Alert archive / Pennsylvania / Lancaster County
Weather alerts in Lancaster County, Pennsylvania, 2010
236 weather alerts in 2010, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Lancaster County and its neighbors
Each county as a circle sized by its count in 2010. Tap one for its archive.
- Alerts
- 236
- Warnings
- 78
- Watches
- 34
- Advisories
- 40
- Busiest month
- June43 alerts
- Busiest day
- September 30, 201014 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 Lancaster County in 2010 had a tornado report inside them; 0 of 1 tornado reports fell inside a warning.
Lancaster County, 2010
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 3 | 0 | 100% | 1 | 0% | |
| Severe thunderstorm warnings | 47 | 34 | 28% | 49 | 80% | 26 min |
| Flash flood warnings | 7 | 5 | 29% | 4 | 100% | 67 min |
Each office's whole area, 2010
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS State College, PA: tornado warnings | 17 | 2 | 88% | 6 | 50% | 25 min |
| NWS State College, PA: severe thunderstorm warnings | 213 | 131 | 38% | 319 | 85% | 27 min |
| NWS State College, PA: flash flood warnings | 22 | 9 | 59% | 24 | 71% | 72 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, Eastern Time. Each opens its own page with the text, the map, the radar and the sounding.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Jan 2, 3:16 PM EST | Wind Advisory | CTP | 28 hr |
| Jan 4, 2:24 PM EST | Special Weather Statement | CTP | 21 min |
| Jan 16, 2:48 PM EST | Freezing Rain Advisory | CTP | 14 hr |
| Jan 23, 2:56 PM EST | Flood Watch | CTP | 48 hr |
| Jan 24, 9:23 PM EST | Wind Advisory | CTP | 15 hr |
| Jan 25, 6:20 AM EST | Areal Flood Warning | CTP | 6 hr |
| Jan 25, 8:48 AM EST | Special Weather Statement | CTP | 87 min |
| Jan 25, 12:17 PM EST | Areal Flood Warning | CTP | 14 hr |
| Jan 25, 9:26 PM EST | River Flood Warning | CTP | 36 hr |
| Jan 25, 9:26 PM EST | River Flood Warning | CTP | 48 hr |
| Jan 30, 4:30 PM EST | Special Weather Statement | CTP | 75 min |
| Feb 2, 2:20 PM EST | Winter Weather Advisory | CTP | 13 hr |
| Feb 4, 3:20 AM EST | Winter Storm Watch | CTP | 12 hr |
| Feb 4, 3:09 PM EST | Winter Storm Warning | CTP | 46 hr |
| Feb 5, 6:58 PM EST | Mesoscale Discussion | SPC | 4 hr |
| Feb 7, 9:31 PM EST | Winter Storm Watch | CTP | 30 hr |
| Feb 8, 3:56 PM EST | Winter Storm Warning | CTP | 54 hr |
| Feb 10, 7:27 AM EST | Mesoscale Discussion | SPC | 5 hr |
| Feb 10, 9:41 AM EST | Blizzard Warning | CTP | 15 hr |
| Feb 10, 12:20 PM EST | Mesoscale Discussion | SPC | 4 hr |
| Feb 15, 4:05 AM EST | Winter Weather Advisory | CTP | 31 hr |
| Feb 23, 8:21 PM EST | Winter Storm Watch | CTP | 29 hr |
| Feb 24, 3:15 PM EST | Winter Weather Advisory | CTP | 48 hr |
| Feb 25, 10:33 AM EST | High Wind Watch | CTP | 4 hr |
| Feb 25, 2:47 PM EST | Wind Advisory | CTP | 24 hr |
| Mar 10, 4:24 AM EST | Flood Watch | CTP | 4 days |
| Mar 13, 10:09 AM EST | Wind Advisory | CTP | 12 hr |
| Mar 13, 4:07 PM EST | Areal Flood Warning | CTP | 8 hr |
| Mar 28, 2:19 PM EDT | Flood Watch | CTP | 12 hr |
| Apr 7, 3:43 AM EDT | Red Flag Warning | CTP | 15 hr |
| Apr 8, 4:48 PM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Apr 13, 2:52 PM EDT | Frost Advisory | CTP | 17 hr |
| Apr 14, 2:00 AM EDT | Dense Fog Advisory | CTP | 8 hr |
