000
AXPZ20 KNHC 090915
TWDEP 

FROM FROTROPICAL WEATHER DISCUSSION                                    
NWS NATIONAL HURRICANE CENTER MIAMI FL                          
1005 UTC TUE APR 09 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...              
MONSOON TROUGH 10N85W TO 05N94W. ITCZ 5N94W 10N110W 04N125W TO
3N140W. SCATTERED MODERATE ISOLATED STRONG CONVECTION WITHIN 
200 NM N OF AXIS FROM 106W-110W AND WITHIN 120 NM OF AXIS FROM
114W-118W.

...DISCUSSION...                                             
AN UPPER LEVEL TROUGH IN THE NW PORTION OF THE DISCUSSION AREA
IS N OF 20N W OF 125W. A BROAD UPPER LEVEL TROUGH E OF THE 
N OF 25N E OF 125W. OTHERWISE MOSTLY ZONAL UPPER LEVEL FLOW
PATTERN FROM 19N TO 25N E OF 125W. A 95-105 KT JETSTREAM
IS FROM 22N120W INTO CENTRAL MEXICO. MODERATE TO STRONG
SUBSIDENCE WITH DRY AIR AT THE MIDDLE AND UPPER LEVELS IS N
OF 20N. IN THE DEEP TROPICS AN UPPER LEVEL TROUGH EXTENDS FROM
18N138W TO 6N126W. MIDDLE AND HIGH CLOUDS ARE WITHIN 600 NM
NE OF THE TROUGH AXIS. AN UPPER LEVEL ANTICYCLONIC CIRCULATION
IS CENTERED NEAR 11N98W. UPPER LEVEL DIFFLUENT FLOW IS
ENHANCING CONVECTION FROM 9N-12N BETWEEN 106W-110W.

SURFACE RIDGE IS ACROSS THE AREA N OF 15N W OF 110W. THE PRES
GRADIENT ALONG THE SOUTHERN PERIPHERY OF THE RIDGE IS SUPPORTING
ELY WINDS 20-25 KT FROM 10N-20N W OF 130W. ALSO THE GRADIENT
BETWEEN THE RIDGE AND LOW PRES OF THE SW U.S. IS PRODUCING
20-25 KT ALONG THE COAST OF BAJA CALIFORNIA. THE LOW IS FORECAST
TO MOVE NE AND THE GRADIENT RELAXES AND WINDS DECREASE TO 20
KT OR LESS...HOWEVER LARGE NW SWELLS WILL LINGER ACROSS MUCH OF
THE ARE W OF 110W.

$$
DGS