Weather Alert in Idaho

Recent Locations: Spalding, NE Washington, VT Dietrich, ID

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 Wall Clouds?

Home - Education - Cloud Types - Wall Clouds

Wall Clouds Next Topic: Altocumulus Clouds

A wall cloud forms underneath the base of a cumulonimbus cloud, and can be a hotbed for deadly tornadoes.

Wall clouds are formed by air flowing into the cumulonimbus clouds, which can result in the wall cloud descending from the base of the cumulonimbus cloud, or rising fractus clouds which join to the base of the storm cloud as the wall cloud takes shape.

Wall clouds can be very large, and in the Northern Hemisphere they generally form at the southern edge of cumulonimbus clouds.

Next Topic: Altocumulus Clouds

Weather Topic: What are Altostratus Clouds?

Home - Education - Cloud Types - Altostratus Clouds

Next Topic: Cirrocumulus Clouds

Altostratus clouds form at mid to high-level altitudes (between 2 and 7 km) and are created by a warm, stable air mass which causes water vapor to condense as it rise through the atmosphere. Usually altostratus clouds are featureless sheets characterized by a uniform color.

In some cases, wind punching through the cloud formation may give it a waved appearance, called altostratus undulatus. Altostratus clouds are commonly seen with other cloud formations accompanying them.

Next Topic: Cirrocumulus Clouds