ZCZC MIATCPEP4 ALL TTAA00 KNHC DDHHMM BULLETIN Hurricane Hilary Advisory Number 7 NWS National Hurricane Center Miami FL EP092023 900 PM MDT Thu Aug 17 2023 ...HILARY CONTINUES TO RAPIDLY INTENSIFY... ...HURRICANE WATCHES ISSUED FOR PORTIONS OF THE WEST COAST OF BAJA CALIFORNIA SUR... SUMMARY OF 900 PM MDT...0300 UTC...INFORMATION ---------------------------------------------- LOCATION...16.7N 110.0W ABOUT 430 MI...690 KM S OF CABO SAN LUCAS MEXICO MAXIMUM SUSTAINED WINDS...125 MPH...205 KM/H PRESENT MOVEMENT...WNW OR 300 DEGREES AT 14 MPH...22 KM/H MINIMUM CENTRAL PRESSURE...952 MB...28.12 INCHES WATCHES AND WARNINGS -------------------- CHANGES WITH THIS ADVISORY: The government of Mexico has issued a Hurricane Watch on the west coast of the Baja California peninsula north of Punta Abreojos to Punta Eugenia, and has extended the Tropical Storm Watch northward on the east of the Baja California peninsula to Bahia San Juan Bautista. SUMMARY OF WATCHES AND WARNINGS IN EFFECT: A Hurricane Watch is in effect for... * Baja California Sur North of Punta Abreojos to Punta Eugenia A Tropical Storm Warning is in effect for... * Baja California Sur from Cabo San Lazaro southward * Baja California Sur from Los Barriles southward A Tropical Storm Watch is in effect for... * Baja California Sur North of Cabo San Lazaro to Punta Abreojos * Baja California Sur North of Los Barriles to Bahia San Juan Bautista A Hurricane Watch means that hurricane conditions are possible within the watch area. A watch is typically issued 48 hours before the anticipated first occurrence of tropical-storm-force winds, conditions that make outside preparations difficult or dangerous. 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 on the Baja California peninsula, along the coast of northwestern mainland Mexico, and the southwestern United States coastline should closely monitor the progress of Hilary. Additional watches or warnings will likely be required for portions of these areas on Friday. 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 Hilary was located near latitude 16.7 North, longitude 110.0 West. Hilary is moving toward the west-northwest near 14 mph (22 km/h). A turn toward the northwest is expected to begin tomorrow morning, followed by a turn toward the north-northwest and north on Saturday. On the forecast track, the center of Hilary will approach the Baja California peninsula over the weekend. Maximum sustained winds have increased to near 125 mph (205 km/h) with higher gusts. Hilary is a category 3 hurricane on the Saffir-Simpson Hurricane Wind Scale. Rapid intensification is expected to continue through tomorrow morning, and Hilary is likely to become a category 4 hurricane. Hilary should then begin to weaken on Saturday. Hurricane-force winds extend outward up to 60 miles (95 km) from the center and tropical-storm-force winds extend outward up to 290 miles (465 km). The estimated minimum central pressure is 952 mb (28.12 inches). HAZARDS AFFECTING LAND ---------------------- RAINFALL: Hilary is expected to produce rainfall amounts of 3 to 6 inches, with isolated maximum amounts up to 10 inches, across portions of the Baja California Peninsula through Sunday night. Flash flooding, locally significant, will be possible. Heavy rainfall in association with Hilary is expected to impact the Southwestern United States from Friday through early next week, peaking on Sunday and Monday. Rainfall amounts of 3 to 5 inches, with isolated amounts of 10 inches, will be possible across portions of southern California and southern Nevada. Elsewhere across western Arizona, southwest Utah, central Nevada, and central California, rainfall totals of 1 to 3 inches are expected. WIND: Hurricane conditions are possible within the hurricane watch area by Saturday night or Sunday morning, with tropical storm conditions possible by Saturday. Tropical storm conditions are expected within the warning area by late Friday, and are possible within the watch area by early Saturday. STORM SURGE: A storm surge could produce coastal flooding along the western Baja California peninsula of Mexico near where the center passes the coast in areas of onshore winds, or east of the center if Hilary makes landfall. The surge will be accompanied by large and destructive waves. SURF: Large swells generated by Hilary will affect portions of the coast of southwestern Mexico and the Baja California peninsula over the next few days. 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 Papin NNNN