Weather Alert in Idaho
Hydrologic Outlook issued August 25 at 12:46AM 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 through midweek. High atmospheric moisture will allow for isolated thunderstorms producing 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 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
Weather Topic: What is Snow?
Home - Education - Precipitation - Snow
Next Topic: Stratocumulus Clouds
Snow is precipitation taking the form of ice crystals. Each ice crystal, or snowflake,
has unique characteristics, but all of them grow in a hexagonal structure.
Snowfall can last for sustained periods of time and result in significant buildup
of snow on the ground.
On the earth's surface, snow starts out light and powdery, but as it begins to melt
it tends to become more granular, producing small bits of ice which have the consistency of
sand. After several cycles of melting and freezing, snow can become very dense
and ice-like, commonly known as snow pack.
Next Topic: Stratocumulus Clouds
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