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Eastern Pacific Tropical Weather Discussion



000
AXPZ20 KNHC 021542
TWDEP 

TROPICAL WEATHER DISCUSSION                                     
NWS NATIONAL HURRICANE CENTER MIAMI FL                         
1605 UTC MON MAR 2 2015

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 1200 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY THROUGH 
1500 UTC. 

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

SURFACE TROUGH FROM 04N80W TO 04N91W. ITCZ EXTENDS FROM 04N91W 
TO 08N127W TO 06N140W. NO SIGNIFICANT CONVECTION.

A SURFACE TROUGH EXTENDS FROM 21N116W TO 114N124W. SCATTERED 
MODERATE CONVECTION WITHIN 90 NM EITHER SIDE OF TROUGH AXIS.

...DISCUSSION... 

A MID-LEVEL TROUGH EXTENDS FROM 34N120W TO 18N132W. THE TROUGH 
SUPPORTS A COLD FRONT EXTENDING INTO THE TROPICS FROM 30N113W TO 
21N123W. SCATTEROMETER DATA SHOWED SMALL AREA OF FRESH TO STRONG 
WINDS CENTERED NEAR 22N134W. MODEL GUIDANCE INDICATES REGION OF 
ENHANCED TRADES WILL SHIFT W-SW BEYOND 140W THROUGH TUE. 1033 MB 
HIGH FAR N OF THE AREA EXTENDS RIDGE SOUTHWARD TO 19N W OF 127W.

THE COLD FRONT IS OVER THE NORTHERN GULF OF CALIFORNIA...WITH 
MODERATE TO FRESH WINDS OCCURRING N OF 25N AHEAD OF THE FRONT... 
WITH STRONGEST WINDS IN A VERY NARROW BAND SE OF THE FRONT. 
SIMILAR CONDITIONS WILL PREVAIL NEAR THE FRONT THROUGH THIS 
AFTERNOON AS IT PUSHES SE...WITH WINDS SHIFTING W AT 10-15 KT 
BEHIND THE FRONT. 

GAP WIND FLOW DOMINATES THE FORECAST AREA E OF 120W...WITH ALL 
THE TYPICAL GAP AREAS SEEING MODERATE TO FRESH FLOW SPILLING 
ACROSS CENTRAL AMERICA INTO THE EASTPAC FROM THE CARIBBEAN. MOST 
OF THESE LOCATIONS WILL SEE WINDS MAXIMUM DRAINAGE FLOW DURING 
LATE NIGHT AND EARLY MORNING HOURS THROUGH EARLY WED.

GULF OF TEHUANTEPEC...FRESH TO STRONG NORTHERLY WINDS CURRENTLY 
OBSERVED THROUGH AND DOWNSTREAM OF THE GULF WILL PULSE TO 30 KT 
TONIGHT...WITH SEAS TO 10-11 FT BY EARLY TUE MORNING. THE NEXT 
SIGNIFICANT GAP WIND EVENT IS FORECAST TO BEGIN LATE THU...AS A 
STRONG COLD FRONT MOVES ACROSS THE W GULF OF MEXICO...AND WINDS 
QUICKLY INCREASE TO A STRONG GALE THU NIGHT AND REACH NEAR STORM 
FORCE EARLY FRI.

THE GULF OF PAPAGAYO...FRESH TO STRONG NE WINDS WILL CONTINUE... 
WITH NOCTURNAL PULSES REACHING 25-30 KT TONIGHT AND 20-25 KT TUE 
NIGHT. FRESH NE WINDS ALSO LIKELY IN AND DOWNWIND OF THE GULF OF 
FONSECA EACH NIGHT DURING THE NIGHT TIME MAX ACROSS PAPAGAYO.

THE GULF OF PANAMA...NORTHERLY WINDS 15-25 KT ARE EXPECTED TO 
PREVAIL ACROSS THE GULF AND DOWNSTREAM TO NEAR 04N FOR THE NEXT 
24-48 HOURS...WHERE SEAS WILL BUILD 8-9 FT THROUGH TUE NIGHT.

$$ 
MUNDELL



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Page last modified: Monday, 02-Mar-2015 15:43:00 UTC