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Topic: Severe thunderstorm

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severe thunderstorm warning

severe thunderstorm watch

supercell thunderstorm

Moderate Risk Of Severe Thunderstorms

Slight Risk Of Severe Thunderstorms

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	What is a Severe Thunderstorm Warning? (Site not responding. Last check: 2007-10-13)
		In order to understand what a severe thunderstorm warning is, it is helpful to know what a severe thunderstorm is. A severe thunderstorm is defined by the National Weather Service as having wind speeds of over 57 mph (98 km) and/or producing quarter-inch (.63 cm) size hail.
		These thunderstorms are usually part of a line of severe weather, and may be individual "supercells" or a long line of storms.
		A severe thunderstorm warning means that a severe thunderstorm is moving into a particular area.
	www.wisegeek.com /what-is-a-severe-thunderstorm-warning.htm (385 words)

	American Red Cross- Thunderstorms
		The typical thunderstorm is 15 miles in diameter and lasts an average of 20 to 30 minutes.
		When a severe thunderstorm WARNING is issued, review what actions to take under a tornado warning or a flash flood warning.
		For example, a severe thunderstorm watch means that a severe thunderstorm is expected in the next six hours or so within an area approximately 120 to 150 miles wide and 300 to 400 miles long (36,000 to 60,000 square miles).
	www.redcross.org /services/disaster/keepsafe/thunder.html (3492 words)

	Bureau - Graphical Severe Thunderstorm Warnings
		The Bureau of Meteorology issues Severe Thunderstorm Warnings whenever severe thunderstorms are occurring in an area or are expected to develop or move into the area during the ensuing few hours.
		Severe thunderstorms are likely to produce large hailstones and damaging winds in the warning area over the next several hours.
		Severe thunderstorms are forecast to affect Swansea, Lake Macquarie, Berowra, Brooklyn, Dee Why and Palm Beach by 12:45 PM and Belmont, Charlestown, Newcastle City, Wallsend, Woy Woy and Terrigal by 1:15 PM.
	www.bom.gov.au /catalogue/warnings/graphicalproducts.shtml (1887 words)

	Severe Thunderstorm
		A severe thunderstorm can be damaging and life threatening, death and injuries occasionally occur from strong winds.
		The national weather service defines a thunderstorm as "severe" when wind speed reach 58 mph stronger and/or hail is produced that is 3/4 inch in diameter or larger and/or a tornado is produced.
		a severe thunderstorm is indicated by radar, or reported by a reliable source.
	home.hiwaay.net /~nhfire/weathertips.htm (621 words)

	Thunderstorm
		Severe thunderstorms produce hail the size of a dime or larger and/or winds of 58 miles per hour or greater.
		Severe Thunderstorm Watch - Issued to alert the public that conditions are favorable for the development of severe thunderstorms in and close to the watch area.
		Severe Thunderstorm Warning - Issued by local NWS offices to warn the public that a severe thunderstorm has been sighted by storm spotters or has been indicated by radar.
	www.floridadisaster.org /bpr/EMTOOLS/Severe/thunderstorms.htm (528 words)

	Severe thunderstorm watch - Wikipedia, the free encyclopedia
		A severe thunderstorm watch (code: WS; sometimes referred to as "blue box" by meteorologists and storm chasers) is issued when weather conditions are favorable for the development of severe thunderstorms.
		If the thunderstorms are forecasted to be so severe that they may produce tornadoes, then a tornado watch (which also automatically implies a severe thunderstorm watch) is issued.
		This is rare with severe thunderstorm watches (since the tornado threat has to remain low enough to only warrant a severe thunderstorm watch); it is far more common with tornado watches.
	en.wikipedia.org /wiki/Severe_thunderstorm_watch (377 words)

	TECHNIQUES FOR ISSUING SEVERE THUNDERSTORM
		Generally the tornadoes that occur with multicell (or ordinary cell) thunderstorms are not as severe as the tornadoes that occur with the supercell thunderstorm.
		The familiar radar reflectivity signature commonly referred to as the "hook echo" is shown to be at the confluence of the thunderstorm updraft with the rear flank downdraft, and is the preferred region for strong tornado occurrence.
		Severe weather with LP supercells is limited to large hail and an occasional weak to moderate tornado.
	www.srh.noaa.gov /ssd/techmemo/sr185.htm (7861 words)

