Weather Alert in Hawaii
Flood Advisory issued February 7 at 3:23PM HST until February 7 at 5:30PM HST by NWS Honolulu HI
AREAS AFFECTED: Hawaii in Hawaii, HI
DESCRIPTION: * WHAT...Flooding caused by excessive rainfall continues. * WHERE...The island of Hawaii in Hawaii County. * WHEN...Until 530 PM HST. * IMPACTS...Minor flooding on roads, poor drainage areas, and in streams. * ADDITIONAL DETAILS... - At 323 PM HST, radar indicated heavy rain over the North Kohala District of the Big Island. Rain rates have decreased to around 1 inch per hour. The heaviest rain is still falling in Waipio Valley. - Some locations that will experience flooding include... Kapaau, Pololu Valley, Waimanu Valley, Waipio Valley, Halaula, Kohala Ranch, Kamuela, Kukuihaele and Hawi.
INSTRUCTION: Stay away from streams, drainage ditches and low lying areas prone to flooding. A Flood Watch is also in effect for all Hawaiian Islands through Monday afternoon.
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Weather Topic: What is Rain?
Home - Education - Precipitation - 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
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
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