Alert archive / Pennsylvania / Monroe County
Weather alerts in Monroe County, Pennsylvania, 2009
131 weather alerts in 2009, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Monroe County and its neighbors
Each county as a circle sized by its count in 2009. Tap one for its archive.
- Alerts
- 131
- Warnings
- 38
- Watches
- 27
- Advisories
- 37
- Busiest month
- August30 alerts
- Busiest day
- July 29, 200911 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 Monroe County in 2009 had a tornado report inside them; 0 of 1 tornado reports fell inside a warning.
Monroe County, 2009
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 1 | 0 | 100% | 1 | 0% | |
| Severe thunderstorm warnings | 20 | 8 | 60% | 4 | 25% | 2 min |
| Flash flood warnings | 6 | 1 | 83% | 2 | 0% |
Each office's whole area, 2009
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Philadelphia/Mount Holly: tornado warnings | 13 | 1 | 92% | 2 | 50% | 38 min |
| NWS Philadelphia/Mount Holly: severe thunderstorm warnings | 235 | 113 | 52% | 260 | 82% | 26 min |
| NWS Philadelphia/Mount Holly: flash flood warnings | 67 | 20 | 70% | 69 | 62% | 85 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, 3:46 AM EST | Winter Storm Watch | PHI | 25 hr |
| Jan 6, 4:39 AM EST | Winter Storm Warning | PHI | 16 hr |
| Jan 6, 8:55 PM EST | Ice Storm Warning | PHI | 19 hr |
| Jan 7, 12:10 AM EST | Mesoscale Discussion | SPC | 4 hr |
| Jan 7, 6:08 AM EST | Mesoscale Discussion | SPC | 3 hr |
| Jan 9, 4:19 AM EST | Winter Storm Watch | PHI | 11 hr |
| Jan 9, 3:27 PM EST | Winter Storm Warning | PHI | 37 hr |
| Jan 10, 7:58 PM EST | Mesoscale Discussion | SPC | 4 hr |
| Jan 14, 3:34 PM EST | Winter Weather Advisory | PHI | 17 hr |
| Jan 15, 3:52 PM EST | Wind Chill Advisory | PHI | 42 hr |
| Jan 26, 2:42 AM EST | Winter Storm Watch | PHI | 25 hr |
| Jan 27, 3:18 AM EST | Winter Storm Warning | PHI | 40 hr |
| Jan 28, 12:31 AM EST | Mesoscale Discussion | SPC | 5 hr |
| Jan 28, 7:53 AM EST | Mesoscale Discussion | SPC | 5 hr |
| Feb 2, 2:53 PM EST | Winter Weather Advisory | PHI | 37 hr |
| Feb 11, 2:50 PM EST | Wind Advisory | PHI | 13 hr |
| Feb 12, 3:30 AM EST | High Wind Warning | PHI | 16 hr |
| Feb 12, 6:51 PM EST | Wind Advisory | PHI | 5 hr |
| Feb 18, 2:58 PM EST | Freezing Rain Advisory | PHI | 77 min |
| Feb 18, 4:12 PM EST | Winter Weather Advisory | PHI | 11 hr |
| Mar 1, 3:30 AM EST | Winter Storm Warning | PHI | 37 hr |
| Mar 2, 3:45 AM EST | Winter Weather Advisory | PHI | 12 hr |
| Mar 23, 4:23 AM EDT | Red Flag Warning | PHI | 19 hr |
| Apr 3, 3:08 PM EDT | Wind Advisory | PHI | 29 hr |
| Apr 28, 10:34 AM EDT | Red Flag Warning | PHI | 9 hr |
| May 12, 2:34 AM EDT | Frost Advisory | PHI | 30 hr |
| May 15, 3:04 AM EDT | Dense Fog Advisory | PHI | 5 hr |
| May 16, 6:29 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| May 16, 9:37 PM EDT | Areal Flood Advisory | PHI | 110 min |
| May 18, 4:27 AM EDT | Freeze Warning | PHI | 28 hr |
| May 24, 11:49 AM EDT | Mesoscale Discussion | SPC | 116 min |
| May 24, 2:15 PM EDT | Severe Thunderstorm Warning | PHI | 45 min |
| May 24, 2:26 PM EDT | Areal Flood Advisory | PHI | 107 min |
| May 24, 5:16 PM EDT | Severe Thunderstorm Warning | PHI | 59 min |
