Wind Damage >> Biggest Tornado Disasters

A downburst cluster itself is made up of several downbursts. A downburst is an area of strong, often damaging wind produced by a convective downdraft with the overall size of the downburst varying from 4 to 6 miles (8 to 10 kilometers). Within the downbursts are microbursts; Biggest Tornado Disasters smaller pockets of more intense wind. 

While not shown in the illustration at right, within the microbursts are even smaller pockets of extreme Biggest Tornado Disasters wind called burst swaths. Burst swaths can range from 50 to 150 yards (45 to 140 meters) long. The damage pattern from burst swaths can often resemble a path of a tornado. 

Due to this nature of the derecho, damage produced by these wind storms is highly variable along its path. Damage surveys following derecho events Biggest Tornado Disasters have shown that within large areas of overall damage are much smaller pockets of intense damage. It is not uncommon for one house to be nearly destroyed while adjacent houses have relatively minor damage. 

Derechos are produced by long-lived thunderstorm complexes that produce bow echoes. NOTEWORTHY EVENTS Many significant derechos (i.e., those that have caused severe damage and/or casualties), Biggest Tornado Disasters have occurred over North America during the last few decades. Most of these affected central and eastern parts of the United States and Canada. 

Linked below are brief summaries of some of these events. The list is not all-inclusive, and additional cases will be added as time permits. Information includes a map of the area affected, Biggest Tornado Disasters a description of the storm's impact and meteorology, and, where available, links to additional information. Holiday weekend events 

The human impact of the following events was enhanced by their occurrence on summer holiday weekends, Biggest Tornado Disasters causing many to be caught out-of-doors during the sudden onset of high winds... July 4, 1969................"The Ohio Fireworks Derecho"....MI, OH, PA, WV July 4, 1977................

"The Independence Day Derecho of 1977"....ND, MN, WI, MI, OH July 4-5, 1980............"The 'More Trees Down' Derecho"....NE, IA, MO, IL, WI, IN, MI, OH, PA, WV, VA, MD Sept. 7, 1998............."The Syracuse Derecho of Labor Day 1998"....NY, PA, VT, MA, NH Biggest Tornado Disasters Sept. 7, 1998.............

"The New York City Derecho of Labor Day 1998"....MI, OH, WV, PA, NJ, NY, CT July 4-5, 1999............"The Boundary Waters-Canadian Derecho"....ND, MN, ON, QB, NH, VT, ME Biggest Tornado Disasters The derechos of mid-July 1995 The mid-July 1995 derechos were noteworthy for both their intensity and range... Series Overview..........

Montana to New England July 12-13, 1995........"The Right Turn Derecho"....MT, ND, MN, WI, MI, ON, OH, PA, WV Biggest Tornado Disasters July 14-15, 1995........"The Ontario / Adirondacks Derecho"....MI, ON, NY, VT, NH, MA, CT, RI Low dewpoint derechos In contrast to most derechos, these events occur in environments of very limited moisture... 

Nov. 20, 1989............."The Mid-Atlantic Low Dewpoint Derecho of November 1989"....PA, NJ, NY, MD, DE Biggest Tornado Disasters May 31, 1994............."The Utah / Wyoming Derecho of May 1994"....UT, WY, ID, CO Serial derechos Three well-documented events that affected parts of the central and eastern United States... April 9, 1991...............

"The West Virginia Derecho of 1991"....AR,TN, MS, AL, KY, IN, OH, WV, VA, MD, PA Biggest Tornado Disasters March 12-13, 1993...."The Storm of the Century Derecho"....FL, Cuba April 19-20, 2011......."The Ozarks / Ohio Valley Derecho of April 2011"....OK, TX, AR, MO, IL, IN, OH, KY, TN, MS, AL 

"Southward bursts" "Southward burst" is a term coined by Porter et al. in a 1955 paper (see reference here) to describe a progressive-type squall line that surges rapidly southward rather than east... Biggest Tornado Disasters May 4-5, 1989............"The Texas Derecho of 1989"....TX, OK, LA May 27-28, 2001......."The People Chaser Derecho"....KS, OK, TX 

Other noteworthy events June 7, 1982.............."The Kansas City Derecho of 1982"....KS, MO, IL July 19, 1983.............."The I-94 Derecho"....ND, MN, IA, WI, MI, IL, IN May 17, 1986............."The Texas Boaters' Derecho".....TX July 28-29, 1986........"The Supercell Transition Derecho"....IA, MO, IL Biggest Tornado Disasters July 7-8, 1991............

"The Southern Great Lakes Derecho of 1991"....SD, IA, MN, WI, MI, IN, OH, ON, NY, PA May 30-31, 1998......."The Southern Great Lakes Derecho of 1998"....MN, IA, WI, MI, ON, NY Biggest Tornado Disasters June 29, 1998............"The Corn Belt Derecho of 1998"....NE, IA, IL, IN, KY July 22, 2003..............

