Alert archive / Pennsylvania / Flash Flood Watches in 2021
Flash Flood Watch 5, NWS State College, PA
NWS State College, PA issued this flash flood watch at Jul 16, 2021, 1:46 PM EDT for 18 counties in Pennsylvania. It took effect at Jul 16, 2021, 4:41 PM EDT. It was in force for 29 hr.
The area
The counties it named.
The facts
- Issued
- Jul 16, 2021, 1:46 PM EDT (17:46 UTC)
- In effect from
- Jul 16, 2021, 4:41 PM EDT
- Expired
- Jul 17, 2021, 9:18 PM EDT
- In force
- 29 hr
- Issued by
- NWS State College, PA
- Flood severity
- None
Counties Adams County, PA, Cameron County, PA, Clinton County, PA, Columbia County, PA, Dauphin County, PA, Elk County, PA, Lancaster County, PA, Lebanon County, PA, Lycoming County, PA, McKean County, PA, Montour County, PA, Northumberland County, PA, Potter County, PA, Schuylkill County, PA, Sullivan County, PA, Tioga County, PA, Warren County, PA, York County, PA
The radar
The State College radar (KCCX), 64 km from the middle of the area, began a volume at 17:46 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
The nearest sounding before it
Washington/Dulle, VA (KIAD), launched 12:00Z, 5.8 hours before the alert went out and 230 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 4 J/kg
- Mixed-layer CIN
- -127 J/kg
- Mixed-layer LCL
- 1491 m above ground
- 0-6 km bulk shear
- 17 kt
- 0-1 km storm-relative helicity
- -29 m²/s²
- 0-3 km storm-relative helicity
- 40 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
506 WGUS61 KCTP 161746 FFACTP URGENT - IMMEDIATE BROADCAST REQUESTED Flood Watch National Weather Service State College PA 146 PM EDT Fri Jul 16 2021 PAZ004>006-010>012-037-041-042-045-046-171200- /O.NEW.KCTP.FF.A.0005.210717T0200Z-210718T0200Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Warren-McKean-Potter-Elk-Cameron-Northern Clinton-Tioga-Northern Lycoming-Sullivan-Southern Clinton-Southern Lycoming- Including the cities of Bradford, St. Marys, Coudersport, Wellsboro, Renovo, Laporte, Lock Haven, Trout Run, Emporium, Williamsport, Mansfield, Ridgway, and Warren 146 PM EDT Fri Jul 16 2021 ...FLASH FLOOD WATCH IN EFFECT FROM 10 PM EDT THIS EVENING THROUGH SATURDAY EVENING... The National Weather Service in State College has issued a * Flash Flood Watch for a portion of central Pennsylvania, including the following areas, Cameron, Elk, McKean, Northern Clinton, Northern Lycoming, Potter, Southern Clinton, Southern Lycoming, Sullivan, Tioga and Warren. * From 10 PM EDT this evening through Saturday evening. * A slow moving front will focus rounds of locally heavy rainfall across the Watch area tonight and Saturday. Extremely wet soils will lead to rapid runoff and possible flash flooding in areas of heavy rain. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$ DeVoir
7 follow-up statements
869 WGUS61 KCTP 162041 FFACTP URGENT - IMMEDIATE BROADCAST REQUESTED Flood Watch National Weather Service State College PA 441 PM EDT Fri Jul 16 2021 PAZ051>053-171200- /O.EXB.KCTP.FF.A.0005.210716T2041Z-210718T0200Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Montour-Northumberland-Columbia- Including the cities of Shamokin, Berwick, Bloomsburg, Sunbury, and Danville 441 PM EDT Fri Jul 16 2021 ...FLASH FLOOD WATCH IN EFFECT THROUGH SATURDAY EVENING... The National Weather Service in State College has expanded the * Flash Flood Watch to include a portion of central Pennsylvania, including the following areas, Columbia, Montour and Northumberland. * Through Saturday evening. * A slow moving front will focus rounds of locally heavy rainfall across the Watch area tonight and Saturday. Extremely wet soils will lead to rapid runoff and possible flash flooding in areas of heavy rain. