000
AXPZ20 KNHC 280342
TWDEP 

TROPICAL WEATHER DISCUSSION    
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
0405 UTC SAT APR 28 2007

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 
9315 UTC.

...ITCZ...

ITCZ AXIS IS CENTERED ALONG 9N81W 7N87W 9N100W 5N120W 5N140W. 
SCATTERED MODERATE ISOLATED STRONG CONVECTION IS NOTED WITHIN 15 
NM OF 2N78W AND WITHIN 120 NM EITHER SIDE OF LINE 9N85W 4N94W 
AND WITHIN 60 NM EITHER SIDE OF LINE 9N135W 9N140W.

...DISCUSSION...

AN UPPER RIDGE LIES OVER THE W PORTION CRESTING ALONG 27N140W 
29N131W 24N121W WITH UPPER MOISTURE NOTED UNDER THE RIDGE. AN 
UPPER CYCLONE IS OVER THE BAJA PENINSULA NEAR 28N112W AND IS 
DRIFTING ESE WITH TIME. DRY UPPER AIR IS INDICATED OVER THE 
DISCUSSION AREA N OF 20N BETWEEN 127W AND 106W...ALSO SHIFTING E 
WITH TIME. AN UPPER ANTICYCLONE IS OVER THE BAY OF CAMPECHE NEAR 
19N92W WITH AN ASSOCIATED RIDGE EXTENDING NW TO A CREST OVER THE 
S CENTRAL CONUS ALONG 32N103W 32N82W. UPPER MOISTURE IS ADVECTED 
NE UNDER THIS RIDGE OVER THE N GULF OF MEXICO. 

AN UPPER ANTICYCLONE IS NOTED OVER THE DEEP TROPICS NEAR 9N102W 
WITH A RIDGE EXTENDING W OVER THE ITCZ TO NEAR 9N124W WITH 
SLIGHT ENHANCEMENT OF CONVECTION. SOME OF THE DEBRIS MOISTURE 
SPREADS NE ACROSS THE COAST OF MEXICO NEAR 103W. 

AN UPPER RIDGE EXTENDS W OFF THE COAST OF S AMERICA TO A CREST 
NEAR 7N91W. UPPER DIFFLUENCE IS ENHANCING ITCZ CONVECTION E OF 
92W WITH THE DEBRIS MOISTURE SPREADING NE ACROSS CENTRAL 
AMERICA.

GAP WINDS...BRISK ELY TRADES OVER THE W CARIBBEAN WILL SURGE 
INTO THE GULF OF PAPAGAYO FOR AT LEAST A COUPLE MORE DAYS.

$$
NELSON