Public Advisory for HURRICANE ISELLE

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HURRICANE ISELLE INTERMEDIATE ADVISORY NUMBER 28A

Issued: 800 PM HST WED AUG 06 2014

Dangerous Iselle moving toward Hawaii

SUMMARY OF 800 PM HST...0600 UTC...INFORMATION

LOCATION: 18.0N 148.4W
ABOUT 450 MI: 725 KM ESE OF HILO HAWAII
ABOUT 660 MI: 1060 KM ESE OF HONOLULU HAWAII
MAXIMUM SUSTAINED WINDS: 90 MPH: 150 KM/H
PRESENT MOVEMENT: WNW OR 285 DEGREES AT 18 MPH: 30 KM/H
MINIMUM CENTRAL PRESSURE: 982 MB or 29.00 INCHES

DISCUSSION AND 48-HOUR OUTLOOK

At 800 pm HST, 0600 UTC, the center of hurricane Iselle was located near latitude 18.0 north, longitude 148.4 west. Iselle is moving toward the west-northwest near 18 mph, 30 km/h, and this motion is expected to continue for the next 48 hours. On the forecast track, the center of Iselle is expected to pass very near or over the Big Island Thursday night, and pass just south of the smaller islands Friday.

Maximum sustained winds are near 90 mph, 150 km/h, with higher gusts. Some weakening is forecast during the next 48 hours. However, Iselle is still expected to be near hurricane strength as it passes near or over the Big Island.

Hurricane force winds extend outward up to 45 miles, 75 km, from the center, and tropical storm force winds extend outward up to 140 miles, 220 km.

The estimated minimum central pressure is 982 mb, 29.00 inches.

HAZARDS AFFECTING LAND

WIND

The onset of tropical storm conditions is expected on the Big Island of Hawaii Thursday afternoon, with hurricane conditions expected Thursday night. Tropical storm conditions are expected over Maui county Thursday night, and for Oahu late Thursday night and Friday. Tropical storm conditions are possible for Kauai county on Friday.

SURF

Swells generated by Iselle will continue to build along east facing shores tonight. Very large, damaging surf is expected along mainly east and south shores starting early Thursday.

RAINFALL

Rainfall totals of 5 to 8 inches, with isolated maximum amounts to 12 inches, are expected along the track of Iselle. These rains could cause life-threatening flash floods as well as rock and mud slides.

STORM SURGE

The combination of a dangerous storm surge and the tide will cause normally dry areas near the coast to be flooded by rising waters. The water could reach the following heights above ground if the peak surge occurs at the time of high tide,.

Big island windward and Kau, 1 to 3 ft.

The highest water will occur along the immediate coast in areas of onshore flow. The surge will be accompanied by large and damaging waves. Surge related flooding depends on the relative timing of the surge and the tidal cycle, and can vary greatly over short distances.

NEXT ADVISORY
NEXT COMPLETE ADVISORY...1100 PM HST.

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FORECASTER BIRCHARD