Alert archive / North Dakota / Severe Thunderstorm Warnings

Severe Thunderstorm Warnings in North Dakota, 2009

213 severe thunderstorm warnings in 2009. An alert counts here when it covered any part of the state, so the counties below add up to more than the state. The archive of severe thunderstorm warnings reaches back to 1986.

Severe Thunderstorm Warnings by county

Each county as a circle sized by its count in 2009. Tap one for its archive.

Severe Thunderstorm Warnings
213
Busiest month
June79 severe thunderstorm warnings
Busiest day
June 18, 200919 severe thunderstorm warnings

Over time

By month

Warning verification

How often warnings here had a storm report inside them, and how much warning the reports had.

86 of 213 severe thunderstorm warnings covering North Dakota in 2009 had a qualifying storm report inside them; 123 of 187 hail, wind and damage reports fell inside a warning, on average 23 minutes after it went out.

North Dakota, 2009

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Severe thunderstorm warnings2138660%18766%23 min

Each office's whole area, 2009

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
NWS Bismarck, ND: severe thunderstorm warnings1806166%12470%23 min
NWS Grand Forks, ND: severe thunderstorm warnings534123%11560%24 min

An office's figures cover every county it serves, including across state lines.

Verified by the Iowa Environmental Mesonet's Cow, which matches each storm-based warning with the local storm reports inside its polygon while it was in force, within 15 km of its edge: a tornado warning counts as verified on a tornado report, a severe thunderstorm warning on hail of 1 inch or more, a gust of 58 mph or more, or wind damage, a flash flood warning on a flash flood report. The false alarm ratio is the share of warnings with no such report; "inside a warning" is the probability of detection, the share of reports that fell inside one; lead time runs from the warning's issue to each report inside it, counting zero for a report that came first. A warning with no report is not proof nothing happened: reports come from spotters, the public and damage surveys, and are thin where few people live.

The alerts

Every alert, in the order issued. Times are local, Central Time. Each opens its own page with the text, the map, the radar and the sounding.

