Alert archive / Pennsylvania / River Flood Warnings in 2021
River Flood Warning 50, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this river flood warning at Sep 1, 2021, 5:07 PM EDT for Chester County, Pennsylvania. It took effect at Sep 1, 2021, 5:55 PM EDT. It was in force for 16 hr.
The area
The outline as issued.
The facts
- Issued
- Sep 1, 2021, 5:07 PM EDT (21:07 UTC)
- In effect from
- Sep 1, 2021, 5:55 PM EDT
- Expired
- Sep 2, 2021, 10:19 AM EDT
- In force
- 16 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 21:06 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 19.24 ft at Sep 2, 2021, 12:00 AM 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.
516 WGUS41 KPHI 012107 FLWPHI BULLETIN - IMMEDIATE BROADCAST REQUESTED Flood Warning National Weather Service Mount Holly NJ 507 PM EDT Wed Sep 1 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... Motorists should not attempt to drive around barricades or drive cars through flooded areas. Turn around...don't drown when encountering flooded roads. Most flood deaths occur in vehicles. Additional information is available at www.weather.gov/phi. PAC029-020245- /O.NEW.KPHI.FL.W.0050.210901T2200Z-210902T0234Z/ /DWNP1.1.ER.210901T2200Z.210901T2300Z.210902T0033Z.NO/ 507 PM EDT Wed Sep 1 2021 The National Weather Service in Mount Holly has issued a * Flood Warning for the East Branch Brandywine Creek Below Downingtown. * For this evening. * At 4:45 PM EDT Wednesday the stage was 5.2 feet. * Flood stage is 7.0 feet. * Minor flooding is forecast. * Forecast...The river is expected to rise above flood stage this evening to a crest of 8.4 feet this evening. It will then fall below flood stage this evening. * 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 8.3 feet on 06/04/2003. && Fld Observed Forecasts (5 pm EDT) Location Stg Stg Day/Time Thu Fri Sat East Branch Brandywine Creek Downingtown 7.0 5.2 Wed 4 pm EDT 2.6 MSG MSG && LAT...LON 4002 7567 3993 7561 3991 7567 4001 7574 $$ NC
5 follow-up statements
793 WGUS41 KPHI 012155 FLWPHI BULLETIN - IMMEDIATE BROADCAST REQUESTED Flood Warning National Weather Service Mount Holly NJ 555 PM EDT Wed Sep 1 2021 ...Forecast flooding changed from Minor to Moderate severity and increased in duration for the following rivers in Pennsylvania... East Branch Brandywine Creek Below Downingtown affecting Chester County. For the Brandywine Creek...including Downingtown...Moderate flooding is forecast. PRECAUTIONARY/PREPAREDNESS ACTIONS... Motorists should not attempt to drive around barricades or drive cars through flooded areas. Turn around...don't drown when encountering flooded roads. Most flood deaths occur in vehicles. Additional information is available at www.weather.gov/phi. PAC029-020245- /O.EXT.KPHI.FL.W.0050.210901T2155Z-210902T0244Z/ /DWNP1.2.ER.210901T2111Z.210901T2300Z.210902T0044Z.NO/ 555 PM EDT Wed Sep 1 2021 ...Forecast flooding increased from Minor to Moderate severity and increased in duration until late this evening... The Flood Warning continues for the East Branch Brandywine Creek Below Downingtown. * From this afternoon to this evening. * At 5:45 PM EDT Wednesday the stage was 8.9 feet. * Flood stage is 7.0 feet. * Minor flooding is occurring and moderate flooding is forecast. * Recent Activity...The maximum river stage in the 24 hours ending at 5:45 PM EDT Wednesday was 8.9 feet. * Forecast...The river is expected to rise to a crest of 10.3 feet this evening. It will then fall below flood stage this evening. * 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. * Impact...At 11.0 feet, Jefferson Avenue in Downingtown floods. Business Route 30 and Pennsylvania Avenue also flood. * Flood History...This crest compares to a previous crest of 10.4 feet on 12/05/1993. && Fld Observed Forecasts (6 pm EDT) Location Stg Stg Day/Time Thu Fri Sat East Branch Brandywine Creek Downingtown 7.0 8.9 Wed 5 pm EDT 2.6 MSG MSG && LAT...LON 4002 7567 3993 7561 3991 7567 4001 7574 $$ NC
