Weather Alert in Montana

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Current Alerts for Big Sky, MT: High Wind Warning

Special Weather Statement issued February 25 at 3:30AM MST by NWS Great Falls MT

AREAS AFFECTED: Big Belt, Bridger and Castle Mountains; Meagher County Valleys; Elkhorn and Boulder Mountains; Canyon Ferry Area; Missouri Headwaters; Gallatin Valley; Northwest Beaverhead County; Beaverhead and Western Madison below 6000ft

DESCRIPTION: At 330 AM MST...radar showed showers increasing in coverage across southwest Montana in association with an advancing frontal system. Temperatures are near freezing below 5000 ft where precipitation is mixed but cooling this morning will result in a transition to mostly snow as these showers track across southwest Montana through 7 AM MST. Snow showers will affect areas as far south as Dillon and along the I-90 corridor to Bozeman and Bozeman pass by 6 AM MST. Snow accumulation at elevations below 5000 ft will be minimal, but travelers should expect changing visibility and road conditions in areas affected by these showers. In addition, locally gusty winds near these showers may produce additional visibility reduction.

INSTRUCTION: N/A

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Weather Topic: What is Sleet?

Home - Education - Precipitation - Sleet

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

Weather Topic: What are Stratocumulus Clouds?

Home - Education - Cloud Types - Stratocumulus Clouds

Stratocumulus Clouds Next Topic: Stratus Clouds

Stratocumulus clouds are similar to altocumulus clouds in their fluffy appearance, but have a slightly darker shade due to their additional mass.

A good way to distinguish the two cloud types is to hold your hand out and measure the size of an individual cloud; if it is the size of your thumb it is generally an altocumulus cloud, if it is the size of your hand it is generally a stratocumulus cloud.

It is uncommon for stratocumulus clouds to produce precipitation, but if they do it is usually a light rain or snow.

Next Topic: Stratus Clouds

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