Alert archive / Pennsylvania / River Flood Warnings in 2020

River Flood Warning 53, NWS Philadelphia/Mount Holly

December 24, 2020Chester County, Pennsylvania

NWS Philadelphia/Mount Holly issued this river flood warning at Dec 24, 2020, 11:26 PM EST for Chester County, Pennsylvania. It took effect at Dec 24, 2020, 11:43 PM EST. It was in force for 13 hr.

The area

The outline as issued.

The facts

Issued
Dec 24, 2020, 11:26 PM EST (04:26 UTC)
In effect from
Dec 24, 2020, 11:43 PM EST
Expired
Dec 25, 2020, 12:42 PM EST
In force
13 hr
Issued by
NWS Philadelphia/Mount Holly
Area
Storm-based polygon
Flood severity
Minor

County Chester County, PA

The radar

The Philadelphia radar (KDIX), 107 km from the middle of the area, began a volume at 04:29 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 10.09 ft at Dec 25, 2020, 4:00 AM EST.

actionminormoderatemajor51012/2512/26
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.

340 
WGUS41 KPHI 250426
FLWPHI

BULLETIN - EAS ACTIVATION REQUESTED
Flood Warning
National Weather Service Mount Holly NJ
1126 PM EST Thu Dec 24 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...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.

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


PAC029-251200-
/O.NEW.KPHI.FL.W.0053.201225T0443Z-201225T1200Z/
/DWNP1.1.ER.201225T0443Z.201225T0600Z.201225T0836Z.NO/
1126 PM EST Thu Dec 24 2020

The National Weather Service in Mount Holly has issued a

* Flood Warning for
  the East Branch Brandywine Creek Below Downingtown.
* Until Friday morning.
* At 11:17 PM EST Thursday the stage was 6.3 feet.
* Flood stage is 7.0 feet.
* Minor flooding is forecast.
* Forecast...The river will rise above flood stage late this evening 
  to 8.0 feet just after midnight tonight. It will then fall below 
  flood stage late tonight to 4.3 feet and begin rising again early 
  tomorrow afternoon. It will rise to 4.4 feet early tomorrow 
  afternoon. It will then fall to 4.1 feet and begin rising again 
  late tomorrow evening. It will then rise again but remain below 
  flood stage.
* Impact at 8.0 feet...Dowlin Forge Road begins to flood.
* Flood History...This crest compares to a previous crest of 8.3 
  feet on 06/04/2003.

&&


Stream          Fld   Observed        Fcsts (11 pm)       Crest
Location        Stg   Stg Day/Time    Fri  Sat        Stg Time Date

East Branch Bran
Downingtown     7.0   6.3  Thu 11 p   4.2  MSG        8.0 1am 12/25





&&

LAT...LON 4002 7567 3993 7561 3990 7567 4001 7573

$$

Iovino
2 follow-up statements
901 
WGUS41 KPHI 250632
FLWPHI

BULLETIN - EAS ACTIVATION REQUESTED
Flood Warning
National Weather Service Mount Holly NJ
132 AM EST Fri Dec 25 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...

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.


PAC029-251845-
/O.EXT.KPHI.FL.W.0053.000000T0000Z-201226T0014Z/
/DWNP1.2.ER.201225T0437Z.201225T1000Z.201225T1814Z.NO/
132 AM EST Fri Dec 25 2020

...Forecast flooding increased from Minor to Moderate severity and 
increased in duration until this evening...

The Flood Warning continues for
  the East Branch Brandywine Creek Below Downingtown.
* Until this evening.
* At 1:17 AM EST Friday the stage was 8.8 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 1:17 AM EST Friday was 8.8 feet.
* Forecast...The river is expected to rise to a crest of 10.8 feet 
  early this morning. It will then fall below flood stage this 
  afternoon.
* 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 10.8 
  feet on 12/17/2000.

