Alert archive / Pennsylvania / River Flood Warnings in 2020

River Flood Warning 17, NWS Philadelphia/Mount Holly

August 4, 2020Chester County, Pennsylvania

NWS Philadelphia/Mount Holly issued this river flood warning at Aug 4, 2020, 12:06 PM EDT for Chester County, Pennsylvania. It was in force for 11 hr.

The area

The outline as issued.

The facts

Issued: Aug 4, 2020, 12:06 PM EDT (16:06 UTC)
Expired: Aug 4, 2020, 11:20 PM EDT
In force: 11 hr
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Flood severity: Major

County Chester County, PA

The radar

The Philadelphia radar (KDIX), 108 km from the middle of the area, began a volume at 16:06 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 13.42 ft at Aug 4, 2020, 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.

243 
WGUS41 KPHI 041606
FLWPHI
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Flood Warning
National Weather Service Mt Holly NJ
1206 PM EDT Tue Aug 4 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

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SAFETY MESSAGE...Do not attempt to drive through flooded areas. The water may be
deeper than you think.

&&

PAC029-042206-
/O.NEW.KPHI.FL.W.0017.200804T1606Z-200805T0115Z/
/DWNP1.3.ER.200804T1536Z.200804T1700Z.200804T1915Z.NO/
1206 PM EDT Tue Aug 4 2020

The National Weather Service in Mount Holly NJ has issued a 

* Flood Warning for 
  The East Branch Brandywine Creek at Downingtown.
* Until this evening...or until the warning is cancelled.
* At 11:45 AM Tuesday the stage was 7.6 feet.
* Flood stage is 7.0 feet.
* Minor flooding is occurring and Major flooding is forecast.
* Forecast...The river will continue rising to near 11.3 feet
  by this afternoon. The river will fall below flood stage 
  later today.
* 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 
  11.6 feet on Aug 13 2018.  
 
&&

                         FLD    OBSERVED           FORECAST
 LOCATION                STG    STG   DAY TIME     CREST

Brandywine Creek
  Downingtown            7.0    7.60  Tue 12 PM    11.3    Tue 1 PM 
 
&&
 
LAT...LON 4002 7567 3993 7561 3991 7567 4001 7574
                                      

$$

Kruzdlo

2 follow-up statements

364 
WGUS81 KPHI 042159
FLSPHI
Flood Statement
National Weather Service Mt Holly NJ
559 PM EDT Tue Aug 4 2020

...The Flood Warning continues for the following rivers in Pennsylvania...

  East Branch Brandywine Creek Below Downingtown affecting Chester County

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SAFETY MESSAGE...Do not attempt to drive through flooded areas. The water may be
deeper than you think.

&&

PAC029-050759-
/O.EXT.KPHI.FL.W.0017.000000T0000Z-200805T1044Z/
/DWNP1.3.ER.200804T1536Z.200804T2200Z.200805T0444Z.NO/
559 PM EDT Tue Aug 4 2020

...Flood Warning extended until Wednesday morning...The Flood Warning continues 
for
  The East Branch Brandywine Creek at Downingtown.
* until Wednesday morning...Or until the warning is cancelled.
* At  5:45 PM Tuesday the stage was 13.1 feet.
* Flood stage is 7.0 feet.
* Major flooding is occurring and Major flooding is forecast.
* Forecast...The river will continue rising to near 13.6 feet by this evening. 
  The river will fall below flood stage after midnight tonight.
* 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 13.6 feet on Sep 15 
  2003.  

 
&&

                         FLD    OBSERVED           FORECAST
 LOCATION                STG    STG  DAY TIME      CREST

Brandywine Creek
  Downingtown            7.0   13.12  Tue 6 PM    13.6    Tue 6 PM 
 
&&
 
LAT...LON 4002 7567 3993 7561 3991 7567 4001 7574
                                      

$$

466 
WGUS81 KPHI 050320
FLSPHI
Flood Statement
National Weather Service Mt Holly NJ
1120 PM EDT Tue Aug 4 2020

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

  East Branch Brandywine Creek Below Downingtown affecting Chester County

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SAFETY MESSAGE...Do not attempt to drive through flooded areas. The water may be
deeper than you think.

