Alert archive / Iowa / Pocahontas County
Weather alerts in Pocahontas County, Iowa, 2021
90 weather alerts in 2021, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Pocahontas County and its neighbors
Each county as a circle sized by its count in 2021. Tap one for its archive.
- Alerts
- 90
- Warnings
- 17
- Watches
- 12
- Advisories
- 33
- Busiest month
- August15 alerts
- Busiest day
- December 15, 20218 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
2 of 5 tornado warnings covering Pocahontas County in 2021 had a tornado report inside them.
Pocahontas County, 2021
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 5 | 2 | 60% | 0 | ||
| Severe thunderstorm warnings | 1 | 1 | 0% | 0 | ||
| Flash flood warnings | 0 | 0 |
Each office's whole area, 2021
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Des Moines, IA: tornado warnings | 48 | 20 | 58% | 54 | 87% | 18 min |
| NWS Des Moines, IA: severe thunderstorm warnings | 133 | 67 | 50% | 273 | 84% | 31 min |
| NWS Des Moines, IA: flash flood warnings | 5 | 5 | 0% | 10 | 100% | 108 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 | Lasted |
|---|---|---|---|
| Jan 1, 10:00 PM CST | Dense Fog Advisory | DMX | 14 hr |
| Jan 2, 2:12 PM CST | Dense Fog Advisory | DMX | 22 hr |
| Jan 3, 2:40 PM CST | Dense Fog Advisory | DMX | 21 hr |
| Jan 13, 3:49 PM CST | Winter Storm Watch | DMX | 12 hr |
| Jan 13, 3:49 PM CST | Winter Weather Advisory | DMX | 50 hr |
| Jan 14, 4:04 AM CST | Blizzard Warning | DMX | 35 hr |
| Jan 19, 2:42 PM CST | Winter Weather Advisory | DMX | 4 hr |
| Jan 22, 2:01 PM CST | Winter Weather Advisory | DMX | 37 hr |
| Jan 25, 4:17 AM CST | Winter Weather Advisory | DMX | 32 hr |
| Jan 29, 2:56 PM CST | Winter Weather Advisory | DMX | 42 hr |
| Feb 2, 1:36 AM CST | Dense Fog Advisory | DMX | 9 hr |
| Feb 2, 8:51 PM CST | Dense Fog Advisory | DMX | 12 hr |
| Feb 3, 3:35 AM CST | Blizzard Warning | DMX | 41 hr |
| Feb 3, 3:35 AM CST | Winter Weather Advisory | DMX | 48 hr |
| Feb 5, 2:42 PM CST | Wind Chill Advisory | DMX | 45 hr |
| Feb 8, 2:22 PM CST | Wind Chill Advisory | DMX | 19 hr |
| Feb 10, 2:44 PM CST | Wind Chill Advisory | DMX | 19 hr |
| Feb 11, 2:56 PM CST | Wind Chill Advisory | DMX | 45 hr |
| Feb 12, 4:04 AM CST | Wind Chill Advisory | DMX | 32 hr |
| Feb 12, 2:59 PM CST | Wind Chill Watch | DMX | 13 hr |
| Feb 13, 3:52 AM CST | Wind Chill Warning | DMX | 3 days |
| Feb 20, 3:32 AM CST | Winter Weather Advisory | DMX | 40 hr |
| Feb 22, 12:47 AM CST | Dense Fog Advisory | DMX | 5 hr |
| Mar 10, 3:55 AM CST | Wind Advisory | DMX | 20 hr |
| Mar 10, 1:32 PM CST | Mesoscale Discussion | SPC | 118 min |
| Mar 13, 3:08 AM CST | Winter Storm Watch | DMX | 24 hr |
| Mar 14, 4:02 AM CDT | Winter Storm Warning | DMX | 36 hr |
| Mar 14, 6:20 PM CDT | Mesoscale Discussion | SPC | 6 hr |
| Mar 15, 1:50 AM CDT | Mesoscale Discussion | SPC | 6 hr |
| Mar 16, 1:06 AM CDT | Dense Fog Advisory | DMX | 8 hr |
| Mar 21, 2:28 AM CDT | Wind Advisory | DMX | 14 hr |
| Mar 28, 4:22 AM CDT | Fire Weather Watch | DMX | 11 hr |
| Mar 28, 2:52 PM CDT | Red Flag Warning | DMX | 29 hr |
| Mar 28, 3:02 PM CDT | Wind Advisory | DMX | 29 hr |
| Apr 2, 10:50 AM CDT | Red Flag Warning | DMX | 9 hr |
| May 1, 3:57 AM CDT | Red Flag Warning | DMX | 15 hr |
| May 10, 2:14 PM CDT | Frost Advisory | DMX | 18 hr |
