Alert archive / Pennsylvania / River Flood Warnings in 2020

River Flood Warning 38, NWS Philadelphia/Mount Holly

November 30, 2020Chester County, Pennsylvania

NWS Philadelphia/Mount Holly issued this river flood warning at Nov 30, 2020, 3:51 PM EST for Chester County, Pennsylvania. It was in force for 14 hr.

The area

The outline as issued.

The facts

Issued
Nov 30, 2020, 3:51 PM EST (20:51 UTC)
Expired
Dec 1, 2020, 6:02 AM EST
In force
14 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 20:50 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 8.96 ft at Nov 30, 2020, 8:00 PM EST.

actionminormoderate51011/3012/0112/02
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.

174 
WGUS41 KPHI 302051
FLWPHI

BULLETIN - EAS ACTIVATION REQUESTED
Flood Warning
National Weather Service Mount Holly NJ
351 PM EST Mon Nov 30 2020

...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, Chadds Ford, 
Wilmington...Minor flooding is forecast.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Flood Warning means that flooding is imminent or occurring. All 
interested parties should take necessary precautions immediately.

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.


PAC029-010345-
/O.NEW.KPHI.FL.W.0038.201130T2051Z-201201T0331Z/
/DWNP1.1.ER.201130T2021Z.201201T0200Z.201201T1030Z.NO/
351 PM EST Mon Nov 30 2020

The National Weather Service in Mount Holly has issued a

* Flood Warning for
  the East Branch Brandywine Creek Below Downingtown.
* From this afternoon to this evening.
* At 3:31 PM EST Monday the stage was 7.1 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 3:31 PM EST Monday was 7.1 feet.
* Forecast...The river will fall below flood stage late tonight to 
  6.9 feet and then begin rising late this afternoon. It will then 
  rise above flood stage late this afternoon to 8.8 feet late this 
  evening. It will fall below flood stage again late tonight.
* 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 (4 pm)        Crest
Location        Stg   Stg Day/Time    Tue  Wed        Stg Time Date

East Branch Bran
Downingtown     7.0   7.1  Mon 3 pm   5.1  MSG        8.8 9pm 11/30





&&

LAT...LON 4002 7567 3993 7561 3991 7567 4001 7574

$$

PO
2 follow-up statements
012 
WGUS41 KPHI 010109
FLWPHI

BULLETIN - EAS ACTIVATION REQUESTED
Flood Warning
National Weather Service Mount Holly NJ
809 PM EST Mon Nov 30 2020

...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.

A Flood Warning means that flooding is imminent or occurring. All 
interested parties should take necessary precautions immediately.

Turn around...don't drown when encountering flooded roads. Most 
flood deaths occur in vehicles.

Additional information is available at www.weather.gov/phi.


PAC029-011315-
/O.EXT.KPHI.FL.W.0038.000000T0000Z-201201T1543Z/
/DWNP1.2.ER.201130T2021Z.201201T0200Z.201201T0943Z.NO/
809 PM EST Mon Nov 30 2020

...Forecast flooding increased from Minor to Moderate severity and 
increased in duration until late tomorrow morning...

The Flood Warning continues for
  the East Branch Brandywine Creek Below Downingtown.
* Until Tuesday morning.
* At 7:45 PM EST Monday the stage was 9.0 feet.
* Flood stage is 7.0 feet.
* Moderate flooding is occurring and moderate flooding is forecast.
* Recent Activity...The maximum river stage in the 24 hours ending 
  at 7:45 PM EST Monday was 9.0 feet.
* Forecast...The river is expected to fall below flood stage late 
  tonight and continue falling to 5.1 feet early Wednesday 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.
* Flood History...This crest compares to a previous crest of 9.2 
  feet on 10/23/2003.

&&


Stream          Fld   Observed        Fcsts (8 pm)        Crest
Location        Stg   Stg Day/Time    Tue             Stg Time Date

East Branch Bran
Downingtown     7.0   9.0  Mon 7 pm   5.1             9.2 9pm 11/30





&&

LAT...LON 4002 7567 3993 7561 3991 7567 4001 7574

$$

PO
905 
WGUS81 KPHI 010226
FLSPHI

Flood Statement
National Weather Service Mount Holly NJ
926 PM EST Mon Nov 30 2020

...The Flood Warning continues for the East Branch Brandywine Creek 
below Downingtown...
PRECAUTIONARY/PREPAREDNESS ACTIONS...

Motorists should not attempt to drive around barricades or through 
flooded areas.

Additional information is available at www.weather.gov/phi.


PAC029-011115-
/O.EXT.KPHI.FL.W.0038.000000T0000Z-201201T1102Z/
/DWNP1.1.ER.201130T2021Z.201201T0045Z.201201T0502Z.NO/
926 PM EST Mon Nov 30 2020

...The Flood Warning is now in effect until tomorrow morning...

The Flood Warning continues for
  the East Branch Brandywine Creek Below Downingtown.
* Until Tuesday morning.
* At 8:45 PM EST Monday the stage was 8.8 feet.
* Flood stage is 7.0 feet.
* Minor flooding is occurring and is forecast to continue.
* Forecast...The river is expected to fall below flood stage just 
  after midnight.

* Impact at 8.0 feet...Dowlin Forge Road floods.

&&


Stream          Fld   Observed        Fcsts (9 pm)        Crest
Location        Stg   Stg Day/Time    Tue  Wed        Stg Time Date

East Branch Bran
Downingtown     7.0   8.8  Mon 8 pm   3.3  MSG        Crested  





&&

LAT...LON 4002 7567 3993 7561 3991 7567 4001 7574

$$

Iovino

The office that day

Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Nov 30, 12:15 PM ESTAreal Flood AdvisoryPHIChester, Delaware3 hr
Nov 30, 12:41 PM ESTSpecial Weather StatementPHIChester, Montgomery49 min
Nov 30, 2:17 PM ESTAreal Flood WarningPHIBerks, Bucks, Lehigh, Montgomery9 hr
Nov 30, 2:18 PM ESTCoastal Flood AdvisoryPHIBucks, Delaware, Philadelphia2 hr
Nov 30, 2:41 PM ESTSevere Thunderstorm WarningPHIChester, Delaware49 min
Nov 30, 2:48 PM ESTAreal Flood WarningPHIChester, Delaware, Montgomery8 hr
Nov 30, 3:01 PM ESTSevere Thunderstorm WarningPHIChester, Delaware, Montgomery, Philadelphia44 min
Nov 30, 3:26 PM ESTAreal Flood WarningPHIBerks, Bucks, Carbon, Lehigh, Monroe, Northampton4 hr
Nov 30, 3:43 PM ESTSevere Thunderstorm WarningPHIBerks, Bucks, Lehigh, Monroe, Montgomery, Northampton and 1 more47 min
Nov 30, 3:53 PM ESTAreal Flood WarningPHIMonroe, Northampton16 hr
Nov 30, 3:53 PM ESTTornado WarningPHIBucks, Montgomery13 min
Nov 30, 4:17 PM ESTAreal Flood WarningPHIBucks, Delaware, Montgomery, Philadelphia10 hr
Nov 30, 5:30 PM ESTRiver Flood WarningPHIChester, Delaware16 hr
Nov 30, 5:33 PM ESTRiver Flood WarningPHIMontgomery10 hr
Nov 30, 5:35 PM ESTRiver Flood WarningPHIDelaware4 hr

Nearby

River Flood Warnings in Pennsylvania, 2020Every river flood warning in 2020

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.