000
AXPZ20 KNHC 191520
TWDEP 

TROPICAL WEATHER DISCUSSION
NWS NATIONAL HURRICANE CENTER MIAMI FL
1605 UTC FRI APR 19 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 1200 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY THROUGH 
1500 UTC.

...INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH...
MONSOON TROUGH 7N77W 5N100W TO 3N127W. ITCZ 3N100W TO 1N140W.
NUMEROUS MODERATE TO STRONG WITHIN 240 NM S OF AXIS FROM 86W
TO 100W AND FROM 3N-9N BETWEEN 112W-120W.

...DISCUSSION... 
THE UPPER  LEVEL CYCLONIC CIRCULATION THAT WAS LOCATED OVER
THE FAR NW PORTION OF THE DISCUSSION AREA THE PAST SEVERAL
DAYS HAS MOVED JUST W OF THE AREA. MODERATE TO STRONG
SUBSIDENCE WITH DRY AND STABLE AIR AT THE MIDDLE AND UPPER
LEVELS N OF 25N E OF 120W. AN UPPER LEVEL RIDGE EXTENDS FROM
AN ANTICYCLONIC CIRCULATION NEAR 16N107W TO 32N130W WITH
ANOTHER RIDGE EXTENDING WESTWARD FROM THE ANTICYCLONIC
CIRCULATION INTO SOUTHERN MEXICO. ANTICYCLONIC FLOW COVERS
OF THE MUCH OF AREA. A 95-105 KT JETSTREAM BETWEEN THE
ANTICYCLONE AND AN UPPER LEVEL TROUGH OVER THE SOUTHERN PLAINS
EXTENDS FROM 28N120W NORTHERN MEXICO WHERE WINDS INCREASE TO
130 KT.

LATE SEASON COLD FRONT IS FORECAST TO MOVING THROUGH THE GULF
OF MEXICO WITH STRONG HIGH PRES BUILDING SOUTH BEHIND THE
FRONT WILL TIGHTEN THE GRADIENT OVER SOUTHERN MEXICO RESULTING
GALE FORCE WINDS THROUGH THE GULF OF TEHUANTEPEC TONIGHT
AND SAT THEN DECREASE TO BELOW GALE FORCE SUN.

$$
DGS