Weather Alert in South Dakota
Red Flag Warning issued February 27 at 3:38PM MST until February 27 at 6:00PM MST by NWS Rapid City SD
AREAS AFFECTED: Bennett County Area; Mellette and Todd Counties; Tripp County
DESCRIPTION: ...RED FLAG WARNING IN EFFECT FROM NOON MST/100 PM CST TO 600 PM MST/700 PM CST FRIDAY FOR GUSTY WINDS AND LOW RELATIVE HUMIDITY FOR FIRE WEATHER ZONES 315, 317, 321, 322, 326, 333, 334, AND 335... .Very dry air is over parts of northeastern Wyoming as well as far southwestern into south-central South Dakota. Minimum relative humidities will drop to 15 to 20 percent as northwest winds blow at 10 to 25 mph with gusts from 25 to 40 mph, strongest over south-central South Dakota. Antecedent D1 to D2 drought conditions will exacerbate the fire potential. * AFFECTED AREA...Fire Weather Zones 333 Bennett County Area, 334 Mellette and Todd Counties and 335 Tripp County. * WINDS...Northwest 10 to 20 mph with gusts up to 30 mph. * RELATIVE HUMIDITY...As low as 18 percent. * IMPACTS...The combination of gusty winds and low relative humidity would 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 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
Weather Topic: What is Snow?
Home - Education - Precipitation - Snow
Next Topic: Stratocumulus Clouds
Snow is precipitation taking the form of ice crystals. Each ice crystal, or snowflake,
has unique characteristics, but all of them grow in a hexagonal structure.
Snowfall can last for sustained periods of time and result in significant buildup
of snow on the ground.
On the earth's surface, snow starts out light and powdery, but as it begins to melt
it tends to become more granular, producing small bits of ice which have the consistency of
sand. After several cycles of melting and freezing, snow can become very dense
and ice-like, commonly known as snow pack.
Next Topic: Stratocumulus Clouds
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