506 WGUS41 KPHI 012359 FLWPHI BULLETIN - IMMEDIATE BROADCAST REQUESTED Flood Warning National Weather Service Mount Holly NJ 759 PM EDT Wed Sep 1 2021 ...Forecast flooding changed from Moderate to Major severity and increased in duration for the following rivers in Pennsylvania... East Branch Brandywine Creek Below Downingtown affecting Chester County. For the Brandywine Creek...including Downingtown...Major flooding is forecast. PRECAUTIONARY/PREPAREDNESS ACTIONS... Motorists should not attempt to drive around barricades or drive cars through flooded areas. Turn around...don't drown when encountering flooded roads. Most flood deaths occur in vehicles. Be especially cautious at night when it is harder to recognize the dangers of flooding. Additional information is available at www.weather.gov/phi. PAC029-020900- /O.EXT.KPHI.FL.W.0050.000000T0000Z-210902T0848Z/ /DWNP1.3.ER.210901T2111Z.210901T2345Z.210902T0248Z.NO/ 759 PM EDT Wed Sep 1 2021 ...Forecast flooding increased from Moderate to Major severity and increased in duration until late tonight... The Flood Warning continues for the East Branch Brandywine Creek Below Downingtown. * Until late tonight. * At 7:45 PM EDT Wednesday the stage was 12.6 feet. * Flood stage is 7.0 feet. * Major flooding is occurring and major flooding is forecast. * Recent Activity...The maximum river stage in the 24 hours ending at 7:45 PM EDT Wednesday was 12.6 feet. * Forecast...The river is expected to fall below flood stage late this evening and continue falling to 2.6 feet early Friday morning. * 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. * Impact...At 11.0 feet, Jefferson Avenue in Downingtown floods. Business Route 30 and Pennsylvania Avenue also flood. * Impact...At 12.0 feet, Residential basements flood along Jefferson Avenue. * Impact...At 13.0 feet, Route 30 in Downingtown is closed due to flooding. Route 322 (Brandywine Avenue) is closed between Business 30 and Boot Road due to flooding. Businesses along business Route 30, between the creek and Downing Avenue, take on water. * Flood History...This crest compares to a previous crest of 12.6 feet on 10/19/1996. && Fld Observed Forecasts (8 pm EDT) Location Stg Stg Day/Time Thu Fri Sat East Branch Brandywine Creek Downingtown 7.0 12.6 Wed 7 pm EDT 2.6 MSG MSG && LAT...LON 4002 7567 3993 7561 3991 7567 4001 7574 $$ NC
166 WGUS81 KPHI 020058 FLSPHI Flood Statement National Weather Service Mount Holly NJ 858 PM EDT Wed Sep 1 2021 ...The Flood Warning continues for the following rivers in Pennsylvania... East Branch Brandywine Creek Below Downingtown affecting Chester County. For the Brandywine Creek...including Downingtown...Major flooding is forecast. PRECAUTIONARY/PREPAREDNESS ACTIONS... Motorists should not attempt to drive around barricades or drive cars through flooded areas. Be especially cautious at night when it is harder to recognize the dangers of flooding. Turn around...don't drown when encountering flooded roads. Most flood deaths occur in vehicles. Additional information is available at www.weather.gov/phi. PAC029-020700- /O.EXT.KPHI.FL.W.0050.000000T0000Z-210902T0700Z/ /DWNP1.3.ER.210901T2111Z.210902T0045Z.210902T0500Z.NR/ 858 PM EDT Wed Sep 1 2021 ...The Flood Warning is now in effect until late tonight... The Flood Warning continues for the East Branch Brandywine Creek Below Downingtown. * Until late tonight. * At 8:45 PM EDT Wednesday the stage was 15.5 feet. * Flood stage is 7.0 feet. * Major flooding is occurring and major flooding is forecast. This approaches the flood of record. * Recent Activity...The maximum river stage