ZCZC HFOTCPCP1 ALL TTAA00 PHFO DDHHMM BULLETIN Hurricane Walaka Intermediate Advisory Number 7A NWS Central Pacific Hurricane Center Honolulu HI CP012018 200 AM HST Mon Oct 01 2018 ...WALAKA BECOMES A MAJOR HURRICANE FAR SOUTHWEST OF HAWAII... SUMMARY OF 200 AM HST...1200 UTC...INFORMATION ---------------------------------------------- LOCATION...12.1N 167.9W ABOUT 335 MI...540 KM SSE OF JOHNSTON ISLAND ABOUT 915 MI...1475 KM SW OF HONOLULU HAWAII MAXIMUM SUSTAINED WINDS...115 MPH...185 KM/H PRESENT MOVEMENT...WNW OR 290 DEGREES AT 10 MPH...17 KM/H MINIMUM CENTRAL PRESSURE...961 MB...28.38 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 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 200 AM HST (1200 UTC), the center of Hurricane Walaka was located near latitude 12.1 North, longitude 167.9 West. Walaka is moving toward the west-northwest near 10 mph (17 km/h). This motion is expected to continue tonight, with a turn toward the northwest on Monday, followed by a turn toward the north with an increase in forward speed on Tuesday and Tuesday night. Maximum sustained winds are near 115 mph (185 km/h) with higher gusts. Rapid intensification is expected tonight and Monday with little change in intensity forecast Monday night through Tuesday night. Hurricane-force winds extend outward up to 30 miles (45 km) from the center and tropical-storm-force winds extend outward up to 125 miles (205 km). The estimated minimum central pressure is 961 mb (28.38 inches). HAZARDS AFFECTING LAND ---------------------- WIND: Tropical Storm force winds are expected across Johnston Island starting late Monday night or early Tuesday, with Hurricane conditions expected by Tuesday afternoon. SURF: Large surf will affect the Johnston Atoll reefs and shorelines starting late Monday. RAINFALL: Heavy rainfall associated with Walaka may reach Johnston Atoll late Monday or Monday night. NEXT ADVISORY ------------- Next complete advisory at 500 AM HST. $$ Forecaster Jelsema NNNN
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