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Topic: Microburst

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	Microburst Handbook
		Microbursts also pose hazards to small sailboats that are capsized by sudden-shifting, strong winds, and to those fighting forest fires, who may be suddenly engulfed in a fire storm fanned up in an unexpected direction by a microburst.
		A vortex roll-up of a microburst with precipitation curl (Fig.
		The microburst is rendered visible by an expanding ring of dust under a virga shaft descending from a high-based cumulonimbus.
	www.cimms.ou.edu /~doswell/microbursts/Handbook.html (5328 words)

	USATODAY.com
		In a tornado, the air is rising as it swirls around the vortex.
		In addition to damaging buildings and blowing down trees, microbursts blasting down to the ground are a major aviation hazard and have caused several crashes.
		Microbursts are most common from the Rockies eastward in the USA because showers and thunderstorms are more common.
	www.usatoday.com /weather/tg/wmcrbrst/wmcrbrst.htm (236 words)

	KSNT Time-Lapse Skycam Microburst Video (Site not responding. Last check: )
		A microburst is a small, very intense downdraft that descends to the ground resulting in a strong wind divergence.
		Microbursts are capable of producing winds of more than 100 mph causing significant damage.
		Microbursts are sub-classified as dry or wet Microbursts, depending on how much rain accompanies the microburst when it reaches the ground.
	www.ksnt.com /weather/microburst (189 words)

	Non-Tornadic Severe Weather Phenomena
		Microbursts are sub-classified as dry or wet microbursts, depending on how much (or little) rain accompanies the microburst when it reaches the ground.
		While spotting microbursts may not seem as dramatic as spotting tornadoes, it is important to the NWS, the public, and the aviation interests that microbursts be identified and reported.
		As the microburst reaches the ground and moves away from its impact point, a plume of dust may be raised from the ground.
	www.tsgc.utexas.edu /stars/tssevere.html (654 words)

	Microbursts: downburst less than 2.5 miles in diameter
		During the outburst stage (above), the wind "curls" as the cold air of the microburst moves away from the point of impact with the ground.
		The cloud on the left is developing, whereas the fuzzy anvil on the right has matured and is producing a trail of virga.
		Microbursts would be most likely to occur beneath the virga, when the downdraft reaches the ground.
	ww2010.atmos.uiuc.edu /(Gh)/guides/mtr/svr/comp/out/micro/home.rxml (291 words)

	Enhanced microburst detection system - Patent 5973635
		Microburst activity regions are then identified as shapes having contiguous or continuously connected areas in the smoothed likelihood image that exceed a minimum threshold of likelihood value.
		Generating an estimate of a microburst's strength is a valuable parameter that was not available prior to the present invention and can be used to determine the level of warning given to aircraft proximate to or presently encountering a microburst.
		The microburst shape 710, commonly referred to as the "shape", is illustrated as the traditional dark bold polygon outline of an actual microburst.
	www.freepatentsonline.com /5973635.html (7198 words)

	MICROBURST (Site not responding. Last check: )
		Microbursts are recognized as generating wind speeds as high as 75 meters per second.
		The scale of a microburst makes it a great danger to aircraft, particularly those which are taking off and landing.
		A number of fatal crashes have been attributed to microbursts in the vicinity of airports.
	www.yotor.org /wiki/en/mi/Microburst.htm (131 words)

	Microburst Web-Based Software - Online Scheduling Software, SignUp Software, In Out Board Software, Directory Software
		To discuss your needs, e-mail us with your information, and a representative will contact you to discuss how this hosted service might be customized for you.
		Microburst can provide resources and consulting services to help meet software development goals.
		E-mail us to discuss your needs and find out how Microburst can help your business succeed.
	www.uburst.com (432 words)

	Severe microburst event in Utah
		The vertical reflectivity structure of the microburst storm at 0213 UTC is shown in Figure 3.
		Thus, the microburst has been in progress for several minutes, most likely beginning sometime very close to 0144 since, after that time, the "core" began to collapse resulting in a circular echo shape even before 0213.
		The weak reflectivity in the storms that produced severe microbursts on this day were in sharp contrast to the high reflectivity storms occurring simultaneously to the northwest.
	www.wrh.noaa.gov /wrh/LITETAs/TALITE9612/talite9612.html (1068 words)

	[No title]
		Low altitude encounters with microbursts were especially hazardous to aircraft because the first effect a pilot would notice was a performanceenhancing headwind (as the plane first encountered the outflow of the burst).
		Passive infrared radiometry was based on the premise that since microbursts were formed by a column of cooler, rapidly descending air, their presence would be marked by a sharp temperature shift in the air ahead of the airplane.
		The procedure was to enter each microburst with an indicated airspeed of 210 knots and then, as the plane encountered the initial headwinds, add power as necessary to maintain at least a 210 knot groundspeed.
	oea.larc.nasa.gov /trailblazer/SP-4216/chapter5/ch5.html (9009 words)

