Alert archive / Pennsylvania / Flash Flood Watches in 2021
Flash Flood Watch 3, NWS State College, PA
NWS State College, PA issued this flash flood watch at Jul 12, 2021, 1:21 PM EDT for 18 counties in Pennsylvania. It took effect at Jul 12, 2021, 1:36 PM EDT. It was in force for 12 hr.
The area
The counties it named.
The facts
- Issued
- Jul 12, 2021, 1:21 PM EDT (17:21 UTC)
- In effect from
- Jul 12, 2021, 1:36 PM EDT
- Expired
- Jul 13, 2021, 2:00 AM EDT
- In force
- 12 hr
- Issued by
- NWS State College, PA
- Flood severity
- None
Counties Columbia County, PA, Cumberland County, PA, Dauphin County, PA, Juniata County, PA, Lebanon County, PA, Lycoming County, PA, McKean County, PA, Montour County, PA, Northumberland County, PA, Perry County, PA, Potter County, PA, Schuylkill County, PA, Snyder County, PA, Sullivan County, PA, Tioga County, PA, Union County, PA, Warren County, PA, York County, PA
The radar
The State College radar (KCCX), 72 km from the middle of the area, began a volume at 17:22 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, 5.4 hours before the alert went out and 223 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
- 974 J/kg
- Mixed-layer CIN
- -83 J/kg
- Mixed-layer LCL
- 724 m above ground
- 0-6 km bulk shear
- 21 kt
- 0-1 km storm-relative helicity
- 10 m²/s²
- 0-3 km storm-relative helicity
- 53 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 0.8
The text
As transmitted.
267 WGUS61 KCTP 121721 FFACTP URGENT - IMMEDIATE BROADCAST REQUESTED Flood Watch National Weather Service State College PA 121 PM EDT Mon Jul 12 2021 .Slow moving thunderstorms will impact the region this afternoon and tonight. Locations in the watch have received multiple rounds of heavy rain over the past several days and are prone to flash flooding from new rainfall amounts of just 1.50 inches or less during a 3 hour period. PAZ028-037-041-042-046-049>053-056>059-063-065-130600- /O.NEW.KCTP.FF.A.0003.210712T1900Z-210713T0600Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Juniata-Tioga-Northern Lycoming-Sullivan-Southern Lycoming-Union- Snyder-Montour-Northumberland-Columbia-Perry-Dauphin-Schuylkill- Lebanon-Cumberland-York- Including the cities of Newport, Trout Run, Selinsgrove, Wellsboro, Shamokin, Laporte, Lebanon, Sunbury, Hershey, Mifflintown, Harrisburg, Pottsville, Williamsport, Mansfield, York, Danville, Bloomsburg, Berwick, Lewisburg, and Carlisle 121 PM EDT Mon Jul 12 2021 ...FLASH FLOOD WATCH IN EFFECT THROUGH LATE TONIGHT... The National Weather Service in State College has issued a * Flash Flood Watch for a portion of central Pennsylvania, including the following areas, Columbia, Cumberland, Dauphin, Juniata, Lebanon, Montour, Northern Lycoming, Northumberland, Perry, Schuylkill, Snyder, Southern Lycoming, Sullivan, Tioga, Union and York. * Through late tonight. * Excessive rain from multiple thunderstorms. Rainfall could total 2 to 3 inches in some locations. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$ Lambert/Travis
2 follow-up statements
