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Franklin's Forecast - Tornado
Tornadoes can appear any time of year, but are most common during the spring and summer months. More about Tornadoes Because tornadoes form and strike so quickly, RADAR images don't really help to forecast tornadoes far in advance. However, the velocity mode ...
fi.edu

Weather -- Powerful Storms
Thunderstorms form when warm air rises from Earth's surface and moves upwards quickly into the colder levels of the atmosphere. If conditions are right, tornadoes can form from this ... United States. This region's propensity for tornadoes has earned it the name Tornado Alley. Tornadoes form from thunderstorms, though not all thunderstorms generate tornadoes. An unstable column of warm air rising ...
learner.org

Tornadoes--Forces of Nature--Science, Maps, Photos, Video (National Geographic)
United States. Related to tornadoes, waterspouts are weak twisters that form over warm water. They sometimes move inland and become tornadoes ... thunderstorms. Photograph courtesy NOAA Tornadoes form when warm, humid air ... tornadoes than any other month, but April's twisters are usually more violent. Although they can occur at any time of the day or night, most tornadoes form ...
nationalgeographic.com

Forces of Nature--Natural Disaster Fast Facts (National Geographic)
United States. Tornadoes form when warm, humid air collides with cold, dry air. The most violent tornadoes come from supercells, large thunderstorms that have winds already in rotation. Most tornadoes ...
nationalgeographic.com More from this site

Monthly summary for September 1999
Sep 04: Dennis may hit North Carolina as hurricane - CNN Sep 04: Don't let tornadoes, hurricanes or earthquakes leave you in fiscal ruins - CNN Sep 04: Dennis threatens hurricane force ... its wake - CNN Sep 05: Tropical storm Dennis returns - BBC (World) Sep 06: Tropical storms form off Pacific, Gulf coasts of Mexico - CNN (Americas) Sep 06: Tropical Storm Greg strengthens, heads ...
www.cru.uea.ac.uk

Summer weather factsheet English
Tornadoes Usually form in hot, humid weather and often, but not always, in the afternoon or early evening. Thunderstorms that produce tornadoes are called tornadic thunderstorms. They ... one to two per cent of the tornadoes are F3. The tornadoes which struck on April 20, 1996 in Grey, Dufferin and Wellington counties were F3 tornadoes. The Barrie Tornado of May ...
www.on.ec.gc.ca

CPC - Outreach: NOAA Climate Press Releases
August For Nation 8/16/05 - Above-Average Warmth, Five Tropical Systems Form In July, Nation's Precipitation Near Average; Global Temperature Up 8/2/ ... The West 2004 12/30/04 - NOAA Reports Record Number Of Tornadoes In 2004 12/16/04 - NOAA Reports Wet, Warm Year For The ... Mississippi Valley, Early Snow In Alaska 10/7/04 - Record Number Of Tornadoes Reported In U.S. During September 10/6/04 - NOAA U.S ...
www.cpc.ncep.noaa.gov

EnviroZine - Frequently Asked Questions
Issue 42 April 16, 2004 What causes a tornado to form, how long does the average tornado last and how is it tracked? Issue 41 March ... January 15, 2004 Will climate change have an effect on storm systems such as thunderstorms, tornadoes, blizzards and hurricanes? Issue 38 December 4, 2003 Why are the salt trucks going out ...
www.ec.gc.ca

U.S. Global Change Research Information Office
Ironically, it may be this more readily-sensed form of air pollution that will help slow the global build-up of greenhouse gases. In ... . Many if not most responsible health or environmental warnings, from contaminated food to floods and tornadoes and global greenhouse warming, call for prudent action well before every conceivable doubt has been ...
gcrio.org

Greentimes JR Articles - Weather
Sometimes we even have dangerous weather such as hurricanes and tornadoes! We have weather here on planet earth because the air, water ... when it is just rising. Differences in temperatures cause wind to form. Wind is another major part of the weather. The wind ... is the water that falls from the clouds. Rain is a form of precipitation. Others forms of precipitation are snow, hail and sleet. ...
greenscreen.org