Alert archive / Pennsylvania / River Flood Warnings in 2018

River Flood Warning 14, NWS Philadelphia/Mount Holly

May 17, 2018Chester County, Pennsylvania

NWS Philadelphia/Mount Holly issued this river flood warning at May 17, 2018, 6:01 AM EDT for Chester County, Pennsylvania. It was in force for 7 hr.

The area

The outline as issued.

The facts

Issued: May 17, 2018, 6:01 AM EDT (10:01 UTC)
Expired: May 17, 2018, 12:55 PM EDT
In force: 7 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 10:03 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 9.05 ft at May 17, 2018, 8:00 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.

409 
WGUS41 KPHI 171001
FLWPHI
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Flood Warning
National Weather Service Mt Holly NJ
601 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...

  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.

&&

PAC029-171600-
/O.NEW.KPHI.FL.W.0014.180517T1001Z-180518T0249Z/
/DWNP1.1.ER.180517T0909Z.180517T1300Z.180517T2049Z.NO/
601 AM EDT Thu May 17 2018

The National Weather Service in Mount Holly NJ has issued a 

* Flood Warning for 
  The East Branch Brandywine Creek at Downingtown.
* until this evening...Or until the warning is cancelled.
* At  5:46 AM Thursday the stage was 7.8 feet.
* Flood stage is 7.0 feet.
* Minor flooding is occurring and Minor flooding is forecast.
* Forecast...The river will continue rising to near 8.9 feet by late this 
  morning. The river will fall below flood stage late 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 8.9 feet on Oct 11 
  2013.  

 
&&

                         FLD    OBSERVED           FORECAST
 LOCATION                STG    STG  DAY TIME      CREST

Brandywine Creek
  Downingtown            7.0    7.80  Thu 6 AM     8.9    Thu 9 AM 
 
&&
 
LAT...LON 4002 7567 3993 7561 3991 7567 4001 7574
                                      

$$

CMS

2 follow-up statements

623 
WGUS41 KPHI 171110
FLWPHI
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Flood Warning
National Weather Service Mt Holly NJ
710 AM EDT Thu May 17 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.

&&

PAC029-171708-
/O.EXT.KPHI.FL.W.0014.000000T0000Z-180518T0322Z/
/DWNP1.2.ER.180517T0909Z.180517T1300Z.180517T2122Z.NO/
710 AM EDT Thu May 17 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  6:47 AM Thursday the stage was 8.6 feet.
* Flood stage is 7.0 feet.
* Minor flooding is occurring and Moderate flooding is forecast.
* Forecast...The river will continue rising to near 9.4 feet by late this 
  morning. The river will fall below flood stage late 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 9.4 feet on Dec 11 
  2003.  

 
&&

                         FLD    OBSERVED           FORECAST
 LOCATION                STG    STG  DAY TIME      CREST

Brandywine Creek
  Downingtown            7.0    8.61  Thu 7 AM     9.4    Thu 9 AM 
 
&&
 
LAT...LON 4002 7567 3993 7561 3991 7567 4001 7574
                                      

$$

CMS

517 
WGUS81 KPHI 171655
FLSPHI
Flood Statement
National Weather Service Mt Holly NJ
1255 PM EDT Thu May 17 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.

&&

PAC029-171725-
/O.CAN.KPHI.FL.W.0014.000000T0000Z-180518T0322Z/
/DWNP1.2.ER.180517T0909Z.180517T1215Z.180517T1426Z.NO/
1255 PM EDT Thu May 17 2018

The Flood Warning is cancelled for
  The East Branch Brandywine Creek at Downingtown.
* At 12:45 PM Thursday the stage was 5.2 feet.
* Flood stage is 7.0 feet.
* Fell below flood stage this morning.
 
&&

                         FLD    OBSERVED           FORECAST
 LOCATION                STG    STG   DAY TIME     CREST

Brandywine Creek
  Downingtown            7.0    5.25  Thu 1 PM     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
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, 6:29 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
May 17, 10:04 AM EDT	River Flood Warning	PHI	Chester, Delaware	8 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.