Alert archive / Pennsylvania / Flash Flood Warnings in 2021
Flash Flood Warning 26, NWS State College, PA
NWS State College, PA issued this flash flood warning at Sep 1, 2021, 12:04 PM EDT for 16 counties in Pennsylvania. It was in force for 6 hr. 15 reports came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- Sep 1, 2021, 12:04 PM EDT (16:04 UTC)
- Expired
- Sep 1, 2021, 5:41 PM EDT
- In force
- 6 hr
- Issued by
- NWS State College, PA
- Area
- Storm-based polygon
- Damage threat
- Considerable
- Flood severity
- None
Counties Adams County, PA, Columbia County, PA, Cumberland County, PA, Dauphin County, PA, Franklin County, PA, Juniata County, PA, Lancaster County, PA, Lebanon County, PA, Mifflin County, PA, Montour County, PA, Northumberland County, PA, Perry County, PA, Schuylkill County, PA, Snyder County, PA, Union County, PA, York County, PA
The radar
The State College radar (KCCX), 109 km from the middle of the area, began a volume at 16:04 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Sep 1, 1:42 PM EDT | HEAVY RAIN 2.35 | 1 Nw Stonybrook, PA | |
| Sep 1, 1:55 PM EDT | HEAVY RAIN 3 | Shiremanstown, PA | 3.00 INCHES OF RAIN SINCE 6AM. |
| Sep 1, 2:00 PM EDT | FLASH FLOOD | 1 Sse Harrisburg, PA | WATER RESCUES ONGOING IN HARRISBURG. |
| Sep 1, 2:04 PM EDT | HEAVY RAIN 3.6 | Greencastle, PA | 3.6 INCHES OF RAIN REPORTED IN GREENCASTLE. TRAINED SPOTTER. |
| Sep 1, 2:14 PM EDT | FLASH FLOOD | 1 Wnw Lancaster, PA | WATER RESCUE NEAR F&M COLLEGE. PER LANCASTER CO 911. |
| Sep 1, 3:08 PM EDT | FLASH FLOOD | Linntown, PA | 1 FT OF WATER ACROSS THE ROAD. MULTIPLE OTHER CREEKS NEAR BANK HEIGHT. |
| Sep 1, 3:15 PM EDT | FLASH FLOOD | 2 Sw Lititz, PA | WATER RESCUE. |
| Sep 1, 3:32 PM EDT | HEAVY RAIN 5 | 1 E Herndon, PA | |
| Sep 1, 3:34 PM EDT | FLASH FLOOD | 2 E Williamstown, PA | ROAD CLOSED DUE TO FLOODING. |
| Sep 1, 4:05 PM EDT | HEAVY RAIN 5 | Shiremanstown, PA | 5 INCHES OF RAIN REPORTED IN SHIREMANSTOWN. |
| Sep 1, 4:09 PM EDT | FLASH FLOOD | Shiremanstown, PA | ROAD CLOSED DUE TO FLOODING. |
| Sep 1, 4:14 PM EDT | FLASH FLOOD | Palmyra, PA | WATER RESCUE IN THE 200 BLOCK OF EAST CHERRY STREET. |
| Sep 1, 4:30 PM EDT | FLASH FLOOD | 3 Se Lawn, PA | LITTLE CHIQUIES CREEK SIGNIFICANTLY OVERTOPPED ELIZABETHTOWN ROAD. |
| Sep 1, 5:30 PM EDT | FLASH FLOOD | 1 Sse York, PA | SIGNIFICANT FLOODING ALONG TYLER RUN CREEK IN THE VICINITY OF YORK COLLEGE. |
| Sep 1, 5:46 PM EDT | FLASH FLOOD | 1 Se Newmanstown, PA | VEHICLE IN FLOOD WATERS WITH POSSIBLE RESCUE AT SOUTH ZELLERS ROAD AND SOUTH SHERIDAN ROAD IN MILLCREEK TOWNSHIP. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Washington/Dulle, VA (KIAD), launched 12:00Z, 4.1 hours before the alert went out and 186 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
- 558 J/kg
- Mixed-layer CIN
- -21 J/kg
- Mixed-layer LCL
- 575 m above ground
- 0-6 km bulk shear
- 48 kt
- 0-1 km storm-relative helicity
- 122 m²/s²
- 0-3 km storm-relative helicity
- 223 m²/s²
- Significant tornado parameter
- 0.4
- Supercell composite
- 2.6
The text
As transmitted.
715
WGUS51 KCTP 011604
FFWCTP
PAC001-037-041-043-055-067-071-075-087-093-097-099-107-109-119-133-
012200-
/O.NEW.KCTP.FF.W.0026.210901T1604Z-210901T2200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service State College PA
1204 PM EDT Wed Sep 1 2021
The National Weather Service in State College has issued a
* Flash Flood Warning for...
Columbia County in central Pennsylvania...
Juniata County in central Pennsylvania...
Mifflin County in central Pennsylvania...
Montour County in central Pennsylvania...
Northumberland County in central Pennsylvania...
Schuylkill County in central Pennsylvania...
Snyder County in central Pennsylvania...
Union County in central Pennsylvania...
Adams County in south central Pennsylvania...
Cumberland County in south central Pennsylvania...
Dauphin County in south central Pennsylvania...
Franklin County in south central Pennsylvania...
Lancaster County in south central Pennsylvania...
Lebanon County in south central Pennsylvania...
Perry County in south central Pennsylvania...
York County in south central Pennsylvania...
* Until 600 PM EDT.
