ZCZC MIATCPEP2 ALL TTAA00 KNHC DDHHMM BULLETIN Hurricane Norma Advisory Number 14 NWS National Hurricane Center Miami FL EP172023 900 PM MDT Fri Oct 20 2023 ...HURRICANE CONDITIONS, FLOODING RAINFALL, AND A DANGEROUS STORM SURGE EXPECTED IN SOUTHERN BAJA CALIFORNIA SUR... SUMMARY OF 900 PM MDT...0300 UTC...INFORMATION ---------------------------------------------- LOCATION...20.8N 109.9W ABOUT 145 MI...235 KM S OF CABO SAN LUCAS MEXICO ABOUT 280 MI...450 KM SW OF MAZATLAN MEXICO MAXIMUM SUSTAINED WINDS...120 MPH...195 KM/H PRESENT MOVEMENT...NNW OR 340 DEGREES AT 9 MPH...15 KM/H MINIMUM CENTRAL PRESSURE...955 MB...28.20 INCHES WATCHES AND WARNINGS -------------------- CHANGES WITH THIS ADVISORY: The government of Mexico has issued a Tropical Storm Watch for the west coast of mainland Mexico from Bahia Tempehuaya to Mazatlan. SUMMARY OF WATCHES AND WARNINGS IN EFFECT: A Hurricane Warning is in effect for... * Baja California Sur from Todos Santos to Los Barriles A Tropical Storm Warning is in effect for... * North of Los Barriles to San Evaristo * North of Todos Santos to Santa Fe A Tropical Storm Watch is in effect for... * Las Islas Marias * Topolobampo to Mazatlan A Hurricane Warning means that hurricane conditions are expected somewhere within the warning area, in this case within the next 24 to 36 hours. Preparations to protect life and property should be rushed to completion. A Tropical Storm Warning means that tropical storm conditions are expected somewhere within the warning area within 36 hours. A Tropical Storm Watch means that tropical storm conditions are possible within the watch area, generally within 48 hours. Interests elsewhere in Baja California Sur and along the west coast of mainland Mexico should monitor the progress of Norma. Additional watches or warnings could be required later today and tonight. For storm information specific to your area, please monitor products issued by your national meteorological service. DISCUSSION AND OUTLOOK ---------------------- At 900 PM MDT (0300 UTC), the center of Hurricane Norma was located near latitude 20.8 North, longitude 109.9 West. Norma is moving toward the north-northwest near 9 mph (15 km/h). A turn toward the north is expected on Saturday, followed by a slower northeastward motion Saturday night through Monday. On the forecast track, Norma is expected to move over the southern portion of Baja California Sur within the hurricane warning area on Saturday. Norma is forecast to move toward the west coast of Mexico on Sunday and Sunday night and move inland within the tropical storm watch area on Monday. Maximum sustained winds are near 120 mph (195 km/h) with higher gusts. Norma is a category 3 hurricane on the Saffir-Simpson Hurricane Wind Scale. Some gradual weakening is expected during the next day or so, but Norma is expected to be a hurricane when it moves near or over the southern portion of Baja California Sur. Weakening is forecast to continue through early next week. Hurricane-force winds extend outward up to 35 miles (55 km) from the center and tropical-storm-force winds extend outward up to 160 miles (260 km). The estimated minimum central pressure is 955 mb (28.20 inches). HAZARDS AFFECTING LAND ---------------------- Key messages for Norma can be found in the Tropical Cyclone Discussion under AWIPS header MIATCDEP2 and WMO header WTPZ42 KNHC and on the web at hurricanes.gov/text/MIATCDEP2.shtml WIND: Hurricane conditions are expected within the hurricane warning area in Baja California Sur on Saturday, with tropical storm conditions imminent. Tropical storm conditions are expected in the tropical storm warning areas in Baja California Sur on early Saturday. Tropical storm conditions are possible in Las Islas Marias through tonight, and in the watch area along the west coast of Mexico by Sunday. RAINFALL: Norma is likely to produce rainfall totals of 5 to 10 inches with local maxima of 15 inches across the far southern portion of Baja California Sur through Sunday and across portions of Sinaloa through Monday. These rains will likely produce flash and urban flooding, along with possible mudslides in areas of higher terrain. STORM SURGE: A dangerous storm surge is likely to produce coastal flooding in areas of onshore winds within the hurricane warning area. Near the coast, the surge will be accompanied by large and destructive waves. SURF: Swells generated by Norma are affecting portions of the coast of southwestern and west-central Mexico and Baja California Sur. These swells will spread northward along the coast of western Mexico and the Baja California peninsula this weekend. These swells are likely to cause life-threatening surf and rip current conditions. Please consult products from your local weather office. NEXT ADVISORY ------------- Next intermediate advisory at 1200 AM MDT. Next complete advisory at 300 AM MDT. $$ Forecaster Kelly NNNN