000
AXPZ20 KNHC 080922
TWDEP 

TROPICAL WEATHER DISCUSSION
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
1005 UTC WED JUL 08 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.

...SPECIAL FEATURE...
BLANCA HAS BEEN DOWNGRADED TO A TROPICAL DEPRESSION AND IS 
CENTERED NEAR 20.8N 119.0W AT 0900 UTC OR OR ABOUT 490 NM WSW OF 
THE SOUTHERN TIP OF BAJA CALIFORNIA MOVING WNW OR 295 DEG AT 12 
KT. MAXIMUM SUSTAINED WIND SPEED IS 30 KT WITH GUSTS TO 40 KT. 
MINIMUM PRESSURE IS 1004 MB. SEE LATEST NHC FORECAST/ADVISORY 
UNDER AWIPS/WMO HEADERS MIATCMEP3/WTPZ33 KNHC FOR MORE DETAILS. 
CONVECTION NEAR BLANCA IS RAPIDLY DECREASING AND BLANCA IS 
FORECAST TO CONTINUE TO MOVE OVER COOLER WATERS AND THE FORECAST 
CALLS FOR TO BECOME A REMNANT LOW TONIGHT AND DISSIPATE FRI 
NIGHT.

...TROPICAL WAVES...
TROPICAL WAVE N OF 5N TO THE COAST OF EL SALVADOR ALONG 88W/89W 
MOVING W 15 KT. EARLIER CONVECTION ASSOCIATED WITH THE WAVE HAS
DISSIPATED.

TROPICAL WAVE FROM 2N-14N ALONG 101W MOVING W 10-15 KT. A LARGE 
AREA OF MODERATE TO STRONG CONVECTION IS W OF THE WAVE FROM
5N-13N BETWEEN 105W AND 110W. THE CONVECTION IS MAINLY 
ASSOCIATED WITH THE ITCZ AND UPPER LEVEL DIFFLUENT FLOW.

TOPICAL WAVE FROM 2N-14N ALONG 116W. SCATTERED CONVECTION WITH 
THE WAVE IS ALONG THE ITCZ. 

...ITCZ...
AXIS IS ALONG 7N78W 8N110W 9N120W 6N140W. SCATTERED MODERATE TO 
STRONG CONVECTION FROM 05N-13N BETWEEN 105W-110W. SCATTERED 
MODERATE TO STRONG CONVECTION WITHIN 45 NM EITHER SIDE OF AXIS 
FROM 114W-118W.

...DISCUSSION...
AN UPPER LEVEL CYCLONIC CIRCULATION IS CENTERED NEAR 20N130W.
SOME UPPER LEVEL MOISTURE IS ALONG THE PERIPHERY OF THE CYCLONIC 
CIRCULATION FROM 26N124W TO 23N132W 18N133W. EXCEPT FOR THE 
MOISTURE MOVING AROUND THE CYCLONIC CIRCULATION STRONG 
SUBSIDENCE WITH DRY STABLE AIR AT THE MIDDLE AND UPPER LEVELS OF 
THE ATMOSPHERE COVERS THE AREA N OF THE ITCZ W OF 120W. AN UPPER 
LEVEL ANTICYCLONIC CIRCULATION CENTERED OVER NW MEXICO NEAR 
29N111W A RIDGE SE OF THE ANTICYLONE TO 29N97W AND W OF THE 
CIRCULATION TO 28N130W. TROPICAL DEPRESSION BLANCA IS MOVING WNW 
AROUND THE PERIPHERY OF THIS RIDGE. ANOTHER UPPER LEVEL 
CYCLONIC CIRCULATION IS OFF THE COAST OF MEXICO NEAR 17N104W.
UPPER LEVEL ANTICYLONE CIRCULATION THAT HAS BEEN OVER THE SW 
CARIBBEAN THE PAST SEVERAL DAYS HAS SHIFTED W IS NOW CENTERED
OVER GUATEMALA. UPPER LEVEL DIFFLUENT FLOW E OF 110W IS 
ENHANCING CONVECTIVE ACTIVITY ALONG THE ITCZ AND THE TROPICAL
WAVE ALONG 100W.

SURFACE RIDGE EXTENDS FROM 32N135N TO 22N110W. BROKEN TO 
OVERCAST STRATOCUMULUS CLOUDS BLANKET THE AREA N OF 15N W OF 
120W.

LARGE SWELLS FROM THE SOUTHERN HEMISPHERE CONTINUE TO CROSS THE 
EQUATOR OVER THE S PORTION OF THE DISCUSSION AREA. THESE 
CONDITIONS ARE EXPECTED TO GRADUALLY SUBSIDE DURING THE NEXT 
COUPLE OF DAYS.

$$
GR