ZCZC HFOTCPCP1 ALL TTAA00 PHFO DDHHMM BULLETIN Hurricane Walaka Advisory Number 9 NWS Central Pacific Hurricane Center Honolulu HI CP012018 1100 AM HST Mon Oct 01 2018 ...CATEGORY 4 HURRICANE WALAKA STILL INTENSIFYING FAR SOUTHWEST OF HAWAII... SUMMARY OF 1100 AM HST...2100 UTC...INFORMATION ----------------------------------------------- LOCATION...12.9N 169.3W ABOUT 265 MI...425 KM S OF JOHNSTON ISLAND ABOUT 950 MI...1530 KM SW OF HONOLULU HAWAII MAXIMUM SUSTAINED WINDS...150 MPH...240 KM/H PRESENT MOVEMENT...NW OR 305 DEGREES AT 10 MPH...17 KM/H MINIMUM CENTRAL PRESSURE...930 MB...27.47 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 Warning means that hurricane conditions are expected in the warning area. A warning is typically issued 36 hours before the anticipated first occurrence of tropical-storm force winds, conditions that make outside preparations difficult or dangerous. Interests in the Papahanaumokuakea Marine National Monument should monitor the progress of Walaka. DISCUSSION AND OUTLOOK ---------------------- At 1100 AM HST (2100 UTC), the eye of Hurricane Walaka was located near latitude 12.9 North, longitude 169.3 West. Walaka is moving toward the northwest near 10 mph (17 km/h). A turn toward the north is expected late tonight through Tuesday with a gradual increase in forward speed. On the forecast track, the center of Walaka is expected to pass just to the west of Johnston Island on Tuesday. Maximum sustained winds are near 150 mph (240 km/h) with higher gusts. Walaka is a category 4 hurricane on the Saffir-Simpson Hurricane Wind Scale. Additional strengthening is expected through early Tuesday before Walaka starts a gradual weakening trend. Hurricane-force winds extend outward up to 50 miles (85 km) from the center and tropical-storm-force winds extend outward up to 160 miles (260 km). The estimated minimum central pressure is 930 mb (27.47 inches). HAZARDS AFFECTING LAND ---------------------- WIND: Tropical storm force winds are expected across Johnston Island starting late tonight or early Tuesday, with hurricane conditions expected by Tuesday afternoon. SURF: Large surf will affect the Johnston Island reefs and shorelines starting later today. RAINFALL: Heavy rainfall associated with Walaka is expected to reach Johnston Atoll late today or tonight. NEXT ADVISORY ------------- Next intermediate advisory at 200 PM HST. Next complete advisory at 500 PM HST. $$ Forecaster Kodama NNNN
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