Alert archive / Pennsylvania / 1999
Weather alerts in Pennsylvania, September 1999
76 weather alerts in September 1999, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered any part of the state, so the counties below add up to more than the state.
Weather alerts by county
Each county as a circle sized by its count in September 1999. Tap one for its archive.
- Alerts
- 76
- Warnings
- 75
- Watches
- 1
- Advisories
- 0
- Busiest day
- September 16, 199921 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 | Counties | Lasted |
|---|---|---|---|---|
| Sep 5, 11:34 PM EDT | Flash Flood Warning | PHI | Chester | 14 hr |
| Sep 6, 2:37 PM EDT | Severe Thunderstorm Warning | CTP | Cambria | 53 min |
| Sep 6, 2:45 PM EDT | Severe Thunderstorm Warning | CTP | Bedford | 60 min |
| Sep 6, 3:01 PM EDT | Flash Flood Warning | CTP | Franklin, Fulton | 3 hr |
| Sep 6, 3:01 PM EDT | Flash Flood Warning | CTP | Bedford, Cambria, Somerset | 3 hr |
| Sep 6, 3:27 PM EDT | Severe Thunderstorm Warning | CTP | Cambria | 48 min |
| Sep 6, 3:56 PM EDT | Severe Thunderstorm Warning | CTP | Lancaster, York | 64 min |
| Sep 6, 4:17 PM EDT | Flash Flood Warning | CTP | Lancaster, York | 3 hr |
| Sep 6, 4:32 PM EDT | Severe Thunderstorm Warning | CTP | Dauphin, Perry | 58 min |
| Sep 6, 9:07 PM EDT | Flash Flood Warning | CTP | Cumberland, Dauphin, Perry, York | 3 hr |
| Sep 6, 11:37 PM EDT | Flash Flood Warning | CTP | Lycoming, Snyder, Union | 3 hr |
| Sep 6, 11:47 PM EDT | Flash Flood Warning | CTP | Cumberland, Dauphin, York | 3 hr |
| Sep 6, 11:47 PM EDT | Flash Flood Warning | CTP | Perry | 3 hr |
| Sep 7, 2:06 AM EDT | Flash Flood Warning | CTP | Northumberland | 3 hr |
| Sep 7, 2:25 AM EDT | Flash Flood Warning | CTP | Perry, Snyder, Union | 4 hr |
| Sep 7, 2:25 AM EDT | Flash Flood Warning | CTP | Dauphin, York | 4 hr |
| Sep 7, 2:25 AM EDT | Flash Flood Warning | CTP | Lycoming | 4 hr |
| Sep 7, 3:45 AM EDT | Flash Flood Warning | CTP | Tioga | 2 hr |
| Sep 7, 4:10 AM EDT | Flash Flood Warning | PHI | Berks | 3 hr |
| Sep 9, 4:01 PM EDT | Severe Thunderstorm Warning | PBZ | Venango | 59 min |
| Sep 9, 4:38 PM EDT | Severe Thunderstorm Warning | PBZ | Forest | 52 min |
| Sep 9, 5:08 PM EDT | Severe Thunderstorm Warning | CTP | McKean, Warren | 67 min |
| Sep 9, 5:09 PM EDT | Severe Thunderstorm Warning | PHI | Berks | 51 min |
| Sep 9, 5:54 PM EDT | Flash Flood Warning | CTP | Lancaster | 3 hr |
| Sep 9, 6:01 PM EDT | Tornado Warning | CTP | McKean | 29 min |
| Sep 9, 6:10 PM EDT | Flash Flood Warning | CTP | York | 3 hr |
| Sep 9, 7:17 PM EDT | Flash Flood Warning | PHI | Monroe, Northampton | 3 hr |
| Sep 9, 7:17 PM EDT | Flash Flood Warning | PHI | Berks | 3 hr |
| Sep 9, 8:58 PM EDT | Flash Flood Warning | CTP | Lancaster, York | 3 hr |
| Sep 9, 10:45 PM EDT | Flash Flood Warning | CTP | Union | 3 hr |
| Sep 16, 8:37 AM EDT | Flash Flood Warning | PHI | Chester, Delaware, Philadelphia | 4 hr |
| Sep 16, 9:00 AM EDT | Flash Flood Warning | CTP | Dauphin, Lebanon, Schuylkill | 6 hr |
| Sep 16, 9:00 AM EDT | Flash Flood Warning | CTP | Lancaster, York | 6 hr |
| Sep 16, 9:00 AM EDT | Flash Flood Warning | CTP | Adams, Cumberland, Perry | 6 hr |
| Sep 16, 9:25 AM EDT | Flash Flood Warning | PHI | Bucks, Montgomery | 6 hr |
| Sep 16, 11:25 AM EDT | Flash Flood Warning | PHI | Delaware, Philadelphia | 6 hr |
| Sep 16, 11:25 AM EDT | Flash Flood Warning | PHI | Chester | 6 hr |
| Sep 16, 12:11 PM EDT | Flash Flood Warning | PHI | Berks, Lehigh | 5 hr |
| Sep 16, 12:11 PM EDT | Flash Flood Warning | PHI | Northampton | 5 hr |
| Sep 16, 2:15 PM EDT | Flash Flood Warning | CTP | Adams, Cumberland, Dauphin, Lancaster, York | 7 hr |
| Sep 16, 2:15 PM EDT | Flash Flood Warning | CTP | Perry | 7 hr |
| Sep 16, 2:15 PM EDT | Flash Flood Warning | CTP | Lebanon, Schuylkill | 7 hr |
| Sep 16, 2:41 PM EDT | Flash Flood Warning | PHI | Bucks, Chester, Delaware, Montgomery, Philadelphia | 6 hr |
| Sep 16, 3:21 PM EDT | Flash Flood Warning | PHI | Carbon, Monroe | 6 hr |
| Sep 16, 4:21 PM EDT | Flash Flood Warning | PHI | Northampton | 5 hr |
