Alert archive / Pennsylvania / Adams County
Weather alerts in Adams County, Pennsylvania, 2009
166 weather alerts in 2009, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Adams County and its neighbors
Each county as a circle sized by its count in 2009. Tap one for its archive.
- Alerts
- 166
- Warnings
- 31
- Watches
- 23
- Advisories
- 55
- Busiest month
- August34 alerts
- Busiest day
- May 29, 20098 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
Adams County, 2009
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 24 | 14 | 42% | 2 | 50% | 9 min |
| Flash flood warnings | 3 | 2 | 33% | 0 |
Each office's whole area, 2009
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS State College, PA: tornado warnings | 13 | 3 | 77% | 5 | 80% | 22 min |
| NWS State College, PA: severe thunderstorm warnings | 166 | 86 | 48% | 182 | 80% | 26 min |
| NWS State College, PA: flash flood warnings | 38 | 23 | 39% | 43 | 93% | 64 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 5, 3:10 AM EST | Winter Storm Watch | CTP | 19 hr |
| Jan 5, 10:11 PM EST | Winter Weather Advisory | CTP | 72 hr |
| Jan 6, 5:17 PM EST | Mesoscale Discussion | SPC | 4 hr |
| Jan 7, 12:10 AM EST | Mesoscale Discussion | SPC | 4 hr |
| Jan 8, 3:30 PM EST | Winter Storm Watch | CTP | 23 hr |
| Jan 9, 2:32 PM EST | Winter Weather Advisory | CTP | 37 hr |
| Jan 26, 3:30 AM EST | Winter Storm Watch | CTP | 32 hr |
| Jan 27, 11:40 AM EST | Winter Storm Warning | CTP | 31 hr |
| Jan 28, 12:31 AM EST | Mesoscale Discussion | SPC | 5 hr |
| Feb 3, 8:40 PM EST | Winter Weather Advisory | CTP | 28 hr |
| Feb 10, 3:31 PM EST | High Wind Watch | CTP | 24 hr |
| Feb 11, 3:09 PM EST | High Wind Warning | CTP | 28 hr |
| Feb 11, 3:09 PM EST | Wind Advisory | CTP | 32 hr |
| Feb 11, 8:00 PM EST | Mesoscale Discussion | SPC | 60 min |
| Feb 11, 8:19 PM EST | Severe Thunderstorm Watch | SPC | 3 hr |
| Feb 11, 8:41 PM EST | Severe Thunderstorm Warning | CTP | 64 min |
| Feb 11, 10:14 PM EST | Mesoscale Discussion | SPC | 61 min |
| Mar 1, 11:31 AM EST | Winter Weather Advisory | CTP | 24 hr |
| Mar 8, 3:29 PM EDT | Wind Advisory | CTP | 24 hr |
| Mar 10, 3:48 PM EDT | Wind Advisory | CTP | 28 hr |
| Mar 27, 3:55 AM EDT | Dense Fog Advisory | CTP | 6 hr |
| Mar 29, 1:49 PM EDT | Mesoscale Discussion | SPC | 116 min |
| Mar 29, 3:33 PM EDT | Severe Thunderstorm Warning | CTP | 42 min |
| Apr 3, 3:04 AM EDT | High Wind Watch | CTP | 9 hr |
| Apr 3, 9:31 AM EDT | Special Weather Statement | CTP | 74 min |
| Apr 3, 11:47 AM EDT | Wind Advisory | CTP | 28 hr |
| Apr 16, 3:06 PM EDT | Frost Advisory | CTP | 18 hr |
| Apr 23, 2:57 AM EDT | Frost Advisory | CTP | 29 hr |
| Apr 28, 10:43 AM EDT | Red Flag Warning | CTP | 9 hr |
| May 4, 1:57 PM EDT | Areal Flood Advisory | CTP | 4 hr |
| May 5, 3:11 PM EDT | Flood Watch | CTP | 36 hr |
| May 7, 1:17 AM EDT | Areal Flood Advisory | CTP | 3 hr |
| May 15, 2:39 AM EDT | Dense Fog Advisory | CTP | 5 hr |
| May 16, 1:00 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| May 16, 3:55 PM EDT | Mesoscale Discussion | SPC | 65 min |
