Alert archive / Pennsylvania / Montgomery County
Weather alerts in Montgomery County, Pennsylvania, 2011
262 weather alerts in 2011, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Montgomery County and its neighbors
Each county as a circle sized by its count in 2011. Tap one for its archive.
- Alerts
- 262
- Warnings
- 92
- Watches
- 15
- Advisories
- 39
- Busiest month
- August72 alerts
- Busiest day
- April 28, 201114 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 4 tornado warnings covering Montgomery County in 2011 had a tornado report inside them.
Montgomery County, 2011
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 4 | 0 | 100% | 0 | ||
| Severe thunderstorm warnings | 29 | 21 | 28% | 16 | 75% | 29 min |
| Flash flood warnings | 9 | 1 | 89% | 0 |
Each office's whole area, 2011
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Philadelphia/Mount Holly: tornado warnings | 29 | 2 | 93% | 7 | 29% | 17 min |
| NWS Philadelphia/Mount Holly: severe thunderstorm warnings | 307 | 164 | 47% | 361 | 86% | 25 min |
| NWS Philadelphia/Mount Holly: flash flood warnings | 68 | 12 | 82% | 21 | 67% | 70 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 18, 12:29 AM EST | Mesoscale Discussion | SPC | 6 hr |
| Jan 26, 11:12 AM EST | Mesoscale Discussion | SPC | 4 hr |
| Jan 26, 2:19 PM EST | Mesoscale Discussion | SPC | 6 hr |
| Feb 1, 8:39 PM EST | Mesoscale Discussion | SPC | 6 hr |
| Feb 25, 12:11 PM EST | Special Weather Statement | PHI | 64 min |
| Feb 28, 9:23 AM EST | Special Weather Statement | PHI | 112 min |
| Mar 6, 3:14 PM EST | Special Weather Statement | PHI | 61 min |
| Mar 6, 5:33 PM EST | Areal Flood Advisory | PHI | 4 hr |
| Mar 6, 9:30 PM EST | Areal Flood Advisory | PHI | 7 hr |
| Mar 6, 10:11 PM EST | Areal Flood Warning | PHI | 9 hr |
| Mar 10, 7:28 AM EST | Areal Flood Advisory | PHI | 6 hr |
| Mar 10, 1:17 PM EST | Areal Flood Advisory | PHI | 5 hr |
| Mar 10, 4:36 PM EST | Areal Flood Warning | PHI | 37 hr |
| Mar 10, 9:31 PM EST | River Flood Warning | PHI | 23 hr |
| Mar 10, 9:31 PM EST | River Flood Warning | PHI | 30 hr |
| Mar 10, 9:31 PM EST | River Flood Warning | PHI | 12 hr |
| Mar 10, 9:31 PM EST | River Flood Warning | PHI | 18 hr |
| Mar 10, 9:41 PM EST | River Flood Warning | PHI | 12 hr |
| Mar 10, 11:47 PM EST | Areal Flood Warning | PHI | 12 hr |
| Mar 23, 6:53 PM EDT | Special Weather Statement | PHI | 112 min |
| Mar 23, 8:30 PM EDT | Special Weather Statement | PHI | 2 hr |
| Apr 5, 5:03 AM EDT | Mesoscale Discussion | SPC | 27 min |
| Apr 5, 5:07 AM EDT | Severe Thunderstorm Watch | SPC | 2 hr |
| Apr 5, 5:23 AM EDT | Severe Thunderstorm Warning | PHI | 67 min |
| Apr 5, 8:55 AM EDT | Special Weather Statement | PHI | 65 min |
| Apr 5, 9:37 AM EDT | Special Weather Statement | PHI | 53 min |
| Apr 5, 10:16 AM EDT | Severe Thunderstorm Warning | PHI | 44 min |
| Apr 11, 8:04 PM EDT | Special Weather Statement | PHI | 56 min |
| Apr 11, 9:03 PM EDT | Special Weather Statement | PHI | 57 min |
| Apr 12, 10:00 AM EDT | Special Weather Statement | PHI | 90 min |
