Public Advisory for HURRICANE ISELLE

Raw Text File

HURRICANE ISELLE ADVISORY NUMBER 31

Issued: 1100 AM HST THU AUG 07 2014

Iselle weaker but remains a significant threat to Hawaii

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

LOCATION: 18.9N 152.2W
ABOUT 195 MI: 315 KM ESE OF HILO HAWAII
ABOUT 405 MI: 650 KM ESE OF HONOLULU HAWAII
MAXIMUM SUSTAINED WINDS: 75 MPH: 120 KM/H
PRESENT MOVEMENT: WNW OR 285 DEGREES AT 16 MPH: 26 KM/H
MINIMUM CENTRAL PRESSURE: 991 MB or 29.27 INCHES

WATCHES AND WARNINGS

CHANGES IN WATCHES AND WARNINGS WITH THIS ADVISORY,

NONE.

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 1100 am HST, 2100 UTC, the center of hurricane Iselle was located near latitude 18.9 north, longitude 152.2 west. Iselle continues to move toward the west-northwest near 16 mph, 26 km/h, and this motion is expected to continue through Friday. On the forecast track, Iselle will be moving over the Big Island tonight, and passing south of the smaller islands on Friday.

Maximum sustained winds are near 75 mph, 120 km/h, with higher gusts. Weakening is forecast during the next 48 hours, and Iselle may weaken to a tropical storm 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 991 mb, 29.27 inches.

HAZARDS AFFECTING LAND

WIND

Conditions will steadily deteriorate over the Big Island this afternoon, with tropical storm conditions expected to arrive well before dark. Hurricane conditions are likely for portions of the Big Island tonight. Tropical storm conditions are expected over Maui county tonight, and for Oahu late tonight and Friday. Tropical storm conditions are expected for Kauai county later 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.

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.

STORM SURGE

The combination of 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 2 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