000
AXPZ20 KNHC 050332
TWDEP 

TROPICAL WEATHER DISCUSSION  
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
0405 UTC WED APR 05 2006

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 0315 UTC.

...ITCZ...
ITCZ AXIS 5N77W 7N85W 4N93W 4N102W 7N115W 4N140W. SCATTERED 
MODERATE ISOLATED STRONG CONVECTION WITHIN 60 NM EITHER SIDE OF 
LINE 5N87W 4N94W AND WITHIN 30 NM EITHER SIDE OF LINE 7N112W 
8N121W AND WITHIN 30 NM OF 9N136W AND 7N136W.

...DISCUSSION...
THE NE PAC IS DOMINATED BY A LONGWAVE TROUGH WITH AN EMBEDDED A 
DEEP LAYERED CYCLONE NEAR 35N123W NOW SHIFTING E WITH TIME. A 
SHORTWAVE TROUGH EXTENDS SW INTO THE DISCUSSION AREA ALONG 
32N121W 18N136W. DRY UPPER AIR IS INDICATED W OF LINE 30N116W 
22N125W 18N140W. 

AN UPPER CUTOFF CYCLONE IS LOSING IDENTITY NEAR 1N121W. AN UPPER 
ANTICYCLONE IS NEAR 6N103W WITH A RIDGE EXTENDING N ALONG 
26N107W TO BEYOND 39N102W. TO THE E OF THE RIDGE ANOTHER 
SHORTWAVE TROUGH HAS MOVED OFF THE E COAST OF THE CONUS WITH A 
TROUGH EXTENDING SW ALONG 32N78W 21N84W. A BAND OF DRY UPPER AIR 
IS NOTED WITHIN 90 NM EITHER SIDE OF LINE 30N67W TO 20N80W WHERE 
IT WIDENS TO 300 NM AND CONTINUES W TO 17N106W.

UPPER DIFFLUENCE IS ENHANCING CLUSTERS OF CONVECTION ALONG THE 
ITCZ BETWEEN 110W AND 137W. DEBRIS MOISTURE FROM THIS CONVECTION 
IS ADVECTED NE BUT EVAPORATES IN VERY DRY UPPER AIR THAT 
ACCOMPANIES THE SHORTWAVE DESCRIBED ABOVE. A MORE SIGNIFICANT 
MOISTURE PLUME ENTERS THE DISCUSSION AREA WITHIN 420 NM EITHER 
SIDE OF LINE 10N140W THEN NARROWS TO WITHIN 240 NM EITHER SIDE 
OF POINTS 23N118W TO BEYOND 32N108W. OTHERWISE DRY UPPER AIR 
DOMINATES THE DISCUSSION AREA N OF THE ITCZ E OF 98W.

AT THE SURFACE...A SERIES OF FRONTAL BOUNDARIES HAVE NEARLY 
MERGED AND ARE LOSING IDENTITY ALONG 30N120W 20N135W WITH A 
RIDGE BRIDGING THESE REMNANTS ALONG 28N140W 17N108W.  A WEAK LOW 
PRES 1010 MB IS BARELY EVIDENT NEAR 19N105W.

GULF OF PAPAGAYO...LATEST SSMI DATA AND QSCAT WINDS INDICATE NE 
WINDS 20 KT WITHIN 60 NM EITHER SIDE LINE 9N94W 11N86W. THESE 
GAP WINDS ARE EXPECTED TO FLUCTUATE TO 20 KT THROUGH 42 HOURS.  
HIGH PRES IN THE GULF OF MEXICO BRIDGED THROUGH THE ISTHMUS OF 
TEHUANTEPEC TUE MORNING AT 20-30 KT. THESE N WINDS SHOULD 
DISSIPATE WED AS THE LOW LEVEL FLOW BECOMES SE IN THE BAY OF 
CAMPECHE.

$$
NELSON