000
AXPZ20 KNHC 130922
TWDEP 

TROPICAL WEATHER DISCUSSION 
NWS NATIONAL HURRICANE CENTER MIAMI FL
1005 UTC SUN JAN 13 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...
THE MONSOON TROUGH 4N78W 7N85W TO 6N105W. THE INTERTROPICAL 
CONVERGENCE ZONE AXIS FROM 5N105W 9N117W 6N130W TO 7N140W. NO 
SIGNIFICANT CONVECTION.

...DISCUSSION...
UPPER LEVEL RIDGE ACROSS THE FAR WESTERN PORTION OF THE AREA 
WITH AXIS FROM 30N140W TO 16N125W. A BROAD UPPER LEVEL TROUGH IS 
E OF THE RIDGE N OF 25N E OF 125W. A 90-110 KT JETSTREAM ALONG 
THE BASE OF THE TROUGH EXTENDS FROM 25N130W TO 25N120W WHERE 
WINDS INCREASE TO 125-150 KT THEN ACROSS SOUTHERN BAJA 
CALIFORNIA INTO MEXICO. OVERCAST MID AND HIGH LEVEL CLOUDS ARE 
WITHIN 450 NM S OF THE JET. MODERATE TO STRONG SUBSIDENCE WITH 
DRY STABLE AIR AT THE MIDDLE AND UPPER LEVELS IS N OF THE 
JETSTREAM. A NE-SW ORIENTED UPPER LEVEL RIDGE EXTENDS FROM THE 
GULF OF MEXICO ACROSS SOUTHERN MEXICO TO 10N107W. STRONG 
SUBSIDENCE IS SE OF THE RIDGE.

STRONG SURFACE HIGH PRES NW OF THE AREA WITH STRONG PRES 
GRADIENT ACROSS THE DISCUSSION AREA WITH 20-25 KT ELY WINDS N OF 
8N W OF 120W...WITH SEAS AS HIGH AS 15 FT IN NLY SWELL.

THE PRES GRADIENT TIGHTENS BETWEEN HIGH PRES OVER THE WESTERN 
U.S. AND LOW PRE OVER CENTRAL MEXICO MON NIGHT RESULTING NLY 
WINDS INCREASING TO 20-30 KT THROUGH THE GULF OF CALIFORNIA.

$$
DGS