| Apr 16, 6:22 PM EDT | Areal Flood Warning | PHI | 12 hr |
| Apr 16, 6:38 PM EDT | Mesoscale Discussion | SPC | 97 min |
| Apr 16, 8:08 PM EDT | Areal Flood Warning | PHI | 8 hr |
| Apr 16, 11:11 PM EDT | River Flood Warning | PHI | 6 hr |
| Apr 17, 3:56 AM EDT | Areal Flood Warning | PHI | 6 hr |
| Apr 23, 7:43 AM EDT | Special Weather Statement | PHI | 2 hr |
| Apr 24, 2:12 PM EDT | Mesoscale Discussion | SPC | 93 min |
| Apr 24, 3:40 PM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Apr 24, 6:10 PM EDT | Mesoscale Discussion | SPC | 65 min |
| Apr 27, 1:48 PM EDT | Special Weather Statement | PHI | 87 min |
| Apr 27, 2:31 PM EDT | Severe Thunderstorm Warning | PHI | 44 min |
| Apr 27, 3:55 PM EDT | Mesoscale Discussion | SPC | 65 min |
| Apr 27, 6:50 PM EDT | Mesoscale Discussion | SPC | 55 min |
| Apr 27, 8:15 PM EDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Apr 28, 3:32 AM EDT | Mesoscale Discussion | SPC | 28 min |
| Apr 28, 4:05 AM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Apr 28, 6:21 AM EDT | Mesoscale Discussion | SPC | 54 min |
| Apr 28, 6:23 AM EDT | Special Weather Statement | PHI | 52 min |
| Apr 28, 6:56 AM EDT | Severe Thunderstorm Warning | PHI | 34 min |
| Apr 28, 9:45 AM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Apr 28, 10:00 AM EDT | Severe Thunderstorm Warning | PHI | 60 min |
| Apr 28, 10:48 AM EDT | Areal Flood Advisory | PHI | 3 hr |
| Apr 28, 10:57 AM EDT | Severe Thunderstorm Warning | PHI | 63 min |
| Apr 28, 11:49 AM EDT | Mesoscale Discussion | SPC | 56 min |
| Apr 28, 12:03 PM EDT | Special Weather Statement | PHI | 57 min |
| Apr 28, 12:11 PM EDT | Severe Thunderstorm Warning | PHI | 31 min |
| Apr 28, 12:45 PM EDT | Special Weather Statement | PHI | 60 min |
| May 3, 9:43 PM EDT | Special Weather Statement | PHI | 47 min |
| May 7, 4:29 PM EDT | Special Weather Statement | PHI | 91 min |
| May 7, 5:20 PM EDT | Special Weather Statement | PHI | 85 min |
| May 14, 11:46 PM EDT | Special Weather Statement | PHI | 89 min |
| May 15, 12:52 AM EDT | Special Weather Statement | PHI | 83 min |
| May 15, 7:28 PM EDT | Special Weather Statement | PHI | 62 min |
| May 15, 9:04 PM EDT | Special Weather Statement | PHI | 56 min |
| May 15, 9:53 PM EDT | Special Weather Statement | PHI | 67 min |
| May 15, 10:12 PM EDT | Special Weather Statement | PHI | 63 min |
| May 15, 10:16 PM EDT | Areal Flood Advisory | PHI | 3 hr |
| May 15, 10:52 PM EDT | Special Weather Statement | PHI | 53 min |
| May 15, 11:14 PM EDT | Areal Flood Advisory | PHI | 3 hr |
| May 18, 1:01 PM EDT | Special Weather Statement | PHI | 59 min |
| May 18, 1:52 PM EDT | Tornado Warning | PHI | 24 min |
| May 18, 2:34 PM EDT | Mesoscale Discussion | SPC | 56 min |
| May 18, 3:05 PM EDT | Areal Flood Advisory | PHI | 115 min |
| May 18, 3:08 PM EDT | Mesoscale Discussion | SPC | 67 min |
| May 19, 10:47 AM EDT | Mesoscale Discussion | SPC | 88 min |
| May 19, 12:20 PM EDT | Severe Thunderstorm Watch | SPC | 8 hr |
| May 19, 2:17 PM EDT | Mesoscale Discussion | SPC | 58 min |