| May 16, 6:29 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| May 16, 10:00 PM EDT | Areal Flood Advisory | CTP | 2 hr |
| May 18, 3:28 PM EDT | Frost Advisory | CTP | 17 hr |
| May 24, 7:11 PM EDT | Mesoscale Discussion | SPC | 64 min |
| May 28, 8:02 PM EDT | Areal Flood Advisory | CTP | 3 hr |
| May 29, 12:35 AM EDT | Areal Flood Advisory | CTP | 3 hr |
| May 29, 1:58 AM EDT | Areal Flood Advisory | CTP | 3 hr |
| May 29, 12:20 PM EDT | Mesoscale Discussion | SPC | 55 min |
| May 29, 1:14 PM EDT | Special Weather Statement | CTP | 91 min |
| May 29, 1:26 PM EDT | Severe Thunderstorm Watch | SPC | 8 hr |
| May 29, 1:52 PM EDT | Severe Thunderstorm Warning | CTP | 53 min |
| May 29, 2:13 PM EDT | Severe Thunderstorm Warning | CTP | 62 min |
| Jun 2, 1:31 PM EDT | Mesoscale Discussion | SPC | 89 min |
| Jun 2, 2:33 PM EDT | Special Weather Statement | CTP | 57 min |
| Jun 2, 11:40 PM EDT | Severe Thunderstorm Warning | CTP | 65 min |
| Jun 3, 12:26 AM EDT | Severe Thunderstorm Warning | CTP | 79 min |
| Jun 9, 1:31 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jun 9, 1:42 PM EDT | Severe Thunderstorm Warning | CTP | 63 min |
| Jun 9, 2:41 PM EDT | Severe Thunderstorm Warning | CTP | 64 min |
| Jun 9, 3:40 PM EDT | Mesoscale Discussion | SPC | 65 min |
| Jun 9, 3:44 PM EDT | Severe Thunderstorm Warning | CTP | 49 min |
| Jun 9, 3:55 PM EDT | Areal Flood Advisory | CTP | 3 hr |
| Jun 10, 1:57 PM EDT | Mesoscale Discussion | SPC | 93 min |
| Jun 10, 3:01 PM EDT | Special Weather Statement | CTP | 59 min |
| Jun 10, 7:42 PM EDT | Special Weather Statement | CTP | 63 min |
| Jun 10, 7:47 PM EDT | Areal Flood Advisory | CTP | 118 min |
| Jun 11, 4:04 AM EDT | Flash Flood Watch | CTP | 23 hr |
| Jun 11, 11:51 AM EDT | Mesoscale Discussion | SPC | 84 min |
| Jun 11, 9:18 PM EDT | Special Weather Statement | CTP | 42 min |
| Jun 11, 10:01 PM EDT | Mesoscale Discussion | SPC | 59 min |
| Jun 13, 6:06 PM EDT | Severe Thunderstorm Warning | CTP | 54 min |
| Jun 20, 7:15 AM EDT | Areal Flood Advisory | CTP | 3 hr |
| Jun 26, 2:19 PM EDT | Mesoscale Discussion | SPC | 56 min |
| Jun 26, 2:42 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 26, 4:06 PM EDT | Special Weather Statement | CTP | 24 min |
| Jun 26, 7:33 PM EDT | Mesoscale Discussion | SPC | 57 min |
| Jun 26, 9:11 PM EDT | Mesoscale Discussion | SPC | 64 min |
| Jun 30, 11:59 AM EDT | Special Weather Statement | CTP | 61 min |
| Jun 30, 12:39 PM EDT | Severe Thunderstorm Warning | CTP | 81 min |
| Jun 30, 2:05 PM EDT | Severe Thunderstorm Warning | CTP | 40 min |
| Jul 1, 12:03 PM EDT | Mesoscale Discussion | SPC | 87 min |
| Jul 11, 3:01 PM EDT | Severe Thunderstorm Warning | CTP | 59 min |
| Jul 11, 3:58 PM EDT | Special Weather Statement | CTP | 62 min |
| Jul 11, 7:13 PM EDT | Special Weather Statement | CTP | 62 min |
| Jul 21, 1:56 PM EDT | Mesoscale Discussion | SPC | 64 min |
| Jul 22, 7:17 PM EDT | Areal Flood Advisory | CTP | 110 min |
| Jul 22, 9:02 PM EDT | Areal Flood Advisory | CTP | 3 hr |
