Weather Alert in Virginia
Flood Advisory issued May 12 at 8:32PM EDT until May 13 at 2:30AM EDT by NWS Blacksburg VA
AREAS AFFECTED: Floyd, VA; Franklin, VA; Henry, VA; Montgomery, VA; Patrick, VA; Roanoke, VA; City of Roanoke, VA; City of Salem, VA
DESCRIPTION: * WHAT...Flooding caused by excessive rainfall is expected. * WHERE...Portions of southwest, Virginia, including the following counties and independent cities, Henry, Floyd, Montgomery, Patrick, City of Roanoke, City of Salem, Franklin and Roanoke. * WHEN...Until 230 AM EDT. * IMPACTS...Minor flooding in low-lying and poor drainage areas. Overflowing poor drainage areas. * ADDITIONAL DETAILS... - At 830 PM EDT, Doppler radar and automated rain gauges indicated heavy rain due to thunderstorms. Minor flooding is ongoing or expected to begin shortly in the advisory area. Up to 3 inches of rain have fallen. - This includes the following streams and drainages... Back Creek, Beaverdam Creek, Anglin Branch and Beaver Creek. - Some locations that will experience flooding include... Roanoke... Salem... Christiansburg... Vinton... Floyd... Boones Mill... Copper Hill... - http://www.weather.gov/safety/flood
INSTRUCTION: Turn around, don't drown when encountering flooded roads. Most flood deaths occur in vehicles. Be especially cautious at night when it is harder to recognize the dangers of flooding. When it is safe to do so, please send your reports of flooding, including mudslides or flooded roads, to the National Weather Service by calling toll free at 1...8 6 6...2 1 5...4 3 2 4. Reports and pictures can also be shared on the National Weather Service Blacksburg Facebook page and on Twitter.
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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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