000
AXPZ20 KNHC 181504
TWDEP 

TROPICAL WEATHER DISCUSSION     
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
1605 UTC SUN MAR 18 2007

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.

...ITCZ...
ITCZ 3N78W 5N90W 3N105W 4N140W. SCATTERED MODERATE TO ISOLATED 
STRONG CONVECTION FROM 4N-7N BETWEEN 128W-133W. SCATTERED 
MODERATE CONVECTION WITH 50 NM EITHER SIDE OF AXIS FROM 92W-105W.

...DISCUSSION...
UPPER LEVEL...
MID TO UPPER LEVEL TROUGH EXTENDS FROM 32N134W TO A CYCLONIC 
CIRCULATION CENTER NEAR 29N136W TO 24N140W. BROAD UPPER LEVEL 
ANTICYCLONIC FLOW IS N OF 10N E OF 130W INTO MEXICO...WITH A MID 
LEVEL ANTICYCLONIC CIRCULATION NEAR 17N106W. THE N PORTION OF 
THE RIDGE OVER MEXICO IS BEING FLATTENED BY A SHORT WAVE TROUGH 
MOVING THE THROUGH THE SOUTHERN ROCKIES AND THE NORTHERN MEXICAN 
STATE OF CHIHUAHUA. WIDELY SCATTERED SHOWERS ASSOCIATED WITH THE 
SHORT WAVE TROUGH ARE MOVING ACROSS NORTHERN MEXICO AND CROSSING 
THE RIO GRANDE INTO W TEXAS.

SURFACE RIDGE IS ALONG 32N132 TO 15N111W. A STATIONARY 
FRONT IS JUST NW OF THE AREA.

PRES GRADIENT STILL REMAINS TIGHT ENOUGH FOR GALE FORCE WINDS IN 
THE GULF OF TEHUANTEPEC...HOWEVER THE RIDGE OVER THE SOUTHERN 
GULF OF MEXICO IS EXPECTED TO WEAKEN AND WINDS SHOULD DECREASE 
TO BELOW GALE FORCE THIS AFTERNOON.

$$
DGS