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: Southern Black Hills
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. The National Weather Service in Rapid City has issued a Red Flag Warning for gusty winds and low relative humidity, which is in effect until 6 PM MST this evening. * AFFECTED AREA...Fire Weather Zone 321 Southern Black Hills. * WINDS...Northwest 10 to 15 mph with gusts up to 25 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 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 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
Weather Topic: What are Cumulus Clouds?
Home - Education - Cloud Types - Cumulus Clouds
Next Topic: Drizzle
Cumulus clouds are fluffy and textured with rounded tops, and
may have flat bottoms. The border of a cumulus cloud
is clearly defined, and can have the appearance of cotton or cauliflower.
Cumulus clouds form at low altitudes (rarely above 2 km) but can grow very tall,
becoming cumulus congestus and possibly the even taller cumulonimbus clouds.
When cumulus clouds become taller, they have a greater chance of producing precipitation.
Next Topic: Drizzle
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