000
AXPZ20 KNHC 090914
TWDEP 

TROPICAL WEATHER DISCUSSION
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
1005 UTC SUN AUG 09 2009

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.

...TROPICAL WAVES...

TROPICAL WAVE ALONG 84W N OF 06N MOVING W AT 15 KT. THIS WAVE 
SHOWS A MAXIMUM IN PRECIPITABLE WATER ALONG THE WAVE AXIS. THERE 
IS NO CONVECTION ASSOCIATED WITH THE WAVE AT THIS TIME OVER THE 
PACIFIC OCEAN. ISOLATED CONVECTION IS OVER CENTRAL AMERICA NEAR 
THE WAVE AXIS.

TROPICAL WAVE ALONG 100W N OF 06N MOVING W AT 15 KT. WIDELY 
SCATTERED MODERATE CONVECTION IS NOTED WITHIN 150 NM EAST OF THE 
WAVE AXIS. THE CONVECTION APPEARS TO BE MORE RELATED TO MIDDLE 
AND UPPER LEVEL FEATURES RATHER THAN ORGANIZED BY THE LOW LEVEL 
CIRCULATION ASSOCIATED WITH THE WAVE.

TROPICAL WAVE ALONG 127W/128W FROM 06N TO 16N MOVING W AT 10 KT.
AN INVERTED-V LOW CLOUD SIGNATURE IS NOTED. SCATTERED MODERATE 
CONVECTION IS WITHIN 100 NM EITHER SIDE OF THE AXIS FROM 12N TO 
15N. WEAK CYCLONIC FLOW IS NOTED IN THE LOW CLOUD MOTIONS. 

...ITCZ...

THE INTERTROPICAL CONVERGENCE ZONE IS ALONG THE LINE...05N77W TO 
07N110W TO 07N140W. SCATTERED MODERATE WITH ISOLATED STRONG 
CONVECTION IS WITHIN 60 NM OF THE POINT 03.5N78.5W. SCATTERED 
MODERATE CONVECTION IS WITHIN THE AREA 45 NM EITHER SIDE OF A 
LINE FROM 03N90W TO 07.5N92W TO 06N98.5W.

...DISCUSSION...

DEEP LAYER ANTICYCLONIC FLOW IS WEST OF A LINE THROUGH 27N140W 
TO 20N135W TO THE ITCZ NEAR 135W. THIS ANTICYCLONE EXTENDS WEST 
OF THE AREA AND IS PART OF THE DIFFLUENT FLOW FROM FELICIA NOW 
LOCATED JUST WEST OF THE AREA NEAR 20N144W. 

ELSEWHERE A LARGE DEEP LAYER TROUGH IS NORTHWEST OF A LINE 
THROUGH 32N110W TO 25N117W TO 18N120W TO 11N135W. TWO CYCLONIC 
CIRCULATION CENTERS ARE WITHIN THIS TROUGH. ONE IS CENTERED NEAR 
22N120W AND THE OTHER NEAR 25N127W. THIS AREA IS DRY AND CLOUD 
FREE IN THE MIDDLE AND UPPER LEVELS WITH BROKEN TO OVERCAST 
STRATOCUMULUS IN THE LOWER LEVELS.

ANOTHER DEEP LAYER TROUGH EXTENDS FROM TEXAS ACROSS CENTRAL 
MEXICO AND OVER THE PACIFIC OCEAN NORTH OF THE ITCZ FROM 98W TO 
115W. THIS AREA IS MOIST IN THE DEEP LAYER AND BECAUSE OF THE 
COOLER TEMPERATURES ALOFT SOME CONVECTION IS WITHIN THE TROUGH 
REGION. MOST OF THE ACTIVITY IS ALONG THE COAST OF MEXICO AND IS 
INFLUENCED BY LAND SEA INTERACTIONS AND ALSO INTERACTION WITH 
THE MOUNTAINS JUST INLAND FROM THE COAST OF MEXICO.

BETWEEN THE TWO TROUGH MENTIONED ABOVE A NARROW SHARP RIDGE IS 
OBSERVED. 

THE AREA EAST OF 98W IS BROAD ANTICYCLONIC FLOW WITH WEAK 
DIFFLUENCE ALOFT AND SCATTERED AREAS OF CONVECTION. WIDESPREAD 
MULTI LEVEL CLOUDS ARE OBSERVED IN THIS AREA. MOST OF THE 
CONVECTION IS NEAR THE ITCZ. AN AREA REMOVED FROM THE ITCZ IS 
SCATTERED MODERATE TO STRONG CONVECTION WITHIN 90 NM OF THE 
POINT 13.5N93W.

MODERATE SURFACE RIDGE IS NORTH OF 18N WEST OF 115W. WEAK 
SURFACE LOW WITH 1010 MB CENTRAL PRESSURE IS NEAR 14.5N119W AND 
IS MOVING WNW 10 KT. SCATTERED MODERATE TO STRONG CONVECTION IS 
WITHIN 60 NM OF THE CENTER. ELSEWHERE BROAD TROUGH IS ANALYZED 
AT THE SURFACE.

GAP NE TO E WINDS OF 20 KNOTS OCCASIONALLY TO 25 KNOTS IN THE 
GULF OF PAPAGAYO REGION EXTENDING WEST TO NEAR 92W WILL CONTINUE 
THROUGH THE NEXT COUPLE OF DAYS.

$$
LL