Alert archive / Pennsylvania / River Flood Warnings in 2018

River Flood Warning 34, NWS Philadelphia/Mount Holly

August 13, 2018Chester County, Pennsylvania

NWS Philadelphia/Mount Holly issued this river flood warning at Aug 13, 2018, 9:21 AM EDT for Chester County, Pennsylvania. It was in force for 10 hr.

The area

The outline as issued.

The facts

Issued: Aug 13, 2018, 9:21 AM EDT (13:21 UTC)
Expired: Aug 13, 2018, 6:59 PM EDT
In force: 10 hr
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Flood severity: Moderate

County Chester County, PA

The radar

The Philadelphia radar (KDIX), 108 km from the middle of the area, began a volume at 13:25 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 11.60 ft at Aug 13, 2018, 1:00 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.

333 
WGUS41 KPHI 131321
FLWPHI
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Flood Warning
National Weather Service Mt Holly NJ
921 AM EDT Mon Aug 13 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.

&&

PAC029-131921-
/O.NEW.KPHI.FL.W.0034.180813T1321Z-180813T2136Z/
/DWNP1.2.ER.180813T1316Z.180813T1400Z.180813T1536Z.NO/
921 AM EDT Mon Aug 13 2018

The National Weather Service in Mount Holly NJ has issued a 

* Flood Warning for 
  The East Branch Brandywine Creek at Downingtown.
* until this afternoon...or until the warning is cancelled.
* At 9:01 AM Monday the stage was 6.2 feet.
* Flood stage is 7.0 feet.
* Moderate flooding is forecast.
* Forecast...Rise above flood stage and continue to rise to 
  near 9.2 feet this morning. The river will fall below flood
  stage late this morning.
* 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 Oct 23 2003.  
 
&&

                         FLD    OBSERVED           FORECAST
 LOCATION                STG    STG   DAY TIME     CREST

Brandywine Creek
  Downingtown            7.0    6.22  Mon 9 AM     9.2    Mon 10 AM
 
&&
 
LAT...LON 4002 7567 3993 7561 3991 7567 4001 7574
                                      

$$

Kruzdlo

3 follow-up statements

320 
WGUS41 KPHI 131535
FLWPHI
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Flood Warning
National Weather Service Mt Holly NJ
1135 AM EDT Mon Aug 13 2018

  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.

&&

PAC029-132135-
/O.EXT.KPHI.FL.W.0034.000000T0000Z-180813T2237Z/
/DWNP1.2.ER.180813T1314Z.180813T1600Z.180813T1637Z.NO/
1135 AM EDT Mon Aug 13 2018

The Flood Warning continues for 
 The East Branch Brandywine Creek at Downingtown.
* until this evening...or until the warning is cancelled.
* At 11:01 AM Monday the stage was 9.8 feet.
* Flood stage is 7.0 feet.
* Moderate flooding is occurring and Moderate flooding is forecast.
* Forecast...The river will continue rising to near 10.6 feet by this afternoon.
  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 9.6 feet on Mar 4 
  1993.  

 
&&

                         FLD    OBSERVED           FORECAST
 LOCATION                STG    STG  DAY TIME      CREST

Brandywine Creek
  Downingtown            7.0    9.80  Mon 11 AM   10.6    Mon 12 PM
 
&&
 
LAT...LON 4002 7567 3993 7561 3991 7567 4001 7574
                                      

$$

084 
WGUS41 KPHI 131706
FLWPHI
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Flood Warning
National Weather Service Mt Holly NJ
106 PM EDT Mon Aug 13 2018

...Forecast flooding changed from Moderate to Major 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.

&&

PAC029-132307-
/O.EXT.KPHI.FL.W.0034.000000T0000Z-180814T0226Z/
/DWNP1.3.ER.180813T1314Z.180813T1645Z.180813T2026Z.NO/
106 PM EDT Mon Aug 13 2018

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

The Flood Warning continues for 
 The East Branch Brandywine Creek at Downingtown.
* Until this evening...or until the warning is cancelled.
* At 12:45 PM Monday the stage was 11.6 feet.
* Flood stage is 7.0 feet.
* Major flooding is occurring and Major flooding is forecast.
* Forecast...The river will fall below flood stage later this 
  afternoon.
* Impact...At 12.0 feet...Residential basements flood along Jefferson
  Avenue.
* Flood history...This crest compares to a previous crest of 11.7 feet
  on Sep 8 2011.  