&&

PAC029-050350-
/O.CAN.KPHI.FL.W.0017.000000T0000Z-200805T1044Z/
/DWNP1.3.ER.200804T1536Z.200804T2031Z.200805T0134Z.NO/
1120 PM EDT Tue Aug 4 2020

The Flood Warning is cancelled for
  The East Branch Brandywine Creek at Downingtown.
* At 10:45 PM Tuesday the stage was 5.8 feet.
* Flood stage is 7.0 feet.
* Fell below flood stage at  9:34 PM Tuesday.
* Forecast...The river will continue to fall to 3.2 feet by Thursday morning.
* Impact...At 8.0 feet...Dowlin Forge Road begins to flood.
* Flood history...This crest compares to a previous crest of 7.0 feet on Aug 4 
  2018.  

 
&&

                         FLD    OBSERVED           FORECAST
 LOCATION                STG    STG  DAY TIME      CREST

Brandywine Creek
  Downingtown            7.0    5.84  Tue 11 PM    Crested
 
&&
 
LAT...LON 4002 7567 3993 7561 3991 7567 4001 7574
                                      

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 4, 5:17 AM EDT	Areal Flood Advisory	PHI	Bucks, Chester, Delaware, Montgomery, Philadelphia	4 hr
Aug 4, 7:23 AM EDT	Tornado Warning	PHI	Chester, Delaware, Montgomery, Philadelphia	20 min
Aug 4, 7:28 AM EDT	Flash Flood Warning	PHI	Chester, Delaware, Montgomery	3 hr
Aug 4, 8:11 AM EDT	Flash Flood Warning	PHI	Bucks, Lehigh, Montgomery, Northampton	4 hr
Aug 4, 8:19 AM EDT	River Flood Warning	PHI	Delaware	15 hr
Aug 4, 8:19 AM EDT	Tornado Warning	PHI	Bucks	26 min
Aug 4, 9:23 AM EDT	Tornado Warning Tornado observed	PHI	Chester	22 min
Aug 4, 9:29 AM EDT	Tornado Warning	PHI	Monroe, Northampton	31 min
Aug 4, 9:38 AM EDT	Flash Flood Warning	PHI	Monroe, Northampton	4 hr
Aug 4, 9:58 AM EDT	Tornado Warning	PHI	Monroe	16 min
Aug 4, 10:02 AM EDT	Flash Flood Warning	PHI	Chester, Delaware	4 hr
Aug 4, 10:20 AM EDT	Flash Flood Warning	PHI	Bucks, Chester, Delaware, Montgomery, Philadelphia	4 hr
Aug 4, 10:51 AM EDT	Tornado Warning	PHI	Montgomery	24 min
Aug 4, 11:01 AM EDT	Flash Flood Warning	PHI	Bucks	4 hr
Aug 4, 11:13 AM EDT	Areal Flood Advisory	PHI	Berks, Carbon, Lehigh, Monroe, Northampton	4 hr
Aug 4, 11:43 AM EDT	Flash Flood Warning	PHI	Berks, Lehigh, Northampton	4 hr
Aug 4, 12:37 PM EDT	River Flood Warning	PHI	Montgomery	14 hr
Aug 4, 12:48 PM EDT	River Flood Warning	PHI	Chester, Delaware	24 hr
Aug 4, 1:01 PM EDT	River Flood Warning	PHI	Bucks	18 hr
Aug 4, 1:12 PM EDT	River Flood Warning	PHI	Berks	10 hr
Aug 4, 1:12 PM EDT	River Flood Warning	PHI	Montgomery	26 hr
Aug 4, 1:12 PM EDT	River Flood Warning	PHI	Chester, Montgomery, Philadelphia	43 hr
Aug 4, 1:12 PM EDT	River Flood Warning	PHI	Montgomery, Philadelphia	35 hr
Aug 4, 1:59 PM EDT	Areal Flood Warning	PHI	Chester, Delaware	9 hr
Aug 4, 2:09 PM EDT	Areal Flood Warning	PHI	Berks, Chester, Delaware, Montgomery, Philadelphia	15 hr
Aug 4, 2:23 PM EDT	River Flood Warning	PHI	Lehigh	16 hr
Aug 4, 2:47 PM EDT	Areal Flood Warning	PHI	Bucks	9 hr
Aug 4, 3:42 PM EDT	Areal Flood Warning	PHI	Lehigh, Northampton	4 hr
Aug 4, 4:39 PM EDT	River Flood Warning	PHI	Monroe	6 hr
Aug 4, 7:29 PM EDT	Areal Flood Warning	PHI	Lehigh, Northampton	12 hr

Nearby

River Flood Warnings in Pennsylvania, 2020 Every 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.