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Topic: Downburst

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	What is a downburst?
		A downburst is a localized area of damaging winds caused by air rapidly flowing down and out of a thunderstorm.
		To create a downburst at the ground, the downward (downdraft) speeds in the thunderstorm must be unusually high, and this downward flowing air must penetrate close to the ground.
		An usually strong and widespread downburst event hit northern Wisconsin on the 4th of July, 1977, with winds that were estimated to exceed 115 mph, and completely flattening thousands of acres of forest.
	www.weatherquestions.com /What_is_a_downburst.htm (199 words)

	Science Question of the Week - summer thunderstorms - May 28, 2004
		Downbursts are an intense type of downdraft in a thunderstorm.
		A downburst is an especially violent descending bubble of air, usually less than 1 mile in diameter.
		Remember...in a tornado, the wind and debris move inward toward the center, and then upward; in a downburst, the flow is reversed...air first moves downward to the surface from aloft, then spreads outwards along the ground.
	www.gsfc.nasa.gov /scienceques2003/20040528.htm (721 words)

	WFO SHV - Downburst Climatology and Warning Guidelines
		A downburst is defined as a rapid downdraft of wind from a single cell thunderstorm which produces a sudden outflow of horizontal winds at the surface (Fujita 1981).
		The cases we examined indicate that SVC is a good predictor of a potential downburst when it is present in or near the high reflectivity core of a single cell storm, somewhere within the 5,000 to 11,000 ft AGL layer.
		Downbursts occurred in the summer season from early June through the end of September, and were much more common than we previously suspected.
	www.srh.noaa.gov /shv/Downburst_Climo.htm (3212 words)

	Downburst - Wikipedia, the free encyclopedia
		A downburst is a column of sinking air that is capable of producing damaging straight-line winds of over 150 mph (240 km/h), often producing damage similar to, but distinguishable from tornadoes.
		Likewise, the damage pattern left by a downbursts' straightline winds in the wake of an intense thunderstorm sometimes is often confused with that of a tornado.
		Downbursts in air that is precipitation free or contains virga are known as dry downbursts; those accompanied with precipitation are known as wet downbursts.
	en.wikipedia.org /wiki/Downburst (420 words)

	NASA Quest > Aerospace Team Online (Site not responding. Last check: 2007-10-18)
		This type of weather phenomenon, often called a downburst, is caused by the same type of conditions that cause tornadoes and occur often in the Midwest.
		A tragic example was in 1985 when an aircraft landing at Dallas-Fort Worth airport during a thunder storm hit a downburst causing it to loose altitude very rapidly and crash, killing people on the aircraft and on the ground.
		From flbox flight data, we were trying to understand what the wind profile of a downburst looked like so that we could develop flight procedures that would help a pilot identify and respond to a wind shear encounter.
	quest.arc.nasa.gov /people/journals/aero/coppenbarger/micro.html (532 words)

	Thunderstorms
		Lightning, tornadoes, downbursts, hail and flooding rainfall are all dangerous by-products of thunderstorms that could be lethal to the unknowing and unprotected.
		In Florida, the occurrence of downburst (straight) winds outnumber tornado (rotational) winds from a severe thunderstorm by nearly a 10 to one ratio.
		Downburst winds of 58 miles per hour or greater are considered severe.
	www.floridadisaster.org /bpr/Response/Plans/Nathaz/HazWX/Tornado/thunderstorms.htm (675 words)

	Thunderstorms 2002 (Site not responding. Last check: 2007-10-18)
		In Florida, the occurrence of downburst (straight) winds outnumber tornado (rotational) winds from a severe thunderstorm by nearly a ten-to-one ratio.
		Downburst winds of 58 mph or greater are considered severe.
		Downbursts can cause damage similar to that of a strong tornado, and cause loss of life or significant bodily injury from wind blown debris and toppled structures.
	www.floridadisaster.org /hwaw/day3/thunder.htm (1070 words)

	Leah Fastow Goes to Prison
		A downburst was reported 1 mile east of Raiford, Florida at 30 N., for a priest, and 82 W., for an historical brreakpoint.
		The downburst at Raiford Prison in Florida was n Union County #63, for an outcast, at 30 N., for a priest, and 82 W., for an historical breakpoint.
		A downburst at Raiford Prison in Florida in the region of Zebulun heralded the incarceration of Leah Fastow, a Jew in Houston in the region of Reuben.
	www.biblenews1.com /history4/20040712.htm (756 words)

	USATODAY.com (Site not responding. Last check: 2007-10-18)
		These winds, known as "downbursts," are often mistaken for tornadoes due to the severity of the damage.
		A downburst features air diving toward the surface, whereas a tornado is composed of rising air.
		Downburst can affect a much larger area and for a longer period of time.
	www.usatoday.com /weather/tg/wdnburst/wdnburst.htm (242 words)

