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Eastern Pacific Tropical Weather Discussion (Text)



000
AXPZ20 KNHC 010251
TWDEP 

TROPICAL WEATHER DISCUSSION                                    
NWS NATIONAL HURRICANE CENTER MIAMI FL                         
0405 UTC WED APR 1 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 0000 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY THROUGH 
0230 UTC. 

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

ITCZ EXTENDS FROM 04N122W TO 03N131W TO 06N140W WITH NO 
SIGNIFICANT CONVECTION. SCATTERED MODERATE CONVECTION N OF 
THE CONVERGENCE ZONE FROM 09N TO 12N BETWEEN 121W AND 127W.

...DISCUSSION...

STRONG RIDGE ANCHORED BY 1035 MB SUBTROPICAL HIGH CENTERED NEAR 
36N141W DOMINATES THE REGION. THE RIDGE EXTENDS SOUTHWARD TO 
AROUND 16N W OF 112W. THE STRONG HIGH WILL SHIFT EAST TONIGHT 
AND TIGHTEN THE PRESSURE GRADIENT W OF SOCAL TO INDUCE GALE 
FORCE WINDS N OF THE DISCUSSION AREA ALONG THE COAST. EXPECT 
WINDS TO REACH 20-25 KT N OF 28-29N DURING THE NEXT 12 TO 36 
HOURS...BUT MOST SIGNIFICANT MARINE FACTOR WILL BE N-NW SWELL 
REACHING 12-14 FT IN NE WATERS N OF 27N BETWEEN 115W AND 125W. 
EXPECT PEAK SEAS WED NIGHT INTO THU MORNING. 

NWP GUIDANCE SUGGESTS THAT FRESH NE-E WINDS ACROSS MOST OF THE 
WATERS N OF 20N W OF 120W BY WED NIGHT. ADDITIONAL PULSES OF NW 
SWELL WILL SWEEP INTO THE NW PART OF THE FORECAST AREA TO MIX 
WITH WIND WAVES AND BUILD SEAS TO 9-11 FT N OF 20N W OF 120W BY 
WED AFTERNOON.

MAINLY LIGHT TO GENTLE WINDS PREVAIL ELSEWHERE ACROSS THE REGION 
E OF 110W EXCEPT FOR GAP WINDS TO 20 KT DOWNWIND FROM PAPAGAYO. 
LONG PERIOD S SWELL CONTINUES TO FADE WITH SEAS 5-6 FT. ANOTHER 
BATCH OF CROSS EQUATORIAL SOUTHERLY SWELL WILL SPREAD ACROSS THE 
SOUTH WATERS TODAY AND COULD REACH THE COASTS OF CENTRAL AMERICA 
AND MEXICO BY LATE THU. 

PULSING OF NOCTURNAL WINDS ARE EXPECTED IN THE GULF OF PAPAGAYO 
WED MORNING...REACHING 20-25 KT BETWEEN 0600 AND 1200 UTC...WITH 
COMBINED SEAS REACHING 6-7 FT DOWNWIND OF THE GULF. LATEST MODEL 
GUIDANCE SUGGESTS ANOTHER BRIEF GAP WIND EVENT WITH WINDS TO 25-
30 KT IS POSSIBLE IN TEHUANTEPEC AND PAPAGAYO THIS WEEKEND.

$$
MUNDELL

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Page last modified: Wednesday, 01-Apr-2015 02:52:05 UTC