| Apr 16, 1:28 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Apr 16, 6:06 PM EDT | Severe Thunderstorm Warning | CTP | 69 min |
| Apr 16, 6:14 PM EDT | Mesoscale Discussion | SPC | 61 min |
| Apr 16, 6:49 PM EDT | Severe Thunderstorm Warning | CTP | 56 min |
| Apr 19, 2:33 PM EDT | Frost Advisory | CTP | 17 hr |
| Apr 22, 4:33 AM EDT | Dense Fog Advisory | CTP | 4 hr |
| Apr 27, 2:23 PM EDT | Frost Advisory | CTP | 15 hr |
| Apr 28, 2:36 PM EDT | Fire Weather Watch | CTP | 15 hr |
| Apr 29, 5:22 AM EDT | Red Flag Warning | CTP | 15 hr |
| Apr 30, 8:09 PM EDT | Areal Flood Warning | CTP | 31 days |
| May 2, 5:58 PM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
| May 2, 8:27 PM EDT | Mesoscale Discussion | SPC | 63 min |
| May 2, 10:47 PM EDT | Special Weather Statement | CTP | 88 min |
| May 2, 11:05 PM EDT | Severe Thunderstorm Warning | CTP | 25 min |
| May 2, 11:32 PM EDT | Special Weather Statement | CTP | 28 min |
| May 3, 12:42 AM EDT | Flash Flood Watch | CTP | 4 hr |
| May 3, 6:14 AM EDT | Areal Flood Advisory | CTP | 3 hr |
| May 7, 3:41 PM EDT | Wind Advisory | CTP | 31 hr |
| May 9, 12:48 PM EDT | Frost Advisory | CTP | 19 hr |
| May 14, 2:29 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| May 14, 5:41 PM EDT | Severe Thunderstorm Warning | CTP | 64 min |
| May 14, 6:00 PM EDT | Severe Thunderstorm Warning | CTP | 75 min |
| May 14, 6:35 PM EDT | Mesoscale Discussion | SPC | 55 min |
| May 14, 7:26 PM EDT | Areal Flood Advisory | CTP | 2 hr |
| May 27, 11:28 AM EDT | Mesoscale Discussion | SPC | 92 min |
| May 27, 1:23 PM EDT | Severe Thunderstorm Watch | SPC | 8 hr |
| May 27, 4:13 PM EDT | Mesoscale Discussion | SPC | 62 min |
| May 27, 8:08 PM EDT | Mesoscale Discussion | SPC | 97 min |
| May 27, 9:24 PM EDT | Severe Thunderstorm Warning | CTP | 36 min |
| May 27, 10:03 PM EDT | Severe Thunderstorm Warning | CTP | 27 min |
| May 27, 10:34 PM EDT | Severe Thunderstorm Warning | CTP | 26 min |
| May 27, 11:54 PM EDT | Special Weather Statement | CTP | 66 min |
| May 31, 2:59 PM EDT | Special Weather Statement | CTP | 46 min |
| May 31, 4:07 PM EDT | Severe Thunderstorm Warning | CTP | 53 min |
| May 31, 4:35 PM EDT | Areal Flood Advisory | CTP | 3 hr |
| May 31, 4:39 PM EDT | Severe Thunderstorm Warning | CTP | 66 min |
| May 31, 4:47 PM EDT | Areal Flood Advisory | CTP | 3 hr |
| May 31, 4:58 PM EDT | Severe Thunderstorm Warning | CTP | 62 min |
| May 31, 5:02 PM EDT | Severe Thunderstorm Warning | CTP | 58 min |
| May 31, 5:11 PM EDT | Flash Flood Warning | CTP | 3 hr |
| May 31, 5:44 PM EDT | Severe Thunderstorm Warning | CTP | 61 min |
| May 31, 5:48 PM EDT | Flash Flood Warning | CTP | 3 hr |
| May 31, 5:59 PM EDT | Severe Thunderstorm Warning | CTP | 76 min |
| May 31, 6:46 PM EDT | Severe Thunderstorm Warning | CTP | 59 min |
| Jun 3, 11:27 AM EDT | Mesoscale Discussion | SPC | 93 min |
| Jun 3, 1:32 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 3, 3:36 PM EDT | Mesoscale Discussion | SPC | 54 min |
| Jun 3, 6:28 PM EDT | Mesoscale Discussion | SPC | 62 min |
| Jun 3, 7:42 PM EDT | Areal Flood Advisory | CTP | 3 hr |
| Jun 3, 7:49 PM EDT | Severe Thunderstorm Warning | CTP | 56 min |
| Jun 3, 8:18 PM EDT | Special Weather Statement | CTP | 57 min |
