Weather Alert in Hawaii

Recent Locations: Trimont, MN Woodruff, WI Kapolei, HI

Current Alerts for Kapolei, HI: Red Flag Warning

Red Flag Warning issued August 2 at 3:08AM HST until August 2 at 6:00PM HST by NWS Honolulu HI

AREAS AFFECTED: Niihau; Kauai South; Kauai Southwest; East Honolulu; Honolulu Metro; Ewa Plain; Waianae Coast; Oahu North Shore; Central Oahu; Waianae Mountains; Molokai North; Molokai West; Molokai Leeward South; Lanai Windward; Lanai Leeward; Lanai South; Lanai Mauka; Kahoolawe; Maui Leeward West; Maui Central Valley North; Maui Central Valley South; South Maui/Upcountry; South Haleakala; Big Island South; Big Island Southeast; Kohala; Big Island Interior

DESCRIPTION: ...RED FLAG WARNING IN EFFECT THROUGH THIS AFTERNOON FOR GUSTY WINDS AND LOW HUMIDITY... .A dry and locally windy trade wind flow will produce critical fire weather conditions through this afternoon. Winds will be strongest over and downwind of terrain. Winds will begin a slow decline on Sunday, though near critical fire weather conditions are expected as dry weather persists over leeward areas. * AFFECTED AREA...Leeward portions of all Hawaiian Islands and interior sections of the Big Island. * TIMING...Until 6 PM HST this evening. * WINDS...East 15 to 30 mph with gusts up to 35 mph on Oahu and Kauai, and gusts up to 50 mph in Maui County and on the Big Island. * RELATIVE HUMIDITY...Lowering to 35 to 45 percent in the afternoon hours. * IMPACTS...A combination of strong winds, low relative humidity, and dry fuels can contribute to extreme fire behavior. Any fires that develop will likely spread rapidly. A Red Flag Warning does not predict new fire starts.

INSTRUCTION: Outdoor burning is not recommended. Heat from vehicle exhaust systems can ignite dry grass. Park cars on areas that are paved or where vegetation is trimmed and cleared. High winds contribute to wildfire hazard. Delay activities that could throw off sparks until the wind dies down. A Red Flag Warning means that critical fire weather conditions are either occurring now or will shortly. A combination of strong winds, low relative humidity, and warm temperatures can contribute to extreme fire behavior. A Red Flag Warning does not predict new fire starts.

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Weather Topic: What is Rain?

Home - Education - Precipitation - Rain

Rain Next Topic: Shelf Clouds

Precipitation in the form of water droplets is called rain. Rain generally has a tendency to fall with less intensity over a greater period of time, and when rainfall is more severe it is usually less sustained.

Rain is the most common form of precipitation and happens with greater frequency depending on the season and regional influences. Cities have been shown to have an observable effect on rainfall, due to an effect called the urban heat island. Compared to upwind, monthly rainfall between twenty and forty miles downwind of cities is 30% greater.

Next Topic: Shelf Clouds

Weather Topic: What is Sleet?

Home - Education - Precipitation - Sleet

Sleet Next Topic: Snow

Sleet is a form of precipitation in which small ice pellets are the primary components. These ice pellets are smaller and more translucent than hailstones, and harder than graupel. Sleet is caused by specific atmospheric conditions and therefore typically doesn't last for extended periods of time.

The condition which leads to sleet formation requires a warmer body of air to be wedged in between two sub-freezing bodies of air. When snow falls through a warmer layer of air it melts, and as it falls through the next sub-freezing body of air it freezes again, forming ice pellets known as sleet. In some cases, water droplets don't have time to freeze before reaching the surface and the result is freezing rain.

Next Topic: Snow