Alert archive / Pennsylvania / Flash Flood Watches in 2021
Flash Flood Watch 7, NWS State College, PA
NWS State College, PA issued this flash flood watch at Aug 27, 2021, 4:40 AM EDT for 4 counties in Pennsylvania. It took effect at Aug 27, 2021, 1:00 PM EDT. It was in force for 8 hr.
The area
The counties it named.
The facts
- Issued
- Aug 27, 2021, 4:40 AM EDT (08:40 UTC)
- In effect from
- Aug 27, 2021, 1:00 PM EDT
- Expired
- Aug 27, 2021, 9:28 PM EDT
- In force
- 8 hr
- Issued by
- NWS State College, PA
- Flood severity
- None
Counties Dauphin County, PA, Lancaster County, PA, Lebanon County, PA, York County, PA
The radar
The State College radar (KCCX), 147 km from the middle of the area, began a volume at 08:41 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 00:00Z, 8.7 hours before the alert went out and 155 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
- 1253 J/kg
- Mixed-layer CIN
- -53 J/kg
- Mixed-layer LCL
- 1438 m above ground
- 0-6 km bulk shear
- 8 kt
- 0-1 km storm-relative helicity
- 13 m²/s²
- 0-3 km storm-relative helicity
- 37 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
076 WGUS61 KCTP 270840 FFACTP URGENT - IMMEDIATE BROADCAST REQUESTED Flood Watch National Weather Service State College PA 440 AM EDT Fri Aug 27 2021 PAZ057-059-065-066-272345- /O.NEW.KCTP.FF.A.0007.210827T1700Z-210828T0500Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Dauphin-Lebanon-York-Lancaster- Including the cities of Lancaster, Harrisburg, Lebanon, Hershey, and York 440 AM EDT Fri Aug 27 2021 ...FLASH FLOOD WATCH IN EFFECT FROM 1 PM EDT THIS AFTERNOON 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, Dauphin, Lancaster, Lebanon and York. * From 1 PM EDT this afternoon through late tonight. * The potential for localized, heavy downpours over a short duration along with elevated streamflows, above normal soil moisture, and above average rainfall in the past week will result in an increased risk of isolated to scattered rapid-onset flooding. * Urban areas are the most vulnerable with street flooding and road closures possible. Rapid rises on streams and creeks may occur and could lead to adjacent inundation flooding. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$ Steinbugl/Martin
3 follow-up statements
494 WGUS61 KCTP 271828 FFACTP Flood Watch National Weather Service State College PA 228 PM EDT Fri Aug 27 2021 PAZ057-059-065-066-280500- /O.CON.KCTP.FF.A.0007.000000T0000Z-210828T0500Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Dauphin-Lebanon-York-Lancaster- Including the cities of Harrisburg, Hershey, Lebanon, York, and Lancaster 228 PM EDT Fri Aug 27 2021 ...FLASH FLOOD WATCH REMAINS IN EFFECT UNTIL 1 AM EDT SATURDAY... The Flash Flood Watch continues for * A portion of central Pennsylvania, including the following areas, Dauphin, Lancaster, Lebanon, and York. * Until 1 AM EDT Saturday * The potential for localized, heavy downpours over a short duration along with elevated streamflows, above normal soil moisture, and above average rainfall in the past week will result in an increased risk of isolated to scattered rapid- onset flooding. * Urban areas are the most vulnerable with street flooding and road closures possible. Rapid rises on streams and creeks may occur and could lead to adjacent inundation flooding. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$
476 WGUS61 KCTP 280013 FFACTP Flood Watch National Weather Service State College PA 813 PM EDT Fri Aug 27 2021 PAZ057-065-280115- /O.CAN.KCTP.FF.A.0007.000000T0000Z-210828T0500Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Dauphin-York- Including the cities of Harrisburg, Hershey, and York 813 PM EDT Fri Aug 27 2021 ...FLASH FLOOD WATCH IS CANCELLED... The Flash Flood Watch for a portion of central Pennsylvania, including Dauphin and York counties, has been cancelled. The Flood Watch is cancelled. $$ PAZ059-066-280500- /O.CON.KCTP.FF.A.0007.000000T0000Z-210828T0500Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Lebanon-Lancaster- Including the cities of Lancaster and Lebanon 813 PM EDT Fri Aug 27 2021 ...FLASH FLOOD WATCH REMAINS IN EFFECT UNTIL 1 AM EDT SATURDAY... The Flash Flood Watch continues for * A portion of central Pennsylvania, including the following areas, Lancaster and Lebanon. * Until 1 AM EDT Saturday. * Heavy showers and thunderstorm have diminished in intensity this evening. However, isolated flooding still can't be rule out through late evening. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$ KF
067 WGUS61 KCTP 280128 FFACTP Flood Watch National Weather Service State College PA 928 PM EDT Fri Aug 27 2021 PAZ059-066-280230- /O.CAN.KCTP.FF.A.0007.000000T0000Z-210828T0500Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Lebanon-Lancaster- Including the cities of Lancaster and Lebanon 928 PM EDT Fri Aug 27 2021 ...FLASH FLOOD WATCH IS CANCELLED... The Flash Flood Watch for a portion of central Pennsylvania, including Lancaster and Lebanon counties, has been cancelled. The Flood Watch is cancelled. Flooding is no longer expected to pose a threat. Please continue to heed remaining road closures. $$ KF
The office that day
Everything else NWS State College, PA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 27, 2:13 PM EDT | Areal Flood Advisory | CTP | Potter | 2 hr |
| Aug 27, 3:10 PM EDT | Special Weather Statement | CTP | York | 35 min |
| Aug 27, 3:37 PM EDT | Special Weather Statement | CTP | Juniata | 38 min |
| Aug 27, 4:13 PM EDT | Special Weather Statement | CTP | Tioga | 32 min |
| Aug 27, 4:29 PM EDT | Areal Flood Advisory | CTP | Tioga | 2 hr |
| Aug 27, 4:34 PM EDT | Areal Flood Advisory | CTP | Columbia, Northumberland, Schuylkill | 2 hr |
| Aug 27, 4:50 PM EDT | Areal Flood Advisory | CTP | Lancaster, York | 115 min |
| Aug 27, 4:55 PM EDT | Flash Flood Warning | CTP | Tioga | 99 min |
| Aug 27, 5:02 PM EDT | Special Weather Statement | CTP | York | 28 min |
| Aug 27, 5:11 PM EDT | Special Weather Statement | CTP | Lancaster | 49 min |
| Aug 27, 5:13 PM EDT | Special Weather Statement | CTP | Dauphin | 47 min |
| Aug 27, 5:16 PM EDT | Severe Thunderstorm Warning | CTP | Lancaster | 59 min |
| Aug 27, 5:38 PM EDT | Areal Flood Advisory | CTP | Dauphin, Lebanon | 2 hr |
| Aug 27, 5:46 PM EDT | Areal Flood Advisory | CTP | Lancaster, Lebanon | 80 min |
| Aug 27, 5:57 PM EDT | Flash Flood Warning | CTP | Dauphin | 70 min |
| Aug 27, 6:05 PM EDT | Special Weather Statement | CTP | Lebanon | 25 min |
| Aug 27, 6:07 PM EDT | Flash Flood Warning | CTP | Lancaster | 60 min |
| Aug 27, 6:18 PM EDT | Areal Flood Advisory | CTP | Dauphin, Lebanon, Schuylkill | 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.