000 AXPZ20 KNHC 071530 TWDEP TROPICAL WEATHER DISCUSSION NWS NATIONAL HURRICANE CENTER MIAMI FL 1605 UTC SAT DEC 07 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 1200 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY THROUGH 1500 UTC. ...SPECIAL FEATURE... GULF OF TEHUANTEPEC...GALE FORCE WINDS FOLLOW A COLD FRONT MOVING ACROSS THE WESTERN GULF OF MEXICO THIS MORNING. THE DENSE AIR WILL FUNNEL SOUTH THROUGH THE NARROW CHIVELA PASS IN THE ISTHMUS OF TEHUANTEPEC LATER TODAY...DELIVERING GALE FORCE WINDS TO ADJACENT PACIFIC WATERS IN THE GULF OF TEHUANTEPEC THIS EVENING. A GALE WARNING IS IN EFFECT STARTING AT 08/0000 UTC AND PERSISTING 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 THROUGH SUNDAY AS THE AIRMASS N OF THE AREA MODIFIES AND SHIFTS EASTWARD. LOOKING AHEAD...A STRONGER COLD FRONT IS EXPECTED TO MOVE ACROSS THE WESTERN GULF OF MEXICO LATE TUE... AND INTO THE GULF OF TEHUANTEPEC WED...WITH GALE FORCE WINDS EXPECTED WED NIGHT THROUGH EARLY THU. ...INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH... MONSOON TROUGH FROM 09N84W TO 07N95W. ITCZ FROM 07N95W TO 09N125W TO BEYOND 08N140W. SCATTERED MODERATE ISOLATED STRONG FROM 04N TO 07N E OF 81W AND WITHIN 90 NM S OF TROUGH BETWEEN 88W AND 90W. SCATTERED MODERATE FROM 07N TO 10N W OF 118W. ...DISCUSSION... A 1024 MB HIGH PRES LOCATED NEAR 32N132W EXTENDS A RIDGE ACROSS MOST OF THE FORECAST WATERS N OF 12N W OF 110W. THIS FEATURE WILL SHIFT SE BRINGING AN INCREASE IN THE TRADE WIND FLOW... WITH SEAS TO 11 FT...PARTICULARLY FROM 10N TO 20N W OF 120W. THE PERSISTENT TRADE WINDS ARE SUPPORTING SHORTER PERIOD NE SWELL IN THIS AREA AS WELL. A RECENT ALTIMETER PASS SHOWED SEAS TO NEAR 10 FT IN THE AREA OF THE TRADE WINDS. A FRONTAL BOUNDARY IS EXPECTED TO STALL TO THE NE OF THE AREA TONIGHT. MARINE GUIDANCE IS INDICATING LONGER PERIOD NW SWELL IN EXCESS OF 8 FT MOVING INTO THE AREA N OF 20N W OF 135W SUNDAY AND PERSISTING THROUGH NEXT WEEK. CROSS EQUATORIAL LONG PERIOD SWELLS WILL ALSO REACH THE SOUTH-CENTRAL WATERS ON SUNDAY. BOTH SWELL EVENTS ARE FORECAST TO MERGE BY LATE MON INTO TUE BETWEEN 110W AND 120W. GULF OF CALIFORNIA...HIGH PRES WILL GRADUALLY BUILD N OF THE AREA 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. THE STRONG NW WINDS WILL PUSH DOWN THE LENGTH OF THE GULF THROUGH LATE MONDAY AND TUESDAY...WITH SEAS LIKELY REACHING 8 FT. ELSEWHERE E OF 110W...GAP WINDS WILL ALSO PULSE TO 25 KT IN THE GULF OF PAPAGAYO...PRIMARILY IN OVERNIGHT AND EARLY SUN MORNING. FARTHER SOUTH...MODERATE SW FLOW INTO THE MONSOON TROUGH WILL CONTINUE TO SUPPORT SCATTERED SHOWERS AND THUNDERSTORMS GENERALLY FROM 04N TO 08N E OF 90W. $$ GR