| Jun 3, 8:32 PM EDT | Severe Thunderstorm Warning | CTP | 58 min |
| Jun 4, 1:09 PM EDT | Mesoscale Discussion | SPC | 66 min |
| Jun 4, 2:39 PM EDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jun 4, 2:50 PM EDT | Special Weather Statement | CTP | 25 min |
| Jun 4, 3:17 PM EDT | Severe Thunderstorm Warning | CTP | 42 min |
| Jun 4, 4:24 PM EDT | Mesoscale Discussion | SPC | 66 min |
| Jun 4, 5:35 PM EDT | Special Weather Statement | CTP | 25 min |
| Jun 4, 6:02 PM EDT | Special Weather Statement | CTP | 13 min |
| Jun 4, 6:13 PM EDT | Special Weather Statement | CTP | 62 min |
| Jun 4, 7:03 PM EDT | Mesoscale Discussion | SPC | 57 min |
| Jun 4, 9:52 PM EDT | Severe Thunderstorm Warning | CTP | 53 min |
| Jun 4, 10:32 PM EDT | Special Weather Statement | CTP | 58 min |
| Jun 6, 10:25 AM EDT | Mesoscale Discussion | SPC | 65 min |
| Jun 6, 11:08 AM EDT | Tornado Watch | SPC | 8 hr |
| Jun 6, 2:44 PM EDT | Special Weather Statement | CTP | 16 min |
| Jun 10, 12:26 AM EDT | Dense Fog Advisory | CTP | 7 hr |
| Jun 13, 12:58 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 16, 10:28 PM EDT | Special Weather Statement | CTP | 47 min |
| Jun 16, 11:11 PM EDT | Special Weather Statement | CTP | 49 min |
| Jun 22, 11:35 AM EDT | Mesoscale Discussion | SPC | 25 min |
| Jun 22, 3:48 PM EDT | Mesoscale Discussion | SPC | 27 min |
| Jun 22, 4:19 PM EDT | Special Weather Statement | CTP | 56 min |
| Jun 22, 4:32 PM EDT | Severe Thunderstorm Warning | CTP | 73 min |
| Jun 22, 4:49 PM EDT | Severe Thunderstorm Warning | CTP | 71 min |
| Jun 22, 5:18 PM EDT | Tornado Warning | CTP | 42 min |
| Jun 22, 7:06 PM EDT | Special Weather Statement | CTP | 9 min |
| Jun 24, 12:16 PM EDT | Mesoscale Discussion | SPC | 89 min |
| Jun 24, 12:28 PM EDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jun 24, 1:29 PM EDT | Severe Thunderstorm Warning | CTP | 61 min |
| Jun 24, 2:02 PM EDT | Severe Thunderstorm Warning | CTP | 58 min |
| Jun 24, 2:43 PM EDT | Severe Thunderstorm Warning | CTP | 62 min |
| Jun 24, 3:07 PM EDT | Mesoscale Discussion | SPC | 53 min |
| Jun 27, 8:31 PM EDT | Special Weather Statement | CTP | 44 min |
| Jun 28, 12:26 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 28, 1:12 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 28, 3:53 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 5, 12:46 PM EDT | Heat Advisory | CTP | 55 hr |
| Jul 8, 3:58 PM EDT | Special Weather Statement | CTP | 32 min |
| Jul 12, 4:59 PM EDT | Special Weather Statement | CTP | 31 min |
| Jul 12, 5:18 PM EDT | Severe Thunderstorm Warning | CTP | 42 min |
| Jul 12, 7:40 PM EDT | Special Weather Statement | CTP | 35 min |
| Jul 12, 7:53 PM EDT | Special Weather Statement | CTP | 37 min |
| Jul 13, 3:36 AM EDT | Areal Flood Advisory | CTP | 6 hr |
| Jul 13, 9:55 PM EDT | Special Weather Statement | CTP | 110 min |
| Jul 14, 1:04 AM EDT | Areal Flood Advisory | CTP | 3 hr |
| Jul 14, 10:10 AM EDT | Areal Flood Advisory | CTP | 3 hr |
| Jul 14, 10:41 AM EDT | Flash Flood Warning | CTP | 4 hr |
| Jul 14, 1:58 PM EDT | Areal Flood Warning | CTP | 4 hr |
| Jul 19, 5:05 AM EDT | Special Weather Statement | CTP | 55 min |
| Jul 19, 1:17 PM EDT | Mesoscale Discussion | SPC | 58 min |
