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East Pacific Tropical Weather Discussion
000
AXPZ20 KNHC 101005
TWDEP
TROPICAL WEATHER DISCUSSION
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
1005 UTC SUN MAY 10 2009
TROPICAL WEATHER DISCUSSION FOR THE EASTERN PACIFIC OCEAN FROM
THE EQUATOR TO 32N...EAST OF 140W.
BASED ON 0600 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY THROUGH
0900 UTC.
...ITCZ...
AXIS ALONG 05N77W TO 08N86W TO 09N109W TO 05N116W TO 07N130W TO
07N140W. ISOLATED MODERATE CONVECTION WITHIN 240 NM OF AXIS E
OF 105W. SCATTERED MODERATE TO STRONG CONVECTION WITHIN 120 NM
OF AXIS FROM 110W TO 120W. SCATTERED MODERATE ISOLATED STRONG
CONVECTION WITHIN 120 NM OF AXIS E OF 130W.
...DISCUSSION...
UPPER LEVEL CYCLONIC CIRCULATION AT 22N118W REMAINS BLOCKED FROM
MOVING E BY LARGE ANTICYCLONE AT 14N100W. BETWEEN BOTH THESE
FEATURES A BROAD SWATH OF DEEP LAYER MOISTURE IS ADVECTED NE
INTO MEXICO WHERE THERMAL TROUGH TURNS IT INTO CONVECTION WITH
THE HELP OF DAYTIME HEATING. MOISTURE SWATH CONTINUES INTO
CENTRAL TEXAS FEEDING COLD FRONT MOVING SE.
AT THE SURFACE...
QUICKLY WEAKENING HIGH PRES CENTER 1028 MB AT 34N135W FORCED E
BY APPROACHING COLD FRONT NOW ALONG 145W. THIS DECREASES AREA
COVERAGE OF TRADE WINDS TO W OF 135W AND EVENTUALLY WEAKENS
TRADES BELOW 20 KT WITHIN 24 HRS. GALE FORCE WINDS N OF 32N HAS
ALSO DIMINISH AND N SWELLS ENCROACHING INTO E PAC SUBSIDE
GRADUALLY THROUGH NEXT TWO DAYS.
WEAK LOW PRES SURFACE TROUGH FROM 11N110W TO 04N115W ATTRACTING
FRESH SE-S WINDFLOW ALONG WITH MODERATE SWELL TRAINS OBSERVED
S OF 06N FROM 107W TO 130W. TROUGH WEAKENS AND SWELLS SUBSIDE
WITHIN 24 HRS.
GAP WINDS...RETURN OF STRONG TRADE WINDS IN WRN CARIBBEAN
PROMPTED BY 1008 MB LOW PRES OVER COLOMBIA ALLOW FOR ELY FLOW TO
SEEP THROUGH NRN COSTA RICA AND SRN NICARAGUA INTO GULF OF
PAPAGAYO...WITH FRESH BREEZE BEGINNING LATER TODAY.
$$
WALLY BARNES
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