Alert archive / Iowa / Black Hawk County
Weather alerts in Black Hawk County, Iowa, 2026
140 weather alerts in 2026, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Black Hawk County and its neighbors
Each county as a circle sized by its count in 2026. Tap one for its archive.
- Alerts
- 140
- Warnings
- 39
- Watches
- 38
- Advisories
- 24
- Busiest month
- July39 alerts
- Busiest day
- July 2, 202612 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
0 of 3 tornado warnings covering Black Hawk County in 2026 had a tornado report inside them.
Black Hawk County, 2026
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 3 | 0 | 100% | 0 | ||
| Severe thunderstorm warnings | 18 | 13 | 28% | 21 | 90% | 25 min |
| Flash flood warnings | 1 | 1 | 0% | 0 |
Each office's whole area, 2026
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Des Moines, IA: tornado warnings | 78 | 21 | 73% | 32 | 81% | 21 min |
| NWS Des Moines, IA: severe thunderstorm warnings | 343 | 160 | 53% | 469 | 84% | 23 min |
| NWS Des Moines, IA: flash flood warnings | 31 | 11 | 65% | 25 | 76% | 92 min |
An office's figures cover every county it serves, including across state lines.
The year is still running; reports filed late and damage surveys can still change these figures.
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 | Lasted |
|---|---|---|---|
| Jan 5, 8:25 PM CST | Dense Fog Advisory | DMX | 19 hr |
| Jan 6, 9:38 PM CST | Dense Fog Advisory | DMX | 11 hr |
| Jan 15, 2:01 PM CST | Winter Weather Advisory | DMX | 31 hr |
| Jan 17, 2:07 PM CST | Cold Weather Advisory | DMX | 46 hr |
| Jan 17, 2:07 PM CST | Winter Weather Advisory | DMX | 34 hr |
| Jan 20, 2:42 AM CST | Winter Weather Advisory | DMX | 23 hr |
| Jan 20, 2:30 PM CST | Extreme Cold Watch | DMX | 45 hr |
| Jan 21, 2:29 AM CST | Winter Weather Advisory | DMX | 18 hr |
| Jan 21, 10:26 AM CST | Blizzard Warning | DMX | 9 hr |
| Jan 22, 2:28 AM CST | Extreme Cold Warning | DMX | 34 hr |
| Jan 22, 11:08 AM CST | Cold Weather Advisory | DMX | 40 hr |
| Jan 25, 2:04 AM CST | Cold Weather Advisory | DMX | 31 hr |
| Feb 17, 2:31 PM CST | Wind Advisory | DMX | 27 hr |
| Feb 17, 2:41 PM CST | Fire Weather Watch | DMX | 6 hr |
| Feb 17, 8:15 PM CST | Red Flag Warning | DMX | 23 hr |
| Feb 18, 2:43 PM CST | Winter Weather Advisory | DMX | 42 hr |
| Feb 19, 10:45 AM CST | Winter Storm Warning | DMX | 22 hr |
| Feb 19, 6:07 PM CST | Mesoscale Discussion | SPC | 6 hr |
| Mar 3, 11:38 PM CST | Dense Fog Advisory | DMX | 10 hr |
| Mar 6, 8:18 PM CST | Tornado Watch | SPC | 6 hr |
| Mar 6, 9:43 PM CST | Mesoscale Discussion | SPC | 2 hr |
| Mar 11, 11:23 AM CDT | High Wind Watch | DMX | 10 hr |
| Mar 11, 9:33 PM CDT | High Wind Warning | DMX | 35 hr |
| Mar 12, 10:04 AM CDT | Wind Advisory | DMX | 26 hr |
| Mar 12, 2:20 PM CDT | Winter Storm Watch | DMX | 45 hr |
| Mar 14, 3:09 AM CDT | High Wind Watch | DMX | 8 hr |
| Mar 14, 11:34 AM CDT | Blizzard Warning | DMX | 43 hr |
| Mar 14, 11:37 AM CDT | High Wind Warning | DMX | 40 hr |
| Mar 16, 5:37 AM CDT | Winter Weather Advisory | DMX | 4 hr |
| Mar 26, 1:42 PM CDT | Fire Weather Watch | DMX | 22 hr |
| Mar 27, 11:52 AM CDT | Red Flag Warning | DMX | 33 hr |
| Mar 30, 8:57 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Mar 30, 11:29 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Apr 4, 11:38 AM CDT | River Flood Watch | DMX | 10 hr |
