Weather Alert in Hawaii
Flood Watch issued February 21 at 4:40PM HST until February 22 at 6:00AM HST by NWS Honolulu HI
AREAS AFFECTED: Waianae Coast; Oahu North Shore; Olomana; Central Oahu; Waianae Mountains; East Honolulu; Honolulu Metro; Ewa Plain; Koolau Windward; Koolau Leeward
DESCRIPTION: ...FLOOD WATCH NOW IN EFFECT THROUGH LATE TONIGHT FOR KAUAI COUNTY AND OAHU... * WHAT...Flash flooding caused by excessive rainfall continues to be possible. * WHERE...Oahu. * WHEN...Through late tonight. * 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... - A vigorous upper level trough continues to slowly swing through the state this afternoon and will continue to bring unstable weather conditions through tonight. Heavy showers and isolated thunderstorms will continue to be possible overnight tonight. The trough axis should lift north of the area by Sunday morning, 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 Graupel?
Home - Education - Precipitation - Graupel
Next Topic: Hail
Graupel is a form of precipitation that is created by atmospheric conditions
which cause supercooled water droplets to contact snow crystals and freeze to
their surface.
Sometimes known as soft hail or snow pellets, graupel is delicate and easily
destroyed by touch. Whereas hail usually falls during severe weather, graupel
doesn't require such conditions to form, and can form in mild precipitation
similar to situations which produce snowfall.
Next Topic: Hail
Weather Topic: What are Hole Punch Clouds?
Home - Education - Cloud Types - Hole Punch Clouds
Next Topic: Mammatus Clouds
A hole punch cloud is an unusual occurrence when a disk-shaped
hole appears in a cirrostratus, cirrocumulus, or altocumulus cloud.
When part of the cloud forms ice crystals, water droplets in the surrounding area
of the cloud evaporate. The effect of this process produces a large elliptical
gap in the cloud. The hole punch cloud formation is rare, but it is not specific
to any geographic area.
Other names which have been used to describe this phenomena include fallstreak hole,
skypunch, and cloud hole.
Next Topic: Mammatus Clouds
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