| Jul 19, 4:42 PM EDT | Special Weather Statement | CTP | 33 min |
| Jul 19, 5:24 PM EDT | Special Weather Statement | CTP | 36 min |
| Jul 19, 5:37 PM EDT | Severe Thunderstorm Warning | CTP | 23 min |
| Jul 19, 8:39 PM EDT | Special Weather Statement | CTP | 21 min |
| Jul 21, 11:27 AM EDT | Severe Thunderstorm Watch | SPC | 9 hr |
| Jul 21, 12:38 PM EDT | Mesoscale Discussion | SPC | 67 min |
| Jul 21, 3:41 PM EDT | Mesoscale Discussion | SPC | 64 min |
| Jul 21, 7:00 PM EDT | Mesoscale Discussion | SPC | 90 min |
| Jul 21, 7:35 PM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Jul 21, 10:41 PM EDT | Special Weather Statement | CTP | 34 min |
| Jul 23, 6:13 AM EDT | Excessive Heat Watch | CTP | 10 hr |
| Jul 23, 6:13 AM EDT | Heat Advisory | CTP | 15 hr |
| Jul 23, 4:18 PM EDT | Excessive Heat Warning | CTP | 29 hr |
| Jul 23, 6:23 PM EDT | Mesoscale Discussion | SPC | 67 min |
| Jul 25, 10:48 AM EDT | Mesoscale Discussion | SPC | 27 min |
| Jul 25, 11:29 AM EDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jul 25, 12:50 PM EDT | Mesoscale Discussion | SPC | 55 min |
| Jul 25, 1:03 PM EDT | Tornado Warning | CTP | 27 min |
| Jul 25, 1:15 PM EDT | Severe Thunderstorm Warning | CTP | 60 min |
| Jul 25, 1:38 PM EDT | Severe Thunderstorm Warning | CTP | 52 min |
| Jul 25, 2:33 PM EDT | Severe Thunderstorm Warning | CTP | 42 min |
| Jul 25, 2:38 PM EDT | Areal Flood Advisory | CTP | 3 hr |
| Aug 4, 11:09 AM EDT | Heat Advisory | CTP | 9 hr |
| Aug 4, 3:10 PM EDT | Heat Advisory | CTP | 28 hr |
| Aug 4, 5:52 PM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Aug 4, 7:48 PM EDT | Mesoscale Discussion | SPC | 87 min |
| Aug 4, 8:39 PM EDT | Severe Thunderstorm Warning | CTP | 66 min |
| Aug 4, 9:25 PM EDT | Severe Thunderstorm Warning | CTP | 65 min |
| Aug 4, 9:50 PM EDT | Severe Thunderstorm Warning | CTP | 55 min |
| Aug 12, 3:15 PM EDT | Areal Flood Advisory | CTP | 3 hr |
| Aug 12, 3:48 PM EDT | Flash Flood Warning | CTP | 4 hr |
| Aug 16, 12:05 PM EDT | Severe Thunderstorm Watch | SPC | 9 hr |
| Aug 16, 2:17 PM EDT | Mesoscale Discussion | SPC | 88 min |
| Aug 16, 4:12 PM EDT | Severe Thunderstorm Warning | CTP | 63 min |
| Aug 16, 4:20 PM EDT | Severe Thunderstorm Warning | CTP | 55 min |
| Aug 16, 5:05 PM EDT | Tornado Warning | CTP | 25 min |
| Aug 16, 5:31 PM EDT | Special Weather Statement | CTP | 14 min |
| Aug 16, 5:37 PM EDT | Severe Thunderstorm Warning | CTP | 63 min |
| Aug 16, 7:16 PM EDT | Mesoscale Discussion | SPC | 59 min |
| Aug 16, 8:38 PM EDT | Areal Flood Advisory | CTP | 3 hr |
| Aug 16, 9:08 PM EDT | Severe Thunderstorm Warning | CTP | 67 min |
| Aug 16, 9:27 PM EDT | Flash Flood Warning | CTP | 3 hr |
| Aug 16, 10:12 PM EDT | Severe Thunderstorm Warning | CTP | 63 min |
| Sep 7, 9:59 PM EDT | Fire Weather Watch | CTP | 12 hr |
| Sep 8, 10:03 AM EDT | Red Flag Warning | CTP | 9 hr |
| Sep 22, 2:34 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Sep 22, 3:19 PM EDT | Severe Thunderstorm Warning | CTP | 56 min |
| Sep 22, 3:57 PM EDT | Severe Thunderstorm Warning | CTP | 78 min |
| Sep 22, 4:15 PM EDT | Severe Thunderstorm Warning | CTP | 60 min |
| Sep 22, 4:46 PM EDT | Mesoscale Discussion | SPC | 59 min |
| Sep 22, 5:02 PM EDT | Severe Thunderstorm Warning | CTP | 58 min |