| May 31, 1:55 PM EDT | Frost Advisory | PHI | 17 hr |
| Jun 9, 6:01 AM EDT | Mesoscale Discussion | SPC | 59 min |
| Jun 9, 1:31 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jun 9, 3:40 PM EDT | Mesoscale Discussion | SPC | 65 min |
| Jun 11, 3:15 PM EDT | Flash Flood Watch | PHI | 13 hr |
| Jun 13, 2:33 PM EDT | Flash Flood Warning | PHI | 112 min |
| Jun 13, 6:39 PM EDT | Severe Thunderstorm Warning | PHI | 66 min |
| Jun 13, 7:29 PM EDT | Severe Thunderstorm Warning | PHI | 61 min |
| Jun 25, 5:30 PM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Jun 25, 8:21 PM EDT | Mesoscale Discussion | SPC | 54 min |
| 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, 3:31 PM EDT | Severe Thunderstorm Warning | PHI | 59 min |
| Jun 26, 3:53 PM EDT | Severe Thunderstorm Warning | PHI | 82 min |
| Jun 26, 4:51 PM EDT | Severe Thunderstorm Warning | PHI | 69 min |
| Jun 30, 10:57 AM EDT | Mesoscale Discussion | SPC | 93 min |
| Jun 30, 11:37 AM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 30, 2:18 PM EDT | Mesoscale Discussion | SPC | 57 min |
| Jul 1, 12:03 PM EDT | Mesoscale Discussion | SPC | 87 min |
| Jul 7, 11:05 AM EDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jul 7, 2:00 PM EDT | Mesoscale Discussion | SPC | 90 min |
| Jul 11, 9:05 PM EDT | Areal Flood Advisory | PHI | 4 hr |
| Jul 16, 3:53 PM EDT | Severe Thunderstorm Warning | PHI | 31 min |
| Jul 16, 4:04 PM EDT | Mesoscale Discussion | SPC | 86 min |
| Jul 16, 4:55 PM EDT | Mesoscale Discussion | SPC | 65 min |
| Jul 17, 9:17 PM EDT | Areal Flood Advisory | PHI | 3 hr |
| Jul 25, 7:51 PM EDT | Severe Thunderstorm Warning | PHI | 75 min |
| Jul 26, 3:07 AM EDT | Flash Flood Watch | PHI | 20 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, 12:12 PM EDT | Severe Thunderstorm Warning | PHI | 78 min |
| Jul 29, 12:22 PM EDT | Mesoscale Discussion | SPC | 23 min |
| Jul 29, 12:49 PM EDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jul 29, 1:51 PM EDT | Flash Flood Warning | PHI | 9 hr |
| Jul 29, 1:56 PM EDT | Severe Thunderstorm Warning | PHI | 64 min |
| Jul 29, 2:04 PM EDT | Severe Thunderstorm Warning | PHI | 56 min |
| Jul 29, 2:11 PM EDT | Tornado Warning | PHI | 34 min |
| Jul 29, 2:22 PM EDT | Mesoscale Discussion | SPC | 23 min |
| Jul 29, 2:32 PM EDT | Flash Flood Warning | PHI | 6 hr |
| Jul 29, 5:05 PM EDT | Mesoscale Discussion | SPC | 55 min |
| Jul 29, 7:14 PM EDT | Mesoscale Discussion | SPC | 61 min |
| Jul 30, 3:30 PM EDT | Flash Flood Watch | PHI | 27 hr |
| Jul 31, 10:20 AM EDT | Mesoscale Discussion | SPC | 85 min |
| Jul 31, 1:18 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 31, 2:13 PM EDT | Flash Flood Warning | PHI | 4 hr |
| Aug 2, 2:19 AM EDT | Flash Flood Watch | PHI | 13 hr |
| Aug 2, 9:06 AM EDT | Flash Flood Warning | PHI | 4 hr |
| Aug 2, 4:06 PM EDT | Areal Flood Advisory | PHI | 4 hr |
| Aug 9, 11:57 AM EDT | Flash Flood Watch | PHI | 11 hr |
| Aug 9, 2:45 PM EDT | Mesoscale Discussion | SPC | 60 min |
| Aug 9, 3:18 PM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Aug 9, 4:30 PM EDT | Severe Thunderstorm Warning | PHI | 90 min |
| Aug 9, 7:11 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 10, 4:40 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, 3:47 PM EDT | Severe Thunderstorm Warning | PHI | 43 min |
