Weather Alert in South Dakota
Red Flag Warning issued February 16 at 4:51PM MST until February 17 at 6:00PM MST by NWS Rapid City SD
AREAS AFFECTED: Northern Foot Hills; Butte County Area; Northern Campbell; Crook County Plains
DESCRIPTION: ...CRITICAL FIRE WEATHER CONDITIONS TUESDAY... .Very dry air will spread across the region Tuesday, with RH's expected into the mid teens to lower 20s. In addition, strong gusty westerly winds will develop with some areas seeing gusts over 60 mph, especially portions of northeast WY and far southwest SD. The combination of receptive fuels, strong gusty winds, and very low RH will support critical fire weather conditions. The National Weather Service in Rapid City has issued a Red Flag Warning for gusty winds and low relative humidity, which is in effect from 11 AM to 6 PM MST Tuesday. * AFFECTED AREA...Fire Weather Zones 314 Northern Campbell, 316 Crook County Plains, 323 Northern Foot Hills and 327 Butte County Area. * WINDS...West 25 to 35 mph with gusts up to 55 mph. * RELATIVE HUMIDITY...As low as 20 percent. * IMPACTS...The combination of gusty winds and low relative humidity will produce critical fire weather conditions.
INSTRUCTION: A Red Flag Warning means that critical fire weather conditions are either occurring now, or will shortly. A combination of strong winds, low relative humidity, and warm temperatures can contribute to extreme fire behavior.
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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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