000
AXPZ20 KNHC 310850
TWDEP 

TROPICAL WEATHER DISCUSSION    
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
1005 UTC THU MAY 31 2007

TROPICAL WEATHER DISCUSSION FOR THE EASTERN PACIFIC OCEAN FROM 
THE EQUATOR TO 32N...EAST OF 140W. 

BASED ON 0600 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY THROUGH 
0900 UTC.

...SPECIAL FEATURES...
.TROPICAL STORM BARBARA NEAR 13.2N 96.7W 1002 MB AT 0900 UTC MAY 
31 MOVING SE OR 130 DEG AT 2 KT. MAXIMUM SUSTAINED WINDS 40 KT 
GUSTS 50 KT. CONVECTION WITH BARBARA HAS BEEN FLUCTUATING AND IS 
NOW IS INCREASING WITH STRONG TSTMS FROM 12N-14N BETWEEN 
96W-100W.

TROPICAL DEPRESSION ALVIN NEAR 12.9N 115.5W 1005 MB AT 0900 UTC 
MAY 31 MOVING WSW OR 250 DEG AT 4 KT. MAXIMUM SUSTAINED WINDS 30 
KT GUSTS 40 KT. ISOLATED MODERATE CONVECTION IS WITHIN 120 NM W 
OF THE CENTER.

...ITCZ...
ITCZ AXIS ALONG 11N100W 10N110W 6N130W 5N140W. SCATTERED 
MODERATE TO STRONG N OF 11N BETWEEN 89W AND 94W AND WITHIN 120 
NM EITHER SIDE OF AXIS FROM 102W TO 110W.

...DISCUSSION...
SHARP MID/UPPER LEVEL TROUGH OVER THE NW PORTION OF THE AREA 
EXTENDS FROM 32N134W TO CYCLONIC CIRCULATION NEAR 25N137W TO 
17N140W. A 75-95 KT JET STREAM ON THE SE SIDE OF THE TROUGH FROM 
18N134W TO 32N119W. SOME HIGH LEVEL MOISTURE IS BEING ADVECTED 
NWD ALONG THE JET. DOWNSTREAM RIDGE EXTENDS FROM ANTICYCLONIC 
CIRCULATION NEAR 17N115W N ACROSS THE BAJA PENINSULA INTO 
SOUTHERN CALIFORNIA. MOSTLY DRY AIR IS N OF 20N E OF THE RIDGE
AXIS. ANOTHER UPPER LEVEL ANTICYCLONIC CIRCULATION IS OVER 
HONDURAS. DIFFLUENCE ALOFT IS ENHANCING CONVECTIVE ACTIVITY 
ACROSS CENTRAL AMERICA AND ADJACENT COASTAL WATERS.

SURFACE BROAD RIDGE AXIS FROM 32N132W TO 19N11W. AN AREA OF 
STRATOCUMULUS CLOUDS WITHIN THE RIDGE N OF 20N W OF 115W.

$$
DGS