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HURRICANE ISELLE ADVISORY NUMBER 30

Issued: 500 AM HST THU AUG 07 2014

Dangerous Iselle bearing down on the Big Island

SUMMARY OF 500 AM HST...1500 UTC...INFORMATION

LOCATION: 18.5N 150.6W
ABOUT 305 MI: 490 KM ESE OF HILO HAWAII
ABOUT 510 MI: 825 KM ESE OF HONOLULU HAWAII
MAXIMUM SUSTAINED WINDS: 80 MPH: 130 KM/H
PRESENT MOVEMENT: WNW OR 285 DEGREES AT 17 MPH: 28 KM/H
MINIMUM CENTRAL PRESSURE: 986 MB or 29.12 INCHES

WATCHES AND WARNINGS

CHANGES IN WATCHES AND WARNINGS WITH THIS ADVISORY,

A TROPICAL STORM WARNING HAS BEEN ISSUED FOR KAUAI COUNTY.

SUMMARY OF WATCHES AND WARNINGS IN EFFECT,

A HURRICANE WARNING IS IN EFFECT FOR,
* HAWAII COUNTY

A TROPICAL STORM WARNING IS IN EFFECT FOR,
* MAUI COUNTY, INCLUDING THE ISLANDS OF MAUI, MOLOKAI, LANAI,
AND KAHOOLAWE.
* OAHU
* KAUAI COUNTY INCLUDING THE ISLANDS OF KAUAI AND NIIHAU.

A HURRICANE WARNING MEANS THAT HURRICANE CONDITIONS ARE EXPECTED
SOMEWHERE WITHIN THE WARNING AREA. PREPARATIONS TO PROTECT LIFE AND
PROPERTY SHOULD BE RUSHED TO COMPLETION.

A TROPICAL STORM WARNING MEANS THAT TROPICAL STORM CONDITIONS ARE
EXPECTED SOMEWHERE WITHIN THE WARNING AREA WITHIN 36 HOURS.

INTERESTS IN THE NORTHWEST HAWAIIAN ISLANDS SHOULD MONITOR THE
PROGRESS OF ISELLE.

FOR STORM INFORMATION SPECIFIC TO YOUR AREA, PLEASE MONITOR
PRODUCTS ISSUED BY THE NATIONAL WEATHER SERVICE OFFICE IN
HONOLULU HAWAII.

DISCUSSION AND 48-HOUR OUTLOOK

At 500 am HST, 1500 UTC, the center of hurricane Iselle was located near latitude 18.5 north, longitude 150.6 west. Iselle is moving toward the west-northwest near 17 mph, 28 km/h, and this motion is expected to continue through Friday, with some slowing in forward speed on Friday night. On the forecast track, the center of Iselle is expected to pass over the Big Island tonight, and pass just south of the smaller islands Friday.

Maximum sustained winds are near 80 mph, 130 km/h, with higher gusts. Some weakening is forecast during the next 48 hours, but Iselle is expected to be near hurricane strength as it makes landfall on the Big Island tonight.

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 986 mb, 29.12 inches.

HAZARDS AFFECTING LAND

WIND

The onset of tropical storm conditions is expected on the Big Island of Hawaii this afternoon, with hurricane conditions expected tonight. Tropical storm conditions are expected over Maui county tonight, over Oahu on Friday, and over Kauai county on Friday afternoon.

SURF

Very large and damaging surf is expected to rapidly build along east and south facing shores today and tonight, especially on the Big Island.

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 INTERMEDIATE ADVISORY...800 AM HST.
NEXT COMPLETE ADVISORY...1100 AM HST.

$$

FORECASTER BIRCHARD