	Wicked 'downburst' socks Ulster
		The storms were described as "downbursts" or "straight-line winds" by Mark McKinley, a meteorologist with the National Weather Service.
		Downbursts happen when strong, fast-moving winds in the upper atmosphere get sucked to earth in a downdraft and hit the ground.
		The downburst left residents dumbfounded with its terrible force and brevity.
	www.recordonline.com /archive/2000/08/11/jdhstorm.htm (560 words)

	A LABORATORY SIMULATION OF THE THUNDERSTORM DOWNBURST USING CARBON-DIOXIDE
		The downburst or microburst (smaller scale) is an intense, penetrative downdraft, which spreads outward in all directions upon reaching the surface (see figure 9) (11)(32).
		Similar to the RFD, the downburst would be circulated by the mesocyclone counter-clockwise from the origination point to the rear flank of the thunderstorm.
		In all four models, the contribution of dry air impinging the supercell thunderstorm along the rear-flank is vital to the downward acceleration (from evaporative cooling) of the downburst toward the surface (34)(35)(37).
	oas.ucok.edu /OJAS/01/papers/tidwell01.htm (5714 words)

	Downburst season blows in - PittsburghLIVE.com
		Downbursts -- walls of wind that drop out of thunderstorms and can move faster than 100 mph -- hit the area around Pittsburgh more often than anywhere else in the nation, weather forecasters say.
		When a thunderstorm is brewing that might create a downburst, storm watchers at the National Weather Service issue a "severe thunderstorm watch." If the storm is raging in some part of the county and the threat of a downburst is imminent, the watch is upgraded to a warning.
		Downbursts were first discovered by weather watchers researching mysterious airplane crashes.
	pittsburghlive.com /x/valleyindependent/tribune-review/s_137392.html (958 words)

	The Weather Doctor: Weather Whys
		The microburst is a downburst which is confined to a small area, less than 4 km (2.5 miles) in diameter from the initial point of downdraft impact.
		Downbursts occur in regions of a severe thunderstorm where the air is accelerated downward by exceptionally strong evaporative cooling occurs (a dry downburst) or by very heavy rain which drags dry air down with it (a wet downburst).
		Often, damage associated with a downburst is mistaken for a tornado, particularly directly under the downburst.
	www.islandnet.com /~see/weather/whys/ubrst.htm (473 words)

	Loris Scene (Site not responding. Last check: 2007-10-18)
		Unlike the rotation of a tornado, a downburst is a powerful wind gust of cool air that races downwards from higher altitudes during severe storms.
		Downbursts then spread out in the same direction of the storm as straight line winds before dissipating.
		The downburst in Loris moved northeast, which matched the storm's general direction at the time, Steve said.
	www.zwire.com /site/news.cfm?newsid=14602081&BRD=1164&PAG=461&dept_id=98756&rfi=6 (587 words)

	The American Museum of Natural History - EarthBulletin What Drives a Derecho?
		The second critical phase is the formation of a "downburst." As rain falls from the storm, it pulls some upper-level air with it toward the ground, creating a downward movement of wind known as a downdraft.
		Under the right conditions, solitary downbursts can combine to form a large, fast-moving "macroburst." This is the third critical phase in the formation of a derecho.
		Meanwhile, the winds from the downburst hit the ground and begin to spread out, most strongly in the forward direction (because the storm is being pushed from behind).
	earthbulletin.amnh.org /D/2/1 (1212 words)

	[No title]
		Downbursts and tornadoes both come from large thunderstorms but leave behind very different types of damage.
		Downburst winds will typically radiate outward from a central point, while tornadoes produce a more circular pattern.
		More wind damage was caused as the the downburst continued toward Navarre, a town south of Canton, where more trees damaged homes and caused power outages.
	www.wkyc.com /news/news_article.aspx?storyid=53884 (290 words)

	NWS Norman, Oklahoma - Weather Glossary for Storm Spotters
		Derechos include any family of downburst clusters produced by an extratropical MCS, and can produce damaging straight-line winds over areas hundreds of miles long and more than 100 miles across.
		*Downburst - A strong downdraft resulting in an outward burst of damaging winds on or near the ground.
		A downburst is the result of a strong downdraft.
	www.srh.noaa.gov /oun/severewx/glossary2.php (4658 words)

	May 31, 1998 Severe Thunderstorm and Tornado Outbreak
		In Warren county, damage was from strong downburst winds, primarily in the northern part of the county.
		The downburst did most of the damage, and was a mile wide along Montour road in extreme eastern Cameron county.
		While most of the damage was of the downburst variety, at the eastern edge of the downburst, the tree damage pattern indicated that an F0 gustnado, with winds of 40-60 mph and a length of 100 yards, spun up.
	www.angelfire.com /pa/pawx/053198/053198.html (4516 words)

	washingtonpost.com: Weather
		A severe localized downdraft resulting in an outward burst of damaging winds on or near the ground.
		Downburst winds can produce damage similar to a strong tornado.
		Although usually associated with thunderstorms, downbursts can occur with showers too weak to produce thunder.
	washingtonpost.com /wp-srv/weather/longterm/glossary/data/downburst.htm (42 words)

