WTPA31 PHFO 010855 TCPCP1 BULLETIN Hurricane Walaka Advisory Number 7 NWS Central Pacific Hurricane Center Honolulu HI CP012018 1100 PM HST Sun Sep 30 2018 ...WALAKA RAPIDLY INTENSIFYING FAR SOUTHWEST OF HAWAII... SUMMARY OF 1100 PM HST...0900 UTC...INFORMATION ----------------------------------------------- LOCATION...11.9N 167.5W ABOUT 355 MI...575 KM SSE OF JOHNSTON ISLAND ABOUT 905 MI...1460 KM SW OF HONOLULU HAWAII MAXIMUM SUSTAINED WINDS...105 MPH...165 KM/H PRESENT MOVEMENT...W OR 280 DEGREES AT 12 MPH...19 KM/H MINIMUM CENTRAL PRESSURE...970 MB...28.65 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 PM HST (0900 UTC), the center of Hurricane Walaka was located near latitude 11.9 North, longitude 167.5 West. Walaka is moving toward the west near 12 mph (19 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 105 mph (165 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 970 mb (28.65 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 intermediate advisory at 200 AM HST. Next complete advisory at 500 AM HST. $$ Forecaster Jelsema