000
AXPZ20 KNHC 221011
TWDEP 

TROPICAL WEATHER DISCUSSION 
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL 
1005 UTC SAT APR 22 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 
0945 UTC.

...ITCZ...
ITCZ AXIS IS CENTERED ALONG 6N78W 6N92W 6N100W 5N120W 4N140W.
SCATTERED STRONG CONVECTION CONVECTION IS WITHIN 60 NM OF THE
AXIS BETWEEN 131W-135W. SCATTERED MODERATE/ISOLATED STRONG 
CONVECTION IS OCCURRING WITHIN 60 NM OF THE AXIS BETWEEN 
122W-131W. ISOLATED STRONG CONVECTION IS WITHIN 120 NM NORTH
OF THE ITCZ WEST OF 138W.

...DISCUSSION...
LONGWAVE TROUGH EXTENDS FROM A CYCLONIC CIRCULATION WELL NORTH
OF THE AREA THROUGH 32N121W ALONG 26N124W TO 21N127W. A SHORTWAVE
TROUGH IS RAPIDLY SWINGING SOUTHEASTWARD THROUGH THE LONGWAVE
TROUGH FROM  32N123W TO 28N131W. A JET STREAM BRANCH ENTERS THE
REGION THROUGH 22N140W AND REACHES TO 18N128W WHERE IT SPLITS
INTO TWO SEGMENTS...ONE RUNNING NORTHEASTWARD THROUGH 22N120W 
TO ACROSS NORTHERN BAJA CALIFORNIA...THE OTHER DIVING 
SOUTHEASTWARD TO 14N120W TO 8N110W. SATELLITE DERIVED WINDS 
REVEAL MAXIMUM WINDS OF 70-100 KT IN ASSOCIATION WITH THE JET 
STREAM. TROPICAL MOISTURE SOUTH OF THE JET AXIS IS BEING 
ADVECTED NE TOWARD BAJA CALIFORNIA. EAST OF THE TROUGH IS A 
BROAD MID/UPPER LEVEL RIDGING COVERS THE EASTERN PACIFIC
SOUTH OF 20N EAST OF 110W INCLUDING MEXICO AND CENTRAL AMERICA
WITH A MID/UPPER LEVEL ANTICYCLONIC CENTER NEAR 8N97W. THIS
AREA IS DEPICTED ON WATER VAPOR IMAGERY AS BEING UNDER MODERATE
TO STRONG SUBSIDENCE AND DRY STABLE CONDITIONS. ASIDE FROM
AFTERNOON AND EARLY EVENING CONVECTION FIRING UP OVER THE
INTERIOR PORTIONS OF MEXICO AND CENTRAL AMERICA DUE TO DAYTIME
HEATING...ONLY ISOLATED SHOWERS AND THUNDERSTORMS ARE NOTED OVER 
THIS AREA.

$$
AGUIRRE