	Thunderstorm
		Prior to the development of a thunderstorm, the air near the surface is often warm and moist.
		In the Severe thunderstorm the updrafts and downdrafts are separate from one another, This allows the storm to last longer and severe weather may develop.
		Severe weather watches are issued when conditions are favorable for severe weather.
	cimss.ssec.wisc.edu /wxwise/class/thndstr.html (927 words)

	April 3, 2006 Severe Weather Event
		Several rounds of severe thunderstorms marched across central North Carolina on Monday, April 3rd (loop of KRAX radar imagery from 629 AM to 1158 PM EDT Tuesday, April 3, 2006).
		Several reports of hail were received around 500 PM EDT from locations 10 miles southeast of Fayetteville, near Cedar Creek and southwest of Stedman.
		The radar image below with the severe thunderstorm warnings highlighted in yellow is from 2353Z or 753 PM EDT at the height of the storminess across central North Carolina.
	www4.ncsu.edu /~nwsfo/storage/cases/20060403 (1807 words)

	Franklin's Forecast - Severe Thunderstorm (Site not responding. Last check: 2007-10-13)
		Severe thunderstorms feature heavy rain, intense lightning, strong gusty winds, hail, and, sometimes, tornadoes.
		Severe thunderstorms are especially dangerous because they can produce tornadoes.
		The shape and size of a severe thunderstorm may look the same as a less dangerous storm, but the intensity colors immediately indicate the severity.
	sln.fi.edu /weather/events/severe.html (86 words)

	WEAU \| Severe Thunderstorm Safety Check
		A SEVERE THUNDERSTORM WATCH means conditions are favorable for the development of severe thunderstorms and occasional tornadoes in and close to the watch area.
		A severe thunderstorm warning includes winds of 58 miles per hour or greater and/or hail at least 3/4 inch in diameter.
		If you are near or in the path of a severe thunderstorm, take immediate actions to protect life and property.
	www.weau.com /unclassified/1442667.html (393 words)

	Bureau of Meteorology: Severe Thunderstorm Warnings
		A Severe Thunderstorm Warning is issued when a severe thunderstorm is reported, or there is strong evidence of a severe thunderstorm, and it is expected to persist
		The exact location of severe thunderstorms can be hard to predict. The warnings are usually issued without much lead-time before the event. To try and issue warnings with a greater lead-time would lead to a flood of false alarms, thus rendering the service ineffective.
		Severe Thunderstorm Warnings are issued by Regional Offices of the Bureau of Meteorology in the capital city of the affected State/Territory, with the exception that warnings for the ACT are issued from Sydney.
	www.bom.gov.au /catalogue/warnings/WarningsInformation_SW_STSW.shtml (451 words)

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		Thunderstorms can produce winds as high as 150 miles per hour, strong enough to flip cars, vans, and trucks.
		Take time to learn about the severe thunderstorm risk in your area—including whether and how often severe thunderstorms are accompanied by tornadoes.
		If your community is at high risk for severe thunderstorms or if sections of the community are particularly vulnerable, and you live in those areas, it is suggested that you purchase and install lightning rods.
	training.fema.gov /EMIWeb/downloads/7-Thunderstorm-PM-Rev2.doc (693 words)

	Thunderstorm Index
		While thunderstorms and lightning can be found throughout the United States, they are most likely to occur in the central and southern states.
		A thunderstorm is formed from a combination of moisture, rapidly rising warm air and a force capable of lifting air such as a warm and cold front, a sea breeze or a mountain.
		Thus, it is possible for several thunderstorms to affect one location in the course of a few hours.
	www.ohsep.louisiana.gov /hlshazards/thunderstormlindex.htm (424 words)