* At 1204 PM EDT, Doppler radar and automated rain gauges indicated
heavy rain falling across the warned area. Between 1 and 3 inches
of rain have fallen. The expected rainfall rate is 0.75 to 1.25
inches in 1 hour. Additional rainfall amounts of 1 to 3 inches are
possible in the warned area. Flash flooding is ongoing or expected
to begin shortly.
HAZARD...Life threatening flash flooding. Heavy rain producing
flash flooding.
SOURCE...Radar and automated gauges.
IMPACT...Life threatening flash flooding of creeks and streams,
urban areas, highways, streets and underpasses.
* Some locations that will experience flash flooding include...
Lancaster, Harrisburg, York, Lebanon, Chambersburg, Carlisle,
Lower Allen, Hanover, Bloomsburg, Pottsville, Hershey, Ephrata,
Colonial Park, Weigelstown, Elizabethtown, Waynesboro, Berwick,
Columbia, Sunbury and Progress.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Be aware of your surroundings and do not drive on flooded roads.
&&
LAT...LON 4040 7791 4058 7782 4073 7768 4085 7737
4115 7696 4116 7659 4131 7641 4131 7631
4095 7621 4091 7600 4074 7576 4057 7602
4050 7644 4014 7588 4011 7594 3987 7599
3972 7610 3972 7810 4026 7770 4038 7775
FLASH FLOOD...RADAR AND GAUGE INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
EXPECTED RAINFALL...0.75-1.25 INCHES IN 1 HOUR
$$
Lambert/Ross1 follow-up statement
454
WGUS71 KCTP 012141
FFSCTP
Flash Flood Statement
National Weather Service State College PA
541 PM EDT Wed Sep 1 2021
PAC001-037-041-043-055-067-071-075-087-093-097-099-107-109-119-133-
012151-
/O.CAN.KCTP.FF.W.0026.000000T0000Z-210901T2200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Adams PA-Columbia PA-Cumberland PA-Dauphin PA-Franklin PA-Juniata PA-
Lancaster PA-Lebanon PA-Mifflin PA-Montour PA-Northumberland PA-
Perry PA-Schuylkill PA-Snyder PA-Union PA-York PA-
541 PM EDT Wed Sep 1 2021
...FLASH FLOOD WARNING FOR COLUMBIA, JUNIATA, MIFFLIN, MONTOUR,
NORTHUMBERLAND, SCHUYLKILL, SNYDER, UNION, ADAMS, CUMBERLAND,
DAUPHIN, FRANKLIN, LANCASTER, LEBANON, PERRY AND YORK COUNTIES HAS
BEEN REPLACED WITH A FLOOD WARNING...
LAT...LON 4040 7791 4058 7782 4073 7768 4085 7737
4115 7696 4116 7659 4131 7641 4131 7631
4095 7621 4091 7600 4074 7576 4057 7602
4050 7644 4014 7588 4011 7594 3987 7599
3972 7610 3972 7810 4026 7770 4038 7775
$$
CRThe office that day
Everything else NWS State College, PA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 1, 8:54 AM EDT | Flash Flood Warning | CTP | Bedford, Blair, Cambria, Centre, Clearfield, Fulton and 3 more | 8 hr |
| Sep 1, 9:37 AM EDT | Flash Flood Warning | CTP | Cambria, Clearfield, Somerset | 6 hr |
| Sep 1, 9:45 AM EDT | Areal Flood Advisory | CTP | Adams, Columbia, Cumberland, Dauphin, Franklin, Juniata and 10 more | 2 hr |
| Sep 1, 11:04 AM EDT | River Flood Warning | CTP | Snyder, Union | 17 hr |
| Sep 1, 11:04 AM EDT | River Flood Warning | CTP | Cambria | 17 hr |
| Sep 1, 11:04 AM EDT | River Flood Warning | CTP | Huntingdon | 23 hr |
| Sep 1, 11:04 AM EDT | River Flood Warning | CTP | Juniata, Mifflin | 20 hr |
| Sep 1, 11:04 AM EDT | River Flood Warning | CTP | Bedford, Huntingdon | 30 hr |
| Sep 1, 11:04 AM EDT | River Flood Warning | CTP | Dauphin | 55 hr |
| Sep 1, 1:09 PM EDT | Flash Flood Warning | CTP | Cambria | 5 hr |
| Sep 1, 2:07 PM EDT | Severe Thunderstorm Warning | CTP | Adams | 53 min |
| Sep 1, 2:28 PM EDT | Severe Thunderstorm Warning | CTP | York | 77 min |
| Sep 1, 3:05 PM EDT | Tornado Warning | CTP | York | 23 min |
| Sep 1, 3:25 PM EDT | Severe Thunderstorm Warning | CTP | Lancaster, York | 35 min |
| Sep 1, 3:34 PM EDT | Areal Flood Warning | CTP | Cambria, Clearfield, Somerset | 6 hr |
| Sep 1, 4:21 PM EDT | Severe Thunderstorm Warning | CTP | Lancaster | 39 min |
| Sep 1, 4:24 PM EDT | Flash Flood Warning | CTP | Adams, York | 4 hr |
| Sep 1, 4:40 PM EDT | Areal Flood Warning | CTP | Bedford, Blair, Cambria, Centre, Clearfield, Franklin and 4 more | 6 hr |
| Sep 1, 5:41 PM EDT | Areal Flood Warning | CTP | Adams, Centre, Columbia, Cumberland, Dauphin, Franklin and 15 more | 14 hr |
Nearby
Flash Flood Warnings in Pennsylvania, 2021Every flash flood warning 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.