Weather Alert in Alaska
Red Flag Warning issued July 6 at 9:10AM AKDT until July 8 at 12:00AM AKDT by NWS Fairbanks AK
AREAS AFFECTED: Upper Kobuk Valleys; Lower Koyukuk Valley
DESCRIPTION: The National Weather Service in Fairbanks has issued a Red Flag Warning for lightning, which is in effect from noon Monday to midnight AKDT Monday night. * AFFECTED AREA...Upper Kobuk Valleys and Lower Koyukuk Valley. * TIMING...From noon Monday to midnight AKDT Monday night. * THUNDERSTORM COVERAGE INDEX...4, Scattered to Numerous. * WINDS...West 10 to 20 mph with gusts up to 30 mph. Stronger gusts are possible in thunderstorms. * HUMIDITY...As low as 38 percent. * TEMPERATURES...Highs in the upper 80s. Lows in the mid 40s. * IMPACTS...Numerous wet thunderstorms across the interior will bring frequent lightning strikes and gusty winds.
INSTRUCTION: A Red Flag Warning means that conditions are occurring or will occur which could lead to the development of large and dangerous fires. It is directed toward fire agencies, and through them, to the public. Please advise the appropriate officials or fire crews in the field of this Red Flag Warning.
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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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