Alert archive / Pennsylvania / Montgomery County / 2021
Weather alerts in Montgomery County, Pennsylvania, September 2021
38 weather alerts in September 2021, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
- Alerts
- 38
- Warnings
- 22
- Watches
- 4
- Advisories
- 3
- Busiest day
- September 1, 202113 alerts
Over time
By day
Days in UTC, the clock the archive keeps.
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 |
|---|---|---|---|
| Sep 1, 12:40 PM EDT | Tornado Watch | SPC | 9 hr |
| Sep 1, 2:53 PM EDT | Flash Flood Warning | PHI | 9 hr |
| Sep 1, 3:09 PM EDT | Mesoscale Discussion | SPC | 3 hr |
| Sep 1, 3:55 PM EDT | River Flood Warning | PHI | 36 hr |
| Sep 1, 3:55 PM EDT | River Flood Warning | PHI | 43 hr |
| Sep 1, 3:55 PM EDT | River Flood Warning | PHI | 41 hr |
| Sep 1, 4:12 PM EDT | Flash Flood Warning | PHI | 7 hr |
| Sep 1, 4:20 PM EDT | River Flood Warning | PHI | 22 hr |
| Sep 1, 4:42 PM EDT | Flash Flood Warning | PHI | 6 hr |
| Sep 1, 5:13 PM EDT | Severe Thunderstorm Warning | PHI | 47 min |
| Sep 1, 5:15 PM EDT | Tornado Warning | PHI | 30 min |
| Sep 1, 5:26 PM EDT | Flash Flood Warning | PHI | 9 hr |
| Sep 1, 5:34 PM EDT | Tornado Warning | PHI | 26 min |
| Sep 1, 10:42 PM EDT | Areal Flood Warning | PHI | 12 hr |
| Sep 1, 11:38 PM EDT | Areal Flood Warning | PHI | 10 hr |
| Sep 2, 2:23 AM EDT | Areal Flood Warning | PHI | 9 hr |
| Sep 2, 6:05 AM EDT | Coastal Flood Warning | PHI | 6 hr |
| Sep 7, 2:33 PM EDT | Flash Flood Watch | PHI | 37 hr |
| Sep 8, 7:54 PM EDT | Severe Thunderstorm Watch | SPC | 4 hr |
| Sep 8, 9:25 PM EDT | Mesoscale Discussion | SPC | 95 min |
| Sep 8, 10:42 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Sep 8, 10:47 PM EDT | Severe Thunderstorm Warning | PHI | 58 min |
| Sep 8, 11:35 PM EDT | Special Weather Statement | PHI | 40 min |
| Sep 9, 12:08 AM EDT | Special Weather Statement | PHI | 37 min |
| Sep 15, 7:36 PM EDT | Special Weather Statement | PHI | 24 min |
| Sep 22, 3:24 AM EDT | Flash Flood Watch | PHI | 41 hr |
| Sep 23, 10:30 AM EDT | Mesoscale Discussion | SPC | 2 hr |
| Sep 23, 11:33 AM EDT | Areal Flood Advisory | PHI | 3 hr |
| Sep 23, 11:40 AM EDT | Areal Flood Advisory | PHI | 3 hr |
| Sep 23, 12:12 PM EDT | Severe Thunderstorm Warning | PHI | 48 min |
| Sep 23, 12:28 PM EDT | Flash Flood Warning | PHI | 4 hr |
| Sep 23, 12:56 PM EDT | Areal Flood Advisory | PHI | 3 hr |
| Sep 23, 1:13 PM EDT | Severe Thunderstorm Warning | PHI | 47 min |
| Sep 23, 1:42 PM EDT | Flash Flood Warning | PHI | 4 hr |
| Sep 23, 4:26 PM EDT | Areal Flood Warning | PHI | 80 min |
| Sep 23, 7:18 PM EDT | Areal Flood Warning | PHI | 36 min |
| Sep 28, 9:23 AM EDT | Special Weather Statement | PHI | 37 min |
| Sep 28, 9:47 AM EDT | Special Weather Statement | PHI | 28 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 | 4 |
| Tornado Warning | 2 |
| Severe Thunderstorm Watch | 1 |
| Tornado Watch | 1 |
| Mesoscale Discussion | 4 |
| Special Weather Statement | 5 |
| Flooding | |
| Areal Flood Warning | 5 |
| Flash Flood Warning | 6 |
| River Flood Warning | 4 |
| Flash Flood Watch | 2 |
| Areal Flood Advisory | 3 |
| Coast and beach | |
| Coastal Flood Warning | 1 |
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20202022
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.