Weather Alert in Alaska
Flood Watch issued August 27 at 11:46AM AKDT until August 29 at 12:00PM AKDT by NWS Fairbanks AK
AREAS AFFECTED: Noatak Valley; Lower Koyukuk Valley; Upper Koyukuk Valley
DESCRIPTION: Heavy rainfall that caused rapid rises in headwater streams will continue to cause water level rises on main stem rivers through the end of the week. The Koyukuk River is expected to crest at Allakaket overnight on Wednesday, timing of the Alatna River crest at the confluence with the Koyukuk may be coincident. The Kobuk River is cresting at Kobuk today and may stay high or have another rise through the end of the week due to continued rainfall. * WHAT...Flooding caused by excessive rainfall continues to be possible. * WHERE...Including the following areas, Lower Koyukuk Valley, Noatak Valley and Upper Koyukuk Valley. This includes the cities of Noatak, Red Dog Mine, Huslia, Hughes, Allakaket, Bettles, Evansville, And Alatna. * WHEN...Through Friday evening * IMPACTS...Excessive runoff may result in flooding of rivers, creeks, streams, and other low-lying and flood-prone locations. Area creeks and streams are running high and could flood with more heavy rain. Flooding may occur in poor drainage areas. * ADDITIONAL DETAILS... - Moderate rainfall will continue in the Southern Brooks Range on areas already saturated by heavy rainfall this week. - Http://www.weather.gov/aprfc
INSTRUCTION: Persons living along streams should stay alert and be prepared to take action if a warning or advisory is issued, or flooding is observed. You should monitor later forecasts and be alert for possible Flood Warnings. Those living in areas prone to flooding should be prepared to take action should flooding develop. Stay tuned to further developments by listening to your local radio, television, or NOAA Weather Radio for further information.
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Weather Topic: What are Fractus Clouds?
Home - Education - Cloud Types - Fractus Clouds
Next Topic: Freezing Rain
A fractus cloud (scud) is a fragmented, tattered cloud which has
likely been sheared off of another cloud. They are accessory clouds, meaning they
develop from parent clouds, and are named in a way which describes the original
cloud which contained them.
Fractus clouds which have originated from cumulus clouds are referred to as
cumulus fractus, while fractus clouds which have originated from stratus clouds
are referred to as stratus fractus. Under certain conditions a fractus cloud might
merge with another cloud, or develop into a cumulus cloud, but usually a
fractus cloud seen by itself will dissipate rapidly.
They are often observed on the leading and trailing edges of storm clouds,
and are a display of wind activity.
Next Topic: Freezing Rain
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
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