Weather Alert in California
Winter Storm Warning issued February 16 at 10:53AM PST until February 18 at 12:00PM PST by NWS San Diego CA
AREAS AFFECTED: San Bernardino County Mountains; Riverside County Mountains
DESCRIPTION: * WHAT...Heavy snow expected. Through Tuesday morning, snowfall of 4 to 8 inches is expected from 5500 to 6000 feet, 8 to 16 inches from 6000 to 7000 feet, and locally 2 to 3 feet above 7500 feet. Southwest winds will gust to 45 to 55 mph. Snow levels will fall to 5000 to 5500 feet for late tonight into Tuesday. Another round of more widespread precipitation is expected for Tuesday night into Wednesday morning with additional snowfall of 3 to 8 inches from 5000 to 6000 feet, 8 to 16 inches from 6000 to 7000 feet, and 16 to 20 inches above 7000 feet. The snow level will fall to 3500 to 4500 feet for Wednesday afternoon into Thursday. Southwest winds for Tuesday night through Wednesday afternoon will gust to 55 to 75 mph on the desert slopes of the mountains. * WHERE...Riverside County Mountains and San Bernardino County Mountains. * WHEN...Until noon PST Wednesday. * IMPACTS...Travel could be very difficult to impossible. The hazardous conditions could impact the Monday evening and Tuesday morning commutes. Very strong winds could cause extensive tree damage. * ADDITIONAL DETAILS...Wednesday night into Thursday up to an inch of snow could accumulate below 5000 ft, with 2-4 inches of additional snowfall above 5000 ft.
INSTRUCTION: If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1.
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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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