	Microburst 3000 - Automatic Air Freshener & Air Neutralizer Dispensing System
		Microburst 3000 air fresheners are the most effective compact dispensing system with revolutionary odor neutralizing and fragrancing technology.
		The Microburst 3000 dispenser is half the size of standard aerosol dispensers and has the only "proactive" display that provides advance notice when a refill or batteries will need to be replaced.
		The Microburst 3000 refills are three times the power-per-ounce of traditional aerosols which provide full strength odor control for up to 168 days.
	www.airdelights.net /cgi-bin/store/ordermb3000.html (232 words)

	OVERVIEW OF WET MICROBURST FORECASTING - Introduction
		Microbursts pose a risk to life and property, as well as being a significant threat to the aviation community.
		Although difficult at times, accurate and timely forecasts for microbursts may be possible if proper forecasting techniques are used.
		Wet microbursts are downbursts accompanied by significant precipitation at the surface (Fujita, 1985) which are warmer than their environment (Wakimoto, 1998).
	www.wdtb.noaa.gov /workshop/psdp/Roeder (426 words)

	wind shear-Downburst Page (Site not responding. Last check: )
		Microbursts (also known as downbursts) are powerful downdrafts associated with thunderstorms.
		Downdrafts associated with Microbursts are typically only a few hundred to a few thousand feet across.
		This is the type of microburst that caused the damage in Duval county on May 27, 1997.
	www.srh.noaa.gov /jax/events/windshear.html (409 words)

	Science News: Mastering the microburst; these elusive winds drop from clouds and sweep planes out of the sky, but ...
		When an airplane enters a microburst, it first runs into a headwind, which increases the speed of the air that is rushing over the wings and gives the plane additional lift.
		After the plane passes through the downdraft in the center of the microburst, it is swept by a tailwind, which robs the plane of lift.
		Fujita is generally credited as being thefirst to deduce the existence of microbursts, during an aerial survey of tornado damage in 1974.
	www.findarticles.com /p/articles/mi_m1200/is_v131/ai_4757225 (1450 words)

	Hurricane Damage Leads to "Microburst" Research in College Woods \|
		A native of Ohio, Prengaman said she wasn’t that familiar with hurricanes and didn’t want to stick around for an up-close look at one of nature’s fiercest weapons—a storm that later toppled hundreds of trees on campus, including many in the College Woods.
		Included in the research will be a close look at a 15-acre area where Ware believes a “microburst,” a tornado-like wind, spun off the massive storm and snapped dozens of trees like toothpicks.
		In other areas, such as where Ware believes the microburst occurred, the remains of dozens of trees still partially stand with the tops of their trunks and branches missing or splintered.
	www.wm.edu /news?id=3211 (1084 words)

	Resort's tree damage points to microburst
		LITCHFIELD PARK - A microburst during Sunday evening's storm was the likely culprit in the downing of more than a dozen trees and substantial damage to a handful of others within town limits.
		A microburst occurs when air rushes downward out of a thunderstorm, hits the ground and rushes outward in all directions, creating damaging wind shears.
		Officials believe a microburst is responsible for the damage.
	azcentral.com /community/westvalley/articles/0718stormwigwam-on.html (384 words)

	Windshear-Microburst display page (Site not responding. Last check: )
		Virga is rain that evaporates before it reaches the ground and is associated with a dry Microburst.
		Here is a diagram of a Microburst this picture shows the Microburst coming straight down, which is a symmetric Microburst.
		Here the wind is at the tail of the craft and the wind speed is subtracted from the ground speed and the airplane may not have enough airspeed to stay in the air.
	www.math.unl.edu /~jfisher/NSF_96/windshear.html (670 words)

	MicroBurst bursts onto data scene: Aeris gives wireless telemetry a new look (Site not responding. Last check: )
		Where MicroBurst is distinct, at least as far as Aeris is concerned, is in its simplicity.
		Carriers that enable MicroBurst to be carried over their networks receive a straight percentage of revenue from roaming devices, he said.
		MicroBurst is a two-way system in theory, but it is only capable of sending pre-programmed trigger messages over the downlink.
	telephonyonline.com /mag/telecom_microburst_bursts_onto (1040 words)

	[No title]
		Microbursts in violent thunderstorms can unleash winds of more than 100 mph over an area that can extend many square miles.
		Those caught under severe microbursts often mistake them for tornadoes, because the mighty downburst of wind can create a large roar and produce similar damage.
		This microburst probably contained winds of between 50 mph and 60 mph right where it came to the surface, which was probably right on the Salem stadium/civic center grounds.
	www.roanoke.com /weather\4726.html (766 words)

	Microburst 9000 - Automatic Air Freshener & Air Neutralizer System
		Microburst 9000 air fresheners and air neutralizer are the most effective, long-term air freshener dispensing system with revolutionary odor neutralizing and fragrancing technology.
		The Microburst 9000 refills are three times the power-per-ounce of traditional aerosols.
		Microburst air Neutralizer refills are 3 times the power-per-ounce of traditional aerosol.
	www.airdelights.com /mb9000.html (297 words)

