WHAT'S NEW
The "About Derechos" web pages became a part of the NOAA, NWS, Storm Prediction Center's web site on June 24, 2004. Additional information will be added and significant changes may be made to the web pages from time to time. When that is done, a note will be placed on the "What's New" page stating what information has been added or what change has been made and showing the date when this was done.
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September
25, 2008.....
A video clip of an approaching derecho, which was recorded by Paul Knightley
near Shattuck, OK, has been added to the May
27-28, 2001 derecho case page.
April
12, 2006.....
Information about the derechos that have occurred in the United States during
the years 2004 and 2005 has been
added to the web site. This information includes maps showing the derecho
paths, listings of the dates when the derechos occurred and the states that
were affected, and links to the Storm Prediction Center storm report archives
for each event.
March
29, 2005.....
The May 17, 1986 historical derecho
event page has been added to the web site. This event is called the "Texas
Boaters' Derecho" since it capsized hundreds of pleasure boats. Six people
drowned and over a hundred had to be rescued. This event page also includes
a scary story told by a boater that was on Lake Livingston on that tragic
day.
January
19, 2005.....
The May 27-28, 2001 historical derecho
event page has been updated with two gust front photographs as well as
some Doppler on Wheels radar images.
January
9, 2005.....
Climatological maps showing the frequency
of derecho occurrence in the United States have been added. These maps are
for the"moderate and high" intensity events.
December
1, 2004.....
Information and personal stories about two derechos which caused major long-lived
electrical power outages in large cities in the United States have been added.
One of the example cases struck the Kansas
City, Missouri metropolitan area on June 7, 1982 and the other case struck
the Memphis, Tennessee
metropolitan area on July 22, 2003.
November,
23, 2004.....
The personal story about
Sarah Jamison's scary experience while camping in a forest in western Maine
during the passage of a strong derecho has been added to the July 4-5, 1999
historic derecho case page.
September
26, 2004.....
An audio file allowing you
to hear how the word "derecho" is pronounced has been added to the
"Derecho Definition" section of facts page.
August
14, 2004.....
Radar images and movie loops along with explanatory text have been added to
the Quebec portion of the July
4-5, 1999 Boundary Waters/Canadian derecho case page.
July 21,
2004.....
Three photographs and some additional information have been added to the July
19, 1983 historic derecho case page concerning the derecho's passage through
Madison, Wisconsin. The photographs show the laminar-layered shelf cloud and
associated gust front crossing Lake Mendota towards the University of Wisconsin
campus as well as post-derecho waves on Lake Mendota.
July 5,
2004.....
Information has been added to the May
27-28, 2001 historic derecho case page explaining why this derecho was
called the "people chaser" derecho. Also, a paragraph has been added
to the same case page explaining the "haboob" gust front that developed
during the initial stages of the derecho event.
June 26, 2004.....
State and Province abbreviations (in dark green) have been added to the figures
associated with the "Historic Derecho Event" cases. Also the following
abbreviations for the Great Lakes (in orange) have been added to those figures:
Lake Superior (LS), Lake Michigan (LM), Lake Huron (LH), Georgian Bay (GB),
Lake Erie (LE), and Lake Ontario (LO). In the text for the historic cases,
the abbreviations have been placed after the first appearance of the state
[for example, Minnesota (MN)] or province [for example, Quebec (QC)] or the
lake [for example, Lake Michigan (LM)].