| May 15, 1:16 PM CDT | Mesoscale Discussion | SPC | 119 min |
| Jun 11, 8:41 AM CDT | Special Weather Statement | DMX | 64 min |
| Jun 11, 9:35 AM CDT | Mesoscale Discussion | SPC | 115 min |
| Jun 16, 3:34 PM CDT | Heat Advisory | DMX | 28 hr |
| Jun 16, 6:26 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 20, 1:10 PM CDT | Mesoscale Discussion | SPC | 95 min |
| Jun 20, 1:42 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 25, 1:00 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 5, 5:44 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 14, 7:02 AM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 14, 7:17 AM CDT | Special Weather Statement | DMX | 58 min |
| Jul 14, 1:40 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 14, 2:35 PM CDT | Tornado Watch | SPC | 8 hr |
| Jul 26, 3:33 AM CDT | Excessive Heat Watch | DMX | 36 hr |
| Jul 27, 3:44 AM CDT | Heat Advisory | DMX | 16 hr |
| Jul 27, 3:04 PM CDT | Heat Advisory | DMX | 52 hr |
| Aug 5, 9:34 PM CDT | Mesoscale Discussion | SPC | 86 min |
| Aug 5, 10:11 PM CDT | Special Weather Statement | DMX | 64 min |
| Aug 8, 5:04 PM CDT | Mesoscale Discussion | SPC | 86 min |
| Aug 8, 8:36 PM CDT | Tornado Warning | DMX | 24 min |
| Aug 8, 9:02 PM CDT | Tornado Warning | DMX | 31 min |
| Aug 20, 3:58 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Aug 20, 6:45 PM CDT | Special Weather Statement | DMX | 45 min |
| Aug 24, 1:52 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Aug 26, 7:37 AM CDT | Mesoscale Discussion | SPC | 83 min |
| Aug 26, 8:03 AM CDT | Special Weather Statement | DMX | 42 min |
| Aug 26, 3:03 PM CDT | Flood Watch | DMX | 16 hr |
| Aug 26, 10:45 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 27, 1:53 PM CDT | Mesoscale Discussion | SPC | 97 min |
| Aug 27, 4:01 PM CDT | Mesoscale Discussion | SPC | 59 min |
| Aug 28, 9:57 PM CDT | Mesoscale Discussion | SPC | 63 min |
| Sep 13, 9:23 PM CDT | Mesoscale Discussion | SPC | 97 min |
| Oct 13, 3:00 AM CDT | Wind Advisory | DMX | 10 hr |
| Oct 15, 1:08 PM CDT | Frost Advisory | DMX | 20 hr |
| Oct 20, 7:39 AM CDT | Mesoscale Discussion | SPC | 96 min |
| Oct 21, 2:49 AM CDT | Freeze Warning | DMX | 30 hr |
| Oct 22, 2:39 PM CDT | Freeze Warning | DMX | 18 hr |
| Nov 11, 2:52 AM CST | Wind Advisory | DMX | 39 hr |
| Nov 13, 5:47 PM CST | Wind Advisory | DMX | 14 hr |
| Dec 5, 2:43 AM CST | Wind Advisory | DMX | 30 hr |
| Dec 8, 3:06 AM CST | Winter Storm Watch | DMX | 33 hr |
| Dec 9, 11:44 AM CST | Winter Storm Warning | DMX | 42 hr |
| Dec 14, 4:09 AM CST | High Wind Warning | DMX | 47 hr |
| Dec 15, 12:28 PM CST | Mesoscale Discussion | SPC | 2 hr |
| Dec 15, 1:23 PM CST | Tornado Watch | SPC | 7 hr |
| Dec 15, 3:55 PM CST | Mesoscale Discussion | SPC | 95 min |
| Dec 15, 5:16 PM CST | Mesoscale Discussion | SPC | 119 min |
| Dec 15, 5:19 PM CST | Severe Thunderstorm Warning | DMX | 71 min |
| Dec 15, 5:36 PM CST | Tornado Warning | DMX | 24 min |
| Dec 15, 5:45 PM CST | Tornado Warning | DMX | 30 min |
| Dec 15, 5:58 PM CST | Tornado Warning | DMX | 32 min |
| Dec 15, 11:52 PM CST | Wind Advisory | DMX | 6 hr |
| Dec 30, 9:07 PM CST | Dense Fog Advisory | DMX | 21 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 archive20202022
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.