	The Weather Notebook: Features: Microbursts (Site not responding. Last check: )
		The microburst pattern is indicated by the region of inbound motion (blues and greens) that is associated with an area of outbound velocities (pinks and yellows) located at more distant ranges.
		This is the depiction of a flow pattern that's more or less diverging outwards from a single source region near the ground.
		The formal microburst definition requires that the max velocity differences be within ~4 km of each other.
	www.mountwashington.org /notebook/features/microburst.html (226 words)

	Product Catalog - Microburst 3000 (Site not responding. Last check: )
		The "micro-molecules" spray of Microburst® 3000 Aerosol provides greater coverage and long lasting odor-neutralizing and fragrancing with less propellants.
		The Microburst® 3000 Dispenser Refills are three times the power-per-ounce of traditional aerosols and provide full strength odor control up to 168 days.
		The "micro-molecules" spray of Microburst® provides greater coverage and longest-lasting odor neutralizing and fragrancing with less propellants.
	www.technicalconcepts.com /pages/products/micro3000.htm (330 words)

	Home Theater: Pinnacle Microburst MB 5500 Speaker System
		With the advent of the Microburst system, also known as the MB 5500, Pinnacle courts comparison with a tough competitor—itself—and poses an additional challenge by pricing the new system at $899 for five satellites plus a sub.
		Unlike a lot of small subs, which try to compensate for their small size by substituting belligerence for subtlety, the Microburst sub was authentically musical in its upper reaches: It held a pitch.
		Initially, I thought the Microburst system was voiced identically to its higher-end sister, which I regard as a paragon of neutrality.
	www.hometheatermag.com /loudspeakers/405pinnacle (1327 words)

	OVERVIEW OF WET MICROBURST FORECASTING - Outlook Tools
		MDPI was developed at the 45WS and NASA/Applied Meteorology Unit (AMU) as a result of a microburst event on 16 August 1994 (Wheeler 1996, 1997).
		It is important to remember that WINDEX forecasts a maximum wind gust for dry microbursts.
		Dry Microbursts that form in an area with a high WINDEX value may have weaker wind gusts than predicted.
	www.wdtb.noaa.gov /workshop/psdp/Roeder/sec2.htm (652 words)

	The Microburst as a vortex ring (Site not responding. Last check: )
		Caracena (1982) hypothesized that a microburst could be a vortex ring traveling downward along the edge of a downdraft.
		Brain Waranauskas’s photographs of a dry microburst during the JAWS project taken in rapid succession show the rapid decay of its vortex circulation.
		A microburst periodicity was observed in the crash of Pan American Flight 769 (see Caracena et al., 1983; Fujita, 1983), and has also been observed in field experiments.
	www-frd.fsl.noaa.gov /~caracena/micro/MBVoring.htm (370 words)

	Was that a tornado or a microburst?
		Instead of a swirling vortex of air (as seen in a tornado), a microburst is a type of downdraft, like a column of wind blowing straight down from the storm cell onto the ground.
		In meteorological terms, microbursts, as suggested by their nomenclature, are restricted to smaller areas.
		Reflecting on yesterday's potentially lethal microburst, Coulson says, "I think people have to be aware that when they're hearing severe thunderstorm warnings issued anywhere in Canada, one of the criteria is this potential that damaging winds could be coming out of this thunderstorm."
	www.exn.ca /html/templates/htmlpage.cfm?ID=19990608-54&Parent=Science (649 words)

	Microburst
		We were in the middle of a Microburst, or collapsing thunderstorm that is capable of producing wind damage similar to that of a strong tornado.
		Just as she got up, I yelled to her that "This is a Microburst and to get away from the windows!" She turned and ran back deeper into the office and ducked down behind a room divider.
		It only showed on radar for about a minute or two and then was gone, but it sure did a bunch of damage in the short time it was here.
	www.alpharubicon.com /warlord/survpage/microburstreddog.htm (1640 words)

	Microburst Automatic Detection (MAD™)
		MAD is a simple, user-friendly system with a small number of adjustable parameters that allow for easy modification of the algorithm to better process data for a specific location or prevailing conditions.
		Fuzzy logic data analysis techniques are used to detect and identify the size and location of microburst activity within a radar image on a real-time basis, presenting the user with likelihood images of such activity.
		A radar scan is transformed into a likelihood image through likelihood mapping, which uses input fields that include, but are not limited to, radial velocity, reflectivity, wind-shear estimates, and clutter maps.
	www.nasatech.com /Briefs/Apr98/0498PTB2.html (551 words)

	Microbursts
		A microburst is a three-dimensional circulation pattern of damaging winds driven outward near the surface by the ground impact of an unusually strong convective downdraft.
		The aircraft accident rate due to microbursts in association with classic severe local storms is practically nonexistent for commercial aviation, since the system is apparently well designed to protect passenger jets against well-organized, long-lived, and highly reflecting storms and therefore automatically protects aircraft from any microburst components of these storms.
		Atkins and Wakimoto (1991) analyzing data from the 1986 MIST (MIcroburst and Severe Thunderstorm) project conducted in northern Alabama found that in all five days when wet microburst occurred, the equivalent potential temperature differences between the surface value and the minimum aloft were 20 deg K or greater.
	www-frd.fsl.noaa.gov /mab/microburst/micro_course.html (1614 words)

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