469 WGUS61 KCTP 121736 FFACTP URGENT - IMMEDIATE BROADCAST REQUESTED Flood Watch National Weather Service State College PA 136 PM EDT Mon Jul 12 2021 .Slow moving thunderstorms will impact the region this afternoon and tonight. Locations in the watch have received multiple rounds of heavy rain over the past several days and are prone to flash flooding from new rainfall amounts of just 1.25 and 1.50 inches over a 1 and 3 hour period respectively. during a 3 hour period. PAZ004>006-130300- /O.EXB.KCTP.FF.A.0003.210712T1736Z-210713T0300Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Warren-McKean-Potter- Including the cities of Bradford, Coudersport, and Warren 136 PM EDT Mon Jul 12 2021 ...FLASH FLOOD WATCH IN EFFECT UNTIL 11 PM EDT THIS EVENING... The National Weather Service in State College has expanded the * Flash Flood Watch to include a portion of central Pennsylvania, including the following areas, McKean, Potter and Warren. * Until 11 PM EDT this evening. * Excessive rain from multiple thunderstorms. Rainfall could total 2 to 3 inches in some locations. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$ PAZ028-037-041-042-046-049>053-056>059-063-065-130315- /O.CON.KCTP.FF.A.0003.210712T1900Z-210713T0600Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Juniata-Tioga-Northern Lycoming-Sullivan-Southern Lycoming-Union- Snyder-Montour-Northumberland-Columbia-Perry-Dauphin-Schuylkill- Lebanon-Cumberland-York- Including the cities of Newport, Trout Run, Selinsgrove, Wellsboro, Shamokin, Laporte, Lebanon, Sunbury, Hershey, Mifflintown, Harrisburg, Pottsville, Williamsport, Mansfield, York, Danville, Bloomsburg, Berwick, Lewisburg, and Carlisle 136 PM EDT Mon Jul 12 2021 ...FLASH FLOOD WATCH REMAINS IN EFFECT THROUGH LATE TONIGHT... The Flash Flood Watch continues for * A portion of central Pennsylvania, including the following areas, Columbia, Cumberland, Dauphin, Juniata, Lebanon, Montour, Northern Lycoming, Northumberland, Perry, Schuylkill, Snyder, Southern Lycoming, Sullivan, Tioga, Union and York. * Through late tonight. * Excessive rain from multiple thunderstorms. Rainfall could total 2 to 3 inches in some locations. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$ Lambert/Devoir
019 WGUS61 KCTP 130311 FFACTP Flood Watch National Weather Service State College PA 1111 PM EDT Mon Jul 12 2021 PAZ004>006-130415- /O.EXP.KCTP.FF.A.0003.000000T0000Z-210713T0300Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Warren-McKean-Potter- Including the cities of Bradford, Coudersport, and Warren 1111 PM EDT Mon Jul 12 2021 ...FLASH FLOOD WATCH HAS EXPIRED... The Flash Flood Watch for a portion of central Pennsylvania, including the following areas, McKean, Potter and Warren has expired. Flooding is no longer expected to pose a threat. $$ PAZ028-037-041-042-046-049>053-056>059-063-065-130600- /O.CON.KCTP.FF.A.0003.000000T0000Z-210713T0600Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Juniata-Tioga-Northern Lycoming-Sullivan-Southern Lycoming-Union- Snyder-Montour-Northumberland-Columbia-Perry-Dauphin-Schuylkill- Lebanon-Cumberland-York- Including the cities of Newport, Trout Run, Selinsgrove, Wellsboro, Shamokin, Laporte, Lebanon, Sunbury, Hershey, Mifflintown, Harrisburg, Pottsville, Williamsport, Mansfield, York, Danville, Bloomsburg, Berwick, Lewisburg, and Carlisle 1111 PM EDT Mon Jul 12 2021 ...FLASH FLOOD WATCH REMAINS IN EFFECT UNTIL 2 AM EDT TUESDAY... The Flash Flood Watch continues for * A portion of central Pennsylvania, including the following areas, Columbia, Cumberland, Dauphin, Juniata, Lebanon, Montour, Northern Lycoming, Northumberland, Perry, Schuylkill, Snyder, Southern Lycoming, Sullivan, Tioga, Union and York. * Until 2 AM EDT Tuesday. * Localized downpours remain possible in the Watch area. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$ Evanego
