Weather Alert in Alaska
Flood Warning issued August 29 at 9:03AM AKDT until August 30 at 12:00PM AKDT by NWS Fairbanks AK
AREAS AFFECTED: Upper Koyukuk Valley
DESCRIPTION: * WHAT...Flooding caused by excessive rainfall is occurring. * WHERE...Koyukuk River near Allakaket. * WHEN...Until noon AKDT Saturday. * IMPACTS...Flooding of rivers, creeks, streams, and other low-lying and flood-prone locations is imminent or occurring. * ADDITIONAL DETAILS... - As of Friday morning the public reported flooding in Allakaket. Additional rainfall amounts of 0.2 to 0.5 inches are possible through Saturday morning. - The Koyukuk River below the John River crested yesterday but is remaining high. Models are indicating that Koyukuk at Allakaket could see additional water level rises of 1-2 ft before the river crests this evening. - Low lying roads are currently flooded and airport access may be cut off. - http://www.weather.gov/aprfc
INSTRUCTION: Please take appropriate actions to preserve life and property.
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Weather Topic: What are Nimbostratus Clouds?
Home - Education - Cloud Types - Nimbostratus Clouds
Next Topic: Precipitation
A nimbostratus cloud is similar to a stratus cloud in its formless,
smooth appearance. However, a nimbostratus cloud is darker than a stratus cloud,
because it is thicker.
Unlike a stratus cloud, a nimbostratus cloud typically brings with it the threat
of moderate to heavy precipitation. In some cases, the precipitation may evaporate
before reaching the ground, a phenomenon known as virga.
Next Topic: Precipitation
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
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