IssuedProductOfficeCountiesLasted
Mar 22, 9:54 AM CDTSevere Thunderstorm WarningBISBottineau, McHenry, Renville, Rolette, Ward51 min
Mar 22, 10:33 AM CDTSevere Thunderstorm WarningBISEmmons57 min
Mar 22, 10:48 AM CDTSevere Thunderstorm WarningBISBottineau, McHenry, Renville, Rolette, Ward57 min
Mar 22, 11:35 AM CDTSevere Thunderstorm WarningBISBurleigh, Emmons, Kidder, Logan55 min
Mar 22, 11:41 AM CDTSevere Thunderstorm WarningBISBottineau, McHenry64 min
Mar 22, 12:11 PM CDTSevere Thunderstorm WarningBISKidder, LaMoure, Logan, Stutsman19 min
Mar 22, 12:36 PM CDTSevere Thunderstorm WarningBISFoster, LaMoure, Stutsman54 min
Mar 22, 4:24 PM CDTSevere Thunderstorm WarningBISBillings, Golden Valley66 min
Mar 22, 5:42 PM CDTSevere Thunderstorm WarningBISBillings, Dunn29 min
Mar 23, 12:44 PM CDTSevere Thunderstorm WarningBISEmmons32 min
Apr 23, 5:58 PM CDTSevere Thunderstorm WarningBISDickey21 min
May 5, 10:02 PM CDTSevere Thunderstorm WarningBISMcKenzie, Williams58 min
May 11, 4:27 PM CDTSevere Thunderstorm WarningFGFGrand Forks, Walsh34 min
May 12, 4:30 PM CDTSevere Thunderstorm WarningBISMcLean, Mountrail, Ward45 min
May 12, 5:03 PM CDTSevere Thunderstorm WarningBISDunn, Mercer, Stark57 min
May 12, 5:15 PM CDTSevere Thunderstorm WarningBISMcHenry, Ward60 min
May 12, 5:46 PM CDTSevere Thunderstorm WarningBISMcHenry, Ward29 min
May 12, 6:01 PM CDTSevere Thunderstorm WarningBISAdams, Grant, Hettinger, Sioux59 min
May 12, 6:04 PM CDTSevere Thunderstorm WarningBISBottineau41 min
May 12, 6:06 PM CDTSevere Thunderstorm WarningBISGrant, Mercer, Morton, Oliver39 min
May 12, 6:27 PM CDTSevere Thunderstorm WarningBISGrant, Sioux63 min
May 12, 6:48 PM CDTSevere Thunderstorm WarningBISGrant, Morton, Oliver57 min
May 12, 7:03 PM CDTSevere Thunderstorm WarningBISGrant, Morton, Sioux57 min
May 12, 7:09 PM CDTSevere Thunderstorm WarningBISMcHenry66 min
May 12, 7:28 PM CDTSevere Thunderstorm WarningBISBurleigh, Morton47 min
May 12, 7:35 PM CDTSevere Thunderstorm WarningBISBurleigh, Emmons, Morton, Sioux25 min
May 12, 9:30 PM CDTSevere Thunderstorm WarningBISDickey, LaMoure32 min
May 13, 5:15 PM CDTSevere Thunderstorm WarningFGFRichland60 min
May 28, 4:31 PM CDTSevere Thunderstorm WarningBISEmmons44 min
May 28, 5:16 PM CDTSevere Thunderstorm WarningBISEmmons, Logan, McIntosh44 min
Jun 15, 4:58 PM CDTSevere Thunderstorm WarningBISEmmons47 min
Jun 15, 5:43 PM CDTSevere Thunderstorm WarningBISEmmons36 min
Jun 15, 6:07 PM CDTSevere Thunderstorm WarningBISHettinger38 min
Jun 15, 6:10 PM CDTSevere Thunderstorm WarningBISBurleigh50 min
Jun 15, 6:53 PM CDTSevere Thunderstorm WarningBISBurleigh52 min
Jun 15, 8:05 PM CDTSevere Thunderstorm WarningBISMorton55 min
Jun 15, 9:02 PM CDTSevere Thunderstorm WarningBISBurleigh58 min
Jun 17, 3:57 PM CDTSevere Thunderstorm WarningBISMcKenzie48 min