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$ PAZ004>006-010>012-037-041-042-045-046-171200- /O.EXT.KCTP.FF.A.0005.210716T2041Z-210718T0200Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Warren-McKean-Potter-Elk-Cameron-Northern Clinton-Tioga-Northern Lycoming-Sullivan-Southern Clinton-Southern Lycoming- Including the cities of Bradford, St. Marys, Coudersport, Wellsboro, Renovo, Laporte, Lock Haven, Trout Run, Emporium, Williamsport, Mansfield, Ridgway, and Warren 441 PM EDT Fri Jul 16 2021 ...FLASH FLOOD WATCH IN EFFECT THROUGH SATURDAY EVENING... The Flash Flood Watch is now in effect for * A portion of central Pennsylvania, including the following areas, Cameron, Elk, McKean, Northern Clinton, Northern Lycoming, Potter, Southern Clinton, Southern Lycoming, Sullivan, Tioga and Warren. * Through Saturday evening. * A slow moving front will focus rounds of locally heavy rainfall across the Watch area tonight and Saturday. Extremely wet soils will lead to rapid runoff and possible flash flooding in areas of heavy rain. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$ DeVoir/Guseman
204 WGUS61 KCTP 170323 FFACTP URGENT - IMMEDIATE BROADCAST REQUESTED Flood Watch National Weather Service State College PA 1123 PM EDT Fri Jul 16 2021 PAZ058-171600- /O.EXA.KCTP.FF.A.0005.000000T0000Z-210718T0200Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Schuylkill- Including the cities of Pottsville 1123 PM EDT Fri Jul 16 2021 ...FLASH FLOOD WATCH IN EFFECT THROUGH SATURDAY EVENING... The National Weather Service in State College has expanded the * Flash Flood Watch to include a portion of central Pennsylvania, including the following area, Schuylkill. * Through Saturday evening. * A slow moving front will focus rounds of locally heavy rainfall across the Watch area tonight and Saturday. Extremely wet soils will lead to rapid runoff and possible flash flooding in areas of heavy rain. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$ PAZ004>006-010>012-037-041-042-045-046-051>053-171600- /O.CON.KCTP.FF.A.0005.000000T0000Z-210718T0200Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Warren-McKean-Potter-Elk-Cameron-Northern Clinton-Tioga-Northern Lycoming-Sullivan-Southern Clinton-Southern Lycoming-Montour- Northumberland-Columbia- Including the cities of Bradford, St. Marys, Coudersport, Wellsboro, Renovo, Shamokin, Laporte, Sunbury, Lock Haven, Trout Run, Emporium, Williamsport, Mansfield, Ridgway, Danville, Bloomsburg, Berwick, and Warren 1123 PM EDT Fri Jul 16 2021 ...FLASH FLOOD WATCH REMAINS IN EFFECT THROUGH SATURDAY EVENING... The Flash Flood Watch continues for * A portion of central Pennsylvania, including the following areas, Cameron, Columbia, Elk, McKean, Montour, Northern Clinton, Northern Lycoming, Northumberland, Potter, Southern Clinton, Southern Lycoming, Sullivan, Tioga and Warren. * Through Saturday evening. * A slow moving front will focus rounds of locally heavy rainfall across the Watch area tonight and Saturday. Extremely wet soils will lead to rapid runoff and possible flash flooding in areas of heavy rain. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$ DeVoir/Guseman
