000
AXPZ20 KNHC 080301
TWDEP 

TROPICAL WEATHER DISCUSSION 
NWS NATIONAL HURRICANE CENTER MIAMI FL 
0405 UTC SUN DEC 08 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 0000 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY THROUGH 
0300 UTC.

...SPECIAL FEATURE... 

GULF OF TEHUANTEPEC...GALE FORCE WINDS BEHIND A STALLED FRONT 
OVER THE GULF OF MEXICO ARE FUNNELING THROUGH THE CHIVELA PASS 
INTO THE GULF OF TEHUANTEPEC. A GALE WARNING IS IN EFFECT FOR 
THE GULF OF TEHUANTEPEC AND WILL PERSIST THROUGH EARLY SUNDAY 
MORNING WHEN OVERNIGHT DRAINAGE EFFECTS WILL CONTRIBUTE TO THE 
WIND SPEEDS NEAR THE COAST. SEAS WILL BUILD TO 11 FT OVERNIGHT. 
WINDS AND SEAS WILL DIMINISH RAPIDLY THROUGH SUNDAY AS THE 
AIRMASS N OF THE AREA MODIFIES. WINDS WILL DIMINISH BELOW GALE 
FORCE BY SUN AFTERNOON...AND BELOW 25 KT WITH SEAS LESS THAN 8 
FT BY SUN EVENING. 

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

THE MONSOON TROUGH EXTENDS FROM 09N85W TO 05N100W WHERE LOW 
LEVEL WINDS SUGGEST A TRANSITION TO ITCZ WHICH EXTENDS TO 
06N118W TO 09N125W TO BEYOND 09N140W. SCATTERED MODERATE 
ISOLATED STRONG CONVECTION WAS NOTED N OF 06N BETWEEN 80W AND 
83W. SCATTERED MODERATE CONVECTION WAS NOTED WITHIN 120 NM OF 
TROUGH BETWEEN 91W AND 98W. SCATTERED MODERATE CONVECTION 
WAS NOTED WITHIN 30 NM OF ITCZ BETWEEN 122W AND 127W. 

...DISCUSSION... 

HIGH PRESSURE OF 1028 MB IS CENTERED NEAR 30N132W WITH RIDGE 
EXTENDING SE TO NEAR 17N107W. THE PRESSURE GRADIENT BETWEEN THE 
AREA OF HIGH PRESSURE AND LOWER PRESSURE IN THE VICINITY OF THE 
ITCZ IS SUPPORTING A LARGE AREA OF FRESH TO STRONG TRADES FROM 
11N TO 20N W OF 120W WITH SEAS TO 11 FT. THE STRONG HIGH 
PRESSURE WILL REMAIN IN THIS AREA OVER THE NEXT COUPLE OF DAYS. 
THIS WILL MAINTAIN THE TIGHT PRESSURE GRADIENT AND THE LARGE 
AREA OF FRESH TO STRONG TRADES N OF THE ITCZ THROUGH MON. 

GULF OF CALIFORNIA...HIGH PRES WILL BUILD OVER THE GREAT BASIN 
OF THE WESTERN UNITED STATES. THIS WILL SET UP A STRONG GRADIENT 
FOLLOWED BY 20 TO 25 KT WINDS FUNNELING INTO THE NORTHERN GULF 
OF CALIFORNIA BY MONDAY AFTERNOON AND REACHING NEAR GALE BY MON 
EVENING. THE NW WINDS WILL PUSH DOWN THE LENGTH OF THE GULF 
THROUGH LATE MONDAY AND TUESDAY...WITH SEAS REACHING 8-9 FT.

GAP WINDS... 

GULF OF PAPAGAYO...WINDS WILL PULSE TO 25 KT...PRIMARILY IN 
OVERNIGHT AND EARLY MORNING HOURS. 

LOOKING AHEAD FOR THE GULF OF TEHUANTEPEC...A STRONGER COLD 
FRONT IS EXPECTED TO MOVE ACROSS THE GULF OF MEXICO MID WEEK. 
WINDS OVER THE GULF OF TEHUANTEPEC ARE EXPECTED TO INCREASE TO 
GALE FORCE WED.

$$
AL