000
AXPZ20 KNHC 080923
TWDEP 

TROPICAL WEATHER DISCUSSION
NWS NATIONAL HURRICANE CENTER MIAMI FL
1005 UTC THU AUG 08 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 0000 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY THROUGH 
0215 UTC.

...SPECIAL FEATURES...   
HURRICANE HENRIETTE IS CENTERED NEAR 17.2N 137.4W AT 0900 UTC 
MOVING WNW AT 8 KT. ESTIMATED CENTRAL PRESSURE IS 984 MB. 
MAXIMUM SUSTAINED WINDS 75 KT WITH GUSTS TO 90 KT. NUMEROUS 
STRONG CONVECTION WITHIN 60 NM W AND 30 NM E SEMICIRCLES. 
CONVECTION REMAINS STRONG NEAR THE CORE OF HENRIETTE...BUT 
CONTINUES TO DIMINISH ACROSS THE E AND NE PERIPHERY. HENRIETTE 
IS EXPECTED TO TURN MORE WLY TODAY THEN TURN MORE WSW OVER THE 
NEXT FEW DAYS WHILE GRADUALLY WEAKENING. SEE THE LATEST NHC 
FORECAST/ADVISORY UNDER AWIPS/WMO HEADERS MIATCMEP3/WTPZ23 KNHC 
FOR ADDITIONAL DETAILS.

LOW PRES CENTERED NEAR 11N108W 1011 MB. SCATTERED MODERATE 
ISOLATED STRONG CONVECTION IS WITHIN 150 NM N SEMICIRCLE OF LOW. 
THE LOW WILL CONTINUING MOVING W AND COULD POSSIBLY DEVELOP INTO 
A TROPICAL CYCLONE WITHIN THE NEXT 48 HOURS

...INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH...    
MONSOON TROUGH FROM 7N78W TO 10N90W TO 1011 MB LOW 11N107W TO 
ANOTHER 1011 MB LOW 9N128W TO 12N132W. NUMEROUS MODERATE TO 
STRONG CONVECTION WITHIN 275 NM S OF AXIS FROM 78-89W. SCATTERED 
MODERATE ISOLATED STRONG CONVECTION WITHIN 180 NM S OF AXIS FROM 
100W-102W AND WITHIN 150 NM N OF AXIS FROM 106W-109W AND WITHIN 
180 NM S OF AXIS FROM 128W-132W.

...DISCUSSION...                                             
MOSTLY WESTERLY ZONAL FLOW IN THE UPPER LEVELS N OF 25N WITH 
65-75 KT JET STREAM FROM 27N140W TO 27N121W. UPPER LEVEL RIDGE 
EXTENDS FROM AN ANTICYCLONIC CIRCULATION CENTERED NEAR 20N131W 
TO SOUTHERN BAJA CALIFORNIA. MODERATE TO STRONG SUBSIDENCE WITH 
DRY AND STABLE AIR AT THE MIDDLE AND UPPER LEVELS COVERS THE 
AREA N OF 15N BETWEEN 110W AND 130W AND N OF 20N W OF 124W. 
ABUNDANT DEEP LAYER TROPICAL MOISTURE IS FROM 5N-15N E OF 135W.
AN UPPER LEVEL CYCLONIC CIRCULATION EXTENDS FROM SOUTHERN MEXICO 
TO A CYCLONIC CIRCULATION CENTERED NEAR 12N96W.

BROAD SURFACE HIGH PRES RIDGE IS N OF 20N W OF 117W WITH A 1023 
MB HIGH PRES CENTER NEAR 30N 134W. OUTSIDE OF THE HENRIETTE 
SURFACE WINDS ACROSS THE AREA ARE 20 KT OR LESS AND SEAS ARE 
LESS THAN 8 FT.

$$
DGS