Jun 18, 12:48 PM CDTSevere Thunderstorm WarningBISGrant, Sioux57 min
Jun 18, 1:12 PM CDTSevere Thunderstorm WarningBISLaMoure51 min
Jun 18, 2:23 PM CDTSevere Thunderstorm WarningFGFPembina52 min
Jun 18, 2:25 PM CDTSevere Thunderstorm WarningBISRenville, Ward35 min
Jun 18, 2:55 PM CDTSevere Thunderstorm WarningFGFCavalier65 min
Jun 18, 2:59 PM CDTSevere Thunderstorm WarningBISMcIntosh61 min
Jun 18, 3:16 PM CDTSevere Thunderstorm WarningFGFPembina42 min
Jun 18, 3:23 PM CDTSevere Thunderstorm WarningFGFBarnes, Ransom41 min
Jun 18, 3:41 PM CDTSevere Thunderstorm WarningBISDickey64 min
Jun 18, 3:58 PM CDTSevere Thunderstorm WarningBISDickey, LaMoure, Logan62 min
Jun 18, 4:17 PM CDTSevere Thunderstorm WarningBISDickey, LaMoure58 min
Jun 18, 4:19 PM CDTSevere Thunderstorm WarningFGFCass, Ransom, Richland56 min
Jun 18, 4:26 PM CDTSevere Thunderstorm WarningFGFRansom, Sargent64 min
Jun 18, 4:46 PM CDTSevere Thunderstorm WarningFGFCass, Richland59 min
Jun 18, 4:48 PM CDTSevere Thunderstorm WarningBISBottineau42 min
Jun 18, 4:58 PM CDTSevere Thunderstorm WarningBISWard62 min
Jun 18, 5:02 PM CDTSevere Thunderstorm WarningFGFRansom, Richland, Sargent58 min
Jun 18, 5:56 PM CDTSevere Thunderstorm WarningBISRolette49 min
Jun 18, 6:45 PM CDTSevere Thunderstorm WarningBISBottineau, Rolette51 min
Jun 21, 7:40 PM CDTSevere Thunderstorm WarningBISMountrail, Williams50 min
Jun 22, 3:29 PM CDTSevere Thunderstorm WarningBISDunn, Mercer61 min
Jun 22, 3:34 PM CDTSevere Thunderstorm WarningBISAdams, Bowman56 min
Jun 22, 3:43 PM CDTSevere Thunderstorm WarningBISMcLean, Mercer62 min
Jun 22, 4:18 PM CDTSevere Thunderstorm WarningBISMercer, Oliver42 min
Jun 22, 4:30 PM CDTSevere Thunderstorm WarningBISAdams45 min
Jun 22, 5:00 PM CDTSevere Thunderstorm WarningBISGrant, Sioux60 min
Jun 22, 5:05 PM CDTSevere Thunderstorm WarningBISGrant55 min
Jun 22, 5:28 PM CDTSevere Thunderstorm WarningBISRenville, Ward47 min
Jun 22, 5:30 PM CDTSevere Thunderstorm WarningBISBurleigh, McLean, Oliver, Sheridan60 min
Jun 22, 5:40 PM CDTSevere Thunderstorm WarningBISGrant, Morton65 min
Jun 22, 6:37 PM CDTSevere Thunderstorm WarningBISEmmons, Morton, Sioux38 min
Jun 22, 7:12 PM CDTSevere Thunderstorm WarningBISEmmons48 min
Jun 22, 7:30 PM CDTSevere Thunderstorm WarningBISEmmons, Logan, McIntosh28 min
Jun 24, 8:14 AM CDTSevere Thunderstorm WarningBISHettinger, Slope22 min
Jun 24, 8:21 AM CDTSevere Thunderstorm WarningBISBowman, Slope39 min
Jun 24, 8:45 AM CDTSevere Thunderstorm WarningBISAdams, Hettinger, Slope60 min
Jun 24, 3:54 PM CDTSevere Thunderstorm WarningBISMcKenzie66 min
Jun 24, 4:34 PM CDTSevere Thunderstorm WarningBISBillings, Golden Valley41 min
Jun 24, 5:01 PM CDTSevere Thunderstorm WarningBISDunn, McKenzie59 min
Jun 24, 5:14 PM CDTSevere Thunderstorm WarningBISBillings, Golden Valley, Stark46 min
