ZCZC HFOTCPCP1 ALL TTAA00 PHFO DDHHMM BULLETIN Hurricane Walaka Advisory Number 12 NWS Central Pacific Hurricane Center Honolulu HI CP012018 500 AM HST Tue Oct 02 2018 ...WALAKA WEAKENS SLIGHTLY BUT REMAINS A DANGEROUS CATEGORY 4 HURRICANE HEADING TOWARD JOHNSTON ISLAND... SUMMARY OF 500 AM HST...1500 UTC...INFORMATION ---------------------------------------------- LOCATION...14.7N 170.0W ABOUT 140 MI...230 KM SSW OF JOHNSTON ISLAND ABOUT 915 MI...1475 KM WSW OF HONOLULU HAWAII MAXIMUM SUSTAINED WINDS...155 MPH...250 KM/H PRESENT MOVEMENT...N OR 350 DEGREES AT 10 MPH...17 KM/H MINIMUM CENTRAL PRESSURE...927 MB...27.38 INCHES WATCHES AND WARNINGS -------------------- CHANGES WITH THIS ADVISORY: None. SUMMARY OF WATCHES AND WARNINGS IN EFFECT: A Hurricane Warning is in effect for... * Johnston Atoll A Hurricane Watch is in effect for... * Papahanaumokuakea Marine National Monument from Nihoa to French Frigate Shoals to Maro Reef A Hurricane Warning means that hurricane conditions are expected in the warning area within 36 hours. A Hurricane Watch means that hurricane conditions are possible within the watch area within 48 hours. DISCUSSION AND OUTLOOK ---------------------- At 500 AM HST (1500 UTC), the center of Hurricane Walaka was located near latitude 14.7 North, longitude 170.0 West. Walaka is moving toward the north near 10 mph (17 km/h). This general motion is expected to continue through Wednesday night with a steady increase in forward speed. On the forecast track, the center of Walaka is expected to pass just to the west of Johnston later today. Maximum sustained winds are near 155 mph (250 km/h) with higher gusts. Walaka is a category 4 hurricane on the Saffir-Simpson Hurricane Wind Scale. Little change in intensity is expected through tonight, with rapid weakening expected Wednesday and Wednesday night. Hurricane-force winds extend outward up to 40 miles (65 km) from the center and tropical-storm-force winds extend outward up to 185 miles (295 km). The estimated minimum central pressure is 927 mb (27.38 inches). HAZARDS AFFECTING LAND ---------------------- WIND: Tropical storm force winds are already occurring across Johnston Island, with hurricane conditions expected to begin this afternoon and last through this evening. Tropical storm force winds are possible across the Papahanaumokuakea Marine National Monument from Nihoa to French Frigate Shoals to Maro Reef beginning late Wednesday, with hurricane conditions possible Wednesday night. SURF: Large surf associated with Walaka will continue to affect the Johnston Island reefs and shorelines through Wednesday. Large surf will affect the Papahanaumokuakea Marine National Monument from Nihoa to French Frigate Shoals to Maro Reef beginning early Wednesday. RAINFALL: Heavy rainfall associated with Walaka will continue across Johnston Island through early Wednesday, and may reach rainfall may reach the Papahanaumokuakea Marine National Monument from Nihoa to French Frigate Shoals to Maro Reef late tonight or Wednesday. NEXT ADVISORY ------------- Next intermediate advisory at 800 AM HST. Next complete advisory at 1100 AM HST. $$ Forecaster Jelsema NNNN
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