000
AXPZ20 KNHC 121526
TWDEP 

TROPICAL WEATHER DISCUSSION
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
1605 UTC MON MAY 12 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 
1500 UTC.

...ITCZ...

ITCZ AXIS IS CENTERED ALONG 04N105W TO 05N113W TO 05N121W TO 
05N126W TO 04N134W TO 05N140W. ISOLATED SHOWERS/TSTMS FROM 3N-8N 
BETWEEN 81W-90W. SCATTERED/NUMEROUS MODERATE CONVECTION WITHIN 
90 NM OF ITCZ BETWEEN 127W-137W.

...DISCUSSION...

SUBTROPICAL PACIFIC...
A MID/UPPER LEVEL TROUGH EXTENDS FROM SOUTHERN CALIFORNIA SW TO 
26N130W THEN CONNECTS TO A CUT-OFF LOW LOCATED JUST NE OF 
HAWAII. MODERATE SUBSIDENCE SURROUNDS THIS TROUGH AND COVERS THE 
AREA N OF 20N W OF 117W. THE SUBTROPICAL HIGH IS CENTERED N OF 
THE AREA NEAR 35N138W AND IS PRODUCING A BROKEN STRATOCUMULUS 
FIELD OVER MUCH OF THE REGION W OF BAJA CALIFORNIA AND 113W. THE 
SUBTROPICAL JET LIES ON THE SOUTHERN PERIPHERY OF THE 
AFOREMENTIONED TROUGH FROM 16N140W TO 30N112W WITH AN UPPER 
LEVEL MOISTURE BAND STREAMING INTO NW MEXICO. THE JET IS LOW 
ENOUGH IN ALTITUDE THAT IT IS INTERSECTING SOME OF THE HIGHER 
TERRAIN OF NW MEXICO...FORMING STATIONARY CLOUDS OVER THE 
MEXICAN STATE OF CHIHUAHUA.

TROPICAL PACIFIC...
STRONG UPPER LEVEL RIDGING COVERS MUCH OF THE TROPICAL PACIFIC 
WATERS...ANCHORED BY AN UPPER HIGH OVER THE SRN YUCATAN 
PENINSULA WITH A RIDGE AXIS EXTENDING SW TO 4N140W. A COUPLE OF 
SURFACE TROUGHS ARE EMBEDDED WITHIN THE ITCZ AND ARE CAUSING A 
FEW AREAS OF ASSOCIATED CONVECTION...BUT NO DEVELOPMENT OF THESE 
SYSTEMS APPEARS IMMINENT. THE FIRST TROUGH LIES SW OF THE GULF 
OF TEHUANTEPEC ROUGHLY ALONG 100W/101W AND IS PRODUCING 
SCATTERED MODERATE/ISOLATED STRONG CONVECTION FROM 5N-13N 
BETWEEN 96W-105W. A SECOND TROUGH IS LOCATED FARTHER W ALONG 
124W S OF 12N ALTHOUGH IT IS PRODUCING LESS CONVECTION...WITH 
SCATTERED MODERATE CONVECTION FROM 9N-12N BETWEEN 123W-126W. 
ELSEWHERE...AN AREA OF SCATTERED MODERATE CONVECTION HAS FORMED 
ALONG THE LAND BREEZE OFF THE COAST OF NICARAGUA...PROPAGATING 
WWD FROM 9N-13N BETWEEN 87W-90W.

$$
BERG/BELL