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Eastern Pacific Tropical Weather Discussion



000
AXPZ20 KNHC 280308
TWDEP 

TROPICAL WEATHER DISCUSSION                                    
NWS NATIONAL HURRICANE CENTER MIAMI FL                         
0405 UTC SUN DEC 28 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 
0300 UTC. 

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

THE MONSOON TROUGH EXTENDS FROM 10N85W TO 07N94W WHERE LOW LEVEL 
WINDS SUGGEST A TRANSITION TO ITCZ WHICH EXTENDS TO 07N104W TO 
05N114W TO 07.5N127W TO 06N140W. SCATTERED MODERATE ISOLATED 
STRONG WITHIN 120 NM N OF ITCZ BETWEEN 94W AND 104W. SCATTERED 
MODERATE ISOLATED STRONG WITHIN 390 NM N OF ITCZ BETWEEN 104W 
AND 109W. 

...DISCUSSION...                                                 

A WEAK RIDGE OF HIGH PRESSURE EXTENDS ACROSS THE FAR NW WATERS. 
STRONG LOW PRESSURE IS CENTERED NW OF THE AREA NEAR 36N154W. THE 
PRESSURE GRADIENT BETWEEN THE RIDGE OF HIGH PRESSURE AND THE 
AREA OF LOW PRESSURE IS SUPPORTING FRESH TO NEAR GALE SE WINDS 
OVER THE NW WATERS WITH SEAS REACHING 11 FT. THE PRESSURE 
GRADIENT BETWEEN THE RIDGE AND LOWER PRESSURE IN THE VICINITY OF 
THE ITCZ IS MAINTAINING FRESH TRADES OVER THE WESTERN WATERS N 
OF THE ITCZ. WINDS TO NEAR GALE FORCE WILL CONTINUE OVER THE FAR 
NW WATERS THROUGH MON EVENING WITH SEAS BUILDING TO NEAR 13 FT. 

GULF OF PAPAGAYO...WINDS WILL PULSE TO FRESH TO STRONG DURING 
THE LATE NIGHT AND EARLY MORNING HOURS OVER THE NEXT COUPLE OF 
DAYS. 

GULF OF CALIFORNIA...HIGH PRES OVER THE GREAT BASIN REGION IS 
MAINTAINING A TIGHT PRESSURE GRADIENT OVER THE GULF OF 
CALIFORNIA TO SUPPORT FRESH TO STRONG NW WINDS. THE AREA OF HIGH 
PRESSURE OVER THE GREAT BASIN REGION WILL WEAKEN OVER THE NEXT 
24 HOURS. THIS WILL DIMINISH WINDS OVER THE GULF OF 
CALIFORNIA...TO 20 KT OR LESS...BY SUN AFTERNOON. 

GULF OF TEHUANTEPEC...A COLD FRONT OVER THE NW GULF OF MEXICO 
WILL CONTINUE TO MOVE SE OVER THE GULF OF MEXICO. THE FRONT WILL 
REACH THE BAY OF CAMPECHE SUN NIGHT. COOL DENSE AIR WILL START 
TO FUNNEL THROUGH THE CHIVELA PASS LATE SUN NIGHT. THIS WILL 
HELP FOR WINDS OVER THE GULF OF TEHUANTEPEC TO INCREASE TO 25 KT 
BY 06 UTC MON. WINDS WILL FURTHER INCREASE BRIEFLY TO NEAR GALE 
FORCE EARLY MON BEFORE DIMINISHING TO 25 KT BY MON AFTERNOON. 

$$
AL



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Page last modified: Sunday, 28-Dec-2014 03:12:31 UTC