Weather Alert in Wyoming
Winter Storm Warning issued February 23 at 1:12AM MST until February 25 at 5:00PM MST by NWS Riverton WY
AREAS AFFECTED: Yellowstone National Park
DESCRIPTION: * WHAT...Heavy snow. Total snow accumulations 12 to 20 inches over the Pitchstone Plateau of southwest Yellowstone National Park. Locally higher amounts over 2 feet will be possible. 6 to 12 inches in central portions of Yellowstone, and between 1 and 4 inches in Lamar Valley and Mammoth. West wind 15 to 30 mph. * WHERE...Yellowstone National Park. * WHEN...From 5 AM Tuesday to 5 PM MST Wednesday. * IMPACTS...Backcountry travel could be very difficult.
INSTRUCTION: If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. For graphical depictions of the snowfall forecast, including the official NWS forecast, high end amounts, and low end amounts, visit https://weather.gov/riw/winter . For winter road conditions from the Wyoming Department of Transportation, visit https://wyoroad.info .
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Weather Topic: What are Fractus Clouds?
Home - Education - Cloud Types - Fractus Clouds
Next Topic: Freezing Rain
A fractus cloud (scud) is a fragmented, tattered cloud which has
likely been sheared off of another cloud. They are accessory clouds, meaning they
develop from parent clouds, and are named in a way which describes the original
cloud which contained them.
Fractus clouds which have originated from cumulus clouds are referred to as
cumulus fractus, while fractus clouds which have originated from stratus clouds
are referred to as stratus fractus. Under certain conditions a fractus cloud might
merge with another cloud, or develop into a cumulus cloud, but usually a
fractus cloud seen by itself will dissipate rapidly.
They are often observed on the leading and trailing edges of storm clouds,
and are a display of wind activity.
Next Topic: Freezing Rain
Weather Topic: What is Graupel?
Home - Education - Precipitation - Graupel
Next Topic: Hail
Graupel is a form of precipitation that is created by atmospheric conditions
which cause supercooled water droplets to contact snow crystals and freeze to
their surface.
Sometimes known as soft hail or snow pellets, graupel is delicate and easily
destroyed by touch. Whereas hail usually falls during severe weather, graupel
doesn't require such conditions to form, and can form in mild precipitation
similar to situations which produce snowfall.
Next Topic: Hail
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