ZONE.

AFTER A SUSTAINED PERIOD OF ACTIVE TROPICAL CYCLONE ACTIVITY AND 
CLYCLOGENEIS ASSOCIATED WITH ENHANCED W-SW FLOW SOUTH OF THE 
MONSOON TROUGH THE PAST WEEK OR TWO...THE OUTLOOK FOR THE NEXT 
FEW DAYS...BASED ON MODEL GUIDANCE...SHOWS A MARKED DECREASE IN 
ACTIVITY OTHER THAN IN THE IMMEDIATE VICINITY OF T.S. POLO.

$$ 
PAW



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Page last modified: Wednesday, 17-Sep-2014 21:06:10 UTC