Weather Alert in Nebraska
Special Weather Statement issued February 7 at 6:01PM CST by NWS Hastings NE
AREAS AFFECTED: Valley; Greeley; Nance; Sherman; Howard; Merrick; Polk; Buffalo; Hall; Hamilton
DESCRIPTION: Continued well-above normal temperatures (especially through Monday) will cause increasing ice melt and ice movement along the Platte, North Loup, Middle Loup, South Loup and Loup Rivers in central and south central Nebraska. This could result in the possible formation of localized ice jams. Although not a certainty, should any ice jams happen to develop, water levels could fluctuate as much as 1 to 3 feet in a very short time, causing flooding with little, if any notice. If any ice jam flooding is observed over the next few days along the Platte or Loup River systems in central and south central Nebraska, please report it immediately to the National Weather Service in Hastings.
INSTRUCTION: N/A
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Weather Topic: What is Precipitation?
Home - Education - 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?
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
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