Weather Alert in South Dakota
Severe Thunderstorm Warning issued July 5 at 8:15PM MDT until July 5 at 8:45PM MDT by NWS Rapid City SD
AREAS AFFECTED: Butte, SD; Lawrence, SD; Meade, SD
DESCRIPTION: At 815 PM MDT, severe thunderstorms were located along a line extending from 3 miles southeast of Newell Lake to 5 miles east of Bear Butte State Park to 2 miles east of Spearfish Canyon, moving southeast at 40 mph. HAZARD...60 mph wind gusts. SOURCE...Radar indicated. IMPACT...Expect damage to roofs, siding, and trees. Locations impacted include... Spearfish, Sturgis, Belle Fourche, Lead, Summerset, Deadwood, Whitewood, Newell, Nisland, Piedmont, Saint Onge, Vale, Central City, Fruitdale, Galena, Tilford, Bear Butte State Park, Owl Butte, Fort Meade, and Belle Fourche Reservoir. This includes Interstate 90 in South Dakota between Mile Markers 6 and 49.
INSTRUCTION: For your protection move to an interior room on the lowest floor of a building. Torrential rainfall is occurring with these storms, and may lead to flash flooding. Do not drive your vehicle through flooded roadways.
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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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