000
AXPZ20 KNHC 010929
TWDEP 

TROPICAL WEATHER DISCUSSION  
NWS NATIONAL HURRICANE CENTER MIAMI FL
1005 UTC FRI FEB 01 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 9N84W 03N90W TO 05N101W. ITCZ 5N101W 7N120W 
TO 2N140W. SCATTERED MODERATE ISOLATED STRONG CONVECTION FROM 
9N-15N BETWEEN 114W-117W.

...DISCUSSION...
SHARP UPPER LEVEL TROUGH ACROSS THE FAR WESTERN PORTION OF THE 
DISCUSSION AREA WITH AXIS FROM 32N132W TO 7N135W. A 115-120
NLY JETSTREAM ON THE BACK SIDE OF THE TROUGH ALONG 139W. 
MODERATE TO STRONG SUBSIDENCE IS W OF THE TROUGH AXIS WITH 
ABUNDANT TROPICAL MOISTURE S OF 25N E OF THE TROUGH TO 115W.
AN UPPER LEVEL RIDGE EXTENDS FROM AN ANTICYCLONIC CIRCULATION 
CENTERED NEAR 3N101W NORTHWARD INTO CENTRAL MEXICO. STRONG 
SUBSIDENCE WITH DRY AND STABLE AIR AT THE MIDDLE AND UPPER 
LEVELS IS S OF 20N E OF 105W.

TIGHT PRES GRADIENT CONTINUES ACROSS SOUTHERN MEXICO WITH GALE 
FORCE WINDS THROUGH THE GULF OF TEHUANTEPEC. THE GRADIENT IS 
FORECAST TO RELAX SUN AFTERNOON AND WINDS WILL DECREASE TO BELOW 
GALE FORCE.

ELY WINDS 20-25 KT CONTINUE TO BLOW THROUGH THE GULF OF 
PAPAGAYO AND ARE EXPECTED TO CONTINUE THROUGH SUN. OTHERWISE 
LARGE NW SWELL TO 11 FT ACROSS THE AREA W OF 120W.

COLD FRONT IS EXPECTED NO MOVE INTO THE FAR NW PORTION OF THE 
AREA EXTENDING FROM 32N138W TO 26N140W FRI NIGHT. THE FRONT WILL 
DISSIPATE SAT NIGHT WITH A TROUGH EXTENDING FROM A LOW PRES 
CENTERED 21N134W TO 20N138W. WINDS WILL INCREASE TO 20-25 KT 
WITHIN 240 NM N SEMICIRCLE OF THE LOW.

$$
DGS