000
AXPZ20 KNHC 241521
TWDEP 

TROPICAL WEATHER DISCUSSION 
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
1605 UTC THU APR 24 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 
1515 UTC.

...ITCZ...
ITCZ AXIS ALONG 6N77W 8N85W 4N110W 2N1120W 3N130W 2N140W. 
SCATTERED MODERATE TO STRONG WITHIN 90-120 NM OF AXIS BETWEEN 
117W AND 125W. WIDELY SCATTERED MODERATE WITHIN 240 NM OF THE 
AXIS BETWEEN 80W AND 112W. 

...DISCUSSION...
MOSTLY ZONAL FLOW PATTERN ACROSS THE AREA N OF 20N WITH FLAT 
BROAD UPPER LEVEL TROUGH EXTENDING FROM THE SOUTHERN GREAT 
PLAINS OF THE U.S. THROUGH NORTHERN MEXICO ACROSS CENTRAL BAJA 
CALIFORNIA TO 26N130W. SATELLITE DERIVED WINDS INDICATED 85-100
KT JET CORE S OF THE BROAD TROUGH W OF 130W AND A 65-80 KT JET 
CORE E OF 130W SLICING EWD INTO NORTHERN MEXICO NEAR 30N105W. 
MODERATE TO STRONG SUBSIDENCE NOTED WITHIN 240-360 NM NM N OF 
WIND MAX. ANTICYCLONIC CIRCULATION CENTERED NEAR 8N120W WITH 
BROAD RIDGE COVERING REMAINING AREA S OF 20N W OF 110W.

UPPER LEVEL RIDGE EXTENDS FROM COLOMBIA WWD ACROSS PANAMA AND 
COSTA RICA TO 12N100W. DRY AIR IS LOCATED N OF THE RIDGE AXIS 
WITH ABUNDANT TROPICAL MOISTURE S OF THE RIDGE AXIS WITHIN AN 
AREA OF DIFLUENT SE FLOW. A NARROW SHEAR AXIS SEPARATES THE 
ANTICYCLONIC CIRCULATION AND THE RIDGE FROM CENTRAL MEXICO FROM 
18N98W TO 10N108W.

AT THE SURFACE...A 1026 MB HIGH PRES IS CENTERED NEAR 28N132W 
WITH RIDGE FROM THE HIGH TO 12N1110W. GRADIENT BETWEEN THE HIGH 
AND LOWER PRESSURE OVER MEXICO WAS RESULTING IN NW WINDS OF 
20-25 KT ALONG THE BAJA CALIFORNIA COAST. EASTERLY TRADES S OF 
THE HIGH WERE ADVECTING BROKEN STRATOCUMULUS CLOUDS WESTWARD 
OVER THE AREA N OF 10N W OF 120W.

$$
COBB