Jun 24, 5:17 PM CDTSevere Thunderstorm WarningBISBottineau, Renville58 min
Jun 24, 5:59 PM CDTSevere Thunderstorm WarningBISBillings, Hettinger, Slope, Stark46 min
Jun 24, 6:41 PM CDTSevere Thunderstorm WarningBISDunn64 min
Jun 24, 6:44 PM CDTSevere Thunderstorm WarningBISBillings, Hettinger, Slope, Stark46 min
Jun 24, 6:57 PM CDTSevere Thunderstorm WarningBISAdams63 min
Jun 24, 8:26 PM CDTSevere Thunderstorm WarningBISAdams, Grant, Hettinger, Sioux13 min
Jun 25, 9:05 PM CDTSevere Thunderstorm WarningBISMcKenzie, Williams55 min
Jun 26, 1:09 AM CDTSevere Thunderstorm WarningBISMcKenzie, Mountrail, Williams66 min
Jun 26, 12:20 PM CDTSevere Thunderstorm WarningFGFCavalier, Ramsey, Towner40 min
Jun 26, 2:39 PM CDTSevere Thunderstorm WarningBISRolette32 min
Jun 26, 5:00 PM CDTSevere Thunderstorm WarningBISHettinger, Slope, Stark60 min
Jun 26, 5:15 PM CDTSevere Thunderstorm WarningFGFNelson, Walsh60 min
Jun 26, 5:41 PM CDTSevere Thunderstorm WarningBISDunn34 min
Jun 26, 5:47 PM CDTSevere Thunderstorm WarningBISMcLean, Mercer58 min
Jun 26, 6:22 PM CDTSevere Thunderstorm WarningBISDunn, McLean, Mercer53 min
Jun 26, 6:25 PM CDTSevere Thunderstorm WarningFGFGrand Forks, Pembina, Walsh65 min
Jun 26, 7:12 PM CDTSevere Thunderstorm WarningBISGrant, Morton63 min
Jun 26, 7:17 PM CDTSevere Thunderstorm WarningBISMcLean, Mercer58 min
Jun 26, 7:37 PM CDTSevere Thunderstorm WarningBISMcLean38 min
Jun 26, 7:43 PM CDTSevere Thunderstorm WarningBISBurleigh, Grant, Morton62 min
Jun 26, 8:08 PM CDTSevere Thunderstorm WarningBISBurleigh, Emmons, Grant, Kidder, McHenry, McLean and 8 more52 min
Jun 27, 1:24 PM CDTSevere Thunderstorm WarningFGFCavalier, Ramsey, Towner51 min
Jun 27, 2:54 PM CDTSevere Thunderstorm WarningBISMcHenry36 min
Jun 27, 2:58 PM CDTSevere Thunderstorm WarningBISGrant, Morton, Sioux43 min
Jun 27, 3:15 PM CDTSevere Thunderstorm WarningBISRolette50 min
Jun 27, 3:22 PM CDTSevere Thunderstorm WarningFGFRamsey, Towner53 min
Jun 30, 4:47 PM CDTSevere Thunderstorm WarningBISMcKenzie, Williams58 min
Jun 30, 6:08 PM CDTSevere Thunderstorm WarningBISMcKenzie52 min
Jun 30, 6:12 PM CDTSevere Thunderstorm WarningBISGolden Valley, McKenzie47 min
Jun 30, 6:15 PM CDTSevere Thunderstorm WarningBISGolden Valley60 min
Jun 30, 6:28 PM CDTSevere Thunderstorm WarningBISMcKenzie, Williams48 min
Jun 30, 7:07 PM CDTSevere Thunderstorm WarningBISGolden Valley, Slope53 min
Jun 30, 7:48 PM CDTSevere Thunderstorm WarningBISGolden Valley, Slope57 min
Jun 30, 8:44 PM CDTSevere Thunderstorm WarningBISBowman, Slope61 min
Jul 2, 6:17 AM CDTSevere Thunderstorm WarningBISBottineau58 min
Jul 2, 2:26 PM CDTSevere Thunderstorm WarningBISAdams52 min
Jul 2, 5:24 PM CDTSevere Thunderstorm WarningBISMcIntosh36 min
Jul 3, 8:59 PM CDTSevere Thunderstorm WarningBISMcKenzie, Williams61 min
