000
AXPZ20 KNHC 220902
TWDEP 

TROPICAL WEATHER DISCUSSION    
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
1005 UTC THU JUL 22 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 
0815 UTC.

...ITCZ...

THE INTERTROPICAL CONVERGENCE ZONE WAS ANALYZED ALONG 14N90W TO 
11N100W TO 10N116W TO 08N128W TO 11N140W. CLUSTERS OF SCATTERED 
MODERATE CONVECTION IS WITHIN 180 NM EITHER SIDE OF AXIS E OF 
100W. SCATTERED MODERATE/ISOLATED STRONG CONVECTION IS WITHIN 60 
NM RADIUS OF 07N79W WITH CLUSTERS OF SIMILAR CONVECTION WITHIN 
120 NM OF MEXICO COAST S OF 23N E OF 100W. 

...DISCUSSION...

AN UPPER LEVEL RIDGE EXTENDS ACROSS FAR W PORTIONS OF THE AREA 
FROM AN UPPER HIGH LOCATED NE OF THE BIG ISLAND OF HAWAII 
CONTINUING NE TO NEAR 31N138W. A SECOND HIGH WAS CENTERED OVER 
THE SUB TROPICS NEAR 20N119W. A NARROW AND ELONGATED MID TO 
UPPER TROUGH SEPARATES THESE TWO HIGHS EXTENDING INTO THE AREA 
NEAR 32N130W TO A MID/UPPER LEVEL LOW NEAR 19N136W. DRY STABLE 
UPPER LEVEL CONDITIONS PREVAIL ACROSS MOST OF THE AREA N OF 
15N W OF 115W. TO THE NE OF THE UPPER HIGH NEAR 20N119W IS AN 
ELONGATED UPPER LOW CENTERED ALONG THE W COAST OF BAJA 
CALIFORNIA NEAR 28N114W AND ENCOMPASSING ALL OF THE BAJA 
PENINSULA AND A PORTION OF THE GULF OF CALIFORNIA ENHANCING THE 
SHOWERS AND THUNDERSTORMS INLAND OVER MEXICO. E OF 110W UPPER 
LEVEL EASTERLIES PREVAIL AND IS ENHANCING CONVECTION OVER MEXICO 
AND OFF THE SW COAST OF MEXICO AND CENTRAL AMERICA. 

A 1037 MB SURFACE HIGH PRES IS CENTERED WELL NW OF THE 
DISCUSSION AREA NEAR 43N147W WITH A RIDGE AXIS EXTENDING THROUGH 
32N139W TO 22N126W. THE RIDGE AXIS IS MARKED BY STABLE AIR AND 
STRATOCUMULUS CLOUDS ESPECIALLY N OF 20N. 

GALE FORCE WINDS ALONG THE PACIFIC NW COAST OF THE U.S. CONTINUE 
TO GENERATE NORTHERLY SWELL TO 9 FT OVER THE DISCUSSION AREA N 
OF 26N BETWEEN 120W AND 134W AND WILL GRADUALLY SUBSIDE TO 8 FT 
LATER THIS MORNING AND BELOW 8 FT LATE THU NIGHT. 

LONG PERIOD CROSS EQUATORIAL SOUTHERLY SWELL OF 8 TO 10 FT LIES 
ACROSS THE S CENTRAL PORTION OF THE FORECAST AREA GENERALLY S OF 
10N BETWEEN 95W AND 130W. THIS SWELL WILL GRADUALLY DECAY BY FRI 
WITH A NEW SURGE OF SE SWELL EXPECTED TO MOVE ACROSS THE EQUATOR 
FRI NIGHT. IN ADDITION...SE TO S WINDS TO 20 KT ARE EXPECTED TO 
CONTINUE TODAY THROUGH FRI IN S CENTRAL WATERS THEN SHIFTING 
TOWARD THE EAST ON SAT. 

$$
PAW