Alert archive / Pennsylvania / River Flood Warnings in 2021
River Flood Warning 73, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this river flood warning at Sep 23, 2021, 1:48 PM EDT for Chester County, Pennsylvania. It took effect at Sep 23, 2021, 2:36 PM EDT. It was in force for 4 hr.
The area
The outline as issued.
The facts
- Issued
- Sep 23, 2021, 1:48 PM EDT (17:48 UTC)
- In effect from
- Sep 23, 2021, 2:36 PM EDT
- Expired
- Sep 23, 2021, 6:55 PM EDT
- In force
- 4 hr
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Flood severity
- Minor
County Chester County, PA
The radar
The Philadelphia radar (KDIX), 108 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 river
Written for the forecast point East Branch Brandywine Creek below Downingtown (DWNP1). The gauge peaked at 8.82 ft at Sep 23, 2021, 4:00 PM EDT.
- Action stage
- 6 ft
- Minor stage
- 7 ft
- Moderate stage
- 9 ft
- Major stage
- 11 ft
This gauge today: stage, forecast and historic crests
Stage from the USGS instantaneous record for site 01480870, one reading an hour, from a day before the product to a day after it ended. Flood stages are today's.
The text
As transmitted.
167 WGUS41 KPHI 231748 FLWPHI BULLETIN - IMMEDIATE BROADCAST REQUESTED Flood Warning National Weather Service Mount Holly NJ 148 PM EDT Thu Sep 23 2021 ...The National Weather Service in Mount Holly NJ has issued a Flood Warning for the following rivers in Pennsylvania... East Branch Brandywine Creek Below Downingtown affecting Chester County. For the Brandywine Creek...including Downingtown...Minor flooding is forecast. PRECAUTIONARY/PREPAREDNESS ACTIONS... Turn around...don't drown when encountering flooded roads. Most flood deaths occur in vehicles. Additional information is available at www.weather.gov/phi. PAC029-240145- /O.NEW.KPHI.FL.W.0073.210923T1836Z-210924T0137Z/ /DWNP1.1.ER.210923T1836Z.210923T1900Z.210923T1936Z.NO/ 148 PM EDT Thu Sep 23 2021 The National Weather Service in Mount Holly has issued a * Flood Warning for the East Branch Brandywine Creek Below Downingtown. * Until this evening. * At 1:31 PM EDT Thursday the stage was 6.0 feet. * Flood stage is 7.0 feet. * Minor flooding is forecast. * Forecast...The river is expected to rise above flood stage this afternoon to a crest of 7.5 feet early this afternoon. It will then fall below flood stage late this afternoon. * Impact...At 6.0 feet, Open adjacent land next to the creek floods. * Impact...At 8.0 feet, Dowlin Forge Road begins to flood. * Flood History...This crest compares to a previous crest of 7.2 feet on 03/01/2021. && Stream Fld Observed Fcsts (unknown Crest Location Stg Stg Day/Time d1 d2 Stg Time Date East Branch Bran Downingtown 7.0 6.0 Thu 1 pm MSG MSG 7.5 3pm 9/23 && LAT...LON 4002 7567 3993 7561 3991 7567 4001 7574 $$ NC
3 follow-up statements
586 WGUS81 KPHI 231859 FLSPHI Flood Statement National Weather Service Mount Holly NJ 259 PM EDT Thu Sep 23 2021 ...The Flood Warning is extended for the following rivers in Pennsylvania... East Branch Brandywine Creek Below Downingtown affecting Chester County. For the Brandywine Creek...including Downingtown...Minor flooding is forecast. PRECAUTIONARY/PREPAREDNESS ACTIONS... Turn around...don't drown when encountering flooded roads. Most flood deaths occur in vehicles. Additional information is available at www.weather.gov/phi. PAC029-240215- /O.EXT.KPHI.FL.W.0073.000000T0000Z-210924T0206Z/ /DWNP1.1.ER.210923T1800Z.210923T1900Z.210923T2006Z.NO/ 259 PM EDT Thu Sep 23 2021 ...The Flood Warning is now in effect until late this evening... The Flood Warning continues for the East Branch Brandywine Creek Below Downingtown. * Until this evening. * At 2:45 PM EDT Thursday the stage was 8.1 feet. * Flood stage is 7.0 feet. * Minor flooding is occurring and minor flooding is forecast. * Recent Activity...The maximum river stage in the 24 hours ending at 2:45 PM EDT Thursday was 8.1 feet. * Forecast...The river is expected to rise to a crest of 8.1 feet shortly. It will then fall below flood stage late this afternoon. * Impact...At 6.0 feet, Open adjacent land next to the creek floods. * Impact...At 8.0 feet, Dowlin Forge Road begins to flood. * Impact...At 9.0 feet, High water on the Brandywine sends backwater up Beaver Creek. Beaver Creek floods inundating parks and the Downingtown Little League fields. * Flood History...This crest compares to a previous crest of 7.9 feet on 08/19/2021. && Stream Fld Observed Fcsts (unknown Crest Location Stg Stg Day/Time d1 d2 Stg Time Date East Branch Bran Downingtown 7.0 8.1 Thu 2 pm MSG MSG 8.1 3pm 9/23 && LAT...LON 4002 7567 3993 7561 3991 7567 4001 7574 $$ NC
