Alert archive / Pennsylvania / River Flood Warnings in 2018

River Flood Warning 16, NWS Philadelphia/Mount Holly

May 17, 2018Chester County, Delaware County, Pennsylvania

NWS Philadelphia/Mount Holly issued this river flood warning at May 17, 2018, 10:04 AM EDT for Chester County, Delaware County, Pennsylvania. It took effect at May 17, 2018, 1:00 PM EDT. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued: May 17, 2018, 10:04 AM EDT (14:04 UTC)
In effect from: May 17, 2018, 1:00 PM EDT
Expired: May 17, 2018, 6:31 PM EDT
In force: 6 hr
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Flood severity: Minor

Counties Chester County, PA, Delaware County, PA

The radar

The Philadelphia radar (KDIX), 102 km from the middle of the area, began a volume at 14:04 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 Brandywine Creek at Chadds Ford (CDFP1).

Action stage: 8 ft
Minor stage: 9 ft
Moderate stage: 11 ft
Major stage: 13 ft

This gauge today: stage, forecast and historic crests

Stage from the USGS instantaneous record for site 01481000, 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.

112 
WGUS41 KPHI 171404
FLWPHI
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Flood Warning
National Weather Service Mt Holly NJ
1004 AM EDT Thu May 17 2018

...The National Weather Service in Mount Holly NJ has issued a
flood warning for the following rivers in Pennsylvania...

  Brandywine Creek At Chadds Ford affecting Chester and Delaware
  Counties

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SAFETY MESSAGE...Do not attempt to drive through flooded areas. 
The water may be deeper than you think.

&&

PAC029-045-172004-
/O.NEW.KPHI.FL.W.0016.180517T1700Z-180518T0036Z/
/CDFP1.1.ER.180517T1700Z.180517T1800Z.180517T1836Z.NO/
1004 AM EDT Thu May 17 2018

The National Weather Service in Mount Holly NJ has issued a 

* Flood Warning for 
  The Brandywine Creek at Chadds Ford.
* until this evening...or until the warning is cancelled.
* At 9:30 AM Thursday the stage was 7.6 feet.
* Flood stage is 9.0 feet.
* Minor flooding is forecast.
* Forecast...Rise above flood stage early this afternoon and continue
  to rise to near 9.2 feet. The river will fall below flood stage by
  this afternoon.
 
&&

                         FLD    OBSERVED           FORECAST
 LOCATION                STG    STG   DAY TIME     CREST

Brandywine Creek
  Chadds Ford            9.0    7.63  Thu 9 AM     9.2    Thu 2 PM 
 
&&
 
LAT...LON 3993 7561 3982 7553 3979 7560 3991 7567
                                      

$$

Kruzdlo

2 follow-up statements

785 
WGUS81 KPHI 171935
FLSPHI
Flood Statement
National Weather Service Mt Holly NJ
335 PM EDT Thu May 17 2018

...The Flood Warning continues for the following rivers in
   Pennsylvania...

  Brandywine Creek At Chadds Ford affecting Chester and Delaware 
  Counties

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SAFETY MESSAGE...Do not attempt to drive through flooded areas.
The water may be deeper than you think.

&&

PAC029-045-180300-
/O.EXT.KPHI.FL.W.0016.000000T0000Z-180518T0300Z/
/CDFP1.1.ER.180517T2100Z.180517T2100Z.180517T2100Z.NO/
335 PM EDT Thu May 17 2018

The Flood Warning continues for
  The Brandywine Creek at Chadds Ford.
* At 2:30 PM Thursday the stage was 8.9 feet.
* Flood stage is 9.0 feet.
* Forecast...The river is expected to rise to near flood stage 
  late this afternoon.
* Impact...At 10.0 feet...The intersections of Creek Road and Route
  926 near Pocopson floods upstream of Chadds Ford.
* Flood history...This crest compares to a previous crest of 9.2 feet
  on Apr 2 1998.  
 
&&

                         FLD    OBSERVED           FORECAST
 LOCATION                STG    STG   DAY TIME     CREST

Brandywine Creek
  Chadds Ford            9.0    8.91  Thu 2 PM     9.0    Thu 5 PM 
 
&&
 
LAT...LON 3993 7561 3982 7553 3979 7560 3991 7567
                                      

$$

Kruzdlo

356 
WGUS81 KPHI 172231
FLSPHI
Flood Statement
National Weather Service Mt Holly NJ
631 PM EDT Thu May 17 2018

...The Flood Warning is cancelled for the following rivers in Pennsylvania...

  Brandywine Creek At Chadds Ford affecting Chester and Delaware Counties

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SAFETY MESSAGE...Do not attempt to drive through flooded areas. The water may be
deeper than you think.

&&

PAC029-045-172301-
/O.CAN.KPHI.FL.W.0016.000000T0000Z-180518T0300Z/
/CDFP1.1.ER.180517T2000Z.180517T2000Z.180517T2000Z.NO/
631 PM EDT Thu May 17 2018

The Flood Warning is cancelled for
  The Brandywine Creek at Chadds Ford.
* At  5:30 PM Thursday the stage was 8.7 feet.
* Flood stage is 9.0 feet.
* Fell below flood stage at  4:00 PM Thursday.
 
&&

                         FLD    OBSERVED           FORECAST
 LOCATION                STG    STG  DAY TIME      CREST

Brandywine Creek
  Chadds Ford            9.0    8.71  Thu 5 PM     Crested and falling
 
&&
 
LAT...LON 3993 7561 3982 7553 3979 7560 3991 7567
                                      

$$

LF

The office that day

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

Issued	Product	Office	Counties	Lasted
May 17, 2:32 AM EDT	Areal Flood Advisory	PHI	Bucks, Chester, Delaware, Montgomery, Philadelphia	4 hr
May 17, 4:26 AM EDT	Areal Flood Advisory	PHI	Bucks	4 hr
May 17, 5:16 AM EDT	Areal Flood Warning	PHI	Chester, Montgomery	6 hr
May 17, 6:01 AM EDT	River Flood Warning	PHI	Chester	7 hr
May 17, 6:29 AM EDT	Areal Flood Advisory	PHI	Bucks, Delaware, Montgomery, Philadelphia	2 hr
May 17, 9:50 AM EDT	River Flood Warning	PHI	Bucks	3 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.