Alert archive / Pennsylvania / River Flood Warnings in 2018

River Flood Warning 80, NWS Philadelphia/Mount Holly

December 16, 2018Chester County, Pennsylvania

NWS Philadelphia/Mount Holly issued this river flood warning at Dec 16, 2018, 7:25 AM EST for Chester County, Pennsylvania. It took effect at Dec 16, 2018, 7:46 AM EST. It was in force for 75 min.

The area

The outline as issued.

The facts

Issued
Dec 16, 2018, 7:25 AM EST (12:25 UTC)
In effect from
Dec 16, 2018, 7:46 AM EST
Expired
Dec 16, 2018, 9:01 AM EST
In force
75 min
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 12:24 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 6.80 ft at Dec 16, 2018, 7:00 AM EST.

actionminormoderate24681012/1612/17
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.

640 
WGUS41 KPHI 161225
FLWPHI
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Flood Warning
National Weather Service Mt Holly NJ
725 AM EST Sun Dec 16 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.

&&

PAC029-161824-
/O.NEW.KPHI.FL.W.0080.181216T1246Z-181216T2151Z/
/DWNP1.1.ER.181216T1246Z.181216T1400Z.181216T1551Z.NO/
725 AM EST Sun Dec 16 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  7:01 AM Sunday the stage was 6.8 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
  7.2 feet by late 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 7.0 feet on Aug 4 
  2018.  

 
&&

                         FLD    OBSERVED           FORECAST
 LOCATION                STG    STG  DAY TIME      CREST

Brandywine Creek
  Downingtown            7.0    6.80  Sun 7 AM     7.2    Sun 9 AM 
 
&&
 
LAT...LON 4002 7567 3993 7561 3991 7567 4001 7574
                                      

$$

SFJ
1 follow-up statement
082 
WGUS81 KPHI 161401
FLSPHI
Flood Statement
National Weather Service Mt Holly NJ
901 AM EST Sun Dec 16 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.

&&

PAC029-161431-
/O.CAN.KPHI.FL.W.0080.000000T0000Z-181216T2151Z/
/DWNP1.N.ER.000000T0000Z.000000T0000Z.000000T0000Z.NO/
901 AM EST Sun Dec 16 2018

The Flood Warning is cancelled for
  The East Branch Brandywine Creek at Downingtown.
* At  8:30 AM Sunday the stage was 6.5 feet.
* Flood stage is 7.0 feet.
* Forecast...The river crested below flood stage at 6.9 feet. The river will 
  continue to gradually fall.
* Impact...At 6.0 feet...Open adjacent land next to the creek floods.
* 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    6.52  Sun 8 AM     6.4    Sun 9 AM 
 
&&
 
LAT...LON 4002 7567 3993 7561 3991 7567 4001 7574
                                      

$$

SFJ

The office that day

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

IssuedProductOfficeCountiesLasted
Dec 16, 12:28 PM ESTAreal Flood AdvisoryPHIChester, Delaware4 hr
Dec 16, 3:41 PM ESTAreal Flood WarningPHIChester4 hr

Nearby

River Flood Warnings in Pennsylvania, 2018Every 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.