000
AXPZ20 KNHC 120926
TWDEP 

TROPICAL WEATHER DISCUSSION 
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
1005 UTC WED MAY 12 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...

ITCZ AXIS ALONG 06N83W TO 08N117W TO 06N140W. SCATTERED MODERATE 
TO STRONG CONVECTION IS FROM 01N TO 07N E OF 82W. SCATTERED 
MODERATE CONVECTION IS WITHIN 120 NM S OF THE AXIS BETWEEN 90W 
AND 98W AND WITHIN 150 NM OF THE AXIS BETWEEN 111W AND 131W. 
SCATTERED MODERATE ISOLATED STRONG CONVECTION IS WITHIN 150 NM N 
OF THE AXIS BETWEEN 124W AND 131W. SCATTERED MODERATE CONVECTION 
IS WITHIN 150 NM OF THE AXIS W OF 134W.

...DISCUSSION...

AN UPPER LEVEL TROUGH EXTENDS SW INTO THE DISCUSSION AREA NEAR 
32N113W TO 20N122W. PLENTIFUL MIDDLE TO UPPER LEVEL MOISTURE IS 
NOTED WITHIN ROUGHLY 600 NM E OF A LINE FROM 30N106W TO 15N120W 
THAT CONTINUES TO ADVECT NORTHEASTWARD BETWEEN 105W AND 115W... 
INCLUDING ACROSS CENTRAL MEXICO. MAINLY DRY AIR IS IN PLACE W OF 
THE TROUGH AXIS TO 140W. A REINFORCING UPPER LEVEL TROUGH AXIS 
EXTENDS FROM AN UPPER LEVEL CYCLONE CENTERED OVER NE UTAH TO THE 
SW OVER THE LOS ANGELES BASIN AND INTO THE DISCUSSION AREA NEAR 
32N120W TO 25N138W.

AN UPPER LEVEL TROPICAL ANTICYCLONE IS POSITIONED NEAR 06N135W 
WITH A RIDGE EXTENDING ALONG 06N BETWEEN 110W AND 140W. 
CONVECTION IS BEING ENHANCED ALONG AND S OF THE RIDGE UNDER 
UPPER DIFFLUENCE ALONG THE ITCZ W OF 110W. ANOTHER UPPER LEVEL 
ANTICYCLONE IS CENTERED NEAR 09N100W. MIDDLE TO UPPER LEVEL 
MOISTURE IS BEING ADVECTED FROM THE ITCZ WITHIN THE NW-N 
PERIPHERY OF THE ANTICYCLONE TO THE NE INTO CENTRAL MEXICO. 
CONVECTION IS ALSO BEING ENHANCED ALONG THE ITCZ BETWEEN 90W AND 
98W SE OF THE ANTICYCLONE CENTER. 

A DEEP UPPER LEVEL TROUGH EXTENDS FROM WESTERN NICARAGUA ALONG 
88W SOUTHWARD TO THE EQUATOR. AN UPPER LEVEL CYCLONE HAS CLOSED 
OFF WITHIN THE TROUGH NEAR 04N88W WITH VERY DRY AIR NOTED ACROSS 
THIS AREA EXCEPT E OF THE TROUGH AXIS WHERE CONVECTION IS BEING 
ENHANCED ALONG THE ITCZ E OF 84W BETWEEN THE TROUGH AXIS AND AN 
UPPER LEVEL RIDGE EXTENDING NW FROM NORTHERN COLOMBIA OVER THE 
SW CARIBBEAN SEA TO EASTERN NICARAGUA.
 
AT THE SURFACE...A BROAD RIDGE AXIS DOMINATES THE MAJORITY OF 
THE DISCUSSION AREA WITH AXIS MEANDERING FROM NEAR 32N130W TO 
14N105W. NE TRADES IN THE 20-25 KT ARE SW OF THE RIDGE AXIS FROM 
08N TO 27N W OF 122W. AN EARLIER 12/0600 UTC ASCAT PASS AND A 
12/0220 UTC WINDSAT PASS CONFIRMS THIS AREA. 20-30 KT NW-N WINDS 
ARE OCCURRING N OF 22N BETWEEN 110W AND 122W. NE AND NW SWELLS 
ARE THE PRIMARY SWELLS OVER THE WATERS WHERE THE TRADES AND NW-N 
WINDS ARE OCCURRING WITH A SERIES OF LONG PERIOD CROSS 
EQUATORIAL SOUTHERLY SWELL GROUPS DOMINATING THE REMAINDER OF 
THE DISCUSSION AREA. THE HIGHEST COMBINED SEAS OF UP TO 12 FT 
ARE OCCURRING ALONG 20N W OF 132W.

GAP WINDS...NE TO E WINDS AT 20 TO 25 KT ARE SURGING OVER THE 
GULF OF PAPAGAYO AND DOWNWIND TO NEAR 09N90W AND ARE EXPECTED TO 
PERSIST FOR AT LEAST THE NEXT 48 HOURS.

$$
HUFFMAN