| May 19, 3:01 PM EDT | Areal Flood Advisory | PHI | 3 hr |
| May 19, 3:15 PM EDT | Special Weather Statement | PHI | 60 min |
| May 19, 5:02 PM EDT | Mesoscale Discussion | SPC | 58 min |
| May 19, 7:23 PM EDT | Areal Flood Warning | PHI | 82 min |
| May 23, 6:21 PM EDT | Special Weather Statement | PHI | 54 min |
| Jun 1, 12:58 PM EDT | Tornado Watch | SPC | 7 hr |
| Jun 9, 1:45 PM EDT | Mesoscale Discussion | SPC | 90 min |
| Jun 9, 2:34 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 9, 6:24 PM EDT | Severe Thunderstorm Warning | PHI | 66 min |
| Jun 9, 6:44 PM EDT | Severe Thunderstorm Warning | PHI | 61 min |
| Jun 9, 7:17 PM EDT | Mesoscale Discussion | SPC | 58 min |
| Jun 9, 7:27 PM EDT | Severe Thunderstorm Warning | PHI | 48 min |
| Jun 9, 7:42 PM EDT | Severe Thunderstorm Warning | PHI | 33 min |
| Jun 9, 8:10 PM EDT | Severe Thunderstorm Warning | PHI | 65 min |
| Jun 10, 5:28 PM EDT | Mesoscale Discussion | SPC | 92 min |
| Jun 11, 4:23 AM EDT | Special Weather Statement | PHI | 67 min |
| Jun 14, 5:46 PM EDT | Special Weather Statement | PHI | 59 min |
| Jun 14, 6:15 PM EDT | Areal Flood Advisory | PHI | 2 hr |
| Jun 22, 2:03 PM EDT | Mesoscale Discussion | SPC | 117 min |
| Jun 22, 2:53 PM EDT | Severe Thunderstorm Warning | PHI | 67 min |
| Jun 23, 10:04 AM EDT | Mesoscale Discussion | SPC | 116 min |
| Jun 24, 11:42 AM EDT | Mesoscale Discussion | SPC | 3 hr |
| Jun 24, 12:46 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 24, 4:13 PM EDT | Mesoscale Discussion | SPC | 92 min |
| Jun 28, 8:31 PM EDT | Special Weather Statement | PHI | 44 min |
| Jul 3, 4:58 PM EDT | Severe Thunderstorm Warning | PHI | 62 min |
| Jul 6, 4:46 PM EDT | Special Weather Statement | PHI | 89 min |
| Jul 7, 5:12 PM EDT | Severe Thunderstorm Warning | PHI | 63 min |
| Jul 8, 11:44 AM EDT | Mesoscale Discussion | SPC | 61 min |
| Jul 8, 1:51 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 8, 2:25 PM EDT | Areal Flood Advisory | PHI | 7 hr |
| Jul 8, 2:56 PM EDT | Areal Flood Advisory | PHI | 3 hr |
| Jul 8, 3:35 PM EDT | Special Weather Statement | PHI | 55 min |
| Jul 8, 3:44 PM EDT | Severe Thunderstorm Warning | PHI | 76 min |
| Jul 8, 5:52 PM EDT | Mesoscale Discussion | SPC | 83 min |
| Jul 23, 7:55 PM EDT | Severe Thunderstorm Warning | PHI | 30 min |
| Jul 24, 1:44 PM EDT | Special Weather Statement | PHI | 61 min |
| Jul 25, 1:12 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 25, 5:42 PM EDT | Mesoscale Discussion | SPC | 63 min |
| Jul 25, 6:23 PM EDT | Areal Flood Advisory | PHI | 3 hr |
| Jul 26, 5:24 PM EDT | Mesoscale Discussion | SPC | 66 min |
| Jul 29, 2:40 PM EDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jul 29, 4:40 PM EDT | Mesoscale Discussion | SPC | 95 min |
| Jul 29, 6:05 PM EDT | Severe Thunderstorm Warning | PHI | 55 min |
| Jul 29, 7:13 PM EDT | Special Weather Statement | PHI | 62 min |
| Jul 29, 7:31 PM EDT | Special Weather Statement | PHI | 59 min |
| Aug 1, 3:22 PM EDT | Mesoscale Discussion | SPC | 83 min |
| Aug 1, 4:33 PM EDT | Severe Thunderstorm Warning | PHI | 87 min |
