Weather Alert in South Dakota
Red Flag Warning issued February 26 at 10:04PM MST until February 27 at 6:00PM MST by NWS Rapid City SD
AREAS AFFECTED: 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, 322, 326, 333, 334, AND 335... .Very dry air will affect parts of northeastern Wyoming as well as far southwestern into south-central South Dakota Friday afternoon. 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. The combination of low humidity values and gusty winds will create critical fire weather conditions on Friday for these areas. 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 1 PM to 7 PM CST Friday. The Fire Weather Watch is no longer in effect. * AFFECTED AREA...Fire Weather Zone 335 Tripp County. * WINDS...Northwest 20 to 30 mph with gusts up to 40 mph. * RELATIVE HUMIDITY...As low as 15 to 20 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 Cirrus Clouds?
Home - Education - Cloud Types - Cirrus Clouds
Next Topic: Condensation
Cirrus clouds are high-level clouds that occur above 20,000 feet
and are composed mainly of ice crystals.
They are thin and wispy in appearance.
What do they indicate?
They are often the first sign of an approaching storm.
Next Topic: Condensation
Weather Topic: What are Contrails?
Home - Education - Cloud Types - Contrails
Next Topic: Cumulonimbus Clouds
A contrail is an artificial cloud, created by the passing of an
aircraft.
Contrails form because water vapor in the exhaust of aircraft engines is suspended
in the air under certain temperatures and humidity conditions. These contrails
are called exhaust contrails.
Another type of contrail can form due to a temporary reduction in air pressure
moving over the plane's surface, causing condensation.
These are called aerodynamic contrails.
When you can see your breath on a cold day, it is also because of condensation.
The reason contrails last longer than the condensation from your breath is
because the water in contrails freezes into ice particles.
Next Topic: Cumulonimbus Clouds
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