National Weather Service United States Department of Commerce

Heavy Rain and Flash Flooding Threat in Montana; Severe Thunderstorms in the Middle Missouri Valley

A low pressure system will bring heavy to excessive rainfall and high winds across Montana this afternoon. Heavy rainfall totals may lead to scattered flash flooding concerns. A line of showers and strong to severe thunderstorms will move into the mid Missouri Valley region this afternoon producing severe winds and isolated large hail with stronger storms. Read More >

SPC
ID #
Date Time
(CST)
Path
Length
(miles)
Path
Width
(yards)
F-Scale Killed Injured County Path
33-1 04/19/1933 1900 15 880   2 25 Grady Agawam - NE of Chickasha
53-39 06/19/1953 1730 6 880 F1 0 0 Grady 5 SW Chickasha - SW edge of Chickasha
55-1 01/05/1955 0500 n/a n/a F0 0 0 Grady Chickasha
55-37 05/26/1955 0230 n/a n/a F1 0 0 Grady Near Chickasha
56-20 04/28/1956 1420 35 n/a F1 0 0 Grady/ McClain/ Cleveland 5 S Chickasha - 3 E Norman
58-6 04/21/1958 1605 n/a n/a F0 0 0 Grady Just S of Chickasha
77-33 05/20/1977 1543 3 90 F1 0 0 Grady Chickaska (near Airport)
81-12 04/30/1981 2015 29 5 F2 1 4 Grady Near Minco - Chickasha - S of Rush Springs (* not continuous track)
83-44 05/13/1983 2245 0.1 50 F1 0 0 Grady 6 N Chickasha
  05/03/1999 1646 9 880 F3 0 4 Caddo/ Grady 2 WSW Laverty - 4 S Verden - 2.5 WNW Downtown Chickasha
  05/03/1999 1707 1 75 F0 0 0 Grady 5 W Downtown Chickasha
  05/03/1999 1712 4 500 F2 0 4 Grady 2.5 NW Downtown Chichasha - Chickasha Airport (NW edge of Chicakasha) - 4 NNE Downtown Chickasha
  05/04/2001 1805 0.2 25 F0 0 0 Grady 0.5 E Chickasha
  05/24/2011 1606 33 880 EF4 1 48 Grady/ McClain/ Cleveland 2 S Chickasha - SW Oklahoma City (near SW 149th and Portland)
 

Records taken from the Storm Prediction Center archive data, "Storm Data", and data from the National Weather Service office in Norman. Data modified as described in NOAA Tech Memo NWS SR-209 (Speheger, D., 2001: "Corrections to the Historic Tornado Database").

Historic data, especially before 1950, are likely incomplete.