000
AXPZ20 KNHC 150918
TWDEP 

TROPICAL WEATHER DISCUSSION 
NWS NATIONAL HURRICANE CENTER MIAMI FL
1005 UTC TUE JAN 15 2013

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.

...INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH...
MONSOON TROUGH 9N84W 5N95W TO 06N98W. INTERTROPICAL CONVERGENCE 
ZONE 6N98W 10N125W TO 5N140W. SCATTERED MODERATE CONVECTION 
7N-19N BETWEEN 115W-133W

...DISCUSSION...
UPPER LEVEL TROUGH EXTENDS FROM NORTHERN BAJA CALIFORNIA TO 
32N137W WITH ANOTHER UPPER LEVEL TROUGH OVER THE FAR WESTERN 
PORTION OF THE DISCUSSION AREA FROM 25N135W TO 10N133W. 
MULTI-LAYERED CLOUDS WITH SCATTERED SHOWERS ARE WITHIN 500 NM SE 
OF THE SECOND TROUGH. A 95-110 KT JETSTREAM SE OF THE FIRST 
TROUGH EXTENDS FROM 27N121W TO CENTRAL BAJA CALIFORNIA WHERE 
WINDS INCREASE TO 125-140 KT THEN INTO NORTHERN MEXICO WHERE 
WINDS FURTHER INCREASE TO 175 KT. BROKEN TO OVERCAST MID AND 
HIGH LEVEL CLOUDS ARE WITHIN 600 NM S OF THE JET. MODERATE TO 
STRONG SUBSIDENCE WITH DRY STABLE AIR AT THE MIDDLE AND UPPER 
LEVELS IS WITHIN 400 NM N OF THE JETSTREAM. A NE-SW ORIENTED 
UPPER LEVEL RIDGE EXTENDS FROM THE GULF OF MEXICO ACROSS 
SOUTHERN MEXICO TO 20N100W. STRONG SUBSIDENCE IS SE OF THE RIDGE.

STRONG SURFACE HIGH PRES N  OF THE AREA WITH TIGHT PRES GRADIENT 
ACROSS THE DISCUSSION AREA WITH 20-25 KT ELY WINDS FROM 10N-20N 
W OF 120W...WITH SEAS AS HIGH AS 12 FT.

THE PRES GRADIENT HAS TIGHTENED BETWEEN HIGH PRES OVER THE 
WESTERN U.S. AND LOW PRE OVER CENTRAL MEXICO IS RESULTING IN NLY 
WINDS 20-30 KT ACROSS THE GULF OF CALIFORNIA.

STRONG HIGH PRES BUILDS ACROSS THE GULF OF MEXICO AND TIGHTENS 
THE PRES GRADIENT OVER SOUTHERN MEXICO WED NIGHT RESULTING IN 
STRONG GALE FORCE WINDS THROUGH THE GULF OF TEHUANTEPEC WITH 
WINDS UP TO 40 KT.

$$
DGS