&&


Stream          Fld   Observed        Fcsts (2 am)        Crest
Location        Stg   Stg Day/Time    Sat  Sun        Stg Time Date

East Branch Bran
Downingtown     7.0   8.8  Fri 1 am   4.0  MSG        10.8 5am 12/25





&&

LAT...LON 4002 7567 3993 7561 3990 7567 4001 7573

$$

CMS
166 
WGUS81 KPHI 251742
FLSPHI

Flood Statement
National Weather Service Mount Holly NJ
1242 PM EST Fri Dec 25 2020

...The Flood Warning is cancelled for the following rivers in 
Pennsylvania...

  East Branch Brandywine Creek Below Downingtown affecting Chester 
  County.

PAC029-251845-
/O.CAN.KPHI.FL.W.0053.000000T0000Z-201225T1742Z/
/DWNP1.2.ER.201225T0437Z.201225T1000Z.201225T1814Z.NO/
1242 PM EST Fri Dec 25 2020

...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 11:45 AM EST Friday the stage was 6.2 feet.
* Flood stage is 7.0 feet.
* Forecast...The river will continue to fall below this afternoon.

&&


Stream          Fld   Observed        Fcsts (unknown      Crest
Location        Stg   Stg Day/Time    d1   d2         Stg Time Date

East Branch Bran
Downingtown     7.0   6.2  Fri 11 a   MSG  MSG        Crested   





&&

LAT...LON 4002 7567 3993 7561 3990 7567 4001 7573

$$

Kruzdlo

The office that day

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

IssuedProductOfficeCountiesLasted
Dec 24, 8:47 PM ESTAreal Flood AdvisoryPHIChester, Delaware, Montgomery, Philadelphia6 hr
Dec 24, 9:08 PM ESTCoastal Flood AdvisoryPHIBucks, Philadelphia14 hr
Dec 24, 9:16 PM ESTAreal Flood AdvisoryPHIBucks, Lehigh, Northampton3 hr
Dec 24, 9:38 PM ESTAreal Flood WarningPHIChester, Delaware, Montgomery, Philadelphia14 hr
Dec 24, 10:09 PM ESTAreal Flood AdvisoryPHIBerks, Carbon, Lehigh, Monroe, Northampton6 hr
Dec 24, 10:21 PM ESTAreal Flood WarningPHIBucks14 hr
Dec 24, 10:30 PM ESTRiver Flood WarningPHIDelaware10 hr
Dec 24, 11:10 PM ESTAreal Flood AdvisoryPHIBucks4 hr
Dec 24, 11:48 PM ESTAreal Flood WarningPHIBucks15 hr
Dec 24, 11:54 PM ESTAreal Flood WarningPHILehigh, Monroe, Northampton12 hr
Dec 25, 12:36 AM ESTRiver Flood WarningPHIMontgomery13 hr
Dec 25, 12:53 AM ESTAreal Flood WarningPHIChester6 hr
Dec 25, 12:59 AM ESTRiver Flood WarningPHIChester, Montgomery, Philadelphia21 hr
Dec 25, 1:56 AM ESTAreal Flood WarningPHIBucks, Philadelphia7 hr
Dec 25, 2:28 AM ESTRiver Flood WarningPHIBucks15 hr
Dec 25, 3:29 AM ESTAreal Flood WarningPHIBerks6 hr
Dec 25, 3:33 AM ESTRiver Flood WarningPHIChester, Delaware17 hr
Dec 25, 4:00 AM ESTRiver Flood WarningPHILehigh, Northampton16 hr
Dec 25, 4:31 AM ESTAreal Flood WarningPHICarbon, Lehigh, Monroe, Northampton7 hr
Dec 25, 4:53 AM ESTRiver Flood WarningPHIBerks, Montgomery9 hr
Dec 25, 6:32 AM ESTRiver Flood WarningPHIMontgomery, Philadelphia7 hr
Dec 25, 7:28 AM ESTRiver Flood WarningPHIMonroe10 hr
Dec 25, 12:13 PM ESTAreal Flood WarningPHICarbon, Monroe9 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.