000
AXPZ20 KNHC 301546
TWDEP 

TROPICAL WEATHER DISCUSSION
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
1605 UTC TUE MAY 30 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 1200 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY 
THROUGH 1500 UTC.

...SPECIAL FEATURE...

TROPICAL DEPRESSION ALETTA IS ESTIMATED NEAR 16.0N 103.5W AT 
30/1500 UTC. THE CENTER OF ALETTA WAS LOCATED ABOUT 120 MILES/
195 KM SOUTH OF ZIHUATANEJO MEXICO. ALETTA IS MOVING WEST 5 KT. 
THE ESTIMATED MINIMUM CENTRAL PRESSURE IS 1005 MB. THE MAXIMUM 
SUSTAINED WIND SPEEDS ARE 30 KT WITH GUSTS TO 40 KT. SCATTERED 
TO NUMEROUS STRONG SHOWERS AND THUNDERSTORMS ARE FOUND FROM 14N 
TO 17N BETWEEN 102W AND 104W. SEE LATEST NHC FORECAST/ADVISORY 
UNDER AWIPS/WMO HEADERS MIATCMEP1/WTPZ21 KNHC FOR MORE DETAILS. 

...TROPICAL WAVES...

TROPICAL WAVE ALONG 99W/100W SOUTH OF 13N MOVING WEST 10 KT. 
STRONG SHOWERS AND THUNDERSTORMS ARE FOUND FROM 5N TO 6N
BETWEEN 100W AND 101W. ISOLATED MODERATE SHOWERS TO LOCALLY
STRONG THUNDERSTORMS ARE ELSEWHERE FROM 5N TO 9N BETWEEN
99W AND 102W.

A SURFACE TROUGH IS ALONG 16N110W 12N114W 9N116W MOVING
WEST 10 KT. NUMEROUS STRONG SHOWERS AND THUNDERSTORMS 
HAVE DEVELOPED FROM 12N TO 14N BETWEEN 109W AND 111W. WIDELY
SCATTERED TO SCATTERED MODERATE SHOWERS AND ISOLATED STRONG
THUNDERSTORMS ARE ELSEWHERE FROM 10N TO 15N BETWEEN 107W AND 
115W.

..ITCZ...

ITCZ 6N77W 7N87W 9N95W 11N117W 7N127W 6N140W. ISOLATED MODERATE 
SHOWERS TO LOCALLY STRONG THUNDERSTORMS ARE ELSEWHERE...AWAY FROM
THE 99W/100W TROPICAL WAVE...FROM 4N TO 9N BETWEEN 93W AND 105W. 
ISOLATED MODERATE SHOWERS ARE WITHIN 60 NM OF THE CENTRAL AMERICA
COAST BETWEEN 83W AND 87W...AND FROM 11N TO 15N BETWEEN 88W AND 
99W.

...DISCUSSION...

BROAD UPPER LEVEL ANTICYCLONIC FLOW IS NORTH OF 30N
EAST OF 140W.
 
A FAIRLY FLAT HEIGHT PATTERN COVERS THE EASTERN PACIFIC 
WATERS FROM 20N TO 30N EAST OF 140W...AT LEAST AT THE MIDDLE 
LEVELS OF THE ATMOSPHERE AS SEEN IN THE 30/1200 UTC CIMSS 
SATELLITE DERIVED WIND DATA.

A MIDDLE TO UPPER LEVEL TROUGH IS APPROACHING THE NORTHWESTERN 
CORNER OF THE AREA...NEAR 30N140W...FROM THE NORTHWEST.

MIDDLE TO UPPER LEVEL DRY AIR IS FOUND FROM 20N TO 30N. 
THIS DRY AIR IMPLIES UPPER LEVEL SUBSIDENCE. THE SKIES ARE
CLEAR IN THE MIDDLE AND UPPER LEVELS NORTH OF 20N WITH
MOSTLY OVERCAST STRATOCUMULUS CLOUDS IN THE LOWER LEVELS.

BROAD UPPER LEVEL ANTICYCLONIC FLOW IS SOUTH OF 20N EAST OF 
140W. SOME UPPER LEVEL CLOUDINESS IS OBSERVED SOUTH OF 20N.  
THIS CLOUDINESS IS THE RESULT OF ITCZ PRECIPITATION AND THE 
ADVECTION OF MOISTURE FROM THAT REGION TOWARD 20N.

SURFACE 1025 MB HIGH PRESSURE CENTER IS NEAR 30N134W. A RIDGE 
STRETCHES FROM THIS CENTER TO 26N123W 22N117W 20N110W. BROAD 
ANTICYCLONIC FLOW COVERS THE AREA NORTH OF 14N WEST OF 110W.
   
$$
MT