633 WGUS61 KCTP 171140 FFACTP Flood Watch National Weather Service State College PA 740 AM EDT Sat Jul 17 2021 PAZ004>006-010>012-037-041-042-045-046-051>053-058-180200- /O.CON.KCTP.FF.A.0005.000000T0000Z-210718T0200Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Warren-McKean-Potter-Elk-Cameron-Northern Clinton-Tioga-Northern Lycoming-Sullivan-Southern Clinton-Southern Lycoming-Montour- Northumberland-Columbia-Schuylkill- Including the cities of Bradford, St. Marys, Coudersport, Wellsboro, Renovo, Shamokin, Laporte, Sunbury, Lock Haven, Trout Run, Emporium, Pottsville, Williamsport, Mansfield, Ridgway, Danville, Bloomsburg, Berwick, and Warren 740 AM EDT Sat Jul 17 2021 ...FLASH FLOOD WATCH REMAINS IN EFFECT THROUGH THIS EVENING... The Flash Flood Watch continues for * A portion of central Pennsylvania, including the following areas, Cameron, Columbia, Elk, McKean, Montour, Northern Clinton, Northern Lycoming, Northumberland, Potter, Schuylkill, Southern Clinton, Southern Lycoming, Sullivan, Tioga and Warren. * Through this evening. * A slow moving front will focus rounds of locally heavy rainfall from thunderstorms across the Watch area tonight and Saturday. Extremely wet soils will lead to rapid runoff and possible flash flooding in areas of heavy rain. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$ Lambert
733 WGUS61 KCTP 172237 FFACTP Flood Watch National Weather Service State College PA 637 PM EDT Sat Jul 17 2021 PAZ004>006-010>012-172345- /O.CAN.KCTP.FF.A.0005.000000T0000Z-210718T0200Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Warren-McKean-Potter-Elk-Cameron-Northern Clinton- Including the cities of Bradford, St. Marys, Coudersport, Renovo, Emporium, Ridgway, and Warren 637 PM EDT Sat Jul 17 2021 ...FLASH FLOOD WATCH IS CANCELLED... The Flash Flood Watch for a portion of central Pennsylvania, including the following areas, Cameron, Elk, McKean, Northern Clinton, Potter and Warren has been cancelled. The Flood Watch is cancelled. $$ PAZ037-041-042-045-046-051>053-058-180200- /O.CON.KCTP.FF.A.0005.000000T0000Z-210718T0200Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Tioga-Northern Lycoming-Sullivan-Southern Clinton-Southern Lycoming- Montour-Northumberland-Columbia-Schuylkill- Including the cities of Wellsboro, Shamokin, Laporte, Sunbury, Lock Haven, Trout Run, Pottsville, Williamsport, Mansfield, Danville, Bloomsburg, and Berwick 637 PM EDT Sat Jul 17 2021 ...FLASH FLOOD WATCH REMAINS IN EFFECT UNTIL 10 PM EDT THIS EVENING... The Flash Flood Watch continues for * A portion of central Pennsylvania, including the following areas, Columbia, Montour, Northern Lycoming, Northumberland, Schuylkill, Southern Clinton, Southern Lycoming, Sullivan and Tioga. * Until 10 PM EDT this evening. * A slow moving front will focus rounds of locally heavy rainfall from thunderstorms across the Watch area Saturday. Extremely wet soils will lead to rapid runoff and possible flash flooding in areas of heavy rain. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$ CR
218 WGUS61 KCTP 172240 FFACTP URGENT - IMMEDIATE BROADCAST REQUESTED Flood Watch National Weather Service State College PA 640 PM EDT Sat Jul 17 2021 PAZ057-059-064>066-180200- /O.EXA.KCTP.FF.A.0005.000000T0000Z-210718T0200Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Dauphin-Lebanon-Adams-York-Lancaster- Including the cities of Lancaster, Gettysburg, Lebanon, Hershey, Harrisburg, and York 640 PM EDT Sat Jul 17 2021 ...FLASH FLOOD WATCH IN EFFECT UNTIL 10 PM EDT THIS EVENING... The National Weather Service in State College has expanded the * Flash Flood Watch to include a portion of central Pennsylvania, including the following areas, Adams, Dauphin, Lancaster, Lebanon and York. * Until 10 PM EDT this evening. * A slow moving front will focus rounds of locally heavy rainfall from thunderstorms across the Watch area today. Extremely wet soils will lead to rapid runoff and possible flash flooding in areas of heavy rain. