Weather Alert in Idaho
Flood Watch issued August 26 at 1:23PM MDT until August 28 at 12:00AM MDT by NWS Pocatello ID
AREAS AFFECTED: Shoshone/Lava Beds; Arco/Mud Lake Desert; Upper Snake River Plain; Lower Snake River Plain; Eastern Magic Valley; Southern Hills/Albion Mountains; Raft River Region; Marsh and Arbon Highlands; Franklin/Eastern Oneida Region; Bear River Range; Bear Lake Valley; Blackfoot Mountains; Caribou Range; Big Hole Mountains; Teton Valley; Centennial Mountains/Island Park; Beaverhead/Lemhi Highlands; Lost River Valleys; Lost River Range; Challis/Pahsimeroi Valleys; Frank Church Wilderness; Sun Valley Region; Big Lost Highlands/Copper Basin; Wood River Foothills
DESCRIPTION: A surge of deep monsoonal moisture will bring a prolonged period of rainfall across eastern Idaho which will result in widespread rainfall totals around 1 inch with locally higher amounts closer to 2 inches possible. This could result in areas of flooding within urban areas along with small creeks and streams. Additionally, there will be some potential for flash flooding, especially over recent burn scars. * WHAT...Flooding caused by excessive rainfall is possible. Flash flooding caused by excessive rainfall is also possible over area burn scars. * WHERE...Portions of central, eastern, south central, and southeast Idaho, including the following areas, in central Idaho, Big Lost Highlands/Copper Basin, Challis/Pahsimeroi Valleys, Frank Church Wilderness, Lost River Range, Lost River Valley, Sun Valley Region and Wood River Foothills. In eastern Idaho, Beaverhead - Lemhi Highlands, Big Hole Mountains, Centennial Mountains - Island Park and Teton Valley. In south central Idaho, Eastern Magic Valley and Shoshone/Lava Beds. In southeast Idaho, Arco/Mud Lake Desert, Bear Lake Valley, Bear River Range, Blackfoot Mountains, Caribou Range, Franklin/Eastern Oneida Region, Lower Snake River Plain, Marsh and Arbon Highlands, Raft River Region, Southern Hills/Albion Mountains and Upper Snake River Plain. * WHEN...Through Wednesday evening. * IMPACTS...Excessive runoff may result in flooding of rivers, creeks, streams, and other low-lying and flood-prone locations. Creeks and streams may rise out of their banks. In addition, flooding may occur in poor drainage and urban areas. * ADDITIONAL DETAILS... - http://www.weather.gov/safety/flood
INSTRUCTION: You should monitor later forecasts and be alert for possible Flood Warnings. Those living in areas prone to flooding should be prepared to take action should flooding develop.
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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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