000
AXPZ20 KNHC 011007
TWDEP 

TROPICAL WEATHER DISCUSSION
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
1005 UTC THU APR 01 2010

TROPICAL WEATHER DISCUSSION FOR THE EASTERN PACIFIC OCEAN FROM 
THE EQUATOR TO 32N...EAST OF 140W. 

BASED ON 0600 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY THROUGH 
0900 UTC.

...ITCZ...
AXIS ANALYZED ALONG 05N77W TO 
05N82W TO 04N90W TO 07N113W TO 07N126W TO 04N140W. SCATTERED 
MODERATE TO STRONG CONVECTION WAS WITHIN 120 NM OF AXIS E OF 
83W. SCATTERED MODERATE TO STRONG CONVECTION WAS WITHIN 90 NM OF 
AXIS W OF 111W. 

...DISCUSSION...
RELATIVELY SHARP LONG WAVE UPPER LEVEL TROUGH EXTENDING N TO S 
ALONG 115-120W N OF 35N...WITH MEAN BASE OF TROUGH THEN 
EXTENDING S TO 26N119W. LINGERING MID TO UPPER LEVEL TROUGH 
EXTENDED FROM TROUGH BASE SW TO TUTT LOW NEAR 17N140W. UPPER 
LEVEL RIDGE WAS TO THE SE OF BOTH FEATURES...EXTENDING FROM NEAR 
03N102W N AND NW TO 20N E OF 120W. MERGED SUBTROPICAL AND MID 
LATITUDE JETSTREAM 65-90 KT EXTENDED FROM NEAR 20N127W NE INTO 
NW MEXICO...TRANSPORTING AMPLE UPPER MOISTURE. PERSISTENT 
MODERATE TO STRONG CONVECTION PULSING NEAR THE ITCZ BETWEEN 110W 
AND 130W WAS AIDING IN MAINTAINING W PERIPHERY OF UPPER 
RIDGE...AS WELL AS A NEGATIVE TILT UPPER TROUGH FROM SE OF THE 
TUTT LOW TO 08N134W.

UPPER TROUGH MOVING ACROSS W COAST OF U.S. WILL PROGRESS EWD 
THROUGH SAT MORNING THEN LIFT N OVER E COAST RIDGE SAT 
AFTERNOON. MID TO UPPER TROUGH FROM NRN BAJA TO TUTT LOW WILL 
LINGER DURING THIS TIME BUT BE FORCED SE TO SRN BAJA. THIS WILL 
FORCE A DYING FRONTAL TROUGH CURRENTLY ENTERING N PORTIONS OF 
AREA SE AS WELL AND MAINTAIN STRONG LLVL CONVERGENCE WITHIN 10 
DEGREES N OF ITCZ BETWEEN 110W AND 140W...AND ACTIVE 
CONVECTION...THROUGH THE FORECAST PERIOD.  

ELSEWHERE AT THE SURFACE...
STATIONARY 1032 MB HIGH PRES WELL NW OF BASIN HAS BROAD RIDGE 
EXTENDING SE AND BRIDGING OVER DYING FRONTAL TROUGH TO JUST OFF 
THE S TIP OF BAJA. TIGHT PRES GRADIENT BETWEEN ITCZ AND RIDGE W 
OF 125W WAS PRODUCING NE TRADES 20-25 KT S OF 28N WHICH WILL 
EXPAND E TO 120W OVER NEXT 36-48 HOURS. GALE CENTER ALONG 
CENTRAL CALIFORNIA COAST WILL MOVE E-SE AND QUICKLY WEAKEN 
THROUGH TONIGHT AND COMBINE WITH 1032 MB HIGH TO SHIFT 20-30 KT 
NW WINDS INTO FAR NE PORTIONS OF AREA...REACHING 28N E OF 124W 
THIS EVENING...AND SPREADING INTO NRN GULF OF CALIFORNIA. LARGE 
LONG PERIOD NW SWELL WILL CONTINUE TO COMBINE WITH NE TRADES TO 
PRODUCE MIXED SEAS OF 10-15 FT AND HIGHER ACROSS MUCH OF THE 
AREA OF 120W AND N OF 10N THROUGH THE PERIOD. S OF 10N...SRN 
HEMI SW SWELL WILL MERGE WITH THIS NW SWELL TO MAINTAIN SEAS 8-9 
FT. 

NARROW PLUME OF GAP WINDS THROUGH GULF OF PAPAGAYO HAVE EXTENDED 
W-SW TO NEAR 08N94W OVERNIGHT...AND WILL HAVE DIURNAL/ NOCTURNAL 
PULSING PATTERNS THROUGHOUT NEXT FEW DAYS...AND EVENTUALLY 
BECOME BELOW 20 KT BY LATE FRI.

FOR ADDITIONAL INFORMATION PLEASE VISIT 
HTTP://WWW.HURRICANES.GOV/MARINE

$$
STRIPLING