| Sep 16, 4:21 PM EDT | Flash Flood Warning | PHI | Berks, Lehigh | 5 hr |
| Sep 16, 4:35 PM EDT | Flash Flood Warning | CTP | Columbia, Lycoming, Montour, Northumberland, Union | 3 hr |
| Sep 16, 4:35 PM EDT | Flash Flood Warning | CTP | Snyder | 3 hr |
| Sep 16, 5:15 PM EDT | Flash Flood Warning | BGM | Lackawanna, Luzerne | 5 hr |
| Sep 16, 5:15 PM EDT | Flash Flood Warning | BGM | Pike, Wayne | 5 hr |
| Sep 16, 7:30 PM EDT | Flash Flood Warning | CTP | Snyder, Union | 90 min |
| Sep 16, 9:59 PM EDT | Flash Flood Warning | BGM | Pike | 6 hr |
| Sep 16, 9:59 PM EDT | Flash Flood Warning | BGM | Lackawanna, Luzerne, Wayne | 6 hr |
| Sep 29, 3:18 PM EDT | Severe Thunderstorm Warning | PBZ | Washington | 57 min |
| Sep 29, 3:35 PM EDT | Severe Thunderstorm Warning | PBZ | Allegheny | 55 min |
| Sep 29, 3:45 PM EDT | Tornado Watch | SPC | Allegheny, Armstrong, Beaver, Bedford, Blair, Butler and 20 more | 6 hr |
| Sep 29, 4:06 PM EDT | Severe Thunderstorm Warning | PBZ | Beaver | 54 min |
| Sep 29, 4:20 PM EDT | Severe Thunderstorm Warning | PBZ | Butler | 55 min |
| Sep 29, 4:29 PM EDT | Severe Thunderstorm Warning | PBZ | Lawrence | 61 min |
| Sep 29, 4:49 PM EDT | Severe Thunderstorm Warning | CLE | Crawford, Erie | 61 min |
| Sep 29, 4:51 PM EDT | Severe Thunderstorm Warning | PBZ | Mercer | 54 min |
| Sep 29, 4:57 PM EDT | Severe Thunderstorm Warning | PBZ | Venango | 63 min |
| Sep 29, 5:13 PM EDT | Severe Thunderstorm Warning | CTP | Warren | 62 min |
| Sep 29, 6:02 PM EDT | Severe Thunderstorm Warning | PBZ | Armstrong | 58 min |
| Sep 29, 10:06 PM EDT | Severe Thunderstorm Warning | CTP | Blair, Cambria, Centre, Clearfield | 54 min |
| Sep 29, 10:06 PM EDT | Severe Thunderstorm Warning | CTP | Cameron | 54 min |
| Sep 29, 10:27 PM EDT | Severe Thunderstorm Warning | CTP | Clinton, Potter | 78 min |
| Sep 29, 11:43 PM EDT | Severe Thunderstorm Warning | CTP | Clinton | 47 min |
| Sep 29, 11:46 PM EDT | Severe Thunderstorm Warning | CTP | Clinton | 44 min |
| Sep 30, 12:09 AM EDT | Severe Thunderstorm Warning | CTP | Juniata, Snyder | 51 min |
| Sep 30, 12:09 AM EDT | Severe Thunderstorm Warning | CTP | Juniata, Snyder | 66 min |
| Sep 30, 12:35 AM EDT | Severe Thunderstorm Warning | CTP | Cumberland, Dauphin | 40 min |
| Sep 30, 1:01 AM EDT | Severe Thunderstorm Warning | CTP | Columbia, Lycoming, Sullivan | 59 min |
| Sep 30, 1:01 AM EDT | Severe Thunderstorm Warning | CTP | Montour, Northumberland | 59 min |
| Sep 30, 1:02 AM EDT | Severe Thunderstorm Warning | CTP | Lebanon, Schuylkill | 43 min |
| Sep 30, 1:25 AM EDT | Flash Flood Warning | CTP | Snyder, Union | 3 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 | 30 |
| Tornado Warning | 1 |
| Tornado Watch | 1 |
| Flooding | |
| Flash Flood Warning | 44 |
By county
Every county with at least one alert. A county page lists each alert that covered it.
- York County9
- Dauphin County7
- Snyder County7
- Lancaster County6
- Perry County6
- Union County6
- Cambria County5
- Cumberland County5
- Berks County5
- Chester County4
- Lycoming County4
- Bedford County3
- Northumberland County3
- Venango County3
- McKean County3
- Warren County3
- Northampton County3
- Delaware County3
- Philadelphia County3
- Lebanon County3
- Schuylkill County3
- Clinton County3
- Somerset County2
- Forest County2
- Monroe County2
- Adams County2
- Bucks County2
- Montgomery County2
- Lehigh County2
- Columbia County2
- Montour County2
- Lackawanna County2
- Luzerne County2
- Pike County2
- Wayne County2
- Washington County2
- Allegheny County2
- Armstrong County2
- Beaver County2
- Blair County2
22 more counties
- Butler County2
- Cameron County2
- Clearfield County2
- Crawford County2
- Erie County2
- Lawrence County2
- Mercer County2
- Juniata County2
- Franklin County1
- Fulton County1
- Tioga County1
- Carbon County1
- Clarion County1
- Elk County1
- Fayette County1
- Greene County1
- Indiana County1
- Jefferson County1
- Westmoreland County1
- Centre County1
- Potter County1
- Sullivan County1
Nearby
Alerts in force nowTornadoes on recordThe radar archive19982000
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. Rebuilt daily.