000
AXPZ20 KNHC 261552
TWDEP 

TROPICAL WEATHER DISCUSSION 
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
1605 UTC SAT APR 26 2008

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 
1530 UTC.

...ITCZ...
ITCZ AXIS ALONG 4N78W 7N90W 5N110W 2N130W 4N140W. SCATTERED 
MODERATE TO STRONG WITHIN 120-180 NM OF AXIS W OF 129W. 
SCATTERED MODERATE ISOLATED STRONG WITHIN 120 NM OF THE AXIS 
BETWEEN 84W AND 89W. 

SCATTERED MODERATE ISOLATED STRONG CONVECTION FROM 08N TO 11N 
BETWEEN 108W AND 115W...AND FROM 12N TO 14N BETWEEN 90W AND 93W.

...DISCUSSION...
W OF 100W...
AMPLIFICATION OF THE OVERALL PATTERN STILL UNDERWAY AS A 
MID TO UPPER LEVEL RIDGE BUILDS NWD OVER THE WESTERN PORTION OF 
THE DISCUSSION AREA. THE RIDGE AXIS EXTENDS NORTHWARD FROM AN 
ANTICYCLONIC CIRCULATION CENTERED NEAR 14N125W THROUGH 32N128W.
DIFLUENT FLOW OVER THE W HALF OF THE RIDGE AXIS COUPLED WITH A 
80-90 KT UPPER LEVEL JET SKIRTING THE FAR NW CORNER OF THE AREA 
HAS RESULTED IN A LARGE AREA OF MAINLY HIGH LEVEL MOISTURE 
ADVECTED OVER THE AREA N OF 16N W OF 130W. DOWNSTREAM SHARPENING 
MID TO UPPER LEVEL TROUGH EXTENDS FROM SE ARIZONA ACROSS CENTRAL 
BAJA CALIFORNIA TO 19N120W. STRONG SUBSIDENCE WITHIN A BROAD 
AREA OF TROUGHING DOMINATES THE AREA N OF 20N BETWEEN 110W AND 
128W. DIFLUENT SWLY FLOW ALOFT E OF THIS TROUGH HAS RESULTED IN 
AN EXPANDING AREA OF MID AND UPPER CLOUDS OVER NRN MEXICO AND 
FURTHER E WAS FUELING A SQUALL LINE MOVING OFF THE TEXAS COAST. 
IN THE DEEP TROPICS DIFLUENT WLY FLOW ALOFT WAS ENHANCING 
SCATTERED MODERATE TO STRONG CONVECTION WITHIN 120-180 NM OF THE 
ITCZ W OF 129W. 

E OF 100W...
AN UPPER LEVEL RIDGE EXTENDS FROM NRN COLOMBIA WWD THROUGH 
NICARAGUA TO 12N110W. AREA OF MODERATE TO STRONG UPPER LEVEL 
SUBSIDENCE HAS MOVED NWD OVER CENTRAL AMERICA AND THE W 
CARIBBEAN. UPPER LEVEL SE FLOW WAS ADVECTING TROPICAL MOISTURE 
NWD OVER THE TROPICAL E PACIFIC FUELING SOME CLUSTERS OF 
CONVECTION IN THE AREA.  

AT THE SURFACE...1026 MB HIGH PRES N OF THE AREA NEAR 33N130W 
WITH ASSOCIATED RIDGE EXTENDING SE FROM THE HIGH TO 15N108W.

GAP WINDS...
COLD FRONT SLATED TO MOVE INTO THE GULF OF MEXICO LATE SUN 
WILL SPREAD COLD AIR SWD THROUGH THE GULF AND INTO THE GULF OF 
TEHUANTEPEC BY LATE MON. NWP MODELS ARE INDICATING WINDS MAY 
REACH GALE FORCE IN A LATE SEASON GAP WIND EVENT MON NIGHT INTO 
TUE. 

$$
COBB