931 WGUS81 KPHI 231956 FLSPHI Flood Statement National Weather Service Mount Holly NJ 356 PM EDT Thu Sep 23 2021 ...The Flood Warning is extended for the following rivers in Pennsylvania... East Branch Brandywine Creek Below Downingtown affecting Chester County. For the Brandywine Creek...including Downingtown...Minor flooding is forecast. PRECAUTIONARY/PREPAREDNESS ACTIONS... Turn around...don't drown when encountering flooded roads. Most flood deaths occur in vehicles. Additional information is available at www.weather.gov/phi. PAC029-240315- /O.EXT.KPHI.FL.W.0073.000000T0000Z-210924T0310Z/ /DWNP1.1.ER.210923T1800Z.210923T2000Z.210923T2110Z.NO/ 356 PM EDT Thu Sep 23 2021 ...The Flood Warning is now in effect until late this evening... The Flood Warning continues for the East Branch Brandywine Creek Below Downingtown. * Until this evening. * At 3:45 PM EDT Thursday the stage was 8.7 feet. * Flood stage is 7.0 feet. * Minor flooding is occurring and minor flooding is forecast. * Recent Activity...The maximum river stage in the 24 hours ending at 3:45 PM EDT Thursday was 8.7 feet. * Forecast...The river is expected to rise to a crest of 8.8 feet late this afternoon. It will then fall below flood stage late this afternoon. * Impact...At 6.0 feet, Open adjacent land next to the creek floods. * Impact...At 8.0 feet, Dowlin Forge Road begins to flood. * Impact...At 9.0 feet, High water on the Brandywine sends backwater up Beaver Creek. Beaver Creek floods inundating parks and the Downingtown Little League fields. * Flood History...This crest compares to a previous crest of 9.2 feet on 10/23/2003. && Stream Fld Observed Fcsts (unknown Crest Location Stg Stg Day/Time d1 d2 Stg Time Date East Branch Bran Downingtown 7.0 8.7 Thu 3 pm MSG MSG 8.8 4pm 9/23 && LAT...LON 4002 7567 3993 7561 3991 7567 4001 7574 $$ NC
086 WGUS81 KPHI 232255 FLSPHI Flood Statement National Weather Service Mount Holly NJ 655 PM EDT Thu Sep 23 2021 ...The Flood Warning is cancelled for the following rivers in Pennsylvania... East Branch Brandywine Creek Below Downingtown affecting Chester County. PAC029-240000- /O.CAN.KPHI.FL.W.0073.000000T0000Z-210923T2255Z/ /DWNP1.1.ER.210923T1800Z.210923T2030Z.210923T2300Z.NO/ 655 PM EDT Thu Sep 23 2021 ...The Flood Warning for the East Branch Brandywine Creek Below Downingtown has been cancelled... The Flood Warning is cancelled for the East Branch Brandywine Creek Below Downingtown. * At 6:45 PM EDT Thursday the stage was 7.0 feet. * Flood stage is 7.0 feet. * Forecast...The river has fallen below flood stage and will remain below flood stage. && Stream Fld Observed Fcsts (unknown Crest Location Stg Stg Day/Time d1 d2 Stg Time Date East Branch Bran Downingtown 7.0 7.0 Thu 6 pm MSG MSG 7.0 7pm 9/23 && LAT...LON 4002 7567 3993 7561 3991 7567 4001 7574 $$ NC
The office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 23, 9:12 AM EDT | Coastal Flood Advisory | PHI | Bucks, Delaware, Philadelphia | 10 hr |
| Sep 23, 10:52 AM EDT | Areal Flood Advisory | PHI | Chester | 3 hr |
| Sep 23, 11:33 AM EDT | Areal Flood Advisory | PHI | Berks, Chester, Delaware, Montgomery, Philadelphia | 3 hr |
| Sep 23, 11:40 AM EDT | Areal Flood Advisory | PHI | Berks, Bucks, Carbon, Lehigh, Montgomery, Northampton | 3 hr |
| Sep 23, 11:57 AM EDT | Flash Flood Warning | PHI | Chester, Delaware | 3 hr |
| Sep 23, 12:12 PM EDT | Severe Thunderstorm Warning | PHI | Chester, Delaware, Montgomery, Philadelphia | 48 min |
| Sep 23, 12:28 PM EDT | Flash Flood Warning | PHI | Chester, Delaware, Montgomery, Philadelphia | 4 hr |
| Sep 23, 12:54 PM EDT | Special Weather Statement | PHI | Philadelphia | 51 min |
| Sep 23, 12:56 PM EDT | Areal Flood Advisory | PHI | Bucks, Carbon, Lehigh, Monroe, Montgomery, Northampton and 1 more | 3 hr |
| Sep 23, 12:57 PM EDT | Special Weather Statement | PHI | Bucks | 33 min |
| Sep 23, 1:13 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Delaware, Montgomery, Philadelphia | 47 min |
| Sep 23, 1:42 PM EDT | Flash Flood Warning | PHI | Bucks, Delaware, Montgomery, Philadelphia | 4 hr |
| Sep 23, 1:58 PM EDT | Special Weather Statement | PHI | Bucks | 32 min |
| Sep 23, 2:37 PM EDT | Areal Flood Advisory | PHI | Bucks, Northampton | 3 hr |
| Sep 23, 3:26 PM EDT | Flash Flood Warning | PHI | Bucks | 2 hr |
| Sep 23, 4:26 PM EDT | Areal Flood Warning | PHI | Chester, Delaware, Montgomery, Philadelphia | 80 min |
| Sep 23, 7:18 PM EDT | Areal Flood Warning | PHI | Berks, Montgomery | 36 min |
Nearby
River Flood Warnings in Pennsylvania, 2021Every river 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; radar from the NEXRAD Level II archive; the gauge from the NWS water service and the USGS.