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List of SPC High Risk days

The following days had a declaration of a High Risk of severe weather in a certain part of the United States according to the Storm Prediction Center (and its predecessor, the National Severe Storms Forecast Center).

There are 75 known days since 1984 that such a declaration was issued. Busts indicate days that a severe weather outbreak was expected but never materialized, with little or no severe activity. Limited details are available for days before the late 1990s, and it is probable that there were additional High Risk days with no online documentation, especially in the 1980s.

The only month that has not recorded a known High Risk day is September. No High Risk has ever been issued west of the Rocky Mountains.

DateAreaResultsNotes
March 28, 1984Carolinas[1]Tornado outbreak produced ≥24 tornadoes; killed 57Tied for the deadliest High Risk day
May 7, 1988OklahomaBusted; few severe reports
November 15, 1989Southern U.S.[2]Tornado outbreak produced 18 tornadoes; killed 21
March 13, 1990Central U.S.Tornado outbreak produced 56 tornadoes; killed 2Unconfirmed risk level
May 15, 1990OklahomaSmall tornado event produced 19 tornadoes; killed 1
June 2, 1990Ohio ValleyTornado outbreak produced 88 tornadoes; killed 9
April 11, 1991KansasBusted; few severe reports
April 12, 1991Kansas, Oklahoma, TexasModerate tornado/hail eventFirst known back-to-back High Risk days
April 26, 1991Kansas, OklahomaTornado outbreak produced 58 tornadoes; killed 24
April 28, 1991KansasBusted; only a few tornadoes and severe reports
June 16, 1992Midwest[3]Second day of a three-day tornado outbreak produced 65 tornadoes; killed 1
June 17, 1992Great Lakes region[3]Third day of a three-day tornado outbreak produced 29 tornadoes and a large serial derecho; no deaths
June 7, 1993Upper MidwestTornado outbreak produced 41 tornadoes; no deaths
March 27, 1994Southern U.S.Tornado outbreak produced 26 tornadoes; killed 42
April 25, 1994Central U.S.End of tornado outbreak sequence that produced 29 tornadoes and many hail reports; killed 3
August 27, 1994Upper MidwestSmall tornado outbreak produced 12 tornadoes; killed 4Only High Risk ever issued in August
November 27, 1994Southern U.S.Tornado outbreak produced 19 tornadoes; killed 6
April 17, 1995Oklahoma, TexasPrimarily a derecho; but 21 tornadoes (mostly weak) reported
May 7, 1995Kansas, Oklahoma, TexasFirst part of a tornado outbreak sequence that produced 32 tornadoes; killed 3
May 12, 1995KansasSecond part of the same tornado outbreak sequence that produced 13 tornadoes; although mostly a bust
May 13, 1995Ohio ValleyContinuation of the same tornado outbreak sequence that produced 27 tornadoes and a long derecho; killed 3
May 17, 1995KansasContinuation of the same tornado outbreak sequence although again mostly a bust; only 8 tornadoes and few other reports
April 19, 1996Illinois, IndianaTornado outbreak produced 74 tornadoes (plus more the next day); killed 1
May 26, 1996Kansas, OklahomaSmall tornado event became a mini-derecho
May 2, 1997Mississippi, AlabamaProgressive derecho that also produced 8 tornadoes; killed 1
July 1, 1997Upper Mississippi ValleyModerate tornado outbreak reorganized into a progressive derecho
February 10, 1998Texas, LouisianaRare winter serial derecho
April 8, 1998Alabama[4]Tornado outbreak produced 15 tornadoes (mostly in more urbanized areas) plus widespread wind and hail; killed 41
April 15, 1998Middle Mississippi ValleyFirst phase of a two-day tornado outbreak that produced 23 tornadoes; killed 4
April 16, 1998TennesseeSecond phase of a two-day tornado outbreak that produced 38 tornadoes including the Nashville tornado; killed 8
May 31, 1998Northeastern U.S.[5][6]Major derecho and tornado outbreak produced 39 tornadoes and enormous wind damage; killed 7Only High Risk ever issued in the Northeast
June 14, 1998Ohio ValleySmall tornado event produced 22 mostly weak tornadoes followed by a progressive derecho
January 21, 1999Arkansas[7][8]Tornado outbreak produced 99 tornadoes; killed 9Only High Risk ever issued in January
March 8, 1999Arkansas, LouisianaBusted; few tornadoes with some scattered hail and wind
