Alert archive / Pennsylvania / River Flood Warnings in 2018

River Flood Warning 23, NWS Philadelphia/Mount Holly

July 23, 2018Chester County, Pennsylvania

NWS Philadelphia/Mount Holly issued this river flood warning at Jul 23, 2018, 12:19 AM EDT for Chester County, Pennsylvania. It took effect at Jul 23, 2018, 1:23 AM EDT. It was in force for 4 hr.

The area

The outline as issued.

The facts

Issued: Jul 23, 2018, 12:19 AM EDT (04:19 UTC)
In effect from: Jul 23, 2018, 1:23 AM EDT
Expired: Jul 23, 2018, 5:36 AM EDT
In force: 4 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 04:21 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 9.47 ft at Jul 23, 2018, 3:00 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.

530 
WGUS41 KPHI 230419
FLWPHI
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Flood Warning
National Weather Service Mt Holly NJ
1219 AM EDT Mon Jul 23 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.

&&

PAC029-231018-
/O.NEW.KPHI.FL.W.0023.180723T0523Z-180723T1933Z/
/DWNP1.1.ER.180723T0523Z.180723T0900Z.180723T1333Z.NO/
1219 AM EDT Mon Jul 23 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 11:46 PM Sunday the stage was 6.1 feet.
* Flood stage is 7.0 feet.
* Minor flooding is forecast.
* Forecast...Rise above flood stage by after midnight this morning and continue 
  to rise to near 8.1 feet by early this morning.the river will fall below flood
  stage by late this morning.
* Impact...At 8.0 feet...Dowlin Forge Road begins to flood.
* Flood history...This crest compares to a previous crest of 8.2 feet on Jun 11 
  2018.  

 
&&

                         FLD    OBSERVED           FORECAST
 LOCATION                STG    STG  DAY TIME      CREST

Brandywine Creek
  Downingtown            7.0    6.08  Mon 12 AM    8.1    Mon 5 AM 
 
&&
 
LAT...LON 4002 7567 3993 7561 3991 7567 4001 7574
                                      

$$

2 follow-up statements

227 
WGUS41 KPHI 230602
FLWPHI
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Flood Warning
National Weather Service Mt Holly NJ
202 AM EDT Mon Jul 23 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.

&&

PAC029-231201-
/O.EXT.KPHI.FL.W.0023.000000T0000Z-180723T2335Z/
/DWNP1.2.ER.180723T0412Z.180723T0900Z.180723T1735Z.NO/
202 AM EDT Mon Jul 23 2018

...Forecast flooding increased from Minor to Moderate severity...
The Flood Warning continues for 
 The East Branch Brandywine Creek Below Downingtown.
* until this evening...Or until the warning is cancelled.
* At  1:45 AM Monday the stage was 8.9 feet.
* Flood stage is 7.0 feet.
* Minor flooding is occurring and Moderate flooding is forecast.
* Forecast...The river will continue rising to near 10.1 feet by early this 
  morning. The river will fall below flood stage this afternoon.
* 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 10.1 feet on Sep 18 
  2004.  

 
&&

                         FLD    OBSERVED           FORECAST
 LOCATION                STG    STG  DAY TIME      CREST

Brandywine Creek
  Downingtown            7.0    8.88  Mon 2 AM    10.1    Mon 5 AM 
 
&&
 
LAT...LON 4002 7567 3993 7561 3991 7567 4001 7574
                                      

$$

295 
WGUS81 KPHI 230936
FLSPHI
Flood Statement
National Weather Service Mt Holly NJ
536 AM EDT Mon Jul 23 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.

&&

PAC029-231006-
/O.CAN.KPHI.FL.W.0023.000000T0000Z-180723T2335Z/
/DWNP1.2.ER.180723T0412Z.180723T0700Z.180723T0857Z.NO/
536 AM EDT Mon Jul 23 2018

The Flood Warning is cancelled for
  The East Branch Brandywine Creek at Downingtown.
* At  5:02 AM Monday the stage was 6.8 feet and falling. 
* Flood stage is 7.0 feet.
* Fell below flood stage at  4:57 AM Monday.
* Forecast...The river will continue to fall to 2.9 feet by tomorrow morning.
* Impact...At 6.0 feet...Open adjacent land next to the creek floods.

 
&&

                         FLD    OBSERVED           FORECAST
 LOCATION                STG    STG  DAY TIME      CREST

Brandywine Creek
  Downingtown            7.0    6.85  Mon 5 AM     4.8    Mon 6 AM 
 
&&
 
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
Jul 22, 8:18 PM EDT	Areal Flood Warning	PHI	Chester	117 min
Jul 22, 8:43 PM EDT	Flash Flood Warning	PHI	Chester	4 hr
Jul 22, 8:54 PM EDT	Flash Flood Warning	PHI	Berks, Chester	4 hr
Jul 22, 9:40 PM EDT	Flash Flood Warning	PHI	Lehigh	3 hr
Jul 22, 10:21 PM EDT	Special Weather Statement	PHI	Monroe	54 min
Jul 22, 11:18 PM EDT	Areal Flood Advisory	PHI	Carbon, Monroe, Northampton	3 hr
Jul 23, 3:45 AM EDT	Flash Flood Watch	PHI	Berks, Bucks, Carbon, Chester, Delaware, Lehigh and 4 more	68 hr
Jul 23, 7:00 AM EDT	River Flood Warning	PHI	Chester, Delaware	9 hr
Jul 23, 12:58 PM EDT	Special Weather Statement	PHI	Chester	32 min
Jul 23, 1:01 PM EDT	Areal Flood Advisory	PHI	Chester	34 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.