| Aug 1, 5:11 PM EDT | Areal Flood Advisory | PHI | 2 hr |
| Aug 1, 6:18 PM EDT | Mesoscale Discussion | SPC | 57 min |
| Aug 3, 9:02 PM EDT | Special Weather Statement | PHI | 58 min |
| Aug 3, 9:53 PM EDT | Special Weather Statement | PHI | 52 min |
| Aug 3, 10:33 PM EDT | Special Weather Statement | PHI | 117 min |
| Aug 7, 12:48 AM EDT | Special Weather Statement | PHI | 57 min |
| Aug 7, 1:32 AM EDT | Areal Flood Advisory | PHI | 3 hr |
| Aug 8, 6:49 PM EDT | Special Weather Statement | PHI | 86 min |
| Aug 9, 11:46 AM EDT | Special Weather Statement | PHI | 59 min |
| Aug 9, 12:18 PM EDT | Severe Thunderstorm Warning | PHI | 57 min |
| Aug 9, 12:48 PM EDT | Mesoscale Discussion | SPC | 57 min |
| Aug 9, 3:05 PM EDT | Mesoscale Discussion | SPC | 55 min |
| Aug 9, 4:16 PM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Aug 9, 5:48 PM EDT | Special Weather Statement | PHI | 87 min |
| Aug 9, 7:07 PM EDT | Mesoscale Discussion | SPC | 83 min |
| Aug 14, 3:55 AM EDT | Flash Flood Warning | PHI | 4 hr |
| Aug 14, 7:43 AM EDT | Flash Flood Warning | PHI | 4 hr |
| Aug 14, 1:00 PM EDT | Areal Flood Warning | PHI | 8 hr |
| Aug 15, 1:05 PM EDT | Areal Flood Advisory | PHI | 4 hr |
| Aug 15, 1:56 PM EDT | Special Weather Statement | PHI | 94 min |
| Aug 18, 4:48 AM EDT | Special Weather Statement | PHI | 57 min |
| Aug 18, 5:45 AM EDT | Special Weather Statement | PHI | 60 min |
| Aug 18, 6:35 AM EDT | Areal Flood Advisory | PHI | 3 hr |
| Aug 18, 7:29 AM EDT | Special Weather Statement | PHI | 61 min |
| Aug 18, 6:39 PM EDT | Mesoscale Discussion | SPC | 96 min |
| Aug 18, 7:58 PM EDT | Severe Thunderstorm Warning | PHI | 31 min |
| Aug 18, 7:59 PM EDT | Severe Thunderstorm Warning | PHI | 61 min |
| Aug 18, 8:26 PM EDT | Areal Flood Advisory | PHI | 112 min |
| Aug 18, 8:31 PM EDT | Severe Thunderstorm Warning | PHI | 59 min |
| Aug 19, 1:14 AM EDT | Areal Flood Advisory | PHI | 3 hr |
| Aug 19, 12:43 PM EDT | Mesoscale Discussion | SPC | 62 min |
| Aug 19, 1:04 PM EDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Aug 19, 4:52 PM EDT | Severe Thunderstorm Warning | PHI | 53 min |
| Aug 19, 5:42 PM EDT | Severe Thunderstorm Warning | PHI | 48 min |
| Aug 19, 5:45 PM EDT | Areal Flood Advisory | PHI | 3 hr |
| Aug 19, 6:14 PM EDT | Severe Thunderstorm Warning | PHI | 65 min |
| Aug 19, 6:42 PM EDT | Mesoscale Discussion | SPC | 63 min |
| Aug 19, 8:03 PM EDT | Areal Flood Warning | PHI | 9 hr |
| Aug 19, 11:51 PM EDT | Areal Flood Warning | PHI | 3 hr |
| Aug 21, 11:54 AM EDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 21, 12:52 PM EDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Aug 21, 1:11 PM EDT | Special Weather Statement | PHI | 64 min |
| Aug 21, 1:25 PM EDT | Areal Flood Advisory | PHI | 110 min |
| Aug 21, 1:47 PM EDT | Severe Thunderstorm Warning | PHI | 58 min |
| Aug 21, 2:33 PM EDT | Areal Flood Advisory | PHI | 117 min |
| Aug 21, 2:43 PM EDT | Severe Thunderstorm Warning | PHI | 62 min |
| Aug 21, 4:35 PM EDT | Areal Flood Advisory | PHI | 3 hr |