"The Mid-South Derecho of 2003"....AR, TN, MS, AL, GA, SC May 8, 2009..............."The 'Super Derecho' of May 2009"....KS, MO, AR, IL, IN, KY, TN, VA, WV, NC July 10-11, 2011........"The Cross Country Derecho of July 2011"....CO, KS, NE, IA, IL, WI, IN, MI, OH, KY, WV, PA, MD, VA Biggest Tornado Disasters June 29, 2012............

"The Ohio Valley / Mid-Atlantic Derecho of June 2012"....IL, IN, KY, OH, WV, PA, VA, MD, DE, NJ, NC Biggest Tornado Disasters The maps link to a display of all severe weather reports and locations in the Storm Prediction Center data base for the day of the event. 

The records are preliminary and do not include official National Weather Service final storm report information listed in Storm Data; the data also do not include reports from Alaska and Hawaii. The maps do, Biggest Tornado Disasters nevertheless, provide a general idea as to the typical geographical and seasonal distribution of severe wind-producing events in the United States. 

Information on significant derechos that have occurred since 2005 will be added, on a time-permitting basis, to Noteworthy Events. PICTURES AND VIDEOS A video has been prepared by Biggest Tornado Disasters the Atmospheric Environment Service of Canada on the progressive derecho that crossed the Pakwash forest of northwest Ontario on July 18, 1991. 

This video includes camcorder footage of the storm affecting a forested area, post storm aerial views of the forest "blowdown", and Biggest Tornado Disasters interviews with people that experienced the storm. On May 27-28, 2001, a "Southward burst" derecho affected parts of the southern Great Plains from southwest Kansas into central Texas. 

Numerous photographs of the menacing gust front cloud structure associated with the derecho, and videos showing the damaging winds in progress, Biggest Tornado Disasters were taken on that day. A few images from the event may be seen by clicking the hyperlink at the beginning of this paragraph. 

REFERENCES Here is a list of selected of research papers on derechos and the convective systems responsible for their development. In addition to presenting analyses of some well-documented events, Biggest Tornado Disasters these papers describe what is known about the formation and mechanics of derecho-producing convective systems.

Storm Damage

Immediate reaction to a Water Damage Storm Damage emergency redeems time and money, and guards traits and health. The main goals of controlling water damage are well known to professional water damage restorers and public health professionals. These goals are to guard public hea  read more..

Mold Problems Cause Asthma

Anyone can have asthma, including infants and adolescents. The tendency to develop asthma is often inherited; in other words, asthma can be more common in certain families. Moreover, certain environmental factors, such as viral infections, may bring the onset of asthma. Other environmental factors,   read more..

How To Encapsulate Asbestos Pipes

Asbestos is a mineral fiber. It can be positively identified only with a special type of microscope. There are several types of asbestos fibers. In the past, asbestos was added to a variety of products to strengthen them and to provide heat insulation and Asbestos Abatement How To Encapsulate Asbestos Pipes fire resistance. How Can   read more..

How To Catch Birds In The Home In Arizona

The problem of starling damage to livestock feed has been documented in France and Great Britain, and in the United States. As the science of raising cattle for slaughter progressed from range to feedlot operations, the starling Animal Damage How To Catch Birds In The Home In Arizona problem intensified. 

The concent  read more..

How To Clean Up After Fire Damage

The correlation is even stronger than just by the day of test. Because each test had a 250 nm probe and a 4500 nm probe, the test-to-test correlation was strong as seen in Figure 11. The strength of the correlation seems to reinforce the variability in the performance of the material and not just un  read more..

F5 Tornado Facts

As the cold pool elongates, repetitive storm growth on the downwind-moving, progressive part of the gust front comprises the derecho-producing convective system (red arc in bottom cross section of figure below, and Wind Damage F5 Tornado Facts on right side of plan view inset). 

Meanwh  read more..

Radon Gas

What is Radon gas? Radon gas is a gas produced by the radioactive decay of the element radium. Radioactive decay is a natural, spontaneous process in which an atom of one element decays or breaks down to form another element by losing atomic particles (protons, neutrons, or electrons). When solid ra  read more..

What To Do If Hardwood Floors Have Flood Damage

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Roof Damage Insurance Claim Tips

Roofing systems commonly rely on roof sheathing and bottom chords to provide lateral support for the roof trusses. Oliver and Hanson (1994) and Riba et al. (1994), agree that roofing systems could be considerably improved if simple secondary bracing were installed between Wind Damage Roof Damage Insurance Claim Tips trusses.&nbs  read more..

Best Way To Remove Hurricane Damage Debris

FEMA concurs with this recommendation. FEMA encourages PA applicants to use force account labor to conduct their debris removal operations. FEMA currently reimburses PA applicants for force account overtime hours. FEMA also reimburses applicants for the use of Debris Removal Best Way To Remove Hurricane Damage Debris equipment. Current FEMA   read more..