in the 24 hours ending at 8:45 PM EDT Wednesday was 15.5 feet. * Forecast...The river is expected to fall below flood stage just after midnight tonight and continue falling to 2.6 feet early Friday morning. * 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. * Impact...At 11.0 feet, Jefferson Avenue in Downingtown floods. Business Route 30 and Pennsylvania Avenue also flood. * Impact...At 12.0 feet, Residential basements flood along Jefferson Avenue. * Impact...At 13.0 feet, Route 30 in Downingtown is closed due to flooding. Route 322 (Brandywine Avenue) is closed between Business 30 and Boot Road due to flooding. Businesses along business Route 30, between the creek and Downing Avenue, take on water. * Flood History...This crest compares to a previous crest of 14.8 feet on 09/16/1999. && Fld Observed Forecasts (9 pm EDT) Location Stg Stg Day/Time Thu Fri Sat East Branch Brandywine Creek Downingtown 7.0 15.5 Wed 8 pm EDT 2.6 MSG MSG && LAT...LON 4002 7567 3993 7561 3991 7567 4001 7574 $$ NC
397 WGUS81 KPHI 020315 FLSPHI Flood Statement National Weather Service Mount Holly NJ 1115 PM EDT Wed Sep 1 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...Major flooding is forecast. PRECAUTIONARY/PREPAREDNESS ACTIONS... Motorists should not attempt to drive around barricades or drive cars through flooded areas. Be especially cautious at night when it is harder to recognize the dangers of flooding. Turn around...don't drown when encountering flooded roads. Most flood deaths occur in vehicles. Additional information is available at www.weather.gov/phi. PAC029-021430- /O.EXT.KPHI.FL.W.0050.000000T0000Z-210902T1419Z/ /DWNP1.3.ER.210901T2111Z.210902T0245Z.210902T0819Z.NR/ 1115 PM EDT Wed Sep 1 2021 ...The Flood Warning is now in effect until late tomorrow morning... The Flood Warning continues for the East Branch Brandywine Creek Below Downingtown. * Until Thursday morning. * At 10:45 PM EDT Wednesday the stage was 19.0 feet. * Flood stage is 7.0 feet. * Major flooding is occurring and major flooding is forecast. This exceeds the flood of record. * Recent Activity...The maximum river stage in the 24 hours ending at 10:45 PM EDT Wednesday was 19.0 feet. * Forecast...The river will fall below flood stage late tonight to 2.5 feet and then begin rising late tomorrow morning. It will then rise again to 2.7 feet early tomorrow afternoon. It will fall to 2.5 feet and then begin rising tomorrow afternoon then rise again. * 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. * Impact...At 11.0 feet, Jefferson Avenue in Downingtown floods. Business Route 30 and Pennsylvania Avenue also flood. * Impact...At 12.0 feet, Residential basements flood along Jefferson Avenue. * Impact...At 13.0 feet, Route 30 in Downingtown is closed due to flooding. Route 322 (Brandywine Avenue) is closed between Business 30 and Boot Road due to flooding. Businesses along business Route 30, between the creek and Downing Avenue, take on water. * Flood History...No available flood history. && Fld Observed Forecasts (11 pm EDT) Location Stg Stg Day/Time Thu Fri Sat East Branch Brandywine Creek Downingtown 7.0 19.0 Wed 10 pm ED 2.6 MSG MSG && LAT...LON 4002 7567 3993 7561 3991 7567 4001 7574 $$ Meola
249 WGUS81 KPHI 021432 FLSPHI Flood Statement National Weather Service Mount Holly NJ 1032 AM EDT Thu Sep 2 2021 ...The Flood Warning will be expiring this morning for the following rivers in Pennsylvania... East Branch Brandywine Creek Below Downingtown affecting Chester County. PAC029-021545- /O.EXP.KPHI.FL.W.0050.000000T0000Z-210902T1419Z/ /DWNP1.3.ER.210901T2111Z.210902T0245Z.210902T0819Z.NR/ 1032 AM EDT Thu Sep 2 2021 ...The Flood Warning for the East Branch Brandywine Creek Below Downingtown has expired... The Flood Warning has expired for the East Branch Brandywine Creek Below Downingtown. * At 10:45 PM EDT Wednesday the stage was 7.45 feet. * Flood stage is 7.0 feet. * Recent Activity...The maximum river stage in the 24 hours ending at 10:45 PM EDT Wednesday was 19.0 feet. * Forecast...The river will continue to fall this morning. && Fld Observed Forecasts (10 am EDT) Location Stg Stg Day/Time Fri Sat Sun East Branch Brandywine Creek Downingtown 7.0 7.45 Wed 10 pm ED 2.4 MSG MSG && LAT...LON 4002 7567 3993 7561 3991 7567 4001 7574 $$ Kruzdlo
