Tornado Warnings in North Dakota, 2010

By month

34 of 148 tornado warnings covering North Dakota in 2010 had a tornado report inside them; 65 of 82 tornado reports fell inside a warning, on average 17 minutes after it went out.

North Dakota, 2010

Each office's whole area, 2010

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.

• Walsh County18
• Grand Forks County15
• Morton County14
• Ward County13
• Hettinger County10
• Stark County10
• Emmons County10
• Mountrail County10
• Barnes County9
• Grant County9
• LaMoure County8
• Logan County8
• Ransom County8
• Burke County8
• Sioux County8
• McIntosh County7
• Cass County7
• Traill County7
• Nelson County7
• Billings County7
• Griggs County6
• Steele County6
• Adams County6
• Ramsey County6
• McLean County6
• Richland County6
• Slope County6
• Burleigh County5
• Benson County5
• Renville County5
• Sargent County5
• Dunn County5
• Oliver County4
• Stutsman County4
• Wells County4
• Eddy County4
• Mercer County4
• Sheridan County4
• Pembina County3
• Dickey County3

1. June 17, 201026tornado warnings
2. July 14, 201025tornado warnings
3. June 25, 201013tornado warnings
4. July 27, 201013tornado warnings
5. July 13, 201012tornado warnings
6. May 24, 201011tornado warnings
7. August 13, 201010tornado warnings
8. August 2, 20108tornado warnings
9. September 9, 20107tornado warnings
10. June 21, 20103tornado warnings
11. July 26, 20103tornado warnings
12. May 25, 20102tornado warnings

Alerts in force nowTornadoes on recordThe radar archive20092011

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.