000
AXPZ20 KNHC 261603
TWDEP 

TROPICAL WEATHER DISCUSSION
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
1605 UTC THU AUG 26 2010

TROPICAL WEATHER DISCUSSION FOR THE EASTERN PACIFIC OCEAN FROM 
THE EQUATOR TO 32N...EAST OF 140W.

BASED ON 1200 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY THROUGH 
1500 UTC.

...SPECIAL FEATURES...

AT 26/1500 UTC...HURRICANE FRANK IS CENTERED NEAR 17.4N 109.3W 
MOVING W OR 275 DEG AT 10 KT. ESTIMATED MINIMUM CENTRAL PRESSURE 
IS 984 MB. MAXIMUM SUSTAINED WINDS ARE 70 KT WITH GUSTS TO 85 
KT. TROPICAL STORM FORCE WINDS EXTEND OUTWARD UP TO 70 NM FROM  
THE CENTER. MAX SEAS ARE ESTIMATED AT 25 FT...WITH 12 FT SEAS UP 
TO 240 NM SE OF THE CENTER. NUMEROUS MODERATE TO STRONG TSTMS 
WITHIN 180 NM SE AND 60 NM NW SEMICIRCLES. SEE LATEST NHC 
FORECAST/ADVISORY UNDER AWIPS/WMO HEADERS MIATCMEP4/ WTPZ24 KNHC 
FOR MORE DETAILS.

...TROPICAL WAVES...

TROPICAL WAVE ALONG 83W N OF 07N IS MOVING W AT 10-15 KT. 
SCATTERED MODERATE TO ISOLATED STRONG CONVECTION AT THE SOUTHERN 
END OF THE WAVE N OF 7N BETWEEN 83W AND 85W. 

...ITCZ...

THE INTERTROPICAL CONVERGENCE ZONE AXIS IS ANALYZED FROM 07N85W 
TO 09N100W THEN RESUMES ALONG 13N114W TO 09N140W. ISOLATED 
MODERATE TO STRONG CONVECTION WITHIN 90 NM S OF AXIS BETWEEN 
112W AND 116W.07N78W. 

...DISCUSSION...

ALOFT...A RIDGE EXTENDS W FROM NW MEXICO THROUGH AN ANTICYCLONE 
CENTERED NEAR 25N116W TO BEYOND 23N140W. UPPER LEVEL DIFFLUENCE 
ASSOCIATED WITH FEATURE IS ENHANCING CONVECTION WITHIN 50 NM OF 
THE COAST OF MAINLAND MEXICO FROM 21N TO 24N. HURRICANE FRANK IS 
EMBEDDED IN WEAK TO MODERATE EASTERLY FLOW SOUTH OF THE RIDGE 
AXIS. WATER VAPOR IMAGERY SHOWS MODERATE SUBSIDENCE AND DRY AIR 
PRESENT OVER A LARGE PORTION OF THE AREA OUTSIDE THE ITCZ REGION 
N OF 16N W OF 120W.

SURFACE...SUBTROPICAL RIDGE FROM 30N140W TO NEAR 20N125W. S 
10-15 KT MONSOON WINDS DOMINATE REGION S OF 10N BETWEEN 100W AND 
130W. W OF 130W WINDS GRADUALLY BECOME SE AND TRANSITION INTO A 
TRADE WIND REGIME. SW WINDS ASSOCIATED WITH LARGE SCALE FLOW 
INTO FRANK ARE FOUND BETWEEN 10N AND 12N FROM 105W TO 132W...AND 
5-10 KT W WINDS ARE EVIDENT E OF 100W. FRANK AND ITS ASSOCIATED 
WEATHER EFFECTS DOMINATE SYNOPTIC ENVIRONMENT FROM 12N TO 20N 
BETWEEN 105W AND 111W. IR SAT IMAGERY SHOWS VERY LITTLE TSTM 
ACTIVITY IN ITCZ W OF 115W. PRES GRADIENT IS FCST TO BUILD OVER 
N CENTRAL WATERS LATE FRI INTO SAT. EXPECT N WINDS 15-20 KT AND 
SEAS OF 8 FT N OF 28N BETWEEN 121W AND 133W.

MARINE...ASIDE FROM MARINE CONDITIONS ASSOCIATED WITH HURRICANE 
FRANK...LONG PERIOD CROSS EQUATORIAL S-SW SWELLS CONTINUE TO 
BUILD SEAS TO 11 FT RANGE OVER MUCH OF THE AREA BETWEEN 80W AND 
A LINE FROM 21N115W TO 10N135W TO 00N135W. THIS AREA OF 8 FT 
SEAS WILL GRADUALLY SHRINK OVER THE NEXT COUPLE OF DAYS WITH A
PERIOD LESS THAN 13 SECONDS. 

$$
MUNDELL