	The Times-Journal (Site not responding. Last check: 2007-10-18)
		A powerful downburst had already destroyed the visiting bleachers at Wildcat Stadium and flattened the outfield fence at the high school baseball field.
		The downburst apparently hit in the open field between Wildcat Stadium and the high school baseball field sometime between 4:50 and 5 p.m., according to DeKalb County Emergency Management Director Susan Battles.
		Battles likened a downburst to dropping a water balloon from a tall building, when the balloon hits the ground, water forcefully gushes in all directions.
	www.times-journal.com /print.lasso?wcd=4440 (486 words)

	Microburst Handbook
		In this handbook, we use the term downburst when no size scale is specified, or when speaking of a severe downdraft of horizontal dimensions exceeding 4 km (2.2 n mi).
		In some situations a downburst may begin as a microburst but subsequently spread out and continue to be strong enough to be classified as a larger scale downburst; however, it is when the downdraft-outflow structure is compact, as in a microburst, that it poses a serious hazard to aircraft.
		Identification of downbursts on Doppler radar is of general interest and is important to air safety wherever such radars are available at airports.
	cimms.ou.edu /~doswell/microbursts/Handbook.html (5328 words)

	Chapter 15 Notes
		Although very intense, a downburst that extends radially for 4 km or less is termed a microburst a downburst with extent greater than 4 km is referred to as a macroburst.
		Strong downburst winds associated with a cluster of severe thunderstorms can produce powerful straight-line winds greater than 90 knots that result in damage for at least 400 km along the storm's path are called derecho winds.
		HP supercells (High Precipitation) produce extreme downbursts, flash flooding, very large hail, and heavy precipitation that appears to fall near the center or eastern part of the storm which may conceal tornadoes.
	www.physics.isu.edu /weather/kmdbbd/unit16_notes.htm (1258 words)

	[No title] (Site not responding. Last check: 2007-10-18)
		"A downburst is a strong downdraft resulting in an outward burst of damaging winds at ground level," said Gunnery Sgt. John B. Badeaux, weather forecaster for the 2nd Marine Aircraft Wing (Forward).
		"Downburst winds can produce damage similar to a strong tornado," he added.
		The ensuing storm increased energy as the winds pushed over the desert, which created a wall of dirt.
	www.trinity.edu /jdunn/sandstorm.htm (286 words)

	The Brownsville Herald - Online Edition (Site not responding. Last check: 2007-10-18)
		Then came the downburst, which looked as if the gut of the cloud dropped at speeds exceeding 100 mph.
		“Downburst winds can be associated with tornadic storms but can produce damage in their own right,” Tomaselli said.
		Downburst winds and flooding are two of the most common severe forms of weather local forecasters want help spotting.
	www.brownsvilleherald.com /ts_comments.php?id=71584_0_10_0_C (567 words)

	KKTV \| Downburst Causes Ellicott Damage
		The National Weather Service says damage to two houses and several barns and sheds in Ellicott earlier this week was caused by a high-wind phenomenon known as a downburst -- not a tornado.
		Authorities say some residents suffered bumps and bruises when a powerful thunderstorm swept across the area Monday, nearly destroying a mobile home and blowing part of a roof onto a house.
		Weather service spokesman James Hall says a survey indicated the debris was lying in a pattern indicating damage caused by a downburst, which is a powerful gust of wind that suddenly rushes down out of a thunderstorm, strikes the earth and spreads quickly out across the ground.
	www.kktv.com /home/headlines/2861401.html (162 words)

	Denton County, Texas - Downburst
		A "downburst" is a strong downdraft which causes damaging winds on or near the ground.
		In this photograph, trees are blown down in a straight line - a very strong indication of a microburst as opposed to a tornado.
		Downbursts are much more frequent than tornadoes - in fact, for every 1 tornado there are approximately 10 downburst damage reports!
	dentoncounty.com /dept/main.asp?Parent=82&Link=84 (753 words)

	Hillsborough: Violent downburst leaves a neighborhood shaken
		The two women and their neighbors experienced a 40- 50-mph downburst from a severe thunderstorm, meteorologists from the National Weather Service said.
		However, the downburst in a major storm can wreak havoc, something milder than a tornado, he said.
		The downburst uprooted tall maples along on the shore of Lake Wood, including two behind Yaryan's home.
	www.sptimes.com /2005/07/13/news_pf/Hillsborough/Violent_downburst_lea.shtml (438 words)

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