Alert archive / Pennsylvania / River Flood Warnings in 2018

River Flood Warning 44, NWS Philadelphia/Mount Holly

September 28, 2018Chester County, Pennsylvania

NWS Philadelphia/Mount Holly issued this river flood warning at Sep 28, 2018, 4:59 AM EDT for Chester County, Pennsylvania. It was in force for 7 hr.

The area

The outline as issued.

The facts

Issued: Sep 28, 2018, 4:59 AM EDT (08:59 UTC)
Expired: Sep 28, 2018, 12:05 PM EDT
In force: 7 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 09:03 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 9.15 ft at Sep 28, 2018, 8:00 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.

253 
WGUS41 KPHI 280859
FLWPHI
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Flood Warning
National Weather Service Mt Holly NJ
459 AM EDT Fri Sep 28 2018

...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.

&&

PAC029-281458-
/O.NEW.KPHI.FL.W.0044.180928T0859Z-180928T1548Z/
/DWNP1.1.ER.180928T0853Z.180928T0900Z.180928T0948Z.NO/
459 AM EDT Fri Sep 28 2018

The National Weather Service in Mount Holly NJ has issued a 

* Flood Warning for 
  The East Branch Brandywine Creek at Downingtown.
* until this morning...or until the warning is cancelled.
* At  4:45 AM Friday the stage was 6.0 feet.
* Flood stage is 7.0 feet.
* Minor flooding is forecast.
* Forecast...Rise above flood stage by early this morning and continue to rise 
  to near 7.8 feet by early this morning.the river will fall below flood stage 
  by early this 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    6.00  Fri 5 AM     7.8    Fri 5 AM 
 
&&
 
LAT...LON 4002 7567 3993 7561 3991 7567 4001 7574
                                      

$$

2 follow-up statements

736 
WGUS41 KPHI 281200
FLWPHI
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Flood Warning
National Weather Service Mt Holly NJ
800 AM EDT Fri Sep 28 2018

...Forecast flooding changed from Minor to Moderate severity 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.

&&

PAC029-281800-
/O.EXT.KPHI.FL.W.0044.000000T0000Z-180928T2342Z/
/DWNP1.2.ER.180928T0921Z.180928T1300Z.180928T1742Z.NO/
800 AM EDT Fri Sep 28 2018

...Forecast flooding increased from Minor to Moderate severity...

The Flood Warning continues for 
 The East Branch Brandywine Creek at Downingtown.
* until this evening...or until the warning is cancelled.
* At 7:45 AM Friday the stage was 9.1 feet.
* Flood stage is 7.0 feet.
* Moderate flooding is occurring.
* Forecast...The river will continue rising to near 9.3 feet by late
  this morning. The river will 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.
* Flood history...This crest compares to a previous crest of 9.3 feet
  on Apr 17 2011.  
 
&&

                         FLD    OBSERVED           FORECAST
 LOCATION                STG    STG   DAY TIME     CREST

Brandywine Creek
  Downingtown            7.0    9.08  Fri 8 AM     9.3    Fri 9 AM 
 
&&
 
LAT...LON 4002 7567 3993 7561 3991 7567 4001 7574
                                      

$$

Kruzdlo

600 
WGUS81 KPHI 281605
FLSPHI
Flood Statement
National Weather Service Mt Holly NJ
1205 PM EDT Fri Sep 28 2018

...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.

&&

PAC029-281635-
/O.CAN.KPHI.FL.W.0044.000000T0000Z-180928T2342Z/
/DWNP1.2.ER.180928T0921Z.180928T1230Z.180928T1448Z.NO/
1205 PM EDT Fri Sep 28 2018

The Flood Warning is cancelled for
  The East Branch Brandywine Creek at Downingtown.
* At 11:45 AM Friday the stage was 6.2 feet.
* Flood stage is 7.0 feet.
* Fell below flood stage at 10:48 AM Friday.
* Forecast...The river will continue to fall.
 
&&

                         FLD    OBSERVED           FORECAST
 LOCATION                STG    STG   DAY TIME     CREST

Brandywine Creek
  Downingtown            7.0    6.17  Fri 12 PM    Crested and falling 
 
&&
 
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 28, 12:10 AM EDT	Areal Flood Advisory	PHI	Berks, Carbon, Lehigh, Monroe, Northampton	13 hr
Sep 28, 1:44 AM EDT	Areal Flood Advisory	PHI	Bucks, Chester, Delaware, Montgomery, Philadelphia	5 hr
Sep 28, 3:13 AM EDT	Areal Flood Warning	PHI	Bucks, Chester, Delaware, Montgomery, Philadelphia	4 hr
Sep 28, 5:33 AM EDT	River Flood Warning	PHI	Montgomery	6 hr
Sep 28, 7:33 AM EDT	Areal Flood Warning	PHI	Bucks, Chester, Delaware, Montgomery, Philadelphia	5 hr
Sep 28, 8:28 AM EDT	River Flood Warning	PHI	Chester, Delaware	13 hr
Sep 28, 8:33 AM EDT	River Flood Warning	PHI	Chester, Montgomery, Philadelphia	7 hr
Sep 28, 12:31 PM EDT	Areal Flood Warning	PHI	Montgomery, Philadelphia	2 hr

Nearby

River Flood Warnings in Pennsylvania, 2018 Every river flood warning in 2018

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.