Weather Alerts for Montana
1. Lake Wind Advisory for: Central and Southeast Phillips; Central and Southern Valley; Petroleum; Garfield; McCone
2. Winter Storm Warning for: Little Belt and Highwood Mountains; Gallatin and Madison County Mountains and Centennial Mountains
3. Winter Storm Watch for: Absaroka/Beartooth Mountains; Crazy Mountains
4. Winter Storm Watch for: Bighorn Canyon
5. Winter Storm Watch for: Bitterroot/Sapphire Mountains; Butte/Blackfoot Region; Potomac/Seeley Lake Region
6. Winter Storm Watch for: Custer; Fallon; Powder River; Carter
7. Winter Storm Watch for: Dawson; Prairie; Wibaux
8. Winter Storm Watch for: Northern Big Horn; Southwestern Yellowstone
9. Winter Storm Watch for: Pryor/Northern Bighorn Mountains; Northeast Bighorn Mountains
10. Winter Storm Watch for: Southern Big Horn
11. Winter Storm Watch for: Southern Rosebud
12. Winter Storm Watch for: Treasure; Northern Rosebud; Northeastern Yellowstone
13. Winter Weather Advisory for: Big Belt, Bridger and Castle Mountains
14. Winter Weather Advisory for: Cascade County below 5000ft; Judith Basin County and Judith Gap; Fergus County below 4500ft; Snowy and Judith Mountains
15. Winter Weather Advisory for: East Glacier Park Region
16. Winter Weather Advisory for: Southern Big Horn
17. Winter Weather Advisory for: Southern Rocky Mountain Front; Upper Blackfoot and MacDonald Pass; Elkhorn and Boulder Mountains; Northwest Beaverhead County
18. Winter Weather Advisory for: Southern Rosebud
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North America Water Vapor (Moisture)
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Weather Topic: What is Rain?
Home - Education - Precipitation - Rain
Next Topic: Shelf Clouds
Precipitation in the form of water droplets is called rain.
Rain generally has a tendency to fall with less intensity over a greater period
of time, and when rainfall is more severe it is usually less sustained.
Rain is the most common form of precipitation and happens with greater frequency
depending on the season and regional influences. Cities have been shown to have
an observable effect on rainfall, due to an effect called the urban heat island.
Compared to upwind, monthly rainfall between twenty and forty miles downwind of
cities is 30% greater.
Next Topic: Shelf Clouds
Weather Topic: What is Sleet?
Home - Education - Precipitation - Sleet
Next Topic: Snow
Sleet is a form of precipitation in which small ice pellets are the primary
components. These ice pellets are smaller and more translucent than hailstones,
and harder than graupel. Sleet is caused by specific atmospheric conditions and
therefore typically doesn't last for extended periods of time.
The condition which leads to sleet formation requires a warmer body of air to be
wedged in between two sub-freezing bodies of air. When snow falls through a warmer
layer of air it melts, and as it falls through the next sub-freezing body of air
it freezes again, forming ice pellets known as sleet. In some cases, water
droplets don't have time to freeze before reaching the surface and the result is
freezing rain.
Next Topic: Snow
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