000
AXPZ20 KNHC 280908
TWDEP 

TROPICAL WEATHER DISCUSSION    
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
1005 UTC WED MAR 28 2007

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 0600 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY THROUGH 
0845 UTC.

...ITCZ...

ITCZ AXIS IS CENTERED ALONG 3N77W 9N85W 6N95W 7N110W 6N120W 
6N140W. SCATTERED MODERATE CONVECTION FROM 5N-9N BETWEEN 82W- 
87W. SCATTERED MODERATE WITHIN 60 NM OF AXIS BETWEEN 111W-124W.

...DISCUSSION...

SUBTROPICAL PACIFIC...
A VIGOROUS CLOSED MID/UPPER LOW IS CENTERED OVER THE UTAH/NEVADA 
BORDER TONIGHT AND IS STILL CAUGHT UP JUST ENOUGH IN THE 
WESTERLIES TO PRODUCE A SLOW EWD MOVEMENT. A 125 KT UPPER LEVEL 
JET PLUNGES DOWN THE CALIFORNIA COAST THEN TURNS NE INTO ARIZONA 
AND NEW MEXICO...CARVING OUT A BROAD AREA OF CYCLONIC FLOW OVER 
THE DISCUSSION AREA N OF 24N. THE COLD FRONT WHICH WAS 
ASSOCIATED WITH THIS FEATURE HAS ESSENTIALLY WASHED OUT... 
ALTHOUGH AN ARGUMENT COULD BE MADE THAT THERE IS STILL STRONG 
COLD ADVECTION OCCURRING W OF BAJA CALIFORNIA WITH THE BOUNDARY 
STRETCHING FROM NEAR TUCSON ARIZONA TO MULEGE THEN TO 22N120W. 
STRONG NLY WINDS UP TO 30 KT ARE OCCURRING BEHIND THE FRONT WITH 
A STRONG 1036 MB HIGH BUILDING IN OFF THE CALIFORNIA COAST. THIS 
STRONG HIGH IS ALSO PRODUCING BRISK TRADES ACROSS MUCH OF THE 
AREA W OF 115W.

TROPICAL PACIFIC...
UPPER LEVEL FLOW ACROSS THE TROPICAL PACIFIC IS MAINLY WESTERLY 
WITH A WEAK MID-LEVEL HIGH CENTERED NEAR 20N130W. THE HIGH IS 
TENDING TO PRODUCE A LARGE AREA OF SUBSIDENCE FROM 10N-23N W OF 
110W WITH A BROKEN LOW-LEVEL STRATOCUMULUS FIELD BEING ADVECTED 
W BY THE TRADES. THE LEADING EDGE OF THE SUBSIDENCE FIELD IS 
MARKED BY A WEAK UPPER TROUGH/SHEAR AXIS FROM THE MOUTH OF THE 
GULF OF CALIFORNIA SW TO 10N130W. E OF THIS AXIS THERE IS BROKEN 
CIRRUS BEING PULLED FROM THE ITCZ NE INTO S/CENTRAL MEXICO. 
FARTHER E...A STRONG MID/UPPER LEVEL RIDGE IS ANCHORED OVER 
CENTRAL AMERICA WITH SUBSIDENCE LYING N OF 9N AND S OF 5N...ON 
EITHER SIDE OF THE ITCZ. A CLUSTER OF TSTMS HAS DEVELOPED ALONG 
THE ITCZ JUST SW OF COSTA RICA (SOME OF WHICH APPEARS TO BE 
CLIPPING THE OSA PENINSULA)...BUT OVERALL CONDITIONS ALONG THE 
COAST ARE FAIRLY BENIGN. AS IS USUAL OVERNIGHT...A FEW CLOUDS 
ARE SPILLING OVER THE MOUNTAINS AND MOVING OFF THE PACIFIC COAST 
BETWEEN NICARAGUA AND ACAPULCO MEXICO...BUT THESE ARE EXPECTED 
TO DISSIPATE DURING THE DAY.

$$
BERG