Weather advisory map via National Weather Service/NOAA

Flash Flood Watch

The National Weather Service in Honolulu has issued a Flash Flood Watch for the entire state of Hawaii from Thursday morning (April 19) through Friday afternoon.

Deep moisture associated with an old frontal boundary lingering across the state in combination with an upper-level trough moving through the area, will bring the threat for heavy rainfall and flash flooding. The heaviest rainfall is expected to fall from Oahu eastward to the Big Island. Even though widespread heavy rainfall is not expected on Kauai, many areas have recently received a significant amount of rainfall and the soils remain saturated. As a result, even moderate rain falling for an extended period in these harder hit areas of Kauai could lead to Flash Flooding.

Campers and hikers should avoid low lying flood prone areas. People should stay away from streams, drainage ditches and low lying areas prone to flooding. The rainfall and runoff will cause hazardous driving conditions due to ponding, reduced visibility, and poor braking action. Excessive runoff may cause rockslides and mudslides in steep terrain. Remember, if lightning does threaten your area, the safest place to be is indoors.

Debris in streams and gulches may clog bridges and culverts resulting in flooding outside normal water channels causing damage.

Do not cross fast flowing or rising water in your vehicle or on foot. Turn around, don’t drown.

To report a power outage call HELCO at (808) 969-6666.

More information about reporting outages at: http://www.hawaiielectriclight.com/helco/Safety-and-Emergency/Storm-Center/Report-an-Outage

Winter Storm Watch

A Winter Storm Watch will be in effect from Thursday morning (April 19) through Friday afternoon for Hawaii Island summits above 12,000 feet.

Heavy snow is possible with accumulations of 6-12 inches being possible.

Roads to the summits may rapidly become snow covered and slippery, resulting in difficult travel conditions. Significant reductions in visibility are also possible.

For updated information on summit road conditions visit: http://mkwc.ifa.hawaii.edu/current/road-conditions/

Small Craft Advisory

A Small Craft Advisory is in effect until 6 a.m. Thursday (April 19) for the Kaiwi Channel, Maui County windward waters, Maalaea Bay, the Pailolo and Alenuihaha Channels, Hawaii Island windward, leeward and southeast waters.

East winds of 15-25 knots and seas 7-10 feet are forecast.

A Small Craft Advisory means that winds speeds of 25 to 33 knots and/or seas 10 feet or greater are expected to produce conditions hazardous to small craft. Inexperienced mariners, especially those operating smaller vessels, should avoid navigating in these conditions.

For links to the latest weather forecasts, reports, radar and satellite imagery visit our Weather Page at hawaii247.com/weather