Alert archive / Pennsylvania / River Flood Warnings in 2021

River Flood Warning 50, NWS Philadelphia/Mount Holly

September 1, 2021Chester County, Pennsylvania

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.

actionminormoderatemajor510152009/0109/0209/03
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.

IssuedProductOfficeCountiesLasted
Sep 1, 6:19 AM EDTAreal Flood AdvisoryPHIChester, Delaware116 min
Sep 1, 6:49 AM EDTFlash Flood WarningPHIChester, Delaware, Philadelphia86 min
Sep 1, 11:24 AM EDTAreal Flood AdvisoryPHIBerks, Carbon, Lehigh, Monroe, Northampton3 hr
Sep 1, 12:07 PM EDTFlash Flood WarningPHICarbon, Monroe4 hr
Sep 1, 1:29 PM EDTFlash Flood WarningPHIBerks, Lehigh6 hr
Sep 1, 2:53 PM EDTFlash Flood WarningPHIBerks, Chester, Delaware, Montgomery9 hr
Sep 1, 3:55 PM EDTRiver Flood WarningPHIMontgomery36 hr
Sep 1, 3:55 PM EDTRiver Flood WarningPHIChester, Montgomery, Philadelphia43 hr
Sep 1, 3:55 PM EDTRiver Flood WarningPHIMontgomery, Philadelphia41 hr
Sep 1, 3:55 PM EDTRiver Flood WarningPHIPhiladelphia39 hr
Sep 1, 3:55 PM EDTRiver Flood WarningPHIBerks24 hr
Sep 1, 4:02 PM EDTRiver Flood WarningPHIMonroe24 hr
Sep 1, 4:04 PM EDTAreal Flood WarningPHICarbon, Monroe, Northampton24 hr
Sep 1, 4:10 PM EDTRiver Flood WarningPHIMonroe19 hr
Sep 1, 4:12 PM EDTFlash Flood WarningPHIBerks, Bucks, Lehigh, Montgomery, Northampton7 hr
Sep 1, 4:12 PM EDTRiver Flood WarningPHILehigh, Northampton25 hr
Sep 1, 4:12 PM EDTRiver Flood WarningPHILehigh, Northampton24 hr
Sep 1, 4:12 PM EDTRiver Flood WarningPHICarbon15 hr
Sep 1, 4:13 PM EDTTornado WarningPHIChester32 min
Sep 1, 4:20 PM EDTRiver Flood WarningPHIMontgomery22 hr
Sep 1, 4:21 PM EDTRiver Flood WarningPHIBucks29 hr
Sep 1, 4:42 PM EDTFlash Flood Warning EmergencyConsiderable damage threatPHIChester, Delaware, Montgomery6 hr
Sep 1, 5:13 PM EDTSevere Thunderstorm WarningPHIBucks, Chester, Delaware, Montgomery, Philadelphia47 min
Sep 1, 5:15 PM EDTTornado WarningPHIDelaware, Montgomery, Philadelphia30 min
Sep 1, 5:26 PM EDTFlash Flood WarningPHIBucks, Delaware, Montgomery, Philadelphia9 hr
Sep 1, 5:34 PM EDTTornado WarningPHIBucks, Montgomery, Philadelphia26 min
Sep 1, 5:42 PM EDTFlash Flood WarningPHIBucks10 hr
Sep 1, 5:57 PM EDTTornado WarningPHIBucks33 min
Sep 1, 6:08 PM EDTFlash Flood WarningPHIMonroe, Northampton6 hr
Sep 1, 6:20 PM EDTTornado WarningPHIBucks40 min
Sep 1, 6:22 PM EDTTornado Warning Tornado observedPHIPhiladelphia23 min
Sep 1, 6:38 PM EDTRiver Flood WarningPHIChester, Delaware26 hr
Sep 1, 6:42 PM EDTTornado WarningPHIBucks, Philadelphia33 min
Sep 1, 6:59 PM EDTSevere Thunderstorm WarningPHIBucks61 min
Sep 1, 7:04 PM EDTTornado Warning EmergencyTornado observedCatastrophic damage threatPHIBucks26 min
Sep 1, 7:05 PM EDTFlash Flood Warning EmergencyCatastrophic damage threatPHIBucks8 hr
Sep 1, 7:22 PM EDTTornado WarningPHIBucks11 min
Sep 1, 7:23 PM EDTAreal Flood WarningPHIBerks, Lehigh14 hr
Sep 1, 7:31 PM EDTFlash Flood Warning EmergencyCatastrophic damage threatPHIBucks4 hr
Sep 1, 7:53 PM EDTRiver Flood WarningPHIDelaware13 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.