| Aug 21, 6:05 PM EDT | Flash Flood Warning | PHI | 6 hr |
| Aug 21, 7:12 PM EDT | Mesoscale Discussion | SPC | 63 min |
| Aug 21, 7:35 PM EDT | Areal Flood Advisory | PHI | 115 min |
| Aug 25, 8:38 AM EDT | Special Weather Statement | PHI | 67 min |
| Aug 25, 9:35 AM EDT | Special Weather Statement | PHI | 55 min |
| Aug 25, 10:00 AM EDT | Areal Flood Advisory | PHI | 3 hr |
| Aug 27, 3:47 PM EDT | Areal Flood Advisory | PHI | 118 min |
| Aug 27, 4:06 PM EDT | River Flood Warning | PHI | 29 hr |
| Aug 27, 4:06 PM EDT | River Flood Warning | PHI | 23 hr |
| Aug 27, 4:06 PM EDT | River Flood Warning | PHI | 36 hr |
| Aug 27, 4:06 PM EDT | River Flood Warning | PHI | 35 hr |
| Aug 27, 5:42 PM EDT | Areal Flood Warning | PHI | 6 hr |
| Aug 27, 7:31 PM EDT | Mesoscale Discussion | SPC | 89 min |
| Aug 27, 7:56 PM EDT | Tornado Watch | SPC | 9 hr |
| Aug 27, 9:43 PM EDT | Areal Flood Warning | PHI | 6 hr |
| Aug 27, 10:23 PM EDT | Tornado Warning | PHI | 37 min |
| Aug 27, 10:36 PM EDT | Tornado Warning | PHI | 24 min |
| Aug 27, 11:22 PM EDT | Tornado Warning | PHI | 23 min |
| Aug 27, 11:37 PM EDT | Flash Flood Warning | PHI | 12 hr |
| Aug 28, 12:30 AM EDT | Mesoscale Discussion | SPC | 90 min |
| Aug 28, 3:50 AM EDT | Flash Flood Warning | PHI | 10 hr |
| Aug 28, 11:07 AM EDT | Areal Flood Warning | PHI | 18 hr |
| Aug 28, 1:27 PM EDT | Areal Flood Warning | PHI | 8 hr |
| Sep 5, 6:03 PM EDT | Special Weather Statement | PHI | 117 min |
| Sep 5, 8:19 PM EDT | Areal Flood Advisory | PHI | 116 min |
| Sep 5, 9:32 PM EDT | Areal Flood Warning | PHI | 9 hr |
| Sep 5, 10:53 PM EDT | Areal Flood Advisory | PHI | 3 hr |
| Sep 6, 1:42 AM EDT | Areal Flood Advisory | PHI | 3 hr |
| Sep 6, 5:43 PM EDT | Areal Flood Advisory | PHI | 3 hr |
| Sep 6, 6:32 PM EDT | Areal Flood Warning | PHI | 26 hr |
| Sep 6, 6:38 PM EDT | Areal Flood Warning | PHI | 23 hr |
| Sep 6, 11:13 PM EDT | River Flood Warning | PHI | 3 days |
| Sep 6, 11:19 PM EDT | River Flood Warning | PHI | 17 hr |
| Sep 7, 3:40 AM EDT | River Flood Warning | PHI | 54 hr |
| Sep 7, 4:26 AM EDT | River Flood Warning | PHI | 6 hr |
| Sep 7, 4:26 AM EDT | River Flood Warning | PHI | 3 days |
| Sep 7, 3:36 PM EDT | Mesoscale Discussion | SPC | 84 min |
| Sep 7, 4:06 PM EDT | River Flood Warning | PHI | 41 hr |
| Sep 7, 4:09 PM EDT | Special Weather Statement | PHI | 66 min |
| Sep 7, 5:10 PM EDT | Areal Flood Advisory | PHI | 3 hr |
| Sep 7, 8:24 PM EDT | Areal Flood Warning | PHI | 6 hr |
| Sep 7, 9:38 PM EDT | River Flood Warning | PHI | 13 hr |
| Sep 8, 1:25 AM EDT | Flash Flood Warning | PHI | 7 hr |
| Sep 8, 2:26 AM EDT | Flash Flood Warning | PHI | 6 hr |
| Sep 8, 8:36 AM EDT | Areal Flood Warning | PHI | 16 hr |
| Sep 8, 9:32 AM EDT | Areal Flood Warning | PHI | 15 hr |
| Sep 11, 6:38 PM EDT | Mesoscale Discussion | SPC | 97 min |
| Sep 11, 9:14 PM EDT | Flash Flood Warning | PHI | 110 min |
| Sep 11, 9:14 PM EDT | Special Weather Statement | PHI | 61 min |
| Sep 11, 9:54 PM EDT | Severe Thunderstorm Warning | PHI | 51 min |
| Sep 11, 9:56 PM EDT | Flash Flood Warning | PHI | 4 hr |