| Apr 4, 9:36 PM CDT | River Flood Warning | DMX | 70 hr |
| Apr 8, 1:56 AM CDT | Wind Advisory | DMX | 16 hr |
| Apr 14, 12:56 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Apr 14, 2:33 PM CDT | Tornado Watch | SPC | 9 hr |
| Apr 14, 3:40 PM CDT | Severe Thunderstorm Warning | DMX | 37 min |
| Apr 14, 3:42 PM CDT | Mesoscale Discussion | SPC | 93 min |
| Apr 14, 4:00 PM CDT | Severe Thunderstorm Warning | DMX | 45 min |
| Apr 14, 4:44 PM CDT | Severe Thunderstorm Warning | DMX | 16 min |
| Apr 14, 5:32 PM CDT | Severe Thunderstorm Warning | DMX | 28 min |
| Apr 15, 10:22 AM CDT | Mesoscale Discussion | SPC | 2 hr |
| Apr 15, 12:28 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Apr 15, 4:26 PM CDT | Severe Thunderstorm Warning | DMX | 19 min |
| Apr 17, 11:48 AM CDT | Mesoscale Discussion | SPC | 2 hr |
| Apr 17, 12:40 PM CDT | Tornado Watch | SPC | 9 hr |
| Apr 17, 2:38 PM CDT | Tornado Warning | DMX | 30 min |
| Apr 17, 2:49 PM CDT | Mesoscale Discussion | SPC | 116 min |
| Apr 19, 2:13 AM CDT | Freeze Warning | DMX | 31 hr |
| Apr 23, 5:56 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Apr 23, 7:41 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Apr 27, 12:52 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| May 1, 2:34 AM CDT | Frost Advisory | DMX | 29 hr |
| May 10, 11:57 AM CDT | Frost Advisory | DMX | 20 hr |
| May 15, 3:55 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| May 15, 5:16 PM CDT | Severe Thunderstorm Watch | SPC | 8 hr |
| May 15, 7:29 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| May 15, 9:07 PM CDT | Mesoscale Discussion | SPC | 113 min |
| May 15, 10:14 PM CDT | Severe Thunderstorm Warning | DMX | 46 min |
| May 15, 10:53 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| May 17, 8:07 PM CDT | Tornado Watch | SPC | 5 hr |
| May 17, 10:32 PM CDT | Mesoscale Discussion | SPC | 118 min |
| Jun 4, 3:54 AM CDT | Flood Watch | DMX | 27 hr |
| Jun 10, 11:08 AM CDT | Severe Thunderstorm Warning | DMX | 52 min |
| Jun 10, 11:09 AM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 10, 11:33 AM CDT | Severe Thunderstorm Warning | DMX | 27 min |
| Jun 10, 11:58 AM CDT | Severe Thunderstorm Warning | DMX | 15 min |
| Jun 11, 2:13 AM CDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jun 11, 8:25 AM CDT | Severe Thunderstorm Warning | DMX | 65 min |
| Jun 11, 8:38 AM CDT | Severe Thunderstorm Warning | DMX | 67 min |
| Jun 11, 10:05 AM CDT | High Wind Warning | DMX | 55 min |
| Jun 17, 2:36 AM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 17, 3:55 AM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 17, 5:42 AM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 22, 2:21 AM CDT | Dense Fog Advisory | DMX | 5 hr |
| Jun 27, 1:18 AM CDT | Extreme Heat Watch | DMX | 24 hr |
| Jun 27, 12:50 PM CDT | Extreme Heat Warning | DMX | 6 days |
| Jun 28, 7:34 AM CDT | Mesoscale Discussion | SPC | 116 min |
| Jun 28, 10:14 AM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 1, 2:34 PM CDT | Mesoscale Discussion | SPC | 116 min |
| Jul 2, 11:05 AM CDT | Mesoscale Discussion | SPC | 85 min |
| Jul 2, 12:45 PM CDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jul 2, 1:05 PM CDT | Flood Watch | DMX | 42 hr |
| Jul 2, 1:10 PM CDT | Mesoscale Discussion | SPC | 95 min |
| Jul 2, 1:29 PM CDT | Severe Thunderstorm Warning | DMX | 46 min |
| Jul 2, 2:19 PM CDT | River Flood Watch | DMX | 59 hr |
