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Eastern Pacific Tropical Weather Discussion



000
AXPZ20 KNHC 220221
TWDEP 

TROPICAL WEATHER DISCUSSION                                      
NWS NATIONAL HURRICANE CENTER MIAMI FL                         
0405 UTC WED OCT 22 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 0000 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY THROUGH 
0245 UTC.                       

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

MONSOON TROUGH AXIS EXTENDS FROM 08N78W TO 09N81W TO LOW PRES 
NEAR 08N87W 1008 MB TO LOW PRES NEAR 15N95W 1006 MB TO 16N100W 
TO 11N110W TO 10N135W THEN TRANSITIONS TO ITCZ TO BEYOND 
08N140W. SCATTERED MODERATE CONVECTION FROM 05N TO 08N BETWEEN 
85W AND 95W. SCATTERED MODERATE CONVECTION WITHIN 240 NM N AND 
120 NM S OF OF ITCZ AXIS W OF 130W.  

...DISCUSSION...

LIGHT TO MODERATE SW FLOW IS NOTED ACROSS THE TROPICAL EASTERN 
PACIFIC INTO THE COAST OF CENTRAL AMERICA AND SOUTHERN MEXICO. 
THE MONSOON TROUGH IS NOT ANALYZED OVER ITS USUAL AREA IN THE 
TROPICAL EASTERN PACIFIC...BUT INSTEAD EXTENDS FROM THE 
CARIBBEAN COAST OF COLOMBIA...ACROSS THE FAR SW 
CARIBBEAN...THROUGH NICARAGUA AND HONDURAS AND INTO LOW PRES 
OVER EASTERN GUATEMALA. THE CONVERGENT SW WINDS ALONG WITH RICH 
DEEP LAYER MOISTURE ARE MAINTAINING POCKETS OF SHOWERS AND 
THUNDERSTORMS ACROSS THE REGION N OF 05N AND W OF 100W.

FOR THE GULF OF TEHUANTEPEC...WINDS REMAIN FAIRLY LIGHT OUTSIDE 
OF ANY GUSTS RELATED TO THE SHOWERS AND THUNDERSTORMS...DUE 
LARGE TO THE VERY WEAK PRES GRADIENT IN PLACE BETWEEN ON EITHER 
SIDE OF THE ISTHMUS. THIS WILL CHANGE BY LATE THU...AS THE LOW 
IN THE GULF OF MEXICO DEEPENS AND SHIFTS EASTWARD AND HIGH PRES 
BUILDS OVER THE FAR WESTERN GULF IN ITS WAKE. EXPECT STRONG GAP 
WINDS INTO THE GULF OF TEHUANTEPEC THU INTO FRI MORNING AS A 
RESULT. 

FARTHER WEST...AN UPPER CYCLONE CENTERED NEAR 13N140W IS 
SUPPORTING SCATTERED CONVECTION ALONG THE ITCZ FROM ROUGHLY 07N 
TO 15N W OF 130W. THIS AREA MAY PERSIST THROUGH THU...THEN 
DIMINISH AS THE LOW PRES LIFTS NORTH.

ELSEWHERE...A 1024 MB RIDGE CENTERED NEAR 31N140W IS MAINTAINING 
MODERATE TO FRESH TRADE WINDS SOUTH OF 20N W OF 120W. OTHERWISE 
THE MAIN ISSUE IS NW SWELL OF 8 TO 13 FT NW OF A LINE FROM 
29N115W TO 12N130W TO 10N140W. THE SWELL WILL EXPAND ACROSS MUCH 
OF THE AREA W OF 110W OVER THE NEXT 24 TO 36 HOURS...BUT DECAY 
BELOW 8 FT THROUGH 48 HOURS OVER MOST OF THE REGION. A SECOND 
AREA OF NW SWELL IN EXCESS OF 8 FT WILL START TO MOVE SOUTH OF 
30N BY LATE THU.

$$
CHRISTENSEN



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Page last modified: Wednesday, 22-Oct-2014 02:21:33 UTC