| Jul 23, 3:21 PM EDT | Areal Flood Advisory | CTP | 3 hr |
| Jul 23, 4:57 PM EDT | Flash Flood Warning | CTP | 3 hr |
| Jul 23, 6:14 PM EDT | Areal Flood Advisory | CTP | 41 min |
| Jul 23, 6:33 PM EDT | Special Weather Statement | CTP | 57 min |
| Jul 23, 6:41 PM EDT | Flash Flood Warning | CTP | 99 min |
| Jul 23, 9:57 PM EDT | Special Weather Statement | CTP | 78 min |
| Jul 24, 3:34 PM EDT | Mesoscale Discussion | SPC | 86 min |
| Jul 24, 4:20 PM EDT | Severe Thunderstorm Warning | CTP | 55 min |
| Jul 24, 4:56 PM EDT | Areal Flood Advisory | CTP | 2 hr |
| Jul 25, 3:05 PM EDT | Mesoscale Discussion | SPC | 55 min |
| Jul 25, 3:50 PM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Jul 25, 7:43 PM EDT | Mesoscale Discussion | SPC | 62 min |
| Jul 26, 12:28 AM EDT | Special Weather Statement | CTP | 62 min |
| Jul 26, 3:40 AM EDT | Flash Flood Watch | CTP | 16 hr |
| Jul 26, 1:40 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 26, 3:14 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 26, 3:51 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 27, 7:32 PM EDT | Special Weather Statement | CTP | 28 min |
| Jul 29, 4:52 PM EDT | Severe Thunderstorm Warning | CTP | 53 min |
| Jul 29, 5:46 PM EDT | Severe Thunderstorm Warning | CTP | 59 min |
| Jul 29, 9:25 PM EDT | Special Weather Statement | CTP | 80 min |
| Aug 1, 4:05 AM EDT | Dense Fog Advisory | CTP | 5 hr |
| Aug 1, 11:33 PM EDT | Special Weather Statement | CTP | 27 min |
| Aug 2, 12:36 AM EDT | Areal Flood Advisory | CTP | 3 hr |
| Aug 2, 5:08 AM EDT | Flash Flood Watch | CTP | 10 hr |
| Aug 2, 5:27 AM EDT | Areal Flood Advisory | CTP | 3 hr |
| Aug 2, 7:08 AM EDT | Special Weather Statement | CTP | 52 min |
| Aug 2, 7:30 AM EDT | Severe Thunderstorm Warning | CTP | 60 min |
| Aug 2, 8:19 AM EDT | Areal Flood Advisory | CTP | 3 hr |
| Aug 2, 8:29 AM EDT | Severe Thunderstorm Warning | CTP | 61 min |
| Aug 2, 8:11 PM EDT | Areal Flood Advisory | CTP | 94 min |
| Aug 9, 2:45 PM EDT | Mesoscale Discussion | SPC | 60 min |
| Aug 9, 3:09 PM EDT | Heat Advisory | CTP | 28 hr |
| Aug 9, 3:18 PM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Aug 10, 5:09 PM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Aug 10, 8:15 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 11, 4:21 PM EDT | Severe Thunderstorm Warning | CTP | 54 min |
| Aug 11, 4:40 PM EDT | Areal Flood Advisory | CTP | 110 min |
| Aug 11, 5:01 PM EDT | Flash Flood Warning | CTP | 3 hr |
| Aug 12, 8:56 PM EDT | Areal Flood Advisory | CTP | 3 hr |
| Aug 14, 4:04 AM EDT | Dense Fog Advisory | CTP | 6 hr |
| Aug 15, 6:30 AM EDT | Dense Fog Advisory | CTP | 4 hr |
| Aug 18, 4:18 PM EDT | Severe Thunderstorm Warning | CTP | 57 min |
| Aug 18, 4:37 PM EDT | Special Weather Statement | CTP | 53 min |
| Aug 18, 4:54 PM EDT | Special Weather Statement | CTP | 36 min |
| Aug 18, 5:05 PM EDT | Severe Thunderstorm Warning | CTP | 55 min |
| Aug 21, 11:13 AM EDT | Special Weather Statement | CTP | 62 min |
