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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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