April 8, 1999Iowa, Missouri, IllinoisTornado outbreak produced 56 tornadoes; killed 6
May 3, 1999Oklahoma, Kansas[9]Tornado outbreak produced 61 tornadoes; killed 48
May 4, 1999Oklahoma, Arkansas, Texas[9]Second day of the same tornado outbreak produced 39 tornadoes; killed 1
May 5, 1999Southern U.S.Third day of the same tornado outbreak produced 18 tornadoes plus a significant serial derecho; killed 3First and only occurrence of three consecutive High Risk days
June 5, 1999South Dakota, Nebraska[10]Busted; isolated tornadoes and scattered wind and hail damageA shortwave ridge maintained a capping inversion. [11]
April 6, 2001Oklahoma, Kansas[12]Serial derecho with widespread wind damage
April 11, 2001Iowa, Illinois, Wisconsin[13]Tornado outbreak produced 40 tornadoes; killed 2[14]
June 11, 2001Minnesota, Wisconsin[15]Progressive derecho with widespread wind damage
October 13, 2001U.S. Gulf Coast[16]Tornado outbreak produced 31 tornadoes
October 24, 2001Midwest[17]Tornado outbreak produced 25 tornadoes plus a major serial derecho; killed 2
April 16, 2002Upper Midwest[18]Busted; isolated wind damage and tornadoes
July 31, 2002Minnesota, Wisconsin[19]Busted; isolated wind damage
November 10, 2002Midwest and Southern U.S.[20]Tornado outbreak produced 76 tornadoes and extensive wind damage; killed 36
December 23, 2002Texas, Louisiana[21]Busted; tornado event produced 15 weak tornadoesOnly High Risk ever issued in December
April 6, 2003Texas, Louisiana, Mississippi[22]Localized tornado event produced 23 tornadoes
May 4, 2003Central U.S.[23]Day 5 of a tornado outbreak sequence produced 86 tornadoes; killed 38
May 5, 2003Southern U.S.[24]Day 6 of a tornado outbreak sequence produced 22 tornadoes but no deaths
May 8, 2003Kansas, Oklahoma[25]Day 9 of a tornado outbreak sequence produced 42 tornadoes but no deaths
May 10, 2003Central U.S.[26]Day 11 of a tornado outbreak sequence produced 60 tornadoes but no deaths
May 15, 2003Texas, Oklahoma[27]Tornado outbreak produced 49 tornadoes
March 4, 2004Texas, Oklahoma[28]Busted; isolated tornadoes outside the risk area reorganized into a large serial derecho
May 22, 2004Nebraska, Iowa[29]Tornado outbreak produced 68 tornadoes; killed 1
May 24, 2004Nebraska, Iowa[30]Hybrid derecho/tornado outbreak produced 54 tornadoes; killed 1
May 29, 2004Central U.S.[31]First day of a two-day tornado outbreak produced 80 tornadoes; killed 3
May 30, 2004Central U.S.[32]Second day of a two-day tornado outbreak produced 86 tornadoes; killed 2
April 11, 2005Louisiana, Mississippi[33]Busted; only isolated wind damage which killed 1
June 4, 2005Central U.S.[34]Tornado outbreak produced 44 tornadoes
November 15, 2005Midwest and Southern U.S.[35]Tornado outbreak produced 50 tornadoes; killed 2
March 12, 2006Midwest[36]Tornado outbreak produced 62 tornadoes; killed 8
April 6, 2006Nebraska, Kansas[37]First day of a three-day tornado outbreak produced 13 tornadoes, but no deaths.
April 7, 2006Southern U.S.[38]Second day of a three-day tornado outbreak produced 49 tornadoes; killed 13Only High Risk to be issued on Day 2 (the day before the event)[39]
March 1, 2007Southern U.S.[40]Tornado outbreak produced 37 tornadoes; killed 20
April 13, 2007Texas[41]Busted; only a few reports of tornadoes and scattered hail damage; killed 1
April 24, 2007Texas[42]Busted; although some tornadoes and wind reports outside the risk area; killed 7
May 5, 2007Nebraska, Kansas[43]Second day of a three-day tornado outbreak produced 84 tornadoes; killed 2
June 7, 2007Upper Midwest[44]Localized tornado event reorganized into a moderate wind event
February 5, 2008Middle Mississippi Valley[45]Tornado outbreak produced 87 tornadoes; killed 57Tied for the deadliest High Risk day
March 15, 2008Georgia, South Carolina[46]Tornado outbreak produced 44 tornadoes; killed 2
May 22, 2008Kansas[47]Day 1 of a tornado outbreak sequence produced 24 tornadoes; killed 1
May 29, 2008Nebraska, Iowa, South Dakota[48]Day 8 of a tornado outbreak sequence produced 42 tornadoes but no deaths
June 5, 2008Midwest[49]Day 3 of a tornado outbreak sequence produced 15 tornadoes (and a large serial derecho) but no deaths

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