Weather Alert in Nebraska
Dense Fog Advisory issued September 2 at 1:20AM CDT until September 2 at 10:00AM CDT by NWS Hastings NE
AREAS AFFECTED: Valley; Greeley; Nance; Sherman; Howard; Merrick; Polk; Dawson; York
DESCRIPTION: * WHAT...Visibility one-quarter mile or less in dense fog. * WHERE...Greeley, Howard, Merrick, Nance, Sherman, Valley, Polk, York, and Dawson Counties. * WHEN...Until 10 AM CDT this morning. * IMPACTS...Low visibility could make driving conditions hazardous, including for the Tuesday morning commute. * ADDITIONAL DETAILS...Although at least light fog is likely this morning across much of the Advisory area, the development of truly dense fog, reducing visibility to 1/4 mile or less, will likely be more hit-and-miss in nature...impacting some areas more than others. This will result in widely varying visibilities, including over short distances. Although not all areas will see truly dense fog, enough potential exists for dense fog within enough of the area to justify this Advisory.
INSTRUCTION: If driving, slow down, use your headlights, and leave plenty of distance ahead of you.
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Weather Topic: What are Mammatus Clouds?
Home - Education - Cloud Types - Mammatus Clouds
Next Topic: Nimbostratus Clouds
A mammatus cloud is a cloud with a unique feature which resembles
a web of pouches hanging along the base of the cloud.
In the United States, mammatus clouds tend to form in the warmer months, commonly
in the Midwest and eastern regions.
While they usually form at the bottom of a cumulonimbis cloud, they can also form
under altostratus, altocumulus, stratocumulus, and cirrus clouds. Mammatus clouds
warn that severe weather is close.
Next Topic: Nimbostratus Clouds
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
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