000
AXPZ20 KNHC 260950
TWDEP 

TROPICAL WEATHER DISCUSSION 
NWS NATIONAL HURRICANE CENTER MIAMI FL
1005 UTC TUE JUN 26 2012

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 0600 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY THROUGH
0915 UTC.

...INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH...
MONSOON TROUGH EXTENDS FROM 10N85W TO 11N110W TO 07N115W. ITCZ 
EXTENDS FROM 11N117W TO 06N130W TO BEYOND 05N140W.  SCATTERED 
MODERATE CONVECTION WITHIN 120 NM S OF AXIS E OF 97W.  ISOLATED 
MODERATE CONVECTION WITHIN 90 NM N OF AXIS FROM 117W-122W.

...DISCUSSION...
DEEP LAYERED TROUGH SPLITS RIDGE INTO TWO ANTICYCLONES...ONE AT 
18N131W AND THE SECOND AT 24N115W.  REGION UNDER RIDGE REMAINS 
DRY AND STABLE WITH LITTLE OR NO SIGNIFICANT CONVECTION NOTED.
STEADY E FLOW ON SOUTHERN PERIPHERY OF RIDGE BRINGS ABUNDANT 
MOISTURE ALONG MONSOON TROUGH...BUT ONLY ISOLATED MODERATE 
CONVECTION WITHIN 90 NM OF TROUGH FROM 117W TO 122W IS NOTED. 
ANTICYCLONE ALOFT OVER NW CARIBBEAN PRODUCING REGION OF MODERATE 
DIVERGENCE OVER GUATEMALA AND SOUTHERN YUCATAN PROMPTING LARGE 
CLUSTER OF DEEP CONVECTION WHICH HAS SO FAR REMAINED INLAND.
WITH AN ABSOLUTE LACK OF UPLIFTING MECHANISM AND DRY STABLE AIR 
MASS...E PAC REMAINS MORE TRANQUIL THAN WOULD BE EXPECTED BY 
THIS TIME OF THE YEAR.   

...ELSEWHERE AT THE SURFACE...
BROAD HIGH PRES CENTER 1034 MB WELL NW OF E PAC EXTEND RIDGE TO 
20N120W.  ONLY THE SURFACE REFLECTION OF DEEP LAYERED TROUGH 
MENTIONED ABOVE SCRAPES N SECTION OF BASIN W OF 125W WITH ONLY A 
MODERATE BREEZE ASSOCIATED WITH IT.  PRESSURE OF RIDGE AGAINST 
WEAK TROUGH OVER BAJA CALIFORNIA PENINSULA PROMPTS FRESH NW 
BREEZE AND SEAS TO 8 FT ALONG COAST N OF 24N E OF 119W THROUGH 
LATE TUE.

$$
WALLY BARNES