Alert archive / Pennsylvania / Dauphin County
Weather alerts in Dauphin County, Pennsylvania, 2009
172 weather alerts in 2009, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Dauphin County and its neighbors
Each county as a circle sized by its count in 2009. Tap one for its archive.
- Alerts
- 172
- Warnings
- 41
- Watches
- 21
- Advisories
- 51
- Busiest month
- August42 alerts
- Busiest day
- June 9, 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.
0 of 1 tornado warnings covering Dauphin County in 2009 had a tornado report inside them.
Dauphin County, 2009
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 1 | 0 | 100% | 0 | ||
| Severe thunderstorm warnings | 31 | 21 | 32% | 12 | 83% | 21 min |
| Flash flood warnings | 1 | 1 | 0% | 1 | 100% | 25 min |
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 | Ice Storm Warning | CTP | 39 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 Storm Warning | CTP | 30 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 |
| Jan 28, 7:53 AM EST | Mesoscale Discussion | SPC | 5 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, 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 23, 4:48 AM EDT | Red Flag Warning | CTP | 15 hr |
| Mar 27, 3:55 AM EDT | Dense Fog Advisory | CTP | 6 hr |
| Apr 3, 3:04 AM EDT | High Wind Watch | CTP | 9 hr |
| Apr 3, 11:47 AM EDT | Wind Advisory | CTP | 28 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 14, 6:04 PM EDT | Special Weather Statement | CTP | 26 min |
| May 14, 6:56 PM EDT | Special Weather Statement | CTP | 34 min |
| May 15, 2:39 AM EDT | Dense Fog Advisory | CTP | 5 hr |
| May 16, 12:05 PM EDT | Mesoscale Discussion | SPC | 55 min |
| 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, 7:11 PM EDT | Severe Thunderstorm Warning | CTP | 64 min |
| May 16, 7:32 PM EDT | Severe Thunderstorm Warning | CTP | 58 min |
| May 16, 7:38 PM EDT | Severe Thunderstorm Warning | CTP | 52 min |
| May 16, 8:45 PM EDT | Areal Flood Advisory | CTP | 2 hr |
| May 17, 3:20 AM EDT | Frost Advisory | CTP | 30 hr |
| May 18, 3:28 PM EDT | Frost Advisory | CTP | 17 hr |
| May 23, 12:49 PM EDT | Mesoscale Discussion | SPC | 56 min |
| May 24, 7:11 PM EDT | Mesoscale Discussion | SPC | 64 min |
| May 28, 8:02 PM EDT | Areal Flood Advisory | CTP | 3 hr |
| May 28, 11:02 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, 1:14 PM EDT | Special Weather Statement | CTP | 91 min |
| Jun 2, 3:38 AM EDT | Special Weather Statement | CTP | 67 min |
| Jun 2, 1:20 PM EDT | Severe Thunderstorm Warning | CTP | 55 min |
| Jun 9, 4:40 AM EDT | Special Weather Statement | CTP | 65 min |
| Jun 9, 5:09 AM EDT | Severe Thunderstorm Warning | CTP | 66 min |
| Jun 9, 1:19 PM EDT | Severe Thunderstorm Warning | CTP | 41 min |
| Jun 9, 1:31 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jun 9, 1:54 PM EDT | Severe Thunderstorm Warning | CTP | 66 min |
| Jun 9, 3:34 PM EDT | Severe Thunderstorm Warning | CTP | 41 min |
| Jun 9, 3:40 PM EDT | Mesoscale Discussion | SPC | 65 min |
| Jun 9, 4:17 PM EDT | Special Weather Statement | CTP | 28 min |