The office that day
Everything else NWS State College, PA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 11, 8:03 PM EDT | Severe Thunderstorm Warning | CTP | Clinton, Columbia, Lycoming, Montour, Northumberland, Snyder and 1 more | 42 min |
| Jul 11, 8:43 PM EDT | Severe Thunderstorm Warning | CTP | Columbia, Lycoming, Montour, Northumberland, Sullivan | 62 min |
| Jul 11, 8:44 PM EDT | Severe Thunderstorm Warning | CTP | Cumberland, Dauphin, Lebanon, Perry, Schuylkill | 76 min |
| Jul 11, 8:52 PM EDT | Tornado Warning | CTP | Dauphin | 23 min |
| Jul 11, 9:07 PM EDT | Areal Flood Advisory | CTP | Columbia, Lycoming, Montour, Northumberland, Sullivan, Union | 2 hr |
| Jul 11, 9:08 PM EDT | Special Weather Statement | CTP | Franklin | 37 min |
| Jul 11, 9:32 PM EDT | Special Weather Statement | CTP | Fulton | 28 min |
| Jul 11, 9:32 PM EDT | Severe Thunderstorm Warning | CTP | Cumberland, Dauphin, Lebanon, York | 58 min |
| Jul 11, 9:52 PM EDT | Severe Thunderstorm Warning | CTP | Schuylkill | 53 min |
| Jul 11, 10:06 PM EDT | Flash Flood Warning | CTP | Cumberland, Dauphin, Lebanon, York | 118 min |
| Jul 11, 10:35 PM EDT | Special Weather Statement | CTP | Lebanon, York | 70 min |
| Jul 12, 12:04 AM EDT | Areal Flood Advisory | CTP | Cumberland, Dauphin, Lebanon, York | 116 min |
| Jul 12, 2:15 PM EDT | Special Weather Statement | CTP | Lancaster | 60 min |
| Jul 12, 2:34 PM EDT | Special Weather Statement | CTP | Mifflin | 26 min |
| Jul 12, 2:36 PM EDT | Special Weather Statement | CTP | Perry | 24 min |
| Jul 12, 2:45 PM EDT | Special Weather Statement | CTP | Adams, Franklin | 60 min |
| Jul 12, 2:49 PM EDT | Severe Thunderstorm Warning | CTP | Cumberland, Perry | 41 min |
| Jul 12, 2:59 PM EDT | Special Weather Statement | CTP | Mifflin | 31 min |
| Jul 12, 3:17 PM EDT | Special Weather Statement | CTP | Lebanon | 43 min |
| Jul 12, 3:30 PM EDT | Special Weather Statement | CTP | Juniata | 45 min |
| Jul 12, 3:31 PM EDT | Areal Flood Advisory | CTP | Lancaster | 119 min |
| Jul 12, 3:55 PM EDT | Severe Thunderstorm Warning | CTP | Dauphin, Perry | 35 min |
| Jul 12, 3:56 PM EDT | Flash Flood Warning | CTP | Lancaster | 2 hr |
| Jul 12, 3:57 PM EDT | Severe Thunderstorm Warning | CTP | Lancaster | 63 min |
| Jul 12, 3:59 PM EDT | Severe Thunderstorm Warning | CTP | Cumberland, York | 46 min |
| Jul 12, 4:11 PM EDT | Severe Thunderstorm Warning | CTP | Cumberland, Dauphin, Lancaster, Lebanon, York | 34 min |
| Jul 12, 4:42 PM EDT | Severe Thunderstorm Warning | CTP | Dauphin, Lancaster, Lebanon, York | 63 min |
| Jul 12, 4:57 PM EDT | Areal Flood Advisory | CTP | Lancaster | 2 hr |
| Jul 12, 5:29 PM EDT | Severe Thunderstorm Warning | CTP | Lancaster | 61 min |
| Jul 12, 5:42 PM EDT | Areal Flood Advisory | CTP | Lancaster | 93 min |
| Jul 12, 6:31 PM EDT | Areal Flood Advisory | CTP | Lancaster | 119 min |
| Jul 12, 6:43 PM EDT | Areal Flood Advisory | CTP | Tioga | 92 min |
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.