	KFDI Severe Weather Information!
		Because of that potential, when we are warning on particularly large storms, many times we put in the warning the statement; "Severe thunderstorms can produce tornadoes with little or no advance warning." When you see that, pay particular attention to the storm and be ready to take cover.
		Severe weather warnings are issued to make people aware that severe weather is occurring or imminent.
		This severe weather season, when the potential is there for severe weather, make sure you are monitoring radio or television.
	images.radcity.net /5231/223200.txt (525 words)

	Severe Thunderstorms
		In a severe thunderstorm get inside a building and pay attention to a radio or TV for important weather information and updates.
		Conditions are favorable for the development of severe thunderstorms in and close to the watch area.
		All thunderstorms, whether or not they become severe, progress through a life cycle which may be divided into three main stages.
	www.theweatherclub1.homestead.com /SevereT.html (883 words)

	Thunderstorms (Site not responding. Last check: 2007-10-13)
		thunderstorm, thunderstorms, severe thunderstorms, lightning thunderstorm, tornados thunderstorms,wind and thunderstorms, storms, supercells, mesocyclones, atmospheric processes, convection
		A thunderstorm is an atmospheric process by which the atmosphere in a mesoscale region is stabilized through violent heat exchange between the lower and upper atmospheres.
		As heavy rain, lightning and strong winds begin to be produced as the process continues, it becomes a thunderstorm.
	www.stormwarn.com /rants/thunderstorm_genesis.html (451 words)

	Severe Thunderstorm Images of the Month Archives - 1998
		This image is of a storm that drifted by to the west of Magill, a suburb of Adelaide SA on 13th January 1998.
		Severe thunderstorms were reported across a large portion of north eastern New South Wales that day.
		Although this storm may have been associated with severe weather, severe electrical activity does not necessarily mean that the storm is severe or will produce severe weather.
	www.australiasevereweather.com /storm_news/arc1998.htm (935 words)

	New Jersey Office of Emergency Management
		A typical thunderstorm is 15 miles in diameter and lasts an average of 30 minutes - far smaller than a hurricane or a winter storm.
		Of the estimated 100,000 thunderstorms that occur each year in the United States, about 10 percent are classified as severe.
		The National Weather Service considers a thunderstorm severe if it produces hail at least ¾-inch in diameter, winds of 58 mph or stronger, or a tornado.
	www.state.nj.us /njoem/plan/thunderstorm.html (333 words)

	index
		At NOAA's National Severe Storms Laboratory, we have begun a project to estimate the likelihood of severe weather hazards in the United States.
		(Severe thunderstorms are defined in the United States as having either tornadoes, gusts at least 58 mph, or hail at least 3/4 inch in diameter.) The figures are of three primary kinds:
		Animated loops of the probability of severe weather occurring within 25 miles of any point on a particular day with images once per week through the year (Animated Loops).
	www.nssl.noaa.gov /hazard (165 words)

	FEMA: Are You Ready?
		Thunderstorms typically produce heavy rain for a brief period, anywhere from 3 0 minutes to an hour.
		About 10 percent of thunderstorms are classified as severe—one that produces hail at least three-quarters of an inch in diameter, has winds of 58 miles per hour or higher, or produces a tornado.
		Severe Thunderstorm: WatchTells you when and where severe thunderstorms are likely to occur.
	www.fema.gov /areyouready/thunderstorms.shtm (869 words)

	Thunderstorms - Environment Canada
		Summer thunderstorms are a fairly common occurrence in most areas of Canada, providing much-needed precipitation for gardens, crops, and other purposes.
		Environment Canada will issue a severe thunderstorm or tornado warning if heavy rain, high winds, tornadoes, hail or intense lightning are present or expected.
		Good places to be during severe storms are basements, storm cellars, and fall-out shelters, or underneath stairs or sturdy furniture in the centre of the house.
	www.mb.ec.gc.ca /air/summersevere/ae00s20.en.html (585 words)

	Washtenaw County - Severe Weather
		Conditions are favorable for the development or approach of severe thunderstorms in and close to the watch area.
		Conditions are favorable for the development or approach of severe thunderstorms and tornadoes in and close to the watch area.
		A severe thunderstorm (a storm with winds in excess of 58 miles per hour or with 3/4" or larger hail, or both) is indicated on radar or has been reported by a Skywarn spotter.
	www.ewashtenaw.org /government/departments/emergency_management/em_severe.html (1066 words)

