000
AXPZ20 KNHC 310320
TWDEP 

TROPICAL WEATHER DISCUSSION
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
0405 UTC WED MAY 31 2006

TROPICAL WEATHER DISCUSSION FOR THE EASTERN PACIFIC OCEAN FROM 
THE EQUATOR TO 32N...EAST OF 140W. THE FOLLOWING INFORMATION IS 
BASED ON SATELLITE IMAGERY...WEATHER OBSERVATIONS...RADAR...AND 
METEOROLOGICAL ANALYSIS.

BASED ON 0000 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY THROUGH 
0315 UTC.

...SPECIAL FEATURE...

TROPICAL DEPRESSION ALETTA DOWNGRADED TO A NEARLY STATIONARY 
REMNANT LOW PRES 16.3N 103.6W 1008 MB.

...TROPICAL WAVES...

A TROPICAL WAVE ALONG 102W N OF 2N HAS MOVED W 10 KT THE PAST OF 
DAYS. SCATTERED MODERATE ISOLATED STRONG CONVECTION IS NOTED 
WITHIN 30 NM OF THE WAVE AXIS FROM 4N TO 10N.

..ITCZ...

ITCZ AXIS IS CENTERED ALONG...10N80W 9N101W 5N126W 6N140W. 
SCATTERED MODERATE ISOLATED STRONG WITHIN 60 NM EITHER SIDE OF 
LINE 7N84W 9N95W AND WITHIN 150 NM EITHER SIDE OF LINE 4N99W 
8N105W.

...DISCUSSION...

A SHORTWAVE TROUGH LIES ALONG 32N140W 24N140W. A SECOND 
SHORTWAVE LIES ALONG 32N106W 20N96W. AN UPPER ANTICYCLONE IS 
NEAR 11N124W WITH A RIDGE EXTENDING SW TO BEYOND 9N140W. A RIDGE 
ALSO EXTENDS E TO A CREST NEAR 15N98W. THE ASSOCIATED 
ANTICYCLONIC FLOW IS ZONAL ALONG 21W BETWEEN 138W AND 108W. 
RESULTANT DRY UPPER AIR IS INDICATED N OF 20N W OF 104W. DEBRIS 
MOISTURE FROM ITCZ CONVECTION W OF 110W IS ADVECTED N AND NE  
UNDER THE RIDGE AND DRYING ALONG 21N ATTM.

AT THE LOW LEVELS A HIGH PRES IS AT 30N138W 1024 MB WITH RIDGE 
SE TO 18N110W. SCATTERED TO LOCALLY BROKEN STRATOCUMULUS IS 
OBSERVED N OF 16N W OF 120W. 

AN UPPER ANTICYCLONE IS CENTERED OVER S AMERICA AT 11S66W WITH A 
RIDGE EXTENDING NW TO 5N83W. UPPER DIFFLUENCE UNDER THIS RIDGE 
ENHANCED CONVECTION ALONG THE ITCZ E OF 80W WITH THE DEBRIS 
MOISTURE STILL SPREADING NE ACROSS THE W CENTRAL CARIBBEAN. AN 
UPPER TROUGH EXTENDS SW ACROSS CENTRAL AMERICA ALONG 13N83W 
10N88W. 

$$
NELSON