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Eastern Pacific Tropical Weather Discussion (Text)



000
AXPZ20 KNHC 261510
TWDEP 

TROPICAL WEATHER DISCUSSION                                    
NWS NATIONAL HURRICANE CENTER MIAMI FL                         
1605 UTC SUN APR 26 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 
1430 UTC. 

...INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH...              
THE ITCZ EXTENDS FROM 08N95W TO A 1007 MB LOW NEAR 07N99W TO 
04N107W TO 05N112W...THEN RESUMES NEAR 08N130W TO A 1010 MB LOW 
NEAR 08N136W TO 06N140W. SCATTERED MODERATE ISOLATED STRONG 
WITHIN 120 NM EITHER SIDE OF THE AXIS BETWEEN 95W AND 103W...AND 
FROM 02N TO 05N BETWEEN 103W AND 111W. SCATTERED MODERATE FROM 
08N TO 12N BETWEEN 128W AND 133W.

...DISCUSSION...                                                
A MIDDLE TO UPPER LEVEL TROUGH IS NOTED ON WATER VAPOR IMAGERY 
OVER THE NORTHERN DISCUSSION WATERS WITH AXIS EXTENDING FROM THE 
PARENT UPPER LEVEL LOW CENTERED OVER THE SOUTHWESTERN U.S. SW TO 
27N114W TO A BASE NEAR 22N130W. WHILE OVERALL DRY AND STABLE AIR 
ALOFT REMAINS ASSOCIATED WITH THE TROUGHING AND ALSO AN UPPER 
LEVEL ANTICYCLONIC CIRCULATION TO THE W-NW OF THE TROUGH 
CENTERED NEAR 29N134W...A DISSIPATING COLD FRONT EXTENDS FROM 
NORTHERN BAJA CALIFORNIA NEAR 31N115W TO 30N120W TO 31N125W. NW 
WINDS IN THE RANGE OF 20 TO 25 KT ARE OCCURRING N OF 29N WITHIN 
120 NM OF THE BAJA COAST. WITH MAXIMUM SEAS AT 10 FT NEAR 
30N120W...SEAS 8 FT AND HIGHER COVER THE AREA N OF 26N E OF 125W 
IN NW SWELL. IN ADDITION...ON THE SOUTHEASTERN PERIPHERY OF THE 
UPPER LEVEL TROUGH...A 600 NM WIDE SWATH OF MOISTURE EXISTS 
ADVECTING THE MOISTURE AND CLOUDINESS NE AWAY FROM CONVECTION 
OCCURRING WITHIN THE ITCZ ZONE. THE WIND FIELD ASSOCIATED WITH 
THIS FEATURE IS EXPECTED TO DIMINISH BY MONDAY WITH SEAS 
GRADUALLY SUBSIDING THEREAFTER.

A 1027 MB SURFACE HIGH CENTER IS LOCATED NEAR 32N134W WITH A 
RIDGE AXIS EXTENDING SE FROM THE HIGH TO 18N110W. THE PRESSURE 
GRADIENT SW OF THE RIDGING AND N OF THE LOWER PRESSURE VALUES 
ASSOCIATED WITH THE ITCZ IS SUPPORTING AN AREA OF FRESH TO 
STRONG TRADES BETWEEN THE TWO FEATURES.

A PAIR OF SURFACE TROUGHS ARE EMBEDDED IN THE ITCZ WITH THE 
EASTERN TROUGH EXTENDING FROM 12N113W TO 09N114W TO 06N113W WITH 
SCATTERED MODERATE AND ISOLATED STRONG CONVECTION FROM 05N TO 
13N BETWEEN 112W AND 117W. THE WESTERN TROUGH EXTENDS FROM 
11N126W TO A 1009 MB LOW NEAR 07N127W TO 03N127W WITH SCATTERED 
MODERATE AND ISOLATED STRONG CONVECTION FROM THE EQUATOR TO 13N 
BETWEEN 118W AND 128W. THE AREA OF TRADES IS EXPECTED TO 
DIMINISH TO LESS THAN 20 KT BY 48 HOURS AS THE PRESSURE GRADIENT 
ACROSS THE REGION WEAKENS.

E OF 110W...OVERNIGHT SCATTEROMETER DATA INDICATES THAT WINDS 
CONDITIONS RANGE FROM A LIGHT TO MODERATE BREEZE AND ARE 
ACCOMPANIED BY 3 TO 6 FT SEAS.

$$
HUFFMAN

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Page last modified: Sunday, 26-Apr-2015 15:10:59 UTC