| Aug 11, 4:19 PM EDT | Severe Thunderstorm Warning | PHI | 34 min |
| Aug 12, 6:03 PM EDT | Areal Flood Advisory | PHI | 4 hr |
| Aug 12, 6:52 PM EDT | Areal Flood Advisory | PHI | 3 hr |
| Aug 13, 3:36 AM EDT | Flood Watch | PHI | 36 min |
| Aug 13, 4:12 AM EDT | Flash Flood Watch | PHI | 15 hr |
| Aug 14, 2:37 PM EDT | Areal Flood Advisory | PHI | 113 min |
| Aug 19, 1:21 PM EDT | Mesoscale Discussion | SPC | 84 min |
| Aug 19, 4:30 PM EDT | Areal Flood Advisory | PHI | 2 hr |
| Aug 19, 4:35 PM EDT | Severe Thunderstorm Warning | PHI | 55 min |
| Aug 19, 5:04 PM EDT | Flash Flood Warning | PHI | 115 min |
| Aug 21, 10:01 AM EDT | Mesoscale Discussion | SPC | 119 min |
| Aug 21, 11:28 AM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Aug 21, 12:55 PM EDT | Severe Thunderstorm Warning | PHI | 35 min |
| Aug 21, 1:29 PM EDT | Severe Thunderstorm Warning | PHI | 76 min |
| Aug 21, 1:55 PM EDT | Severe Thunderstorm Warning | PHI | 65 min |
| Aug 21, 2:41 PM EDT | Areal Flood Advisory | PHI | 3 hr |
| Aug 21, 2:47 PM EDT | Flash Flood Watch | PHI | 35 hr |
| Aug 28, 2:52 PM EDT | Flash Flood Watch | PHI | 14 hr |
| Sep 12, 2:21 AM EDT | Areal Flood Advisory | PHI | 3 hr |
| Sep 19, 3:27 PM EDT | Frost Advisory | PHI | 17 hr |
| Oct 6, 3:19 PM EDT | Wind Advisory | PHI | 29 hr |
| Oct 10, 2:57 AM EDT | Frost Advisory | PHI | 29 hr |
| Oct 10, 2:27 PM EDT | Freeze Watch | PHI | 15 hr |
| Oct 11, 2:33 AM EDT | Freeze Warning | PHI | 29 hr |
| Oct 15, 4:03 AM EDT | Winter Weather Advisory | PHI | 31 hr |
| Oct 16, 3:40 PM EDT | Winter Storm Watch | PHI | 12 hr |
| Oct 17, 3:15 AM EDT | Winter Weather Advisory | PHI | 24 hr |
| Oct 24, 3:30 PM EDT | Areal Flood Advisory | PHI | 4 hr |
| Nov 27, 3:16 PM EST | Wind Advisory | PHI | 24 hr |
| Dec 3, 5:41 AM EST | Severe Thunderstorm Warning | PHI | 49 min |
| Dec 5, 3:25 AM EST | Winter Weather Advisory | PHI | 19 hr |
| Dec 8, 3:05 AM EST | Winter Weather Advisory | PHI | 30 hr |
| Dec 8, 2:40 PM EST | Flash Flood Watch | PHI | 21 hr |
| Dec 9, 12:00 PM EST | Wind Advisory | PHI | 33 hr |
| Dec 12, 2:29 PM EST | Winter Weather Advisory | PHI | 23 hr |
| Dec 13, 1:50 PM EST | Freezing Rain Advisory | PHI | 4 hr |
| Dec 17, 3:30 PM EST | Winter Storm Watch | PHI | 22 hr |
| Dec 18, 4:40 AM EST | Winter Storm Warning | PHI | 46 hr |
| Dec 24, 3:04 PM EST | Freezing Rain Advisory | PHI | 42 hr |
| Dec 28, 1:42 PM EST | Wind Advisory | PHI | 27 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 | 20 |
| Tornado Warning | 1 |
| Severe Thunderstorm Watch | 11 |
| Mesoscale Discussion | 29 |
| Flooding | |
| Flash Flood Warning | 6 |
| Flash Flood Watch | 9 |
| Flood Watch | 1 |
| Areal Flood Advisory | 12 |
| Winter | |
| Ice Storm Warning | 1 |
| Winter Storm Warning | 5 |
| Winter Storm Watch | 5 |
| Freezing Rain Advisory | 3 |
| Winter Weather Advisory | 9 |
| Cold | |
| Freeze Warning | 2 |
| Freeze Watch | 1 |
| Frost Advisory | 4 |
| Wind Chill Advisory | 1 |
| Wind and dust | |
| High Wind Warning | 1 |
| Wind Advisory | 7 |
| Fire | |
| Red Flag Warning | 2 |
| Fog and smoke | |
| Dense Fog Advisory | 1 |
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.