Jul 3, 9:54 PM CDTSevere Thunderstorm WarningBISMcKenzie, Williams66 min
Jul 5, 4:03 PM CDTSevere Thunderstorm WarningBISBillings, Golden Valley, McKenzie42 min
Jul 5, 4:25 PM CDTSevere Thunderstorm WarningBISBillings, Golden Valley50 min
Jul 5, 4:49 PM CDTSevere Thunderstorm WarningBISBillings, Golden Valley, Slope56 min
Jul 5, 5:31 PM CDTSevere Thunderstorm WarningBISBillings, Golden Valley, Slope59 min
Jul 5, 5:47 PM CDTSevere Thunderstorm WarningBISBillings, Dunn, Stark29 min
Jul 6, 4:10 PM CDTSevere Thunderstorm WarningBISMcIntosh38 min
Jul 8, 5:41 PM CDTSevere Thunderstorm WarningBISDivide40 min
Jul 8, 6:19 PM CDTSevere Thunderstorm WarningBISBurke, Divide41 min
Jul 8, 6:19 PM CDTSevere Thunderstorm WarningBISBillings, Golden Valley56 min
Jul 8, 6:28 PM CDTSevere Thunderstorm WarningBISBillings, Golden Valley, McKenzie40 min
Jul 8, 6:56 PM CDTSevere Thunderstorm WarningBISBurke, Divide64 min
Jul 8, 7:01 PM CDTSevere Thunderstorm WarningBISBillings, Golden Valley, McKenzie59 min
Jul 8, 7:19 PM CDTSevere Thunderstorm WarningBISAdams, Billings, Bowman, Dunn, Golden Valley, Slope and 1 more56 min
Jul 8, 7:56 PM CDTSevere Thunderstorm WarningBISAdams, Billings, Bowman, Dunn, Golden Valley, Hettinger and 6 more64 min
Jul 8, 7:56 PM CDTSevere Thunderstorm WarningBISBottineau, Burke, Renville, Ward64 min
Jul 8, 8:26 PM CDTSevere Thunderstorm WarningBISBurke, Divide, Williams64 min
Jul 8, 8:58 PM CDTSevere Thunderstorm WarningBISAdams, Billings, Bowman, Dunn, Golden Valley, Grant and 10 more62 min
Jul 8, 9:16 PM CDTSevere Thunderstorm WarningBISBottineau, Burke, Mountrail, Renville, Ward10 min
Jul 8, 9:54 PM CDTSevere Thunderstorm WarningBISAdams, Dunn, Grant, Hettinger, McLean, Mercer and 4 more66 min
Jul 8, 10:07 PM CDTSevere Thunderstorm WarningBISEmmons, Logan, McIntosh53 min
Jul 8, 10:55 PM CDTSevere Thunderstorm WarningBISBurleigh, Emmons, McLean, Mercer, Morton, Oliver and 1 more65 min
Jul 8, 10:58 PM CDTSevere Thunderstorm WarningBISAdams, Emmons, Grant, Hettinger, Morton, Sioux and 1 more62 min
Jul 9, 1:09 AM CDTSevere Thunderstorm WarningBISBurleigh, Kidder66 min
Jul 11, 6:45 PM CDTSevere Thunderstorm WarningBISDunn, Stark60 min
Jul 11, 8:13 PM CDTSevere Thunderstorm WarningBISGrant, Hettinger62 min
Jul 11, 8:38 PM CDTSevere Thunderstorm WarningBISBurke, Divide, Mountrail52 min
Jul 11, 10:44 PM CDTSevere Thunderstorm WarningBISMcLean, Mountrail, Ward20 min
Jul 11, 11:12 PM CDTSevere Thunderstorm WarningBISMcLean, Mercer63 min
Jul 11, 11:48 PM CDTSevere Thunderstorm WarningBISMcLean, Mercer, Oliver57 min
Jul 12, 12:29 AM CDTSevere Thunderstorm WarningBISBurleigh, McLean, Mercer, Morton, Oliver, Sheridan38 min
Jul 12, 1:49 AM CDTSevere Thunderstorm WarningBISBurleigh, Emmons, Kidder, Logan, McIntosh, Morton and 1 more56 min