| 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, 3:44 PM EDT | Special Weather Statement | CTP | 31 min |
| Jun 10, 4:20 PM EDT | Special Weather Statement | CTP | 25 min |
| Jun 10, 4:49 PM EDT | Severe Thunderstorm Warning | CTP | 56 min |
| Jun 10, 9:40 PM EDT | Areal Flood Advisory | CTP | 3 hr |
| Jun 10, 9:55 PM EDT | Flash Flood Warning | CTP | 4 hr |
| Jun 11, 4:04 AM EDT | Flash Flood Watch | CTP | 23 hr |
| Jun 11, 10:01 PM EDT | Mesoscale Discussion | SPC | 59 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, 6:42 PM EDT | Severe Thunderstorm Warning | CTP | 51 min |
| Jun 26, 7:33 PM EDT | Mesoscale Discussion | SPC | 57 min |
| Jun 30, 12:21 PM EDT | Special Weather Statement | CTP | 69 min |
| Jun 30, 12:27 PM EDT | Severe Thunderstorm Warning | CTP | 78 min |
| Jun 30, 1:14 PM EDT | Severe Thunderstorm Warning | CTP | 76 min |
| Jul 1, 12:03 PM EDT | Mesoscale Discussion | SPC | 87 min |
| Jul 2, 6:41 PM EDT | Special Weather Statement | CTP | 49 min |
| Jul 11, 3:52 PM EDT | Special Weather Statement | CTP | 53 min |
| Jul 11, 7:05 PM EDT | Severe Thunderstorm Warning | CTP | 40 min |
| Jul 11, 7:44 PM EDT | Special Weather Statement | CTP | 61 min |
| Jul 11, 8:38 PM EDT | Areal Flood Advisory | CTP | 3 hr |
| Jul 11, 9:06 PM EDT | Severe Thunderstorm Warning | CTP | 54 min |
| Jul 22, 4:37 PM EDT | Special Weather Statement | CTP | 38 min |
| Jul 22, 9:02 PM EDT | Areal Flood Advisory | CTP | 3 hr |
| Jul 23, 10:09 AM EDT | Areal Flood Advisory | CTP | 3 hr |
| Jul 23, 5:12 PM EDT | Special Weather Statement | CTP | 63 min |
| Jul 23, 7:25 PM EDT | Severe Thunderstorm Warning | CTP | 65 min |
| Jul 23, 7:35 PM EDT | Areal Flood Advisory | CTP | 3 hr |
| Jul 23, 8:16 PM EDT | Special Weather Statement | CTP | 59 min |
| Jul 24, 2:20 PM EDT | Mesoscale Discussion | SPC | 115 min |
| Jul 24, 3:20 PM EDT | Special Weather Statement | CTP | 40 min |
| Jul 24, 3:34 PM EDT | Mesoscale Discussion | SPC | 86 min |
| Jul 24, 4:16 PM EDT | Severe Thunderstorm Warning | CTP | 59 min |
| Jul 25, 6:36 AM EDT | Dense Fog Advisory | CTP | 3 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, 3:40 AM EDT | Flash Flood Watch | CTP | 16 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 29, 2:44 PM EDT | Special Weather Statement | CTP | 31 min |
| Jul 29, 3:03 PM EDT | Severe Thunderstorm Warning | CTP | 27 min |
| Jul 29, 5:05 PM EDT | Mesoscale Discussion | SPC | 55 min |
| Jul 29, 7:23 PM EDT | Severe Thunderstorm Warning | CTP | 97 min |
| Jul 31, 10:20 AM EDT | Mesoscale Discussion | SPC | 85 min |
| Aug 1, 4:05 AM EDT | Dense Fog Advisory | CTP | 5 hr |
| Aug 1, 6:15 PM EDT | Areal Flood Advisory | CTP | 79 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, 8:19 AM EDT | Areal Flood Advisory | CTP | 3 hr |
| Aug 2, 8:29 AM EDT | Severe Thunderstorm Warning | CTP | 61 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 9, 4:25 PM EDT | Severe Thunderstorm Warning | CTP | 65 min |
| Aug 9, 5:11 PM EDT | Severe Thunderstorm Warning | CTP | 49 min |
