ZCZC HFOTCPCP1 ALL TTAA00 PHFO DDHHMM BULLETIN Hurricane Walaka Intermediate Advisory Number 6A NWS Central Pacific Hurricane Center Honolulu HI CP012018 800 PM HST Sun Sep 30 2018 ...WALAKA STRENGTHENS TO A HURRICANE FAR SOUTHWEST OF HAWAII... SUMMARY OF 800 PM HST...0600 UTC...INFORMATION ---------------------------------------------- LOCATION...11.7N 166.8W ABOUT 390 MI...630 KM SSE OF JOHNSTON ISLAND ABOUT 890 MI...1430 KM SW OF HONOLULU HAWAII MAXIMUM SUSTAINED WINDS...100 MPH...160 KM/H PRESENT MOVEMENT...W OR 275 DEGREES AT 12 MPH...19 KM/H MINIMUM CENTRAL PRESSURE...970 MB...28.64 INCHES WATCHES AND WARNINGS -------------------- CHANGES WITH THIS ADVISORY: A Hurricane Warning is now in effect for Johnston Atoll. 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 PM HST (0600 UTC), the center of Hurricane Walaka was located near latitude 11.7 North, longitude 166.8 West. Walaka is moving toward the west near 12 mph (19 km/h) and this motion is expected to slow and become northwest on Monday, then north on Tuesday. Maximum sustained winds are near 100 mph (160 km/h) with higher gusts. Rapid intensification is forecast through Tuesday. Hurricane-force winds extend outward up to 25 miles (35 km) from the center and tropical-storm-force winds extend outward up to 90 miles (150 km). The estimated minimum central pressure is 970 mb (28.64 inches). HAZARDS AFFECTING LAND ---------------------- WIND: Tropical Storm force winds are expected across Johnston Island starting early Tuesday, with Hurricane conditions expected by Tuesday afternoon. SURF: Large surf will affect the Johnston Atoll reefs and shorelines starting Tuesday. RAINFALL: Heavy rainfall associated with Walaka may reach Johnston Atoll by Monday or Monday night. NEXT ADVISORY ------------- Next complete advisory at 1100 PM HST. $$ Forecaster Jelsema NNNN
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