	Severe Thunderstorm Images of the Month Archives - 2000
		The potential for storms on this day was verified by early afternoon as severe thunderstorms developed and headed straight for the Wollongong region.
		There were several potential cumulus in the Sydney area but they could not break the "cap".
		It was one of the most spectacular set of storms in recent years watched by several storm watchers.
	www.australiasevereweather.com /storm_news/arc2000.htm (1344 words)

	USATODAY.com (Site not responding. Last check: 2007-10-13)
		The NWS declares that a thunderstorm is severe if wind gusts reach 57.5 mph or faster, if hail is three quarters of an inch in diameter or bigger, or if the thunderstorm produces a tornado or tornadoes.
		Whether a thunderstorm is severe or not, lightning is a danger with any thunderstorm.
		Downdrafts in severe thunderstorms can create gusty winds with speeds that have been recorded as high as 160 mph.
	www.usatoday.com /weather/tg/wsevstrm/wsevstrm.htm (261 words)

	Severe Thunderstorm Watches - Severe Thunderstorm Watches - Severe Thunderstorm Watches (Site not responding. Last check: 2007-10-13)
		A Severe Thunderstorm Watch is a short-fuse bulletin issued by the National Severe Storms Forecast Center (NSSFC) also referred to as the Storm Prediction Center (SPC) when there is a high probability of severe thunderstorms occuring in or around the watch area.
		Severe thunderstorm watches take into effect many synoptic and mesoscale features, and should provide a heads up to potentially severe weather.
		When severe thunderstorm watches are issued, they are entered in the AFOS system where they are routed to the central AFOS facility in Maryland and then disbursed through various channels.
	www.stormwarn.com /rants/severe_thunderstorm_watches.html (137 words)

	Expertise, weather, radar meteorolgy, severe thunderstorm characteristics, Doppler Radar Technology, thunderstorms; ...
		Lemon has 37 years of industry experience with a focus on thunderstorm research, radar meteorology, storm-damage evaluation, thunderstorm and radar meteorology training, weather forecasting, and operational radar technique and signature development.
		Lemon is a recognized authority in severe thunderstorm and mesocyclone structure and evolution and speaks extensively on these topics.
		He is known internationally because of his discoveries, "The Lemon Technique,” his supercell model, and his weather radar and severe storm applications and interpretation training, as well as design and development of NEXRAD for which he received an AMS award.
	www.stormeyes.org /LRLemon/Summary.php (233 words)

	WeatherTalk :: Severe Weather :: Severe Thunderstorm Warning
		Thunderstorms this afternoon were still widely spaced across Central Alabama, but a few of them have become strong.
		At 3:20 p.m., the main part of the thunderstorm was just north and west of Gardendale and moving toward the south-SW.
		The worst of the thunderstorm was west of I-65 North.
	jamesspann.com /bmachine/post/wxtalk/5216/Severe-Thunderstorm-Warning (149 words)

	w_coast_weather: Severe Thunderstorm Watch
		This is an alert to the potential development of severe thunderstorms with large hail and damaging winds.
		Thunderstorms are expected over southern bc in association with an upper disturbance.
		Thunderstorms are also expected to develop over Washington State later this afternoon.
	community.livejournal.com /w_coast_weather/159946.html (116 words)

	FEMA For Kids: Important Terms
		Thunderstorms affect small areas when compared with hurricanes and winter storms.
		The typical thunderstorm is 15 miles in diameter and lasts an average of 30 minutes.
		Thunderstorms often occur in the late afternoon and at night in the Plains states.
	www.fema.gov /kids/thunder.htm (289 words)

	SEVERE THUNDERSTORM STRUCTURE
		Within a severe storm, moisture is transported from the lower troposphere to deep into the upper troposphere.
		That part of the updraft that has the greatest momentum will form the overshooting top on a severe thunderstorm.
		Mammatus tend to be most prominent in extremely severe storms but can occur when storms are not severe also.
	www.theweatherprediction.com /severe/structure (801 words)

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