000
AXPZ20 KNHC 281555
TWDEP 

TROPICAL WEATHER DISCUSSION
NWS NATIONAL HURRICANE CENTER MIAMI FL 
1605 UTC SAT NOV 28 2015

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.               

...SPECIAL FEATURES...

POST-TROPICAL CYCLONE SANDRA NEAR 22.0N 108.9W MOVING N OR 010
DEG AT 6 KT. MAXIMUM SUSTAINED WINDS 30 KT GUSTS 40 KT.
ESTIMATED MINIMUM CENTRAL PRESSURE IS 1004 MB. SANDRA HAS LOST
ALL ITS CONVECTION AND IS RAPIDLY WEAKENING AS A RESULT. THE NHC
HAS ISSUED ITS FINAL ADVISORY ON THIS TROPICAL CYCLONE. POOR
MARINE CONDITIONS CAN BE EXPECTED IN THE SOUTHERN GULF OF
CALIFORNIA WITHIN 90 NM OF THE CYCLONE CENTER DURING THE NEXT 12-
24 HOURS. SEE FINAL NHC FORECAST ADVISORY UNDER AWIPS/WMO
HEADERS MIATCMEP2/WTPZ22 NHC FOR MORE DETAILS.
 
GULF OF TEHUANTEPEC GALE WARNING...HIGH PRESSURE IN THE CENTRAL
GULF OF MEXICO IS SUPPORTING 20-30 KT WINDS THIS MORNING IN THE
GULF OF TEHUANTEPEC BASED ON SCATTEROMETER DATA LAST NIGHT. HIGH
PRESSURE BUILDING SOUTHWARD INTO CENTRAL MEXICO IS EXPECTED TO
TIGHTEN THE PRES GRADIENT ACROSS TEHUANTEPEC AND ALLOW GALES TO
DEVELOP TONIGHT AROUND 0600 UTC...AND CONTINUE FOR 24-30 HOURS
THROUGH MON MORNING AT 1200 UTC.

...INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH...          

MONSOON TROUGH EXTENDS FROM 06N78W TO 04N81W TO 05N95W. ITCZ
EXTENDS FROM 09N119W TO 04N140W. SCATTERED MODERATE ISOLATED
STRONG CONVECTION FROM 06N TO 09N BETWEEN 108W TO 120W.
SCATTERED MODERATE CONVECTION WITHIN 75 NM EITHER SIDE OF AXIS
BETWEEN 125W AND 131W.

...DISCUSSION...                                        
WEAKENING COLD FRONT STRETCHES FROM LOW PRES N OF THE AREA NEAR
36N129W TO 32N129W TO 30N134W TO 30N143W. WEAK HIGH PRES BEHIND
FRONT CENTERED NEAR 33N140W...WITH A STRONGER COLD FRONT NW OF
THE HIGH. BROAD RIDGE PREVAILS OVER NORTHERN WATERS N OF 18N W
OF 115W. PRES GRADIENT BETWEEN THE RIDGE AND ITCZ IS SUPPORTING
20-25 KT WINDS FROM 15N-21N W OF 126W. LARGE AREA OF 8-12 FT
SEAS FROM SWELL GENERATED BY SANDRA...NW SWELL SWEEPING INTO THE
AREA FROM THE CENTRAL PACIFIC AND FRESH NE TRADE SWELL EXISTS W
OF 115W-120W. THE AREA OF FRESH TO STRONG TRADES IS EXPECTED TO
SHIFT WEST-SOUTHWESTWARD AS RIDGING BUILDS SOUTHEASTWARD ACROSS
THE NORTHERN FORECAST WATERS THROUGH SUN. A NEW COLD FRONT WILL
ENTER THE NW FORECAST WATERS MONDAY MORNING WITH NW SWELL W OF
THE BOUNDARY REACHING UP TO 13 FT.

GAP WINDS... 

NORTHEAST WINDS WILL BLOW ACROSS AND DOWNSTREAM OF THE GULF OF
PAPAGAYO THE NEXT FEW DAYS WITH PULSES TO 25 KT. OTHER GAP WIND
PRONE AREAS SUCH AS THE GULF OF FONSECA MAY ALSO REACH NEAR 20
KT EACH NIGHT AND EARLY MORNING THROUGH MON.
 
$$
MUNDELL