| Sep 11, 10:52 PM EDT | Special Weather Statement | PHI | 83 min |
| Sep 23, 10:52 AM EDT | Areal Flood Advisory | PHI | 5 hr |
| Sep 23, 5:27 PM EDT | Areal Flood Warning | PHI | 12 hr |
| Sep 23, 8:29 PM EDT | Special Weather Statement | PHI | 31 min |
| Sep 24, 4:13 AM EDT | River Flood Warning | PHI | 7 hr |
| Sep 24, 5:29 AM EDT | Areal Flood Warning | PHI | 5 hr |
| Sep 28, 1:54 AM EDT | Special Weather Statement | PHI | 51 min |
| Sep 28, 5:45 AM EDT | Special Weather Statement | PHI | 60 min |
| Sep 28, 3:20 PM EDT | Special Weather Statement | PHI | 55 min |
| Sep 28, 3:59 PM EDT | Special Weather Statement | PHI | 61 min |
| Sep 28, 4:33 PM EDT | Areal Flood Advisory | PHI | 2 hr |
| Sep 28, 4:45 PM EDT | Mesoscale Discussion | SPC | 60 min |
| Sep 28, 5:42 PM EDT | Areal Flood Advisory | PHI | 3 hr |
| Sep 28, 8:38 PM EDT | Areal Flood Warning | PHI | 8 hr |
| Sep 29, 12:35 PM EDT | Special Weather Statement | PHI | 55 min |
| Sep 29, 1:24 PM EDT | Special Weather Statement | PHI | 66 min |
| Oct 1, 8:47 PM EDT | Special Weather Statement | PHI | 58 min |
| Oct 1, 9:53 PM EDT | Special Weather Statement | PHI | 112 min |
| Oct 2, 1:26 AM EDT | Special Weather Statement | PHI | 2 hr |
| Oct 2, 4:56 AM EDT | Special Weather Statement | PHI | 3 hr |
| Oct 14, 12:25 PM EDT | Special Weather Statement | PHI | 80 min |
| Oct 14, 1:43 PM EDT | Special Weather Statement | PHI | 62 min |
| Nov 22, 5:54 PM EST | Areal Flood Advisory | PHI | 6 hr |
| Nov 22, 9:56 PM EST | Areal Flood Warning | PHI | 6 hr |
| Nov 23, 12:35 AM EST | Areal Flood Advisory | PHI | 6 hr |
| Nov 23, 3:08 AM EST | Special Weather Statement | PHI | 3 hr |
| Nov 23, 3:39 AM EST | River Flood Warning | PHI | 11 hr |
| Nov 23, 3:44 AM EST | Areal Flood Warning | PHI | 8 hr |
| Nov 23, 5:54 AM EST | River Flood Warning | PHI | 16 hr |
| Nov 23, 10:26 AM EST | River Flood Warning | PHI | 5 hr |
| Nov 23, 11:50 AM EST | Areal Flood Warning | PHI | 4 hr |
| Nov 29, 2:05 PM EST | Special Weather Statement | PHI | 55 min |
| Nov 29, 4:27 PM EST | Areal Flood Advisory | PHI | 4 hr |
| Dec 7, 6:51 AM EST | Areal Flood Advisory | PHI | 4 hr |
| Dec 7, 4:37 PM EST | Areal Flood Advisory | PHI | 4 hr |
| Dec 7, 8:04 PM EST | Areal Flood Warning | PHI | 18 hr |
| Dec 8, 2:21 AM EST | River Flood Warning | PHI | 10 hr |
| Dec 21, 9:54 PM EST | Special Weather Statement | PHI | 51 min |
| Dec 23, 6:27 AM EST | Areal Flood Warning | PHI | 93 min |
By product
Every kind of product issued here, grouped by hazard. Each opens the same place narrowed to that product.
| Product | Alerts |
|---|---|
| Severe storms | |
| Severe Thunderstorm Warning | 29 |
| Tornado Warning | 4 |
| Severe Thunderstorm Watch | 13 |
| Tornado Watch | 2 |
| Mesoscale Discussion | 46 |
| Special Weather Statement | 70 |
| Flooding | |
| Areal Flood Warning | 28 |
| Flash Flood Warning | 9 |
| River Flood Warning | 22 |
| Areal Flood Advisory | 39 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20102012
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.