The Central Pacific Hurricane Center is issuing specific bulletins for locations across the eastern end of the Hawaiian Islands. The 1 p.m. narrative is as follows:
Tropical storm Darby is continuing its steady March toward the Big Island at midday. The center of Darby will be approaching the Big Island Saturday morning and will pass very near, or over, the Big Island on Saturday. A gradual turn toward the northwest is expected later Saturday, with the center of Darby expected to pass very near, or over, Maui county Saturday night. However, rain and wind will increase well ahead of the center.
Probability of tropical storm/hurricane conditions
For the Big Island, the chance for damaging tropical storm conditions at Hilo is 63 percent, 53 percent at bradshaw field, 27 percent at South Point, and 42 percent at Kailua-Kona.
For Maui county, the chance for damaging tropical storm conditions at Kahului is 51 percent, 55 percent at Hana, 42 percent at Lanai city, and 43 percent at Kaunakakai.
Based on the latest forecast track, tropical storm force winds over 39 mph are expected to begin overspreading the Big Island late tonight, and Maui county on Saturday. In some areas, winds will be as high as 50 to 60 mph with gusts to 70 mph. Even higher gusts will be possible over mountainous terrain, through passes, and where winds blow downslope. These effects can occur well away from the center of Darby.
Homes may have damage to roofs, siding, gutters and windows, especially if these items are not properly secured. Loose outdoor items will become airborne, causing additional damage and possible injury.
Many power lines will be knocked down by falling trees, resulting in extended power outages in some areas. Many large branches of trees will be snapped, and many weaker trees will be snapped or uprooted.
Storm surge and storm tide
A high surf warning is in effect for east facing shores of the Big Island and Maui. Surf is expected to build to 15 to 25 feet today with occasional higher sets. This may cause significant wave runup and damage on some windward coastal roads. Refer to the high surf warning for more details.
A flash flood watch is in effect. Showers will increase on the Big Island tonight, followed by heavy rain and squalls with embedded thunderstorms Saturday into Sunday. These conditions will spread to Maui county on Saturday as well. Refer to the flash flood watch for more details on the flood threat from Darby.
Your preparations should be rushed to completion. In a tropical storm, conditions can change quickly. Evacuate if directed to do so by local officials, or if your home is vulnerable to high winds or flooding.
Secure outdoor objects which can be blown around and cause additional damage.
Tropical storms can bring intense rain leading to severe flash flooding. People near streams, rivers, and other flood prone areas are urged to be especially alert to flash flooding.
Cancel any beach activities until further notice. Persons living near the shore should be prepared to evacuate quickly should building surf threaten. Other outdoor activities, including camping and hiking, should be postponed until after the storm.
The next local statement will be issued around 6:30 pm HST, or sooner if conditions warrant.