ZCZC HFOTCPCP1 ALL TTAA00 PHFO DDHHMM BULLETIN Hurricane Walaka Intermediate Advisory Number 8A NWS Central Pacific Hurricane Center Honolulu HI CP012018 800 AM HST Mon Oct 01 2018 ...WALAKA REACHES CATEGORY 4 STATUS FAR SOUTHWEST OF HAWAII... SUMMARY OF 800 AM HST...1800 UTC...INFORMATION ---------------------------------------------- LOCATION...12.6N 168.9W ABOUT 290 MI...465 KM S OF JOHNSTON ISLAND ABOUT 940 MI...1510 KM SW OF HONOLULU HAWAII MAXIMUM SUSTAINED WINDS...145 MPH...235 KM/H PRESENT MOVEMENT...WNW OR 295 DEGREES AT 10 MPH...17 KM/H MINIMUM CENTRAL PRESSURE...935 MB...27.61 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 800 AM HST (1800 UTC), the center of Hurricane Walaka was located near latitude 12.6 North, longitude 168.9 West. Walaka is moving toward the west-northwest near 10 mph (17 km/h). A turn toward the northwest is expected to begin later today, followed by a turn toward the north late tonight through Tuesday night with a gradual increase in forward speed. Maximum sustained winds are near 145 mph (235 km/h) with higher gusts. Walaka is a category 4 hurricane on the Saffir-Simpson Hurricane Wind Scale. Rapid intensification is expected to continue today into tonight, with little change in intensity forecast Tuesday and Tuesday night. Hurricane-force winds extend outward up to 35 miles (55 km) from the center and tropical-storm-force winds extend outward up to 140 miles (220 km). The estimated minimum central pressure is 935 mb (27.61 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 Atoll 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 complete advisory at 1100 AM HST. $$ Forecaster Kodama NNNN