The office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 1, 6:19 AM EDT | Areal Flood Advisory | PHI | Chester, Delaware | 116 min |
| Sep 1, 6:49 AM EDT | Flash Flood Warning | PHI | Chester, Delaware, Philadelphia | 86 min |
| Sep 1, 11:24 AM EDT | Areal Flood Advisory | PHI | Berks, Carbon, Lehigh, Monroe, Northampton | 3 hr |
| Sep 1, 12:07 PM EDT | Flash Flood Warning | PHI | Carbon, Monroe | 4 hr |
| Sep 1, 1:29 PM EDT | Flash Flood Warning | PHI | Berks, Lehigh | 6 hr |
| Sep 1, 2:53 PM EDT | Flash Flood Warning | PHI | Berks, Chester, Delaware, Montgomery | 9 hr |
| Sep 1, 3:55 PM EDT | River Flood Warning | PHI | Montgomery | 36 hr |
| Sep 1, 3:55 PM EDT | River Flood Warning | PHI | Chester, Montgomery, Philadelphia | 43 hr |
| Sep 1, 3:55 PM EDT | River Flood Warning | PHI | Montgomery, Philadelphia | 41 hr |
| Sep 1, 3:55 PM EDT | River Flood Warning | PHI | Philadelphia | 39 hr |
| Sep 1, 3:55 PM EDT | River Flood Warning | PHI | Berks | 24 hr |
| Sep 1, 4:02 PM EDT | River Flood Warning | PHI | Monroe | 24 hr |
| Sep 1, 4:04 PM EDT | Areal Flood Warning | PHI | Carbon, Monroe, Northampton | 24 hr |
| Sep 1, 4:10 PM EDT | River Flood Warning | PHI | Monroe | 19 hr |
| Sep 1, 4:12 PM EDT | Flash Flood Warning | PHI | Berks, Bucks, Lehigh, Montgomery, Northampton | 7 hr |
| Sep 1, 4:12 PM EDT | River Flood Warning | PHI | Lehigh, Northampton | 25 hr |
| Sep 1, 4:12 PM EDT | River Flood Warning | PHI | Lehigh, Northampton | 24 hr |
| Sep 1, 4:12 PM EDT | River Flood Warning | PHI | Carbon | 15 hr |
| Sep 1, 4:13 PM EDT | Tornado Warning | PHI | Chester | 32 min |
| Sep 1, 4:20 PM EDT | River Flood Warning | PHI | Montgomery | 22 hr |
| Sep 1, 4:21 PM EDT | River Flood Warning | PHI | Bucks | 29 hr |
| Sep 1, 4:42 PM EDT | Flash Flood Warning | PHI | Chester, Delaware, Montgomery | 6 hr |
| Sep 1, 5:13 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Chester, Delaware, Montgomery, Philadelphia | 47 min |
| Sep 1, 5:15 PM EDT | Tornado Warning | PHI | Delaware, Montgomery, Philadelphia | 30 min |
| Sep 1, 5:26 PM EDT | Flash Flood Warning | PHI | Bucks, Delaware, Montgomery, Philadelphia | 9 hr |
| Sep 1, 5:34 PM EDT | Tornado Warning | PHI | Bucks, Montgomery, Philadelphia | 26 min |
| Sep 1, 5:42 PM EDT | Flash Flood Warning | PHI | Bucks | 10 hr |
| Sep 1, 5:57 PM EDT | Tornado Warning | PHI | Bucks | 33 min |
| Sep 1, 6:08 PM EDT | Flash Flood Warning | PHI | Monroe, Northampton | 6 hr |
| Sep 1, 6:20 PM EDT | Tornado Warning | PHI | Bucks | 40 min |
| Sep 1, 6:22 PM EDT | Tornado Warning | PHI | Philadelphia | 23 min |
| Sep 1, 6:38 PM EDT | River Flood Warning | PHI | Chester, Delaware | 26 hr |
| Sep 1, 6:42 PM EDT | Tornado Warning | PHI | Bucks, Philadelphia | 33 min |
| Sep 1, 6:59 PM EDT | Severe Thunderstorm Warning | PHI | Bucks | 61 min |
| Sep 1, 7:04 PM EDT | Tornado Warning | PHI | Bucks | 26 min |
| Sep 1, 7:05 PM EDT | Flash Flood Warning | PHI | Bucks | 8 hr |
| Sep 1, 7:22 PM EDT | Tornado Warning | PHI | Bucks | 11 min |
| Sep 1, 7:23 PM EDT | Areal Flood Warning | PHI | Berks, Lehigh | 14 hr |
| Sep 1, 7:31 PM EDT | Flash Flood Warning | PHI | Bucks | 4 hr |
| Sep 1, 7:53 PM EDT | River Flood Warning | PHI | Delaware | 13 hr |
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.