Weather Alert in Idaho
Hydrologic Outlook issued August 24 at 3:20PM MDT by NWS Boise ID
AREAS AFFECTED: Ada, ID; Adams, ID; Boise, ID; Camas, ID; Canyon, ID; Elmore, ID; Gem, ID; Gooding, ID; Jerome, ID; Owyhee, ID; Payette, ID; Twin Falls, ID; Valley, ID; Washington, ID; Baker, OR; Harney, OR; Malheur, OR
DESCRIPTION: ESFBOI Monsoon moisture will bring a threat of showers and thunderstorms to the region. High atmospheric moisture will allow for isolated heavy rain accumulations, leading to an increased threat of flash flooding. Tuesday and Wednesday currently have the highest chance for locally heavy rains, especially in southeast Oregon, near the ID-NV border, and high terrain in southwest Idaho. Conditions dry out after Thursday. Burn scars are the highest risk for flash flooding. The Wapiti Fire burn scar near Grandjean, ID, the Durkee Fire burn scar near Ironside, OR, and the Lava Fire burn scar near Cascade, ID are of particular concern for flash flooding.
INSTRUCTION: N/A
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Weather Topic: What is Precipitation?
Home - Education - Precipitation - Precipitation
Next Topic: Rain
Precipitation can refer to many different forms of water that
may fall from clouds. Precipitation occurs after a cloud has become saturated to
the point where its water particles are more dense than the air below the cloud.
In most cases, precipitation will reach the ground, but it is not uncommon for
precipitation to evaporate before it reaches the earth's surface.
When precipitation evaporates before it contacts the ground it is called Virga.
Graupel, hail, sleet, rain, drizzle, and snow are forms of precipitation, but fog
and mist are not considered precipitation because the water vapor which
constitutes them isn't dense enough to fall to the ground.
Next Topic: Rain
Weather Topic: What are Shelf Clouds?
Home - Education - Cloud Types - Shelf Clouds
Next Topic: Sleet
A shelf cloud is similar to a wall cloud, but forms at the front
of a storm cloud, instead of at the rear, where wall clouds form.
A shelf cloud is caused by a series of events set into motion by the advancing
storm; first, cool air settles along the ground where precipitation has just fallen.
As the cool air is brought in, the warmer air is displaced, and rises above it,
because it is less dense. When the warmer air reaches the bottom of the storm cloud,
it begins to cool again, and the resulting condensation is a visible shelf cloud.
Next Topic: Sleet
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