Weather Alert in Hawaii
Flood Watch issued February 21 at 1:37AM HST until February 21 at 6:00PM HST by NWS Honolulu HI
AREAS AFFECTED: Niihau; Kauai Southwest; Kauai Mountains; Kauai North; Kauai East; Kauai South
DESCRIPTION: ...FLOOD WATCH IN EFFECT FOR NIIHAU KAUAI AND OAHU THROUGH THIS AFTERNOON FOR KAUAI COUNTY AND OAHU... * WHAT...Flash flooding caused by excessive rainfall continues to be possible. * WHERE...Niihau and Kauai. * WHEN...Through this afternoon. * IMPACTS...Flood prone roads and other low lying areas may be closed due to elevated runoff and overflowing streams. Urban areas may receive more significant flooding and property damage due to rapid runoff. * ADDITIONAL DETAILS... - An upper level trough swinging through the northwestern islands today will produce periods of heavy showers and isolated thunderstorms. The trough axis should lift north of the area later this afternoon, which should diminish the flooding threat.
INSTRUCTION: You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued.
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Weather Topic: What is Freezing Rain?
Home - Education - Precipitation - Freezing Rain
Next Topic: Graupel
Freezing rain is a condition where precipitation which has fallen in the form of
water droplets reaches temperatures which are below freezing and freezes upon
coming into contact
with surface objects. The result of this precipitation is a glaze of ice which
can be damaging to plants and man-made structures. A severe onset of freezing
rain which results in a very thick glaze of ice is known as an ice storm.
Next Topic: Graupel
Weather Topic: What is Hail?
Home - Education - Precipitation - Hail
Next Topic: Hole Punch Clouds
Hail is a form of precipitation which is recognized by large solid balls or
clumps of ice. Hail is created by thunderstorm clouds with strong updrafts of wind.
As the hailstones remain in the updraft, ice is deposited onto them until their
weight becomes heavy enough for them to fall to the earth's surface.
Hail storms can cause significant damage to crops, aircrafts, and man-made structures,
despite the fact that the duration is usually less than ten minutes.
Next Topic: Hole Punch Clouds
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