Weather Alert in Idaho
Winter Weather Advisory issued February 17 at 1:21PM PST until February 18 at 10:00AM PST by NWS Spokane WA
AREAS AFFECTED: Lewiston Area; Lower Garfield and Asotin Counties
DESCRIPTION: * WHAT...Snow expected. Snow accumulations between a few tenths of an inch to 2 inches. Local amounts around 3 inches. Less than an inch in the lower river valleys and Lewiston-Clarkston. * WHERE...Peck, Gifford, Lapwai, Culdesac, Clarkston, Alpowa Summit, Lewiston Grade, Lewiston, and Pomeroy. * WHEN...From 10 PM this evening to 10 AM PST Wednesday. * IMPACTS...Plan for winter travel conditions during the Wednesday morning commute. * ADDITIONAL DETAILS...Small scale bands of moderate to heavy snow will lead to large variability in snow amounts over short distances.
INSTRUCTION: Slow down and use caution while traveling. In Idaho, for the latest road information in Idaho, call 5 1 1. In Washington, for the latest travel information in Washington, go to https://wsdot.wa.gov/travel
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Weather Topic: What are Nimbostratus Clouds?
Home - Education - Cloud Types - Nimbostratus Clouds
Next Topic: Precipitation
A nimbostratus cloud is similar to a stratus cloud in its formless,
smooth appearance. However, a nimbostratus cloud is darker than a stratus cloud,
because it is thicker.
Unlike a stratus cloud, a nimbostratus cloud typically brings with it the threat
of moderate to heavy precipitation. In some cases, the precipitation may evaporate
before reaching the ground, a phenomenon known as virga.
Next Topic: Precipitation
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
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