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$ PAZ037-041-042-045-046-051>053-058-180200- /O.CON.KCTP.FF.A.0005.000000T0000Z-210718T0200Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Tioga-Northern Lycoming-Sullivan-Southern Clinton-Southern Lycoming- Montour-Northumberland-Columbia-Schuylkill- Including the cities of Wellsboro, Shamokin, Laporte, Sunbury, Lock Haven, Trout Run, Pottsville, Williamsport, Mansfield, Danville, Bloomsburg, and Berwick 640 PM EDT Sat Jul 17 2021 ...FLASH FLOOD WATCH REMAINS IN EFFECT UNTIL 10 PM EDT THIS EVENING... The Flash Flood Watch continues for * A portion of central Pennsylvania, including the following areas, Columbia, Montour, Northern Lycoming, Northumberland, Schuylkill, Southern Clinton, Southern Lycoming, Sullivan and Tioga. * Until 10 PM EDT this evening. * A slow moving front will focus rounds of locally heavy rainfall from thunderstorms across the Watch area today. Extremely wet soils will lead to rapid runoff and possible flash flooding in areas of heavy rain. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$ CR
399 WGUS61 KCTP 180028 FFACTP Flood Watch National Weather Service State College PA 828 PM EDT Sat Jul 17 2021 PAZ037-041-042-045-180130- /O.CAN.KCTP.FF.A.0005.000000T0000Z-210718T0200Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Tioga-Northern Lycoming-Sullivan-Southern Clinton- Including the cities of Trout Run, Laporte, Mansfield, Wellsboro, and Lock Haven 828 PM EDT Sat Jul 17 2021 ...FLASH FLOOD WATCH IS CANCELLED... The Flash Flood Watch for a portion of central Pennsylvania, including the following areas, Northern Lycoming, Southern Clinton, Sullivan and Tioga has been cancelled. The Flood Watch is cancelled. $$ PAZ046-051>053-058-180200- /O.CON.KCTP.FF.A.0005.000000T0000Z-210718T0200Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Southern Lycoming-Montour-Northumberland-Columbia-Schuylkill- Including the cities of Shamokin, Sunbury, Pottsville, Williamsport, Bloomsburg, Danville, and Berwick 828 PM EDT Sat Jul 17 2021 ...FLASH FLOOD WATCH REMAINS IN EFFECT UNTIL 10 PM EDT THIS EVENING... The Flash Flood Watch continues for * A portion of central Pennsylvania, including the following areas, Columbia, Montour, Northumberland, Schuylkill and Southern Lycoming. * Until 10 PM EDT this evening. * A slow moving front will focus rounds of locally heavy rainfall from thunderstorms across the Watch area this evening. Extremely wet soils will lead to rapid runoff and possible flash flooding in areas of heavy rain. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$ PAZ057-059-064>066-180200- /O.CON.KCTP.FF.A.0005.000000T0000Z-210718T0200Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Dauphin-Lebanon-Adams-York-Lancaster- Including the cities of Lancaster, Gettysburg, Lebanon, Hershey, Harrisburg, and York 828 PM EDT Sat Jul 17 2021 ...FLASH FLOOD WATCH REMAINS IN EFFECT UNTIL 10 PM EDT THIS EVENING... The Flash Flood Watch continues for * A portion of central Pennsylvania, including the following areas, Adams, Dauphin, Lancaster, Lebanon and York. * Until 10 PM EDT this evening. * A slow moving front will focus rounds of locally heavy rainfall from thunderstorms across the Watch area this evening. Extremely wet soils will lead to rapid runoff and possible flash flooding in areas of heavy rain. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$ Guseman
