000 WTPZ34 KNHC 230239 TCPEP4 BULLETIN HURRICANE HILARY ADVISORY NUMBER 8 NWS NATIONAL HURRICANE CENTER MIAMI FL EP092011 800 PM PDT THU SEP 22 2011 ...HILARY SMALL BUT POWERFUL.... SUMMARY OF 800 PM PDT...0300 UTC...INFORMATION ---------------------------------------------- LOCATION...16.0N 100.8W ABOUT 85 MI...140 KM SW OF ACAPULCO MEXICO MAXIMUM SUSTAINED WINDS...135 MPH...215 KM/H PRESENT MOVEMENT...WNW OR 295 DEGREES AT 9 MPH...15 KM/H MINIMUM CENTRAL PRESSURE...948 MB...27.99 INCHES WATCHES AND WARNINGS -------------------- CHANGES WITH THIS ADVISORY... NONE. SUMMARY OF WATCHES AND WARNINGS IN EFFECT... A TROPICAL STORM WARNING IS IN EFFECT FOR... * LAGUNAS DE CHACAHUA MEXICO WESTWARD TO PUNTA SAN TELMO A TROPICAL STORM WATCH IS IN EFFECT FOR... * WEST OF PUNTA SAN TELMO TO MANZANILLO FOR STORM INFORMATION SPECIFIC TO YOUR AREA...PLEASE MONITOR PRODUCTS ISSUED BY YOUR NATIONAL METEOROLOGICAL SERVICE. DISCUSSION AND 48-HOUR OUTLOOK ------------------------------ AT 800 PM PDT...0300 UTC...THE EYE OF HURRICANE HILARY WAS LOCATED NEAR LATITUDE 16.0 NORTH...LONGITUDE 100.8 WEST. HILARY IS MOVING TOWARD THE WEST-NORTHWEST NEAR 9 MPH...15 KM/H. THIS GENERAL MOTION IS EXPECTED TO CONTINUE DURING THE NEXT 24 TO 48 HOURS. ON THE FORECAST TRACK...THE CORE OF HILARY WILL CONTINUE TO MOVE PARALLEL TO THE SOUTHWEST COAST OF MEXICO...BUT ANY DEVIATION TO THE NORTH OF THE TRACK COULD BRING STRONGER WINDS TO THE COAST. SATELLITE INTENSITY ESTIMATES INDICATE THAT HILARY HAS RAPIDLY INTENSIFIED...AND THE MAXIMUM SUSTAINED WINDS HAVE INCREASED TO NEAR 135 MPH...215 KM/H...WITH HIGHER GUSTS. HILARY IS A CATEGORY FOUR HURRICANE ON THE SAFFIR-SIMPSON HURRICANE WIND SCALE. SOME ADDITIONAL STRENGTHENING IS POSSIBLE ON FRIDAY...BUT MOST LIKELY...THERE WILL BE SOME FLUCTUATIONS IN INTENSITY DURING THE NEXT DAY OR SO. HILARY IS A SMALL TROPICAL CYCLONE. HURRICANE FORCE WINDS EXTEND OUTWARD UP TO 25 MILES...35 KM...FROM THE CENTER...AND TROPICAL STORM FORCE WINDS EXTEND OUTWARD UP TO 80 MILES...130 KM. ESTIMATED MINIMUM CENTRAL PRESSURE IS 948 MB...27.99 INCHES. HAZARDS AFFECTING LAND ---------------------- WIND...TROPICAL STORM FORCE WINDS ARE AFFECTING PORTIONS OF THE COAST WITHIN THE WARNING AREA. THESE WINDS ARE EXPECTED TO SPREAD WESTWARD ALONG THE COAST DURING THE NEXT 24 TO 36 HOURS. RAINFALL...HILARY IS EXPECTED TO PRODUCE RAINFALL AMOUNTS OF 3 TO 5 INCHES ACROSS SOUTHERN GUERRERO AND SOUTHERN MICHOACAN IN SOUTHERN MEXICO WITH ISOLATED AMOUNTS OF 10 INCHES POSSIBLE. SURF...SWELLS GENERATED BY HILARY ARE AFFECTING PORTIONS OF THE COAST OF SOUTHWESTERN MEXICO. THESE SWELLS ARE LIKELY TO CAUSE LIFE-THREATENING SURF AND RIP CURRENT CONDITIONS. NEXT ADVISORY ------------- NEXT INTERMEDIATE ADVISORY...1100 PM PDT. NEXT COMPLETE ADVISORY...200 AM PDT. $$ FORECASTER AVILA