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Eastern Pacific Tropical Discussion

Active Tropical Systems Basin Outlooks Satellite
Eastern Pacific Basin Tropical Discussion
 
048 
AXPZ20 KNHC 300915
TWDEP 

TROPICAL WEATHER DISCUSSION                                      
NWS NATIONAL HURRICANE CENTER MIAMI FL                         
1005 UTC TUE SEP 30 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 0600 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY THROUGH 
0900 UTC.

...SPECIAL FEATURES...                                     
TROPICAL STORM RACHEL NEARLY STATIONARY LOCATED NEAR 23.3N 
117.5W 1005 MB AT 0900 UTC. MAXIMUM SUSTAINED WINDS 35 KT GUSTS 
45 KT. STEADY WEAKENING WILL CONTINUE TODAY...WITH RACHEL 
EXPECTED TO BECOME A REMNANT LOW DURING THE NEXT 24 HOURS AS IT 
SLOWLY DRIFTS WEST. SCATTERED MODERATE CONVECTION WITHIN 120 NM 
N SEMICIRCLE. SEE THE LATEST NHC FORECAST/ADVISORY UNDER 
AWIPS/WMO HEADERS MIATCMEP3/WTPZ23 FOR MORE DETAILS.

1007 MB LOW PRES NEAR 13N97W REMAINS POORLY ORGANIZED ALONG THE 
MONSOON TROUGH ROUGHLY 300 NM SE OF ACAPULCO MEXICO. THIS IS IN 
THE AREA WHERE A PAIR OF TROPICAL WAVES HAVE ACCUMULATED OVER 
THE PAST SEVERAL DAYS...ENHANCING VORTICITY ALONG THE MONSOON 
TROUGH. SCATTERED MODERATE CONVECTION FLARING WITHIN 150 NM OF 
THE LOW CENTER. GLOBAL MODELS CONTINUE TO INDICATE THAT THIS 
BROAD LOW PRES WILL SLOWLY BECOME BETTER ORGANIZED OVER THE NEXT 
SEVERAL DAYS AS IT DRIFTS TO THE WNW PARALLELING THE COAST OF 
MEXICO. THE LOW PRES HAS A MEDIUM CHANCE OF DEVELOPING INTO A 
TROPICAL CYCLONE WITHIN THE NEXT 48 HOURS AND A HIGH CHANCE OF 
DEVELOPING INTO A TROPICAL CYCLONE OVER THE NEXT 3 TO 5 DAYS. 
THIS SYSTEM MAY PRODUCE LOCALLY HEAVY RAINS OVER PORTIONS OF 
SOUTHERN MEXICO THAT COULD CAUSE FLASH FLOODS AND MUD SLIDES.

...INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH...           
THE MONSOON TROUGH EXTENDS FROM 09N83W TO 13N92W TO LOW PRES 
1007 MB NEAR 13N97W TO 12N109W TO 14N115W TO 13N130W. ITCZ 
EXTENDS FROM 13N130W TO 12N140W. SCATTERED MODERATE ISOLATED 
STRONG CONVECTION WITHIN 180 NM EITHER SIDE OF THE TROUGH AXIS 
BETWEEN 85W AND 107W.

...DISCUSSION...                                            
MARINE GUIDANCE SUGGESTS INCREASING FRESH SW WIND FLOW S OF THE 
MONSOON TROUGH AXIS BETWEEN 100W AND 115W LATE TONIGHT THROUGH 
THU IN ASSOCIATION WITH TROPICAL LOW PRES DEVELOPMENT EXPECTED 
NEAR 16N102W. SW WIND WAVES WILL ADD TO 6-8 FT SEAS ALREADY IN 
PLACE FROM CROSS-EQUATORIAL SW SWELL AND BUILD SEAS TO 8-10 FT 
FROM 07N TO 13N BETWEEN 98W AND 117W...AND ALSO N OF 13N BETWEEN 
98W AND 103W.
 
$$
MUNDELL