000
AXPZ20 KNHC 110916
TWDEP 

TROPICAL WEATHER DISCUSSION                                    
NWS NATIONAL HURRICANE CENTER MIAMI FL                          
1005 UTC THU APR 11 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 0600 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY THROUGH 
0900 UTC.

...INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH...              
MONSOON TROUGH 9N84W 11N93W TO 7N100W. ITCZ 7N100W TO 9N120W
TO 4N140W. SCATTERED MODERATE ISOLATED STRONG CONVECTION FROM
4N-7N BETWEEN 90W-93W AND FROM 10N-12N BETWEEN 107W-111W AND
WITHIN 90 NM OF AXIS FROM 119W-125W. 

...DISCUSSION...                                             
AN UPPER LEVEL TROUGH IN THE N PORTION OF THE DISCUSSION AREA
EXTENDS FROM 32N1121W TO 26N128W. MODERATE TO STRONG SUBSIDENCE
WITH DRY AIR AT THE MIDDLE AND UPPER LEVELS IS N OF 20N W OF 110W.
AN UPPER LEVEL RIDGE S OF THE TROUGH EXTENDS FROM ANTICYCLONIC 
CIRCULATION IN THE DEEP TROPICS NEAR 7N125W TO 23N131W. UPPER
LEVEL DIFFLUENT FLOW WITH THE ANTICYLONE IS ENHANCING CONVECTION
ALONG THE ITCZ FROM 119W-125W. A 95-100 KT JETSTREAM OVER THE TOP
OF THE RIDGE EXTENDS FROM 19N140W TO 23N130W TO 15N113W. MIDDLE
AND HIGH CLOUDS ARE WITHIN 450 NM S OF THE JET FROM 140W-130W.
AN UPPER LEVEL TROUGH IS E OF THE RIDGE WITH AXIS FROM THE 
SOUTHERN TIP OF BAJA CALIFORNIA TO 3N101W. AN UPPER LEVEL
ANTICYCLONIC CIRCULATION IS CENTERED OFF THE COAST OF NICARAGUA
NEAR 11N86W WITH RIDGE FROM THE CENTER ACROSS HONDURAS INTO THE
GULF OF MEXICO.

SURFACE RIDGE IS ACROSS THE AREA N OF 15N W OF 110W. THE PRES
GRADIENT HAS RELAXED AND WINDS HAVE DECREASED TO 20 KT OR LESS
HOWEVER LARGE NW SWELLS TO 10 FT ACROSS THE THE AREA N OF 5N W
OF 110W.

$$
DGS