Weather Alert in Idaho
Special Weather Statement issued September 10 at 8:01PM PDT by NWS Spokane WA
AREAS AFFECTED: Lewis and Southern Nez Perce Counties
DESCRIPTION: At 801 PM PDT, Doppler radar was tracking strong thunderstorms along a line extending from 12 miles northeast of Headquarters to 8 miles northwest of White Bird. Movement was west at 20 mph. HAZARD...Winds in excess of 30 mph and pea size hail. SOURCE...Radar indicated. IMPACT...Gusty winds could knock down tree limbs and blow around unsecured objects. Minor hail damage to outdoor objects is possible. Locations impacted include... Kamiah, Craigmont, Nezperce, Winchester, Reubens, and Mohler. This includes the following highways... U.S. Highway 95 in Idaho between mile markers 268 and 281. U.S. Highway 12 in Idaho between mile markers 52 and 54, and between mile markers 59 and 67.
INSTRUCTION: If outdoors, consider seeking shelter inside a building.
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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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