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HURRICANE ISELLE ADVISORY NUMBER 27

Issued: 1100 AM HST WED AUG 06 2014

Iselle marching steadily toward Hawaii and has not weakened

SUMMARY OF 1100 AM HST...2100 UTC...INFORMATION

LOCATION: 17.2N 145.9W
ABOUT 625 MI: 1010 KM ESE OF HILO HAWAII
ABOUT 830 MI: 1340 KM ESE OF HONOLULU HAWAII
MAXIMUM SUSTAINED WINDS: 90 MPH: 150 KM/H
PRESENT MOVEMENT: WNW OR 285 DEGREES AT 16 MPH: 26 KM/H
MINIMUM CENTRAL PRESSURE: 982 MB or 29.00 INCHES

DISCUSSION AND 48-HOUR OUTLOOK

At 1100 am HST, 2100 UTC, the eye of hurricane Iselle was located by u.s. Air force hurricane hunters near latitude 17.2 north, longitude 145.9 west. Iselle is moving toward the west-northwest near 16 mph, 26 km/h, and this motion is expected to continue for the next couple of days. On the forecast track, Iselle will pass near the Big Island of Hawaii Thursday night.

Data from the reconnaisance aircraft indicated maximum sustained winds are near 90 mph, 150 km/h, with higher gusts. Some weakening is forecast during the next 48 hours. However, Iselle may still be a hurricane as it passes near the Big Island.

Hurricane force winds extend outward up to 35 miles, 55 km, from the center, and tropical storm force winds extend outward up to 115 miles, 185 km.

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

HAZARDS AFFECTING LAND

WIND

Tropical storm conditions are expected on the Big Island of Hawaii Thursday, with hurricane conditions expected Thursday night. Tropical storm conditions are expected for portions of Maui county Thursday night. Tropical storm conditions are possible over Oahu Thursday night or Friday.

SURF

Swells generated by Iselle will reach the main Hawaiian islands today, with large, damaging surf expected along mainly east and south shores starting late tonight or Thursday.

RAINFALL

Iselle is expected to produce rainfall amounts of 5 to 8 inches, with isolated maximum amounts to 12 inches. These rains could cause life-threatening flash floods and 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...200 PM HST.
NEXT COMPLETE ADVISORY...500 PM HST.

$$
FORECASTER R BALLARD