000
AXPZ20 KNHC 170921
TWDEP 

TROPICAL WEATHER DISCUSSION 
NWS NATIONAL HURRICANE CENTER MIAMI FL
1005 UTC SUN JUN 17 2012

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 19N110W 10N115W TO 02N140W. SCATTERED MODERATE TO 
STRONG CONVECTION WITHIN 90 NM N AND 120 NM S OF AXIS FROM 
110W-120W.

...DISCUSSION...
UPPER LEVEL TROUGH EXTENDS FROM 32N119W TO CYCLONIC CIRCULATION 
NEAR 26N125W TO 19N132W. AN 80-90 KT NLY JETSTREAM NW OF TROUGH 
AXIS FROM 32N125W TO 25N130W...WITH A 75 KT SLY JET SE OF THE 
TROUGH FROM 24N122W TO NORTHERN BAJA CALIFORNIA. UPPER LEVEL 
ANTICYCLONIC CIRCULATION NEAR 18N106W WITH RIDGE N ACROSS 
MEXICO. STRONG SUBSIDENCE WITH DRY STABLE AIR AT THE MIDDLE AND 
UPPER LEVELS IS N OF 20N W OF 110W AND S OF 20N W OF 125W.

SURFACE HIGH PRES CENTER N OF THE AREA WITH RIDGE N OF 15N W OF 
130W. THE PRES GRADIENT BETWEEN RIDGE AND A 1012 MB LOW PRES 
NEAR 27N123W IS PRODUCING NLY WINDS 20 TO 25 KT N OF 24W W OF 
126W.

SURFACE LOW PRES CENTER 1005 MB NEAR 16N111W WITH SW WINDS 20-25 
KT WITHIN 360 NM SE SEMICIRCLE. THE LOW IS FORECAST TO DRIFT W.

$$
DGS