000 WTPZ31 KNHC 041137 TCPEP1 BULLETIN HURRICANE VANCE INTERMEDIATE ADVISORY NUMBER 21A NWS NATIONAL HURRICANE CENTER MIAMI FL EP212014 400 AM PST TUE NOV 04 2014 ...VANCE WEAKENING AS IT ENCOUNTERS STRONG UPPER-LEVEL WINDS... SUMMARY OF 400 AM PST...1200 UTC...INFORMATION ---------------------------------------------- LOCATION...18.7N 109.8W ABOUT 75 MI...120 KM E OF SOCORRO ISLAND ABOUT 380 MI...610 KM SW OF MAZATLAN MEXICO MAXIMUM SUSTAINED WINDS...100 MPH...160 KM/H PRESENT MOVEMENT...NNE OR 25 DEGREES AT 12 MPH...19 KM/H MINIMUM CENTRAL PRESSURE...973 MB...28.73 INCHES WATCHES AND WARNINGS -------------------- CHANGES WITH THIS ADVISORY... NONE. SUMMARY OF WATCHES AND WARNINGS IN EFFECT... A TROPICAL STORM WATCH IS IN EFFECT FOR... * MAZATLAN NORTHWARD TO TOPOLOBAMPO MEXICO A TROPICAL STORM WATCH MEANS THAT TROPICAL STORM CONDITIONS ARE POSSIBLE WITHIN THE WATCH AREA...IN THIS CASE WITHIN THE NEXT 36 HOURS. INTERESTS ELSEWHERE ALONG THE SOUTHWESTERN COAST OF MEXICO SHOULD MONITOR THE PROGRESS OF VANCE. FOR STORM INFORMATION SPECIFIC TO YOUR AREA...PLEASE MONITOR PRODUCTS ISSUED BY YOUR NATIONAL METEOROLOGICAL SERVICE. DISCUSSION AND 48-HOUR OUTLOOK ------------------------------ AT 400 AM PST...1200 UTC...THE CENTER OF HURRICANE VANCE WAS LOCATED NEAR LATITUDE 18.7 NORTH...LONGITUDE 109.8 WEST. VANCE IS MOVING TOWARD THE NORTH-NORTHEAST NEAR 12 MPH...19 KM/H...AND THIS GENERAL MOTION IS EXPECTED TO CONTINUE FOR THE NEXT COUPLE OF DAYS. ON THE FORECAST TRACK...THE CENTER OF VANCE IS EXPECTED TO BE NEAR THE WESTERN COAST OF MEXICO IN THE TROPICAL STORM WATCH AREA ON WEDNESDAY. MAXIMUM SUSTAINED WINDS HAVE DECREASED TO NEAR 100 MPH...160 KM/H... WITH HIGHER GUSTS. STEADY TO RAPID WEAKENING IS FORECAST DURING THE NEXT DAY OR SO...AND VANCE COULD WEAKEN TO A TROPICAL DEPRESSION BY THE TIME IT REACHES THE COAST OF MEXICO. HURRICANE FORCE WINDS EXTEND OUTWARD UP TO 25 MILES...35 KM...FROM THE CENTER...AND TROPICAL STORM FORCE WINDS EXTEND OUTWARD UP TO 125 MILES...205 KM. THE ESTIMATED MINIMUM CENTRAL PRESSURE IS 973 MB...28.73 INCHES. HAZARDS AFFECTING LAND ---------------------- RAINFALL...VANCE AND MOISTURE SPREADING NORTHWARD AHEAD OF THE SYSTEM ARE EXPECTED TO PRODUCE RAINFALL TOTALS OF 4 TO 8 INCHES WITH ISOLATED AMOUNTS NEAR 12 INCHES THROUGH WEDNESDAY OVER THE STATES OF SINALOA...NAYARIT....AND DURANGO IN WESTERN MEXICO. THESE RAINS ARE LIKELY TO PRODUCE LIFE-THREATENING FLASH FLOODS AND MUD SLIDES... ESPECIALLY IN AREAS OF MOUNTAINOUS TERRAIN. SURF...SWELLS GENERATED BY VANCE WILL BE AFFECTING PORTIONS OF THE COAST OF SOUTHWESTERN MEXICO AND BAJA CALIFORNIA SUR TODAY AND TONIGHT. THESE SWELLS ARE LIKELY TO CAUSE LIFE-THREATENING SURF AND RIP CURRENT CONDITIONS. PLEASE CONSULT PRODUCTS FROM YOUR LOCAL WEATHER OFFICE. NEXT ADVISORY ------------- NEXT COMPLETE ADVISORY...700 AM PST. $$ FORECASTER BEVEN