000
AXPZ20 KNHC 231514
TWDEP 

TROPICAL WEATHER DISCUSSION 
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
1605 UTC THU APR 23 2009

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...
AXIS IS ALONG 6N77W 7N90W 3N100W 5N115W 5N140W. SCATTERED 
MODERATE ISOLATED STRONG CONVECTION WITHIN 60 NM EITHER SIDE OF 
AXIS E OF 80W AND WITHIN 90 NM S OF AXIS FROM 90W-94W AND WITHIN 
60 NM EITHER SIDE OF AXIS FROM 127W-134W. 

...DISCUSSION...
MID/UPPER RIDGE EXTENDS FROM 32N125W TO 10N130W...BLOCKING A CUT 
OFF DEEP LAYER LOW NE OF HAWAII. A 90-105 KT JET STREAM BETWEEN 
THE UPPER LOW AND RIDGE CLIPS THE FAR NW PORTION OF THE AREA 
FROM 29N140W TO 32N135W. A DISSIPATING COLD FRONT ASSOCIATED 
WITH THE LOW IS ALSO OVER THE FAR NW PORTION OF THE AREA FROM 
32N137W TO 27N140W. OVERCAST LOW TOP CLOUDS WITH POSSIBLY A FEW 
SHOWERS ARE WITHIN 90 NM E OF THE DISSIPATING FRONT. MID/UPPER 
LEVEL TROUGH EXTENDS FROM SE ARIZONA SW TO THE TIP OF BAJA 
CALIFORNIA SCATTERED LIGHT SHOWERS E OF THE TROUGH OVER NE 
MEXICO S OF THE BIG BEND OF TEXAS. OTHERWISE MOSTLY WLY UPPER 
LEVEL FLOW E OF THE RIDGE.

SURFACE TROUGH WITH AXIS FROM SW ARIZONA S THROUGH THE MIDDLE OF 
THE GULF OF CALIFORNIA TO 26N110W. NO SIGNIFICANT WEATHER 
ASSOCIATED WITH THE TROUGH. ANOTHER SURFACE TROUGH IS ANALYZED 
ALONG THE ITCZ FROM 11N93W TO THE EQUATOR AT 95W. SCATTERED 
MODERATE ISOLATED STRONG CONVICTION ALONG THE ITCZ IS W OF THE 
TROUGH FROM 4N-7N BETWEEN 90-94W. A 1021 MB HIGH PRES IS 
CENTERED NEAR 28N132W WITH RIDGE FROM THE HIGH TO 21N116W. 
BROKEN/OVERCAST STRATOCUMULUS CLOUDS COVER THE AREA N OF 17N W 
OF 115W. 

$$
DGS