Jul 12, 2:41 AM CDTSevere Thunderstorm WarningBISDickey, Emmons, Kidder, LaMoure, Logan, McIntosh64 min
Jul 13, 6:08 AM CDTSevere Thunderstorm WarningBISAdams67 min
Jul 13, 7:09 AM CDTSevere Thunderstorm WarningBISAdams, Grant, Sioux51 min
Jul 13, 10:21 AM CDTSevere Thunderstorm WarningBISGrant, Sioux34 min
Jul 19, 6:42 PM CDTSevere Thunderstorm WarningBISAdams, Bowman63 min
Jul 19, 7:09 PM CDTSevere Thunderstorm WarningBISDunn66 min
Jul 19, 7:44 PM CDTSevere Thunderstorm WarningBISDunn, McLean, Mercer61 min
Jul 19, 8:17 PM CDTSevere Thunderstorm WarningBISDunn, Mercer58 min
Jul 19, 11:44 PM CDTSevere Thunderstorm WarningBISMcHenry, Pierce44 min
Jul 19, 11:59 PM CDTSevere Thunderstorm WarningFGFTowner61 min
Jul 20, 12:08 AM CDTSevere Thunderstorm WarningFGFBenson67 min
Jul 20, 12:27 AM CDTSevere Thunderstorm WarningFGFBenson, Towner63 min
Jul 20, 12:43 AM CDTSevere Thunderstorm WarningFGFBenson, Ramsey, Towner62 min
Jul 20, 1:10 AM CDTSevere Thunderstorm WarningFGFCavalier65 min
Jul 20, 2:14 AM CDTSevere Thunderstorm WarningFGFCavalier46 min
Jul 20, 6:09 AM CDTSevere Thunderstorm WarningFGFCass, Traill47 min
Jul 20, 1:12 PM CDTSevere Thunderstorm WarningFGFCass, Ransom48 min
Jul 23, 4:29 PM CDTSevere Thunderstorm WarningBISBurleigh, McLean, Sheridan61 min
Jul 23, 6:10 PM CDTSevere Thunderstorm WarningBISKidder44 min
Jul 23, 8:11 PM CDTSevere Thunderstorm WarningFGFPembina, Walsh64 min
Jul 23, 8:46 PM CDTSevere Thunderstorm WarningFGFGrand Forks, Steele, Traill59 min
Aug 7, 10:57 PM CDTSevere Thunderstorm WarningBISBowman63 min
Aug 7, 11:57 PM CDTSevere Thunderstorm WarningBISAdams, Bowman48 min
Aug 14, 12:32 AM CDTSevere Thunderstorm WarningBISDunn, McKenzie, Mountrail58 min
Aug 14, 1:31 AM CDTSevere Thunderstorm WarningBISDunn, McKenzie, McLean, Mountrail59 min
Aug 14, 1:54 AM CDTSevere Thunderstorm WarningBISDunn, McKenzie, McLean, Mountrail51 min
Aug 14, 2:59 AM CDTSevere Thunderstorm WarningBISWard61 min
Aug 14, 3:35 AM CDTSevere Thunderstorm WarningBISBottineau, McHenry, Renville55 min
Aug 14, 3:42 AM CDTSevere Thunderstorm WarningBISDunn, McKenzie, Mountrail48 min
Aug 14, 4:07 AM CDTSevere Thunderstorm WarningBISBottineau, Rolette33 min
Aug 14, 4:30 AM CDTSevere Thunderstorm WarningBISMcLean, Mountrail, Ward45 min
Aug 14, 5:16 AM CDTSevere Thunderstorm WarningBISMcLean, Mercer41 min
Aug 14, 6:29 AM CDTSevere Thunderstorm WarningBISMcHenry, Pierce, Sheridan, Wells46 min
Aug 14, 6:47 AM CDTSevere Thunderstorm WarningFGFBenson58 min
Aug 14, 7:30 AM CDTSevere Thunderstorm WarningFGFBenson, Eddy, Ramsey60 min
Aug 14, 8:14 AM CDTSevere Thunderstorm WarningFGFBenson, Cavalier, Nelson, Ramsey, Walsh61 min
Aug 14, 8:20 AM CDTSevere Thunderstorm WarningFGFGrand Forks, Nelson55 min
