000
AXPZ20 KNHC 042201
TWDEP 

TROPICAL WEATHER DISCUSSION
NWS NATIONAL HURRICANE CENTER MIAMI FL                           
2205 UTC SUN AUG 04 2013

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 1800 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY THROUGH 
2100 UTC.

...SPECIAL FEATURES... 

TROPICAL STORM HENRIETTE AT 12.2N 126.8W AT 21 UTC WITH CENTRAL
PRES 1004 MB AND MAXIMUM SUSTAINED WIND 40 GUSTS TO 50 KT MOVING
W OR 260 DEGREES AT 7 KT. NUMEROUS MODERATE TO STRONG CONVECTION
WITHIN 180 NM S AND 60 NM N SEMICIRCLES.  HENRIETTE FORECAST TO
INTENSIFY AS SYSTEM MOVES W OVER WARM SEA SURFACE TEMPERATURES
AND FAVORABLE UPPER ENVIRONMENT DURING THE NEXT COUPLE OF DAYS.
SEE LATEST NHC FORECAST/ADVISORY UNDER AWIPS/WMO HEADERS 
MIATCMEP3/WTNT23 KNHC FOR ADDITIONAL DETAILS.

GIL HAS BEEN RAPIDLY WEAKENING AND NOW DOWNGRADED TO A TROPICAL
DEPRESSION AT 14.2N 136.6W WITH CENTRAL PRES 1007 MB AND MAXIMUM
SUSTAINED WIND 30 GUSTS TO 40 KT.  IT MOVES W-SW OR 255 DEGREES
AT 7 KT.  SEA SURFACE TEMPERATURES ARE DIMINISHING AND UPPER
LEVEL SHEAR HAS INCREASED OVER GIL...SO ITS DOOM IS REFLECTED IN 
FORECAST.  SCATTERED MODERATE TO ISOLATED STRONG CONVECTION
WITHIN 60 NM NW SEMICIRCLE.  GIL FORECAST TO CONTINUE WEAKENING
INTO REMNANT LOW PRES BY EARLY MON.  SEE LATEST NHC FORECAST/ 
ADVISORY UNDER AWIPS/WMO HEADERS MIATCMEP2/WTNT22 KNHC FOR 
ADDITIONAL DETAILS.

...INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH...           
MONSOON TROUGH EXTENDS FROM 10N85W TO 08N92W TO 15N124W TO 
14N127W.  SCATTERED MODERATE TO ISOLATED STRONG CONVECTION 
WITHIN 330 NM N AND 90 NM S OF AXIS FROM 93W TO 109W.  SCATTERED
MODERATE TO STRONG CONVECTION WITHIN 300 NM S OF AND 90 NM N OF
AXIS FROM 116W TO 123W.

...DISCUSSION... 
DRY REGION IN NW PORTION OF E PAC SHRINKING TO N OF 23N W OF
117W AS UPPER LEVEL TROUGH SHIFTS N OF BASIN.  ELONGATED RIDGE
WITH ANTICYCLONES OVER TROPICAL DEPRESSION GIL AND TROPICAL
STORM HENRIETTE EXTEND TO 113W.  ABUNDANT TROPICAL MOISTURE...
WARM SEA SURFACE TEMPERATURE STILL AVAILABLE FOR PLENTY OF 
CONVECTION UNDER RIDGE AND UPPER LEVEL ENVIRONMENT LOOKS
FAVORABLE...AT LEAST FOR HENRIETTE.   

...ELSEWHERE AT THE LOWER LEVELS...
WEAKENING HIGH PRES CENTER 1023 MB N OF AREA AT 34N150W HAS MOVED
W WITH ITS RIDGE EXTENDING SE INTO AREA TO 23N118W. CONSEQUENTLY
TRADES HAVE DIMINISHED AND SEAS SUBSIDED BELOW 8 FT.  ONLY
CONDITIONS PRODUCED BY THE TROPICAL CYCLONES REMAIN AS THREATS. 

$$
WALLY BARNES