Alert archive / North Dakota / Flash Flood Warnings
Flash Flood Warnings in North Dakota, 2010
46 flash flood warnings in 2010. 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 flash flood warnings reaches back to 1986.
Flash Flood Warnings by county
Each county as a circle sized by its count in 2010. Tap one for its archive.
- Flash Flood Warnings
- 46
- Busiest month
- May16 flash flood warnings
- Busiest day
- May 29, 20107 flash flood warnings
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
20 of 46 flash flood warnings covering North Dakota in 2010 had a flash flood report inside them; 25 of 39 flash flood reports fell inside a warning, on average 90 minutes after it went out.
North Dakota, 2010
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Flash flood warnings | 46 | 20 | 57% | 39 | 64% | 90 min |
Each office's whole area, 2010
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Bismarck, ND: flash flood warnings | 29 | 8 | 72% | 23 | 57% | 83 min |
| NWS Grand Forks, ND: flash flood warnings | 29 | 23 | 21% | 39 | 87% | 113 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.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 19, 7:25 PM CDT | Flash Flood Warning | FGF | Grand Forks | 15 hr |
| Mar 21, 9:43 PM CDT | Flash Flood Warning | FGF | Ransom | 13 hr |
| May 22, 1:54 PM CDT | Flash Flood Warning | BIS | Ward | 3 hr |
| May 23, 1:02 AM CDT | Flash Flood Warning | FGF | Grand Forks, Griggs, Nelson, Steele | 5 hr |
| May 24, 1:50 PM CDT | Flash Flood Warning | FGF | Benson, Eddy, Griggs, Nelson, Ramsey | 7 hr |
| May 24, 3:56 PM CDT | Flash Flood Warning | FGF | Barnes | 15 hr |
| May 24, 5:42 PM CDT | Flash Flood Warning | BIS | LaMoure, Stutsman | 4 hr |
| May 27, 9:16 AM CDT | Flash Flood Warning | BIS | McHenry, Ward | 3 hr |
| May 27, 1:33 PM CDT | Flash Flood Warning | BIS | Bottineau, Renville | 3 hr |
| May 29, 2:30 AM CDT | Flash Flood Warning | BIS | Golden Valley, McKenzie | 5 hr |
| May 29, 3:17 AM CDT | Flash Flood Warning | BIS | McKenzie, Williams | 4 hr |
| May 29, 5:41 AM CDT | Flash Flood Warning | BIS | McKenzie, Mountrail | 4 hr |
| May 29, 6:01 AM CDT | Flash Flood Warning | BIS | Bottineau, Renville, Ward | 4 hr |
| May 29, 6:58 AM CDT | Flash Flood Warning | BIS | Renville, Ward | 4 hr |
| May 29, 12:59 PM CDT | Flash Flood Warning | BIS | Bottineau, Mountrail, Renville, Ward | 6 hr |
| May 29, 6:27 PM CDT | Flash Flood Warning | FGF | Pembina | 12 hr |
| May 29, 7:13 PM CDT | Flash Flood Warning | BIS | Renville, Ward | 3 hr |
| May 29, 9:34 PM CDT | Flash Flood Warning | BIS | Logan, McIntosh | 4 hr |
| Jun 17, 12:55 AM CDT | Flash Flood Warning | BIS | Dunn, McKenzie, Mountrail | 6 hr |
| Jun 17, 2:54 AM CDT | Flash Flood Warning | BIS | Adams, Bowman, Grant, Hettinger, Slope, Stark | 6 hr |
| Jun 17, 6:44 AM CDT | Flash Flood Warning | BIS | Morton, Oliver | 5 hr |
| Jun 17, 9:02 AM CDT | Flash Flood Warning | FGF | Eddy, Griggs, Nelson | 13 hr |
| Jun 17, 9:35 AM CDT | Flash Flood Warning | FGF | Cass | 12 hr |
| Jun 17, 4:06 PM CDT | Flash Flood Warning | BIS | McHenry, Ward | 117 min |
| Jun 17, 4:58 PM CDT | Flash Flood Warning | BIS | Ward | 6 hr |
| Jun 21, 12:28 AM CDT | Flash Flood Warning | BIS | Burke, Divide | 5 hr |
| Jun 21, 5:07 AM CDT | Flash Flood Warning | FGF | Benson, Cavalier, Nelson, Ramsey, Towner, Walsh | 9 hr |
| Jun 21, 9:51 AM CDT | Flash Flood Warning | FGF | Pembina | 4 hr |
| Jun 25, 8:57 PM CDT | Flash Flood Warning | BIS | Burke, Renville, Ward | 6 hr |
| Jul 10, 8:49 PM CDT | Flash Flood Warning | BIS | Hettinger | 6 hr |
| Jul 13, 3:29 PM CDT | Flash Flood Warning | BIS | Stutsman | 95 min |
| Jul 13, 4:47 PM CDT | Flash Flood Warning | FGF | Barnes | 6 hr |
| Jul 14, 12:25 AM CDT | Flash Flood Warning | BIS | Adams, Bowman, Grant, Hettinger, Morton, Slope and 1 more | 4 hr |
| Jul 14, 1:49 AM CDT | Flash Flood Warning | BIS | Burleigh, Dickey, Emmons, Grant, Kidder, LaMoure and 6 more | 6 hr |
| Jul 17, 5:32 PM CDT | Flash Flood Warning | FGF | Ransom, Sargent | 3 hr |
| Jul 23, 11:16 PM CDT | Flash Flood Warning | FGF | Cavalier | 10 hr |
| Jul 24, 2:10 AM CDT | Flash Flood Warning | FGF | Pembina | 7 hr |
| Jul 26, 9:32 PM CDT | Flash Flood Warning | BIS | McHenry, Pierce, Sheridan, Wells | 3 hr |
| Aug 7, 12:22 AM CDT | Flash Flood Warning | BIS | McKenzie | 4 hr |
| Aug 10, 4:56 PM CDT | Flash Flood Warning | FGF | Cavalier, Towner | 16 hr |
| Aug 11, 8:33 PM CDT | Flash Flood Warning | BIS | McKenzie | 3 hr |
| Aug 11, 9:02 PM CDT | Flash Flood Warning | BIS | McKenzie | 6 hr |
| Aug 12, 3:11 PM CDT | Flash Flood Warning | FGF | Cass | 16 hr |
| Aug 12, 9:31 PM CDT | Flash Flood Warning | FGF | Ransom | 12 hr |
| Aug 12, 9:38 PM CDT | Flash Flood Warning | BIS | Adams, Bowman | 4 hr |
| Sep 9, 8:14 PM CDT | Flash Flood Warning | BIS | Dunn, Mercer, Oliver | 4 hr |
By county
Every county with at least one alert. A county page lists each alert that covered it.
- Ward County9
- McKenzie County7
- Renville County6
- Nelson County4
- Ransom County3
- Griggs County3
- Stutsman County3
- McHenry County3
- Bottineau County3
- Mountrail County3
- Pembina County3
- Adams County3
- Bowman County3
- Grant County3
- Hettinger County3
- Morton County3
- Oliver County3
- Cavalier County3
- Grand Forks County2
- Benson County2
- Eddy County2
- Ramsey County2
- Barnes County2
- LaMoure County2
- Logan County2
- McIntosh County2
- Dunn County2
- Slope County2
- Stark County2
- Cass County2
- Burke County2
- Towner County2
- Steele County1
- Golden Valley County1
- Williams County1
- Divide County1
- Walsh County1
- Burleigh County1
- Dickey County1
- Emmons County1
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordThe radar archive20092011
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.