Weather Alert in Alaska
Hydrologic Outlook issued August 25 at 12:45PM AKDT by NWS Fairbanks AK
AREAS AFFECTED: White Mountains and High Terrain South of the Yukon River; Upper Chena River Valley; Tanana Flats; Eielson AFB and Salcha; Goldstream Valley and Nenana Hills; Chatanika River Valley; Two Rivers; Fairbanks Metro Area; Nenana
DESCRIPTION: ESFAFG Moderate to heavy rainfall of 1" to 3" fell across portions of the Central Interior Sunday and Monday. While most of the heavier precipitation will shift northwest of the area by Tuesday, some scattered showers will remain possible, especially across the higher terrain. Runoff from this recent event will result in rises of the Chena River as well as small streams that feed into the river. The Chena River at Fairbanks is expected to crest in downtown Fairbanks early Wednesday morning just below minor flood stage.
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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