| Jul 2, 2:19 PM CDT | River Flood Watch | DMX | 5 days |
| Jul 2, 2:19 PM CDT | River Flood Watch | DMX | 4 days |
| Jul 2, 2:21 PM CDT | River Flood Watch | DMX | 21 days |
| Jul 2, 3:53 PM CDT | Mesoscale Discussion | SPC | 97 min |
| Jul 2, 5:42 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 2, 6:58 PM CDT | Flash Flood Warning | DMX | 6 hr |
| Jul 3, 3:52 AM CDT | River Flood Watch | DMX | 22 hr |
| Jul 4, 1:27 AM CDT | River Flood Warning | DMX | 42 hr |
| Jul 8, 2:09 PM CDT | Flood Watch | DMX | 13 hr |
| Jul 8, 6:21 PM CDT | Mesoscale Discussion | SPC | 114 min |
| Jul 8, 9:03 PM CDT | River Flood Watch | DMX | 3 days |
| Jul 8, 9:03 PM CDT | River Flood Watch | DMX | 43 hr |
| Jul 8, 9:03 PM CDT | River Flood Watch | DMX | 47 hr |
| Jul 8, 9:15 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 9, 7:39 AM CDT | River Flood Watch | DMX | 21 days |
| Jul 9, 9:55 PM CDT | River Flood Warning | DMX | 27 hr |
| Jul 10, 4:15 PM CDT | River Flood Warning | DMX | 3 days |
| Jul 12, 9:53 AM CDT | River Flood Watch | DMX | 3 hr |
| Jul 12, 12:45 PM CDT | River Flood Warning | DMX | 19 hr |
| Jul 19, 12:53 PM CDT | Heat Advisory | DMX | 31 hr |
| Jul 20, 7:55 AM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 20, 2:48 PM CDT | Mesoscale Discussion | SPC | 117 min |
| Jul 20, 3:03 PM CDT | Tornado Watch | SPC | 7 hr |
| Jul 20, 3:24 PM CDT | Severe Thunderstorm Warning | DMX | 66 min |
| Jul 20, 3:56 PM CDT | Severe Thunderstorm Warning | DMX | 64 min |
| Jul 20, 3:57 PM CDT | Tornado Warning | DMX | 48 min |
| Jul 20, 4:13 PM CDT | Severe Thunderstorm Warning | DMX | 37 min |
| Jul 20, 4:34 PM CDT | Mesoscale Discussion | SPC | 116 min |
| Jul 24, 2:27 AM CDT | Extreme Heat Watch | DMX | 57 hr |
| Jul 25, 2:53 AM CDT | Extreme Heat Warning | DMX | 67 hr |
| Jul 26, 3:54 PM CDT | Mesoscale Discussion | SPC | 96 min |
| Jul 26, 4:59 PM CDT | Severe Thunderstorm Warning | DMX | 46 min |
| Aug 6, 12:43 AM CDT | Dense Fog Advisory | DMX | 9 hr |
| Aug 7, 2:52 AM CDT | Dense Fog Advisory | DMX | 6 hr |
| Aug 7, 1:40 PM CDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Aug 7, 3:49 PM CDT | Severe Thunderstorm Warning | DMX | 26 min |
| Aug 7, 3:53 PM CDT | Tornado Warning | DMX | 22 min |
| Aug 7, 4:16 PM CDT | Severe Thunderstorm Warning | DMX | 59 min |
| Aug 7, 4:57 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 10, 9:07 PM CDT | Mesoscale Discussion | SPC | 113 min |
| Aug 11, 4:13 AM CDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 13, 2:53 AM CDT | Flood Watch | DMX | 55 hr |
| Aug 18, 1:52 PM CDT | Mesoscale Discussion | SPC | 113 min |
| Aug 18, 6:48 PM CDT | Severe Thunderstorm Watch | SPC | 114 min |
| Aug 30, 1:32 PM CDT | Heat Advisory | DMX | 6 days |
| Sep 1, 3:57 AM CDT | Dense Fog Advisory | DMX | 4 hr |
| Sep 4, 2:10 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Sep 8, 2:49 PM CDT | Mesoscale Discussion | SPC | 116 min |
| Sep 13, 8:19 PM CDT | Flood Watch | DMX | 3 days |
| Sep 14, 9:11 PM CDT | Mesoscale Discussion | SPC | 64 min |
| Sep 16, 8:20 PM CDT | Dense Fog Advisory | DMX | 14 hr |
| Sep 18, 1:22 PM CDT | Flood Watch | DMX | 22 hr |
By product
Every kind of product issued here, grouped by hazard. Each opens the same place narrowed to that product.
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive2025
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.