Weather Alert in Colorado
Avalanche Watch issued February 16 at 5:16PM MST by NWS Denver CO
AREAS AFFECTED: Grand and Battlement Mesas; Gore and Elk Mountains/Central Mountain Valleys; Flat Tops
DESCRIPTION: AVABOU THE FOLLOWING MESSAGE IS TRANSMITTED AT THE REQUEST OF THE COLORADO AVALANCHE INFORMATION CENTER. AVALANCHE WATCH IN EFFECT FROM 9 AM WEDNESDAY TO 5 PM FRIDAY *WHAT Heavy snow and strong winds will result in HIGH (4 of 5) avalanche danger *WHERE The San Juan Mountains and the Park Range *WHEN Expect very dangerous avalanche conditions to begin Wednesday and last through Friday *IMPACTS Large and dangerous avalanches will be easy to trigger. Large avalanches will run naturally. *PRECAUTION/PREPAREDNESS ACTIONS Travel in backcountry avalanche terrain is not recommended from Wednesday through Friday. Avoid travel on and under slopes with a slope angle steeper than about 30 degrees. You can find more detailed information at colorado.gov/avalanche
INSTRUCTION: N/A
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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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