Weather Alert in Nebraska
Special Weather Statement issued February 8 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 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. This is especially true for known ice jam prone locations. 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, Nebraska.
INSTRUCTION: N/A
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Weather Topic: What is Rain?
Home - Education - Precipitation - Rain
Next Topic: Shelf Clouds
Precipitation in the form of water droplets is called rain.
Rain generally has a tendency to fall with less intensity over a greater period
of time, and when rainfall is more severe it is usually less sustained.
Rain is the most common form of precipitation and happens with greater frequency
depending on the season and regional influences. Cities have been shown to have
an observable effect on rainfall, due to an effect called the urban heat island.
Compared to upwind, monthly rainfall between twenty and forty miles downwind of
cities is 30% greater.
Next Topic: Shelf Clouds
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
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