Monongalia County

Office of Emergency Management

 

Weather Info

 

 

 


 

 

   

Weather Terms

WARNING ... A product issued by NWS local offices indicating that a particular weather hazard is either imminent or occurring.  A warning indicates the need to take action to protect life and property.  Typical warnings include: Tornado Warning, Severe Thunderstorm Warning, Flash Flood/Flood Warning, Excessive Heat Warning.

WATCH ... A NWS product indicating that conditions are favorable for the development of a particular severe weather event.  A watch is normal issued for several hours and indicates a need for planning, preparation, and an increased awareness of changing weather conditions.  Typical watches include: Tornado Watch, Severe Thunderstorm Watch, Flash Flood/Flood Watch.

DOWNBURST ... An exceptionally energetic downdraft that exits the base of a thunderstorm and spreads out at the earth's surface as strong and gusty horizontal winds that may cause property damage.  Downbursts are much more common than you think and more likely than tornadoes in West Virginia.

FLASH FLOOD ... A flood that rises and falls quite rapidly.  Flash floods occur as the result of intense rainfall over a relatively small area in a short period of time.

FLOOD ... The condition that occurs when water overflows the natural or artificial confines of a stream or body of water, or accumulates by drainage over low lying areas. 

FUNNEL CLOUD ... Violently rotating column of air, but is not in contact with the ground.  A tornado passes the funnel cloud stage during its development and dissipation.

GUST FRONT ... The leading edge of a mass of cool, gusty air that flows from the base of a thunderstorm [downburst] and spreads along the ground in advance of a thunderstorm.

LIGHTNING ... Generally, any and all of the various forms of electrical discharge produced by thunderstorms.

SEVERE THUNDERSTORMS ... A thunderstorm producing a tornado, damaging winds of 58 mhp or greater, and/or hail 3/4 of an inch in diameter or larger.

SQUALL LINES ... Any line or narrow band of thunderstorms.  These lines may be of considerable length, extending across multiple states.

STRAIGHT LINE WINDS ... Typically used to describe thunderstorm wind damage that exhibits little rotational patterns to differentiate from the winds in a tornado that produce damage that exhibits rotational characteristics.  Damage after a tornado could also appear to be straight line depending on speed of movement, size and strength.  Straight line winds are most often found with a gust front, originating from a downburst.

THUNDERSTORM ... In general, a local storm produced by a cumulonimbus cloud, and always accompanied by lightning, thunder, gusty winds, possible heavy rain and sometimes hail.

TORNADO ... Violently rotating column of air in contact with the ground, descending from the base of a severe thunderstorm.  They are usually funnel-shaped, with a narrow end nearest the ground.  In West Virginia, most tornadoes are obscured by hills, trees and rain until they are upon you.  One rule of thumb used by spotters is, if the visible funnel extends more than halfway from the cloud to the ground, consider it a tornado ... you may not see the visible funnel near the ground if it is weak or disorganized. 

 

Links:

Morgantown Municipal-Hart, West Virginia (26507) Conditions & Forecast : Weather Underground

7-Day Forecast for Latitude 39.61N and Longitude -79.96W

Local Weather Forecast for Morgantown, WV (26505) - weather.com

NWS radar image from Pittsburgh, PA

West Virginia Data

Advanced Hydrologic Prediction Service: Pittsburgh

 

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Last updated: 01/30/08.