Aug 14, 8:53 AM CDTSevere Thunderstorm WarningFGFGrand Forks, Nelson, Steele, Traill, Walsh52 min
Aug 14, 9:39 AM CDTSevere Thunderstorm WarningFGFGrand Forks66 min
Aug 14, 4:58 PM CDTSevere Thunderstorm WarningBISDickey, McIntosh62 min
Aug 14, 5:43 PM CDTSevere Thunderstorm WarningBISKidder, Stutsman62 min
Aug 14, 6:17 PM CDTSevere Thunderstorm WarningBISKidder, Stutsman58 min
Aug 14, 7:11 PM CDTSevere Thunderstorm WarningFGFRansom, Sargent36 min
Aug 23, 11:30 PM CDTSevere Thunderstorm WarningBISMcKenzie, Williams60 min
Aug 24, 12:08 AM CDTSevere Thunderstorm WarningBISMcKenzie52 min
Aug 24, 12:29 AM CDTSevere Thunderstorm WarningBISMcKenzie, Williams61 min
Aug 24, 12:58 AM CDTSevere Thunderstorm WarningBISMcKenzie32 min
Aug 24, 1:15 AM CDTSevere Thunderstorm WarningBISBurke, Divide, McKenzie, Mountrail, Williams60 min
Aug 24, 2:15 AM CDTSevere Thunderstorm WarningBISBurke, Mountrail, Renville, Ward60 min
Aug 24, 5:22 AM CDTSevere Thunderstorm WarningFGFCavalier, Towner53 min
Sep 8, 12:55 AM CDTSevere Thunderstorm WarningBISBowman, Slope50 min
Sep 8, 1:34 AM CDTSevere Thunderstorm WarningBISAdams, Bowman, Hettinger, Slope41 min
Sep 8, 2:14 AM CDTSevere Thunderstorm WarningBISDunn, Stark46 min
Sep 8, 2:38 AM CDTSevere Thunderstorm WarningBISDunn, Grant, Mercer, Morton, Oliver, Stark67 min
Sep 8, 3:23 AM CDTSevere Thunderstorm WarningBISMorton, Oliver37 min
Sep 8, 4:09 AM CDTSevere Thunderstorm WarningBISMcHenry, McLean, Sheridan, Ward51 min
Sep 10, 7:46 PM CDTSevere Thunderstorm WarningBISMcLean, Ward44 min
Sep 10, 8:28 PM CDTSevere Thunderstorm WarningBISMcLean62 min
Sep 10, 9:06 PM CDTSevere Thunderstorm WarningBISMcLean, Sheridan39 min
Sep 10, 9:19 PM CDTSevere Thunderstorm WarningBISBurleigh, McLean, Oliver56 min
Sep 10, 9:26 PM CDTSevere Thunderstorm WarningBISMorton, Oliver54 min
Sep 10, 10:12 PM CDTSevere Thunderstorm WarningBISBurleigh, McLean, Oliver, Sheridan63 min
Sep 10, 10:26 PM CDTSevere Thunderstorm WarningBISBurleigh, Morton64 min
Sep 10, 10:50 PM CDTSevere Thunderstorm WarningBISBurleigh, Sheridan, Wells42 min
Sep 10, 11:00 PM CDTSevere Thunderstorm WarningBISGrant, Sioux60 min

By county

Every county with at least one alert. A county page lists each alert that covered it.

12 more counties

The busiest days

Days with the most alerts issued, by UTC date.

Nearby

Alerts in force nowTornadoes on recordThe radar archive20082010

Sources

National Weather Service watches, warnings, advisories and statements from the Iowa Environmental Mesonet's VTEC archive, which reconstructs tornado, severe thunderstorm, flash flood and marine warnings back to 1986 from the NWS text archive. Storm Prediction Center watches and mesoscale discussions from SPC's archive through the Mesonet. County centers from the US Census Bureau. Warning verification from the Mesonet's Cow. Rebuilt daily.