Weather Alert in South Dakota
Fire Weather Watch issued February 15 at 9:30PM MST until February 17 at 6:00PM MST by NWS Rapid City SD
AREAS AFFECTED: Central Black Hills; Southern Black Hills; Fall River County Area; Eastern Foot Hills; Custer County Plains; Pine Ridge Area; West Central Plains; Haakon County Area; Badlands Area; Bennett County Area; Mellette and Todd Counties; Tripp County; Southern Campbell; Weston County Plains
DESCRIPTION: ...CRITICAL FIRE WEATHER CONDITIONS POSSIBLE TUESDAY... .Very dry air will spread across the region Tuesday, with RH's expected into the mid to lower teens. In addition, strong gusty westerly winds will develop with some areas seeing gusts over 50 mph, especially portions of northeast WY and far southwest SD. The combination of receptive fuels, strong gusty winds, and very low RH would support critical fire weather conditions. The National Weather Service in Rapid City has issued a Fire Weather Watch for gusty winds and low relative humidity, which is in effect from Tuesday morning through Tuesday afternoon. * AFFECTED AREA...Fire Weather Zones 315 Southern Campbell, 317 Weston County Plains, 320 Central Black Hills, 321 Southern Black Hills, 322 Fall River County Area, 324 Eastern Foot Hills, 325 Custer County Plains, 326 Pine Ridge Area, 329 West Central Plains, 331 Haakon County Area, 332 Badlands Area, 333 Bennett County Area, 334 Mellette and Todd Counties and 335 Tripp County. * WINDS...West 25 to 35 mph with gusts up to 55 mph. * RELATIVE HUMIDITY...As low as 15 percent. * IMPACTS...The combination of gusty winds and low relative humidity would produce critical fire weather conditions.
INSTRUCTION: A Fire Weather Watch means that critical fire weather conditions are forecast to occur. Listen for later forecasts and possible Red Flag Warnings.
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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
Weather Topic: What are Shelf Clouds?
Home - Education - Cloud Types - Shelf Clouds
Next Topic: Sleet
A shelf cloud is similar to a wall cloud, but forms at the front
of a storm cloud, instead of at the rear, where wall clouds form.
A shelf cloud is caused by a series of events set into motion by the advancing
storm; first, cool air settles along the ground where precipitation has just fallen.
As the cool air is brought in, the warmer air is displaced, and rises above it,
because it is less dense. When the warmer air reaches the bottom of the storm cloud,
it begins to cool again, and the resulting condensation is a visible shelf cloud.
Next Topic: Sleet
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