Weather Alert in Idaho
Red Flag Warning issued August 15 at 3:52AM MDT until August 15 at 9:00PM MDT by NWS Pocatello ID
AREAS AFFECTED: Caribou Range/Caribou NF; Goose Creek and Raft River Valley/Southern Sawtooth NF/Twin Falls BLM south of the Snake River
DESCRIPTION: ...RED FLAG WARNING REMAINS IN EFFECT FROM NOON TO 9 PM MDT TODAY FOR SCATTERED THUNDERSTORMS FOR FIRE WEATHER ZONES 413 AND 427... * AFFECTED AREA...Fire Weather Zone 413 Caribou Range/Caribou NF and Fire Weather Zone 427 Goose Creek and Raft River Valley/Southern Sawtooth NF/Twin Falls BLM south of the Snake River. * THUNDERSTORMS...25 to 45 percent coverage. * OUTFLOW WINDS...A dry low level environment will promote stronger storms capable of producing wind gusts up to 55 to 60 mph with isolated stronger gusts to 65 mph. * IMPACTS...Critical fire weather conditions are expected Friday afternoon and evening. Lightning may generate new fire starts. Any new fire starts or existing fires may spread rapidly.
INSTRUCTION: A Red Flag Warning means that critical fire weather conditions are either occurring now, or will shortly based on these criteria for Southeastern Idaho: - Relative humidity at or below 15 percent and wind gusts of at least 25 mph in the mountains, or 30 mph in the Snake Plain. - Thunderstorm coverage of 25 percent, without specific rainfall criteria. - Other high impact events deemed critical by the National Weather Service and area fire management agencies.
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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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