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Eastern Pacific Tropical Weather Discussion (Text)

000
AXPZ20 KNHC 242151
TWDEP 

TROPICAL WEATHER DISCUSSION                                    
NWS NATIONAL HURRICANE CENTER MIAMI FL                       
2205 UTC THU JUL 24 2014

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 1800 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY THROUGH 
2145 UTC.

....SPECIAL FEATURES...                                         
A 1007 MB LOW PRES IS CENTERED NEAR 12N132W MOVING W TO WNW AT 
10 KT. SATELLITE IMAGERY SHOWED A CLUSTER OF SCATTERED TO NUMEROUS 
MODERATE TO STRONG CONVECTION WITHIN 150 NM S SEMICIRCLE OF THE 
LOW CENTER. ENVIRONMENTAL CONDITIONS APPEAR CONDUCIVE FOR 
ADDITIONAL DEVELOPMENT AND THIS SYSTEM IS EXPECTED TO BECOME A 
TROPICAL DEPRESSION DURING THE NEXT DAY OR TWO WHILE IT MOVES W 
OR WNW AT AROUND 10 KT. THE LATEST NHC TROPICAL WEATHER OUTLOOK 
GIVES THIS LOW PRES AREA A HIGH CHANCE OF DEVELOPING INTO A 
TROPICAL CYCLONE DURING THE NEXT 48 HOURS. 

...TROPICAL WAVES...                                           
TROPICAL WAVE EXTENDS FROM SOUTH-CENTRAL MEXICO INTO THE E 
PACIFIC REGION ALONG 100W/101W N OF 09N MOVING W AT 15 KT OVER 
THE PAST 24 HOURS. SCATTERED MODERATE ISOLATED STRONG 
CONVECTION WAS NOTED FROM 09N TO 15N BETWEEN 92W AND 103W. 

TROPICAL WAVE IS ALONG 110W FROM 09N TO 20N MOVING W AT 15 KT. 
SCATTERED MODERATE CONVECTION WAS NOTED WITHIN 120 NM EITHER 
SIDE OF THE WAVE AXIS FROM 10N TO 15N. 

WEAK TROPICAL WAVE EXTENDS FROM 19N122W TO 11N124W MOVING W AT 
15-20 KT OVER THE PAST 24 HOURS. A 1009 MB LOW WAS NOTED ALONG 
THE WAVE AXIS NEAR 14.5N123W. SCATTERED MODERATE CONVECTION WAS 
NOTED WITHIN 120 NM OF THE LOW IN THE S SEMICIRCLE. 

...INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH...            
MONSOON TROUGH EXTENDS FROM 08N83W TO 08N100W TO 15N120W TO 
LOW PRES NEAR 15N124W 1009 MB TO LOW PRES NEAR 12N132W 1007 MB TO 
BEYOND 10N140W. SCATTERED MODERATE FROM 05N TO 09N BETWEEN 85W 
AND 92W AND FROM 06N TO 10N BETWEEN 100W AND 106W. SCATTERED 
MODERATE FROM 09N TO 12N BETWEEN 105W AND 109W AND ELSEWHERE 
FROM 09N TO 14N W OF 130W.

...DISCUSSION...                                                
AN UPPER LEVEL TROUGH REMAINS ACROSS THE NORTH-CENTRAL PORTION 
OF THE DISCUSSION AREA N OF 15N W OF 125W. THE MEAN AXIS EXTENDS 
FROM A CYCLONIC CIRCULATION NEAR 28N132W TO 18N136W. MODERATE 
SUBSIDENCE WITH DRY AND STABLE AIR AT THE MIDDLE AND UPPER 
LEVELS IS OVER MUCH OF THE AREA N OF 20N W OF 120W. UPPER LEVEL 
DIFFLUENT FLOW IS ENHANCING CONVECTION ALONG THE MONSOON TROUGH 
MAINLY W OF 120W. A LARGE UPPER LEVEL ANTICYCLONIC CIRCULATION 
IS CENTERED OVER THE SW CONUS NEAR 35N108W WITH THE ASSOCIATED 
RIDGE AXIS EXTENDING FROM THE ANTICYCLONE INTO THE E PACIFIC 
ACROSS NORTHERN BAJA CALIFORNIA TO NEAR 22N118W. AN UPPER 
CYCLONIC CIRCULATION IS CENTERED NEAR 17N105W WITH A TROUGH 
EXTENDING SW TO NEAR 11N112W. A DIFFLUENT PATTERN ALOFT AHEAD OF 
THE TROUGH AXIS IS HELPING TO INDUCE CONVECTION E OF 110W. 

GULF OF PAPAGAYO...STRONG TO NEAR GALE FORCE TRADE WINDS OVER 
THE SW CARIBBEAN CONTINUE TO PULSE THROUGH THE GULF OF PAPAGAYO 
THIS MORNING. AN EARLIER ASCAT PASS CAPTURED AN AREA OF 20-25 KT 
WINDS IN THE REGION. THESE WINDS WILL PULSE AGAIN TO 20-25 KT 
TONIGHT INTO FRI AND AGAIN FRI NIGHT INTO SAT. SEAS WILL BUILD 
TO 9 FT DURING EACH PULSE .   

GULF OF TEHUANTEPEC...ANOTHER PULSE OF NLY WINDS OF 20-25 KT IS 
EXPECTED TO BLOW THROUGH THE GULF OF TEHUANTEPEC TONIGHT INTO 
EARLY FRI...AND AGAIN FRI NIGHT INTO SAT. SEAS SHOULD MAXIMIZE 
AT AROUND 8 FT WITH EACH PULSE. 

OTHERWISE A SURFACE RIDGE DOMINATES THE REMAINDER OF THE AREA N 
OF 15N W OF 115W. PRES GRADIENT BETWEEN THE SOUTHERN PERIPHERY 
OF THE RIDGE AN THE LOW PRES LOCATED NEAR 12N130W IS PRODUCING 
AN AREA OF 20-25 KT TRADE WINDS FROM 13N TO 18N W OF 125W WITH 
SEAS TO 10 FT. SCATTEROMETER DATA CONFIRMED THE PRESENCE OF 
THESE WINDS. THIS WEATHER PATTERN IS FORECAST TO PERSIST OVER 
THE NEXT COUPLE OF DAYS. IN ADDITION...PRES GRADIENT BETWEEN THE 
RIDGE AND A SURFACE TROUGH ACROSS THE GULF OF CALIFORNIA IS 
PRODUCING A SMALL AREA OF 20-25 KT NW WINDS N OF 27N BETWEEN 117W 
AND 121W BASED ON AN EARLIER ASCAT PASS. WINDS ARE EXPECTED TO 
DIMINISH TO 20 KT OR LESS IN ABOUT 12-18 HOURS. 

$$ 
COBB