Weather Alert in Alaska
Hydrologic Outlook issued August 22 at 1:07PM AKDT by NWS Fairbanks AK
AREAS AFFECTED: Howard Pass and the Delong Mountains; Central Brooks Range; South Slopes Of The Central Brooks Range; South Slopes of the Western Brooks Range; Noatak Valley; Lower Kobuk Valley; Northern Seward Peninsula; Upper Kobuk Valleys; Southern Seward Peninsula Coast; Interior Seward Peninsula; Eastern Norton Sound and Nulato Hills; Lower Yukon River; Lower Koyukuk Valley; Middle Yukon Valley; Lower Yukon and Innoko Valleys; Upper Koyukuk Valley; Dalton Highway Summits; Central Interior
DESCRIPTION: ESFAFG Multiple waves of rainfall are expected starting Saturday and continuing through early next week with rainfall totals exceeding 3 inches in many areas of the middle Kuskokwim, middle and lower Yukon, Koyukuk, and Kobuk River basins. Expect increasing river levels on tributaries to these basins starting this weekend and rising water levels on the main stems starting early next week. Highest rainfall totals could exceed 5 inches in isolated areas, typically at higher elevations in the Nulato Hills and the Brooks Range.
INSTRUCTION: N/A
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Weather Topic: What are Mammatus Clouds?
Home - Education - Cloud Types - Mammatus Clouds
Next Topic: Nimbostratus Clouds
A mammatus cloud is a cloud with a unique feature which resembles
a web of pouches hanging along the base of the cloud.
In the United States, mammatus clouds tend to form in the warmer months, commonly
in the Midwest and eastern regions.
While they usually form at the bottom of a cumulonimbis cloud, they can also form
under altostratus, altocumulus, stratocumulus, and cirrus clouds. Mammatus clouds
warn that severe weather is close.
Next Topic: Nimbostratus Clouds
Weather Topic: What is Precipitation?
Home - Education - Precipitation - Precipitation
Next Topic: Rain
Precipitation can refer to many different forms of water that
may fall from clouds. Precipitation occurs after a cloud has become saturated to
the point where its water particles are more dense than the air below the cloud.
In most cases, precipitation will reach the ground, but it is not uncommon for
precipitation to evaporate before it reaches the earth's surface.
When precipitation evaporates before it contacts the ground it is called Virga.
Graupel, hail, sleet, rain, drizzle, and snow are forms of precipitation, but fog
and mist are not considered precipitation because the water vapor which
constitutes them isn't dense enough to fall to the ground.
Next Topic: Rain
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