| Sep 22, 6:17 PM EDT | Severe Thunderstorm Warning | CTP | 58 min |
| Sep 22, 6:47 PM EDT | Severe Thunderstorm Warning | CTP | 73 min |
| Sep 22, 7:14 PM EDT | Mesoscale Discussion | SPC | 61 min |
| Sep 22, 7:45 PM EDT | Severe Thunderstorm Warning | CTP | 60 min |
| Sep 27, 1:03 PM EDT | Mesoscale Discussion | SPC | 87 min |
| Sep 27, 3:03 PM EDT | Areal Flood Advisory | CTP | 4 hr |
| Sep 27, 3:29 PM EDT | Special Weather Statement | CTP | 31 min |
| Sep 28, 8:00 AM EDT | Mesoscale Discussion | SPC | 2 hr |
| Sep 28, 9:15 AM EDT | Special Weather Statement | CTP | 30 min |
| Sep 28, 10:18 AM EDT | Special Weather Statement | CTP | 27 min |
| Sep 28, 10:20 AM EDT | Special Weather Statement | CTP | 25 min |
| Sep 29, 3:16 AM EDT | Flood Watch | CTP | 50 hr |
| Sep 30, 7:23 AM EDT | Special Weather Statement | CTP | 37 min |
| Sep 30, 7:50 AM EDT | Areal Flood Advisory | CTP | 3 hr |
| Sep 30, 8:28 AM EDT | Areal Flood Warning | CTP | 12 hr |
| Sep 30, 8:58 AM EDT | Severe Thunderstorm Warning | CTP | 62 min |
| Sep 30, 10:05 AM EDT | Special Weather Statement | CTP | 55 min |
| Sep 30, 10:38 AM EDT | Severe Thunderstorm Warning | CTP | 37 min |
| Sep 30, 10:49 AM EDT | Mesoscale Discussion | SPC | 116 min |
| Sep 30, 11:07 AM EDT | River Flood Warning | CTP | 34 hr |
| Sep 30, 12:39 PM EDT | Tornado Watch | SPC | 6 hr |
| Sep 30, 12:45 PM EDT | Special Weather Statement | CTP | 30 min |
| Sep 30, 1:27 PM EDT | Special Weather Statement | CTP | 33 min |
| Sep 30, 1:42 PM EDT | Flash Flood Warning | CTP | 6 hr |
| Sep 30, 3:16 PM EDT | Mesoscale Discussion | SPC | 119 min |
| Sep 30, 7:24 PM EDT | Flash Flood Warning | CTP | 6 hr |
| Oct 1, 1:13 AM EDT | Areal Flood Warning | CTP | 8 hr |
| Oct 1, 9:10 AM EDT | Areal Flood Warning | CTP | 6 hr |
| Oct 1, 3:14 PM EDT | Areal Flood Warning | CTP | 6 hr |
| Oct 11, 3:38 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Oct 12, 3:05 AM EDT | Special Weather Statement | CTP | 40 min |
| Oct 22, 1:36 PM EDT | Frost Advisory | CTP | 19 hr |
| Oct 29, 3:29 AM EDT | Freeze Watch | CTP | 11 hr |
| Oct 29, 2:28 PM EDT | Freeze Warning | CTP | 19 hr |
| Nov 16, 2:25 PM EST | Wind Advisory | CTP | 28 hr |
| Nov 17, 12:06 AM EST | Severe Thunderstorm Watch | SPC | 4 hr |
| Nov 17, 12:50 AM EST | Areal Flood Advisory | CTP | 3 hr |
| Nov 17, 1:22 AM EST | Special Weather Statement | CTP | 38 min |
| Nov 17, 1:45 AM EST | Severe Thunderstorm Warning | CTP | 46 min |
| Nov 29, 1:23 PM EST | Flood Watch | CTP | 49 hr |
| Dec 1, 5:01 AM EST | Areal Flood Advisory | CTP | 6 hr |
| Dec 1, 6:55 AM EST | Mesoscale Discussion | SPC | 65 min |
| Dec 1, 9:59 AM EST | Special Weather Statement | CTP | 31 min |
| Dec 1, 11:36 AM EST | Areal Flood Advisory | CTP | 4 hr |
| Dec 10, 12:33 PM EST | Special Weather Statement | CTP | 2 hr |
| Dec 11, 6:58 PM EST | Special Weather Statement | CTP | 2 hr |
| Dec 11, 7:16 PM EST | Freezing Rain Advisory | CTP | 3 hr |
| Dec 13, 8:21 AM EST | Special Weather Statement | CTP | 54 min |
| Dec 25, 12:01 PM EST | Winter Storm Watch | CTP | 17 hr |
| Dec 26, 4:31 AM EST | Winter Storm Warning | CTP | 22 hr |
| Dec 27, 3:32 AM EST | Wind Advisory | CTP | 17 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 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.