054 WGUS61 KCTP 180118 FFACTP Flood Watch National Weather Service State College PA 918 PM EDT Sat Jul 17 2021 PAZ046-051>053-057>059-064>066-180230- /O.CAN.KCTP.FF.A.0005.000000T0000Z-210718T0200Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Southern Lycoming-Montour-Northumberland-Columbia-Dauphin-Schuylkill- Lebanon-Adams-York-Lancaster- Including the cities of Lancaster, Pottsville, Shamokin, Gettysburg, Lebanon, Sunbury, Hershey, Harrisburg, Williamsport, Bloomsburg, York, Danville, and Berwick 918 PM EDT Sat Jul 17 2021 ...FLASH FLOOD WATCH IS CANCELLED... The Flash Flood Watch for a portion of central Pennsylvania, including the following areas, Adams, Columbia, Dauphin, Lancaster, Lebanon, Montour, Northumberland, Schuylkill, Southern Lycoming and York has been cancelled. The Flood Watch is cancelled. Flooding is no longer expected to pose a threat. Please continue to heed remaining road closures. The Flood Watch is cancelled. Flooding is no longer expected to pose a threat. Please continue to heed remaining road closures. $$ Guseman/Banghoff
The office that day
Everything else NWS State College, PA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 15, 9:40 PM EDT | Special Weather Statement | CTP | Warren | 50 min |
| Jul 16, 1:22 PM EDT | Flood Watch | CTP | Cameron, Clinton, Elk, Lycoming, McKean, Potter and 3 more | 21 min |
| Jul 16, 1:59 PM EDT | Special Weather Statement | CTP | Montour | 31 min |
| Jul 16, 2:05 PM EDT | Areal Flood Advisory | CTP | Lycoming, Sullivan | 2 hr |
| Jul 16, 2:18 PM EDT | Severe Thunderstorm Warning | CTP | McKean, Potter | 42 min |
| Jul 16, 2:29 PM EDT | Special Weather Statement | CTP | Montour | 31 min |
| Jul 16, 2:52 PM EDT | Special Weather Statement | CTP | Potter | 23 min |
| Jul 16, 2:59 PM EDT | Areal Flood Advisory | CTP | Columbia, Montour, Northumberland | 2 hr |
| Jul 16, 2:59 PM EDT | Special Weather Statement | CTP | Columbia | 31 min |
| Jul 16, 3:14 PM EDT | Special Weather Statement | CTP | Potter | 31 min |
| Jul 16, 3:19 PM EDT | Special Weather Statement | CTP | Montour | 26 min |
| Jul 16, 3:22 PM EDT | Special Weather Statement | CTP | Juniata, Perry | 38 min |
| Jul 16, 3:54 PM EDT | Special Weather Statement | CTP | Clearfield | 36 min |
| Jul 16, 4:07 PM EDT | Special Weather Statement | CTP | Clearfield | 38 min |
| Jul 16, 4:11 PM EDT | Severe Thunderstorm Warning | CTP | Clearfield | 49 min |
| Jul 16, 4:18 PM EDT | Special Weather Statement | CTP | Tioga | 42 min |
| Jul 16, 4:20 PM EDT | Flash Flood Warning | CTP | Columbia, Montour, Northumberland, Union | 85 min |
| Jul 16, 4:29 PM EDT | Severe Thunderstorm Warning | CTP | Clearfield | 46 min |
| Jul 16, 4:30 PM EDT | Severe Thunderstorm Warning | CTP | Tioga | 45 min |
| Jul 16, 4:47 PM EDT | Severe Thunderstorm Warning | CTP | Lycoming | 43 min |
| Jul 16, 4:57 PM EDT | Special Weather Statement | CTP | Clinton | 33 min |
| Jul 16, 4:59 PM EDT | Areal Flood Advisory | CTP | Lycoming, Tioga | 2 hr |
| Jul 16, 5:10 PM EDT | Areal Flood Advisory | CTP | Sullivan | 3 hr |
| Jul 16, 5:13 PM EDT | Severe Thunderstorm Warning | CTP | Clinton, Lycoming | 32 min |
| Jul 16, 5:25 PM EDT | Special Weather Statement | CTP | Carbon | 20 min |
| Jul 16, 5:31 PM EDT | Flash Flood Warning | CTP | Sullivan | 108 min |
| Jul 16, 5:32 PM EDT | Special Weather Statement | CTP | Clinton | 28 min |
| Jul 16, 5:44 PM EDT | Special Weather Statement | CTP | Centre | 31 min |
| Jul 16, 6:01 PM EDT | Special Weather Statement | CTP | Centre | 29 min |
| Jul 16, 6:02 PM EDT | Severe Thunderstorm Warning | CTP | Sullivan | 45 min |
| Jul 16, 6:31 PM EDT | Special Weather Statement | CTP | Union | 29 min |
| Jul 16, 6:52 PM EDT | Special Weather Statement | CTP | Columbia | 23 min |
| Jul 16, 6:57 PM EDT | Special Weather Statement | CTP | Union | 33 min |
| Jul 16, 7:15 PM EDT | Areal Flood Advisory | CTP | Columbia, Lycoming, Montour, Northumberland, Snyder, Union | 2 hr |
Nearby
Flash Flood Watches in Pennsylvania, 2021Every flash flood watch in 2021
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.