Weather Alert in Alaska

Recent Locations: Holcomb, MS   Cordova, AK   Walnut Grove, MS  

Hydrologic Outlook issued August 24 at 12:43PM AKDT by NWS Fairbanks AK

AREAS AFFECTED: Howard Pass and the Delong Mountains; Central Brooks Range; Noatak Valley; Lower Kobuk Valley; Northern Seward Peninsula; Southern Seward Peninsula Coast; Interior Seward Peninsula; Eastern Norton Sound and Nulato Hills; Lower Yukon River; Lower Koyukuk Valley; Middle Yukon Valley; Lower Yukon and Innoko Valleys; Upper Koyukuk Valley; Dalton Highway Summits; Central Interior

DESCRIPTION: ESFAFG Moderate to heavy rainfall is expected to continue through early next week with rainfall totals of 1 to 3 inches in many areas of the middle Kuskokwim, middle and lower Yukon, Koyukuk, and Kobuk River basins. Locally higher totals in excess of 4 inches are possible at higher elevations, particularly within the Nulato Hills and portions of the Brooks Range. Expect increasing river levels on tributaries to these basins starting this weekend and rising water levels on the main stems starting early next week.

INSTRUCTION: N/A

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Weather Topic: What is Precipitation?

Home - Education - Precipitation - 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?

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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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