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Eastern Pacific Tropical Weather Discussion (Text)



000
AXPZ20 KNHC 020938
TWDEP 

TROPICAL WEATHER DISCUSSION                                      
NWS NATIONAL HURRICANE CENTER MIAMI FL                         
1005 UTC THU OCT 2 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 0600 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY THROUGH 
0900 UTC.

...SPECIAL FEATURES...                                          
RECENTLY NAMED TROPICAL STORM SIMON NEAR 18.1N 106.1W 1002 MB AT 
0900 UTC OCT 02 MOVING WNW OR 295 DEG AT 9 KT. MAXIMUM SUSTAINED 
WINDS 35 KT GUSTS 45 KT. SCATTERED MODERATE ISOLATED STRONG 
CONVECTION WITHIN 90 NM OF THE CENTER. SIMON IS EXPECTED TO 
INTENSIFY THROUGH LATE FRI AS IT MOVES W-NW OVER WARMER WATER IN 
A MOIST LOW SHEAR ENVIRONMENT. SEE LATEST NHC FORECAST/ADVISORY 
UNDER AWIPS/WMO HEADERS MIATCMEP4/WTPZ24 KNHC FOR MORE DETAILS.

...INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH...           
THE MONSOON TROUGH EXTENDS FROM 10N85W TO 09N91W TO 11N99W THEN 
RESUMES FROM 13N110W TO 11N123W TO 12N131W TO 10N140W. SCATTERED 
MODERATE CONVECTION WITHIN 75 NM EITHER SIDE OF THE TROUGH AXIS 
E OF 90W. SCATTERED MODERATE ISOLATED STRONG CONVECTION FROM 09N 
TO 13N BETWEEN 98W AND 101W. SCATTERED MODERATE CONVECTION IS 
WITHIN 75 NM S OF THE TROUGH BETWEEN 108W AND 127W.

...DISCUSSION...                                             
WIND WAVES ASSOCIATED WITH A SUSTAINED FRESH S TO SW MONSOONAL 
FLOW S OF TROPICAL STORM SIMON ARE COMBINING WITH RESIDUAL LONG 
PERIOD CROSS-EQUATORIAL SW SWELL ACROSS THE REGION TO PRODUCE A 
LARGE AREA OF 8-9 FT SEAS ROUGHLY FROM 06N TO 13N BETWEEN 101W 
AND 119W. AS SIMON TRACKS W-NW...THE AREA OF MONSOONAL FLOW WILL 
SHIFT N-NE AND DECREASE IN AREAL COVERAGE THROUGH LATE FRIDAY.

WATER VAPOR IMAGERY SHOWS A POSITIVELY TILTED MIDDLE TO UPPER 
LEVEL TROUGH OVER THE U.S. INTERMOUNTAIN WEST EXTENDING ACROSS 
SOUTHERN ARIZONA TO SONORA STATE IN MEXICO. RESIDUAL N-NW SWELL 
FROM STRONG TO NEAR GALE WINDS W OF NORTHERN CALIFORNIA IS 
SUPPORTING 8-9 FT SEAS N OF 28N BETWEEN 120W AND 132W. SEAS ARE 
EXPECTED TO SUBSIDE BELOW ADVISORY CRITERIA BY LATE TONIGHT.

NW WINDS WILL INCREASE TO 20-25 KT N OF 25N THURSDAY IN THE GULF 
OF CALIFORNIA AS HIGH PRESSURE BUILDS E ACROSS NORTHERN WATERS 
AND THE PRESSURE GRADIENT STRENGTHENS.

$$
MUNDELL

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Page last modified: Thursday, 02-Oct-2014 09:39:08 UTC