Severe Weather
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Severe Weather
Severe weather is any destructive weather phenomenon. The term is usually used to refer to severe thunderstorms and related phenomena, such as tornados, hail, and downbursts. Severe weather can also refer to snowstorms, ice storms, blizzards, flooding, hurricanes, and high winds.// TerminologyIn its broadest sense, the term "severe weather" is defined as any aspect of the weather which can "pose a threat to life and property". This can include phenomena such as tropical cyclones, ice storms, wind storms, blizzards, heat waves, and severe thunderstorms. However, as stated above, common usage of the word refers to severe thunderstorms, with three-quarter inch size hail, damaging winds in excess of 50 knots (58 miles per hour), and/or tornadoes. Severe Summer WeatherThis section includes a list of references or external links, but its sources remain unclear because it has insufficient inline citations.You can improve this article by introducing more precise citations where appropriate.Severe summer weather can be put into three different categories. These are approaching severe, severe, and significant severe. Approaching severe is defined as hail between 1/2 and 3/4 inch diameter or winds between 50 and 58 M.P.H. (50 knots). In the United States, such storms will usually warrant a Significant Weather Advisory. Severe is defined as hail 3/4 inch diameter or larger, winds 58 M.P.H. or stronger, or a tornado. Significant severe is defined as hail 2 inch in diameter or larger, winds 75 M.P.H. (65 knots) or stronger, or a tornado of strength EF2 or stronger. Both severe and significant severe events will warrant a severe thunderstorm warning from the National Weather Service or Environment Canada if the event is in the United States or Canada, respectively. If a tornado is occurring or if it is likely one will occur, the severe thunderstorm warning will be superseded by a tornado warning, which warns for other elements of a severe thunderstorm as well as the tornado itself. InitiationOrganized severe weather tends to occur in the same conditions which cause ordinary thunderstorms: atmospheric moisture, lift, and instability. Clouds are little more than condensed water vapor, and thus high atmospheric moisture, signified by a high dew point, aids the development of the clouds which become thunderstorms. Instability is defined the tendency for a parcel of air near the earth's surface to keep rising when forced upwards by a source of lift. When sufficient air starts to rise due to this instability, this air also cools and expands, and the moisture contained in the parcel condenses creating the cloud itself. Sources of lift include geographic features, such as mountains, and air mass boundaries such as cold fronts, warm fronts, and dry lines.A wide variety of conditions can cause severe weather. While in general, the criteria above will produce generic thunderstorms, any of several factors can turn those thunderstorms severe; for instance, a pool of cold air aloft can aid in the development of large hail from seemingly innoccuous thunderstorms. However, the most severe hail and tornadoes are produced by supercell thunderstorms, and the worst downbursts and derechos (straight-line winds) are produced by bow echoes. Both of these types of storms tend to form in environments high in wind shear. HazardsBy definition, all types of severe weather pose some risk to life and property. OutbreaksA severe weather outbreak is typically considered to be 10 or more tornadoes, some of which will most likely be long tracked and violent, and many large hail and damaging wind reports. However, there is much dependence on the geographic size of the outbreak (does it cover a small section of a state or is it spread out over several states?).
Climate extremes, including devastating floods, severe and persistent droughts, snowstorms and heat waves were recorded in many countries, according to the World Meteorological Organisation (WMO).A new U.Dehydration is the loss of water in our body, sometimes severe enough to cause shock since human body is composed of seventy five percent water.Whatever happened to road gritting? Council needs to act or be ready for floods of compensation claims.My relatives in New England are fighting their way out from under a giant ice storm. study on climate change reveals that 2008 was one of the warmest years since 1850 when scientists started to keep weather records. Here in Las Vegas it's been snowing all week, several weeks earlier than our usual one-day-a-year photo op of snow and icicles sparkling one of our palm-bedecked golf courses before melting away by afternoon.Severe winter weather was creating Christmas week travel headaches across the country Monday, canceling flights and closing major highways.., Seattle and Vancouver, British Columbia, due to severe winter weather hitting the region this afternoon.Retailers had an exceptionally slow holiday season, as consumers chose to save their money rather than spend on presents.Roads and pavements has it taken over, causing accidents.And it’s been quite hard
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Severe Weather
Official government site for the prediction of thunderstorms and severe weather in the U.S.
Storm Prediction Center
Severe weather is any destructive weather phenomenon. The term is usually used to refer to severe thunderstorms and related phenomena, such as tornados, hail, and downbursts ...
Severe weather - Wikipedia, the free encyclopedia
The Weather Channel | Severe weather safety, alerts, and resources. Severe weather awareness from WeatherREADY. Develop a Family Preparedness Plan.
Severe Weather Safety and Awareness - WeatherREADY
This is a World Meteorological Organization (WMO) project to provide a single and centralized source for the media to access official warnings and information issued by National ...
Severe Weather Information Centre
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