Weather Alert in Alaska
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 Sleet?
Home - Education - Precipitation - Sleet
Next Topic: Snow
Sleet is a form of precipitation in which small ice pellets are the primary
components. These ice pellets are smaller and more translucent than hailstones,
and harder than graupel. Sleet is caused by specific atmospheric conditions and
therefore typically doesn't last for extended periods of time.
The condition which leads to sleet formation requires a warmer body of air to be
wedged in between two sub-freezing bodies of air. When snow falls through a warmer
layer of air it melts, and as it falls through the next sub-freezing body of air
it freezes again, forming ice pellets known as sleet. In some cases, water
droplets don't have time to freeze before reaching the surface and the result is
freezing rain.
Next Topic: Snow
Weather Topic: What are Stratocumulus Clouds?
Home - Education - Cloud Types - Stratocumulus Clouds
Next Topic: Stratus Clouds
Stratocumulus clouds are similar to altocumulus clouds in their
fluffy appearance, but have a slightly darker shade due to their additional mass.
A good way to distinguish the two cloud types is to hold your hand out and measure
the size of an individual cloud; if it is the size of your thumb it is generally
an altocumulus cloud, if it is the size of your hand it is generally a
stratocumulus cloud.
It is uncommon for stratocumulus clouds to produce precipitation, but if they do
it is usually a light rain or snow.
Next Topic: Stratus Clouds
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