| Aug 9, 7:11 PM EDT | Mesoscale Discussion | SPC | 2 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, 9:53 PM EDT | Special Weather Statement | CTP | 22 min |
| Aug 11, 10:16 PM EDT | Special Weather Statement | CTP | 29 min |
| Aug 12, 12:36 PM EDT | Mesoscale Discussion | SPC | 84 min |
| Aug 12, 6:39 PM EDT | Areal Flood Advisory | CTP | 3 hr |
| Aug 12, 7:47 PM EDT | Areal Flood Advisory | CTP | 3 hr |
| Aug 13, 4:33 AM EDT | Flash Flood Watch | CTP | 15 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, 4:50 PM EDT | Severe Thunderstorm Warning | CTP | 55 min |
| Aug 18, 4:57 PM EDT | Severe Thunderstorm Warning | CTP | 78 min |
| Aug 18, 5:19 PM EDT | Special Weather Statement | CTP | 56 min |
| Aug 18, 5:35 PM EDT | Severe Thunderstorm Warning | CTP | 70 min |
| Aug 19, 1:21 PM EDT | Mesoscale Discussion | SPC | 84 min |
| Aug 19, 5:23 PM EDT | Special Weather Statement | CTP | 37 min |
| Aug 19, 5:33 PM EDT | Severe Thunderstorm Warning | CTP | 57 min |
| Aug 19, 6:31 PM EDT | Severe Thunderstorm Warning | CTP | 59 min |
| Aug 19, 6:49 PM EDT | Areal Flood Advisory | CTP | 3 hr |
| Aug 20, 1:43 PM EDT | Special Weather Statement | CTP | 62 min |
| Aug 20, 2:40 PM EDT | Severe Thunderstorm Warning | CTP | 50 min |
| Aug 20, 3:04 PM EDT | Tornado Warning | CTP | 26 min |
| Aug 20, 3:15 PM EDT | Severe Thunderstorm Warning | CTP | 60 min |
| Aug 20, 3:16 PM EDT | Special Weather Statement | CTP | 59 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, 12:15 PM EDT | Severe Thunderstorm Warning | CTP | 75 min |
| Aug 21, 12:21 PM EDT | Areal Flood Advisory | CTP | 114 min |
| Aug 29, 5:03 PM EDT | Special Weather Statement | CTP | 57 min |
| Sep 11, 12:05 PM EDT | Areal Flood Advisory | CTP | 4 hr |
| Sep 23, 8:49 PM EDT | Special Weather Statement | CTP | 26 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, 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, 9:50 AM EDT | Special Weather Statement | CTP | 25 min |
| Oct 24, 2:55 PM EDT | Areal Flood Advisory | CTP | 3 hr |
| Oct 24, 3:28 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 8, 6:12 AM EST | Winter Weather Advisory | CTP | 26 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, 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 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 | 31 |
| Tornado Warning | 1 |
| Severe Thunderstorm Watch | 9 |
| Mesoscale Discussion | 31 |
| Special Weather Statement | 28 |
| Flooding | |
| Flash Flood Warning | 1 |
| Flash Flood Watch | 4 |
| Flood Watch | 1 |
| Areal Flood Advisory | 24 |
| Winter | |
| Ice Storm Warning | 1 |
| Winter Storm Warning | 3 |
| Winter Storm Watch | 4 |
| Freezing Rain Advisory | 1 |
| Winter Weather Advisory | 7 |
| Heat | |
| Heat Advisory | 1 |
| Cold | |
| Freeze Warning | 1 |
| Freeze Watch | 1 |
| Frost Advisory | 4 |
| Wind and dust | |
| High Wind Warning | 1 |
| High Wind Watch | 2 |
| Wind Advisory | 7 |
| Fire | |
| Red Flag Warning | 2 |
| Fog and smoke | |
| Dense Fog Advisory | 7 |
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.