Alert archive / Pennsylvania / River Flood Warnings in 2018

River Flood Warning 26, NWS Philadelphia/Mount Holly

August 4, 2018Chester County, Pennsylvania

NWS Philadelphia/Mount Holly issued this river flood warning at Aug 4, 2018, 6:45 AM EDT for Chester County, Pennsylvania. It took effect at Aug 4, 2018, 7:25 AM EDT. It was in force for 4 hr.

The area

The outline as issued.

The facts

Issued: Aug 4, 2018, 6:45 AM EDT (10:45 UTC)
In effect from: Aug 4, 2018, 7:25 AM EDT
Expired: Aug 4, 2018, 11:03 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 10:45 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 7.05 ft at Aug 4, 2018, 9:00 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.

916 
WGUS41 KPHI 041045
FLWPHI
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Flood Warning
National Weather Service Mt Holly NJ
645 AM EDT Sat Aug 4 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.

&&

PAC029-041645-
/O.NEW.KPHI.FL.W.0026.180804T1125Z-180804T2015Z/
/DWNP1.1.ER.180804T1125Z.180804T1300Z.180804T1415Z.NO/
645 AM EDT Sat Aug 4 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 6:31 AM Saturday the stage was 6.2 feet.
* Flood stage is 7.0 feet.
* Minor flooding is forecast.
* Forecast...Rise above flood stage by this morning and continue to rise to near
  7.3 feet by late this morning. The river will fall below flood stage by midday.
* 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    6.15  Sat 7 AM     7.3    Sat 9 AM 
 
&&
 
LAT...LON 4002 7567 3993 7561 3991 7567 4001 7574
                                      

$$

CMS

1 follow-up statement

086 
WGUS81 KPHI 041503
FLSPHI
Flood Statement
National Weather Service Mt Holly NJ
1103 AM EDT Sat Aug 4 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.

&&

PAC029-041533-
/O.CAN.KPHI.FL.W.0026.000000T0000Z-180804T2015Z/
/DWNP1.1.ER.180804T1230Z.180804T1300Z.180804T1308Z.NO/
1103 AM EDT Sat Aug 4 2018

The Flood Warning is cancelled for
  The East Branch Brandywine Creek at Downingtown.
* At 10:45 AM Saturday the stage was 6.3 feet.
* Flood stage is 7.0 feet.
* Fell below flood stage at  9:08 AM Saturday.
* Forecast...The river will continue to fall to 2.8 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    6.31  Sat 11 AM    Falling
 
&&
 
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 3, 8:35 PM EDT	Areal Flood Advisory	PHI	Carbon	4 hr
Aug 3, 9:03 PM EDT	Flash Flood Warning	PHI	Berks	8 hr
Aug 3, 9:10 PM EDT	Areal Flood Advisory	PHI	Monroe, Northampton	4 hr
Aug 3, 10:07 PM EDT	Special Weather Statement	PHI	Lehigh, Northampton	53 min
Aug 3, 10:23 PM EDT	Flash Flood Warning	PHI	Lehigh, Northampton	4 hr
Aug 3, 11:24 PM EDT	Areal Flood Advisory	PHI	Berks, Lehigh	6 hr
Aug 4, 12:24 AM EDT	Areal Flood Advisory	PHI	Carbon	4 hr
Aug 4, 1:08 AM EDT	Areal Flood Advisory	PHI	Monroe	4 hr
Aug 4, 1:15 AM EDT	Special Weather Statement	PHI	Berks	30 min
Aug 4, 1:47 AM EDT	Special Weather Statement	PHI	Berks, Lehigh	43 min
Aug 4, 1:59 AM EDT	Areal Flood Advisory	PHI	Chester	4 hr
Aug 4, 2:22 AM EDT	Areal Flood Warning	PHI	Lehigh, Northampton	21 hr
Aug 4, 2:27 AM EDT	Special Weather Statement	PHI	Lehigh, Northampton	63 min
Aug 4, 4:54 AM EDT	Areal Flood Warning	PHI	Berks	7 hr
Aug 4, 5:09 AM EDT	Areal Flood Advisory	PHI	Monroe	2 hr
Aug 4, 5:45 AM EDT	Areal Flood Advisory	PHI	Bucks, Chester, Montgomery	7 hr
Aug 4, 6:55 AM EDT	Areal Flood Advisory	PHI	Bucks, Montgomery	4 hr
Aug 4, 8:48 AM EDT	Areal Flood Warning	PHI	Chester, Montgomery	4 hr
Aug 4, 9:20 AM EDT	River Flood Warning	PHI	Montgomery	3 hr
Aug 4, 11:55 AM EDT	River Flood Warning	PHI	Chester, Montgomery, Philadelphia	12 hr
Aug 4, 4:41 PM EDT	Severe Thunderstorm Warning	PHI	Northampton	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.