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ZCZC MIATCPAT4 ALL TTAA00 KNHC DDHHMM BULLETIN Hurricane Harvey Advisory Number 25 NWS National Hurricane Center Miami FL AL092017 1000 AM CDT Sat Aug 26 2017 ...HARVEY DRENCHING TEXAS... ...TORRENTIAL RAINS WILL CONTINUE FOR A FEW MORE DAYS... SUMMARY OF 1000 AM CDT...1500 UTC...INFORMATION ----------------------------------------------- LOCATION...28.9N 97.3W ABOUT 25 MI...35 KM W OF VICTORIA TEXAS ABOUT 80 MI...130 KM ESE OF SAN ANTONIO TEXAS MAXIMUM SUSTAINED WINDS...75 MPH...120 KM/H PRESENT MOVEMENT...N OR 350 DEGREES AT 2 MPH...4 KM/H MINIMUM CENTRAL PRESSURE...984 MB...29.06 INCHES WATCHES AND WARNINGS -------------------- CHANGES WITH THIS ADVISORY: The Storm Surge Warning for the Texas coast south of Port Aransas has been discontinued. The Hurricane Warning for the Texas coast has been replaced with a Tropical Storm Warning. SUMMARY OF WATCHES AND WARNINGS IN EFFECT: A Storm Surge Warning is in effect for... * Port Aransas to High Island Texas A Tropical Storm Warning is in effect for... * Baffin Bay to High Island Texas Hurricane warnings continue for inland areas near the center of Harvey. Please see products from your local National Weather Service office. A Storm Surge Warning means there is a danger of life-threatening inundation from rising water moving inland from the coastline in the indicated locations. For a depiction of areas at risk, please see the National Weather Service Storm Surge Watch/Warning Graphic, available at hurricanes.gov. This is a life-threatening situation. A Tropical Storm Warning means that tropical storm conditions are expected somewhere within the warning. For storm information specific to your area, including possible inland watches and warnings, please monitor products issued by your local National Weather Service forecast office. DISCUSSION AND 48-HOUR OUTLOOK ------------------------------ At 1000 AM CDT (1500 UTC), the center of Hurricane Harvey was located near latitude 28.9 North, longitude 97.3 West. Harvey is moving slowly toward the north near 2 mph (4 km/h), and little motion is anticipated during the next several days. Maximum sustained winds have decreased to near 75 mph (120 km/h) with higher gusts. These winds are confined to a small area near the center. Weakening is forecast during the next 48 hours, and Harvey is expected to become a tropical storm this afternoon. Hurricane-force winds extend outward up to 25 miles (35 km) from the center and tropical-storm-force winds extend outward up to 140 miles (220 km). The estimated minimum central pressure is 984 mb (29.06 inches). HAZARDS AFFECTING LAND ---------------------- RAINFALL: Harvey is expected to produce total rain accumulations of 15 to 30 inches and isolated maximum amounts of 40 inches over the middle and upper Texas coast through Thursday. During the same time period Harvey is expected to produce total rain accumulations of 5 to 15 inches in far south Texas, the Texas Hill Country and southwest and central Louisiana. Rainfall of this magnitude will cause catastrophic and life-threatening flooding. A list of rainfall observations compiled by the NOAA Weather Prediction Center can be found at: www.wpc.ncep.noaa.gov/discussions/nfdscc1.html STORM SURGE: The combination of a dangerous storm surge and the tide will cause normally dry areas near the coast to be flooded by rising waters moving inland from the shoreline. The water is expected to reach the following heights above ground if the peak surge occurs at the time of high tide... Port Aransas to Sargent...4 to 7 ft Sargent to High Island including Galveston Bay...2 to 4 ft High Island to Morgan City...1 to 3 ft The deepest water will occur along the immediate coast near the area of onshore winds, where the surge will be accompanied by large and destructive waves. Surge-related flooding depends on the relative timing of the surge and the tidal cycle, and can vary greatly over short distances. For information specific to your area, please see products issued by your local National Weather Service forecast office. WIND: Hurricane conditions are occuring inland near the core of Harvey. Tropical storm conditions are occurring in portions of the tropical storm warning area, and are likely to persist along portions of the coast through at least Sunday. SURF: Swells generated by Harvey are affecting the Texas, Louisiana, and northeast Mexico coasts. These swells are likely to cause life-threatening surf and rip current conditions. Please consult products from your local weather office. TORNADOES: Tornadoes are possible today and tonight near the middle and upper Texas coast into far southwest Louisiana. NEXT ADVISORY ------------- Next intermediate advisory at 100 PM CDT. Next complete advisory at 400 PM CDT. $$ Forecaster Avila/Lapenta NNNN