 
&&

                         FLD    OBSERVED           FORECAST
 LOCATION                STG    STG   DAY TIME     CREST

Brandywine Creek
  Downingtown            7.0    11.59  Mon 1 PM    Beginning to crest 
 
&&
 
LAT...LON 4002 7567 3993 7561 3991 7567 4001 7574
                                      

$$

Kruzdlo

679 
WGUS81 KPHI 132259
FLSPHI
Flood Statement
National Weather Service Mt Holly NJ
659 PM EDT Mon Aug 13 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.

&&

PAC029-132329-
/O.CAN.KPHI.FL.W.0034.000000T0000Z-180814T0226Z/
/DWNP1.3.ER.180813T1314Z.180813T1645Z.180813T2229Z.NO/
659 PM EDT Mon Aug 13 2018

The Flood Warning is cancelled for
  The East Branch Brandywine Creek at Downingtown.
* Flood stage is 7.00 feet. 
* Forecast...The river will continue to fall overnight.
 
&&

                         FLD    OBSERVED           FORECAST
 LOCATION                STG    STG  DAY TIME      CREST

Brandywine Creek
  Downingtown            7.0    Missing            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
Aug 12, 10:08 PM EDT	Flash Flood Watch	PHI	Berks, Bucks, Carbon, Chester, Delaware, Lehigh and 4 more	24 hr
Aug 13, 4:42 AM EDT	Areal Flood Advisory	PHI	Berks	4 hr
Aug 13, 5:12 AM EDT	Areal Flood Advisory	PHI	Chester	103 min
Aug 13, 6:24 AM EDT	Areal Flood Advisory	PHI	Berks, Chester, Delaware, Montgomery	4 hr
Aug 13, 6:50 AM EDT	Flash Flood Warning	PHI	Berks, Chester, Delaware, Montgomery	6 hr
Aug 13, 8:03 AM EDT	Areal Flood Advisory	PHI	Delaware, Montgomery, Philadelphia	4 hr
Aug 13, 8:43 AM EDT	Flash Flood Warning	PHI	Bucks, Delaware, Lehigh, Montgomery, Northampton, Philadelphia	4 hr
Aug 13, 10:40 AM EDT	Areal Flood Advisory	PHI	Carbon, Monroe, Northampton	42 min
Aug 13, 11:05 AM EDT	River Flood Warning	PHI	Chester, Delaware	30 hr
Aug 13, 11:21 AM EDT	Areal Flood Warning	PHI	Carbon, Monroe, Northampton	4 hr
Aug 13, 12:14 PM EDT	River Flood Warning	PHI	Berks, Montgomery	23 hr
Aug 13, 12:14 PM EDT	River Flood Warning	PHI	Montgomery	28 hr
Aug 13, 12:14 PM EDT	River Flood Warning	PHI	Chester, Montgomery, Philadelphia	52 hr
Aug 13, 12:37 PM EDT	Areal Flood Warning	PHI	Berks, Bucks, Chester, Delaware, Lehigh, Montgomery and 1 more	18 hr
Aug 13, 3:07 PM EDT	River Flood Warning	PHI	Montgomery	6 hr
Aug 13, 4:57 PM EDT	Areal Flood Advisory	PHI	Carbon, Monroe, Northampton	3 hr
Aug 13, 5:09 PM EDT	River Flood Warning	PHI	Montgomery, Philadelphia	31 hr
Aug 13, 7:27 PM EDT	Areal Flood Warning	PHI	Carbon, Northampton	7 hr
Aug 13, 7:42 PM EDT	Severe Thunderstorm Warning	PHI	Chester	48 min

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.