Public Advisory for HURRICANE ISELLE

Raw Text File

HURRICANE ISELLE INTERMEDIATE ADVISORY NUMBER 29A

Issued: 200 AM HST THU AUG 07 2014

Iselle taking aim at the Big Island of Hawaii

SUMMARY OF 200 AM HST...1200 UTC...INFORMATION

LOCATION: 18.2N 150.0W
ABOUT 350 MI: 560 KM ESE OF HILO HAWAII
ABOUT 560 MI: 900 KM ESE OF HONOLULU HAWAII
MAXIMUM SUSTAINED WINDS: 85 MPH: 140 KM/H
PRESENT MOVEMENT: WNW OR 285 DEGREES AT 18 MPH: 30 KM/H
MINIMUM CENTRAL PRESSURE: 985 MB or 29.09 INCHES

DISCUSSION AND 48-HOUR OUTLOOK

At 200 am HST, 1200 UTC, the center of hurricane Iselle was located near latitude 18.2 north, longitude 150.0 west. Iselle is moving toward the west-northwest near 18 mph, 30 km/h, and this motion is expected to continue through Thursday, with some slowing in forward speed on Friday. 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 85 mph, 140 km/h, with higher gusts. Some weakening is forecast during the next 48 hours, but 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 latest minimum central pressure reported by reconnaissance aircraft was 985 mb, 29.09 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, and for Oahu late tonight and Friday. Tropical storm conditions are possible for Kauai county on Friday.

SURF

Very large and damaging surf is expected to rapidly build along east and south shores today, continuing into Friday.

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...500 AM HST.

$$

FORECASTER BIRCHARD