| Aug 21, 11:28 AM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Aug 21, 11:32 AM EDT | Severe Thunderstorm Warning | CTP | 58 min |
| Aug 21, 12:06 PM EDT | Severe Thunderstorm Warning | CTP | 54 min |
| Aug 21, 12:21 PM EDT | Areal Flood Advisory | CTP | 114 min |
| Aug 28, 5:51 AM EDT | Areal Flood Advisory | CTP | 4 hr |
| Aug 28, 4:52 PM EDT | Special Weather Statement | CTP | 23 min |
| Aug 28, 5:14 PM EDT | Special Weather Statement | CTP | 46 min |
| Aug 28, 10:13 PM EDT | Areal Flood Advisory | CTP | 3 hr |
| Sep 23, 8:49 PM EDT | Special Weather Statement | CTP | 26 min |
| Sep 23, 9:12 PM EDT | Special Weather Statement | CTP | 78 min |
| Oct 6, 2:59 PM EDT | Wind Advisory | CTP | 29 hr |
| Oct 13, 3:28 AM EDT | Frost Advisory | CTP | 30 hr |
| Oct 18, 1:22 AM EDT | Special Weather Statement | CTP | 83 min |
| Oct 18, 2:50 AM EDT | Special Weather Statement | CTP | 3 hr |
| Oct 18, 11:16 AM EDT | Freeze Watch | CTP | 3 hr |
| Oct 18, 2:26 PM EDT | Freeze Warning | CTP | 19 hr |
| Oct 19, 2:30 PM EDT | Frost Advisory | CTP | 18 hr |
| Oct 24, 2:55 PM EDT | Areal Flood Advisory | CTP | 3 hr |
| Nov 26, 3:07 AM EST | Dense Fog Advisory | CTP | 6 hr |
| Dec 3, 3:58 AM EST | Special Weather Statement | CTP | 47 min |
| Dec 5, 4:27 AM EST | Winter Weather Advisory | CTP | 14 hr |
| Dec 7, 2:41 PM EST | Winter Storm Watch | CTP | 21 hr |
| Dec 9, 3:29 AM EST | Flood Watch | CTP | 9 hr |
| Dec 9, 3:38 AM EST | Wind Advisory | CTP | 26 hr |
| Dec 12, 3:17 PM EST | Freezing Rain Advisory | CTP | 25 hr |
| Dec 17, 10:08 PM EST | Winter Storm Watch | CTP | 17 hr |
| Dec 18, 2:38 PM EST | Winter Storm Warning | CTP | 32 hr |
| Dec 19, 12:34 AM EST | Mesoscale Discussion | SPC | 5 hr |
| Dec 19, 6:57 AM EST | Mesoscale Discussion | SPC | 6 hr |
| Dec 19, 12:27 PM EST | Mesoscale Discussion | SPC | 6 hr |
| Dec 24, 2:05 PM EST | Winter Weather Advisory | CTP | 29 hr |
| Dec 26, 8:56 AM EST | Areal Flood Advisory | CTP | 6 hr |
| Dec 26, 5:25 PM EST | Areal Flood Advisory | CTP | 6 hr |
| Dec 26, 11:25 PM EST | Areal Flood Advisory | CTP | 3 hr |
| Dec 28, 2:33 PM EST | Wind Advisory | CTP | 28 hr |
| Dec 30, 2:45 PM EST | Winter Weather Advisory | CTP | 19 hr |
| Dec 31, 6:40 PM EST | Winter Weather Advisory | CTP | 6 hr |
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 | 23 |
| Severe Thunderstorm Watch | 10 |
| Mesoscale Discussion | 30 |
| Special Weather Statement | 27 |
| Flooding | |
| Flash Flood Warning | 3 |
| Flash Flood Watch | 3 |
| Flood Watch | 2 |
| Areal Flood Advisory | 27 |
| Winter | |
| Winter Storm Warning | 2 |
| Winter Storm Watch | 5 |
| Freezing Rain Advisory | 1 |
| Winter Weather Advisory | 8 |
| Heat | |
| Heat Advisory | 1 |
| Cold | |
| Freeze Warning | 1 |
| Freeze Watch | 1 |
| Frost Advisory | 5 |
| Wind and dust | |
| High Wind Warning | 1 |
| High Wind Watch | 2 |
| Wind Advisory | 7 |
| Fire | |
| Red Flag Warning | 1 |
| Fog and smoke | |
| Dense Fog Advisory | 6 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20082010
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.