Alert archive / Pennsylvania / River Flood Warnings in 2011

River Flood Warning 61, NWS Philadelphia/Mount Holly

April 16, 2011Chester County, Pennsylvania

NWS Philadelphia/Mount Holly issued this river flood warning at Apr 16, 2011, 9:18 PM EDT for Chester County, Pennsylvania. It was in force for 11 hr.

The area

The counties it named.

The facts

Issued: Apr 16, 2011, 9:18 PM EDT (01:18 UTC)
Expired: Apr 17, 2011, 8:23 AM EDT
In force: 11 hr
Issued by: NWS Philadelphia/Mount Holly
Flood severity: Minor

County Chester County, PA

The radar

The Philadelphia radar (KDIX), 114 km from the middle of the area, began a volume at 01:18 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 9.48 ft at Apr 17, 2011, 12:00 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, in the capitals the NWS used until 2016.

013 
WGUS41 KPHI 170118
FLWPHI
BULLETIN - IMMEDIATE BROADCAST REQUESTED
FLOOD WARNING
NATIONAL WEATHER SERVICE MT HOLLY, NEW JERSEY
918 PM EDT SAT APR 16 2011

...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.

&&

PAC029-170718-
/O.NEW.KPHI.FL.W.0061.110417T0118Z-110417T1641Z/
/DWNP1.1.ER.110417T0053Z.110417T0400Z.110417T1041Z.NO/
918 PM EDT SAT APR 16 2011

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A 

* FLOOD WARNING FOR 
  THE EAST BRANCH BRANDYWINE CREEK BELOW DOWNINGTOWN.
* UNTIL SUNDAY AFTERNOON...OR UNTIL THE WARNING IS CANCELLED.
* AT  9:00 PM SATURDAY THE STAGE WAS 7.2 FEET. 
* FLOOD STAGE IS 7.0 FEET.
* MINOR FLOODING IS OCCURRING AND MINOR FLOODING IS FORECAST.
* FORECAST...THE RIVER WILL CONTINUE RISING TO NEAR 8.8 FEET BY AFTER 
  MIDNIGHT TOMORROW. THE RIVER WILL FALL BELOW FLOOD STAGE TOMORROW 
  MORNING.


$$

                   FLD      OBSERVED          FORECAST
 LOCATION          STG    STG  DAY TIME       CREST

BRANDYWINE CREEK
  DOWNINGTOWN      7.0    7.17  SAT 9 PM     8.8  SUN 12 AM

&&

2 follow-up statements

260 
WGUS41 KPHI 170357
FLWPHI
BULLETIN - IMMEDIATE BROADCAST REQUESTED
FLOOD WARNING
NATIONAL WEATHER SERVICE MT HOLLY, NEW JERSEY
1157 PM EDT SAT APR 16 2011

...OBSERVED 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.

&&

PAC029-170957-
/O.CON.KPHI.FL.W.0061.000000T0000Z-110417T1641Z/
/DWNP1.2.ER.110417T0053Z.110417T0316Z.110417T1041Z.NO/
1157 PM EDT SAT APR 16 2011

...OBSERVED FLOODING INCREASED FROM MINOR TO MODERATE SEVERITY...
THE FLOOD WARNING CONTINUES FOR 
  THE EAST BRANCH BRANDYWINE CREEK BELOW DOWNINGTOWN.
* UNTIL SUNDAY AFTERNOON...OR UNTIL THE WARNING IS CANCELLED.
* AT 11:16 PM SATURDAY THE STAGE WAS 9.2 FEET. 
* FLOOD STAGE IS 7.0 FEET. 
* MODERATE FLOODING IS OCCURRING AND MODERATE FLOODING IS FORECAST.
* FORECAST...THE RIVER WILL CREST OVERNIGHT AND THEN FALL TO BELOW FLOOD STAGE BY 
  TOMORROW MORNING.


$$

                   FLD      OBSERVED          FORECAST
 LOCATION          STG    STG  DAY TIME       CREST

BRANDYWINE CREEK
  DOWNINGTOWN      7.0    9.22  SAT 11 PM    10.0  SUN 3 AM

&&

550 
WGUS81 KPHI 171223
FLSPHI
FLOOD STATEMENT 
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
823 AM EDT SUN APR 17 2011

...THE FLOOD WARNING IS CANCELLED FOR THE EAST BRANCH BRANDYWINE
CREEK BELOW DOWNINGTOWN...

...THE FLOOD WARNING CONTINUES FOR THE BRANDYWINE CREEK AT CHADDS
FORD...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SAFETY MESSAGE...DO NOT ATTEMPT TO DRIVE THROUGH FLOODED AREAS. THE 
WATER MAY BE DEEPER THAN YOU THINK IT IS.

&&

PAC029-171253-
/O.CAN.KPHI.FL.W.0061.000000T0000Z-110417T1641Z/
/DWNP1.2.ER.110417T0053Z.110417T0330Z.110417T0803Z.NO/
823 AM EDT SUN APR 17 2011

THE FLOOD WARNING IS CANCELLED FOR
  THE EAST BRANCH BRANDYWINE CREEK BELOW DOWNINGTOWN.
* AT 8:00 AM SUNDAY, THE SPECIFIC STAGE WAS UNAVAIABLE BUT IT 
  WAS BELOW FLOOD STAGE. 
* FLOOD STAGE IS 7.0 FEET. 

$$

PAC029-045-172049-
/O.EXT.KPHI.FL.W.0080.000000T0000Z-110417T2049Z/
/CDFP1.1.ER.110417T0838Z.110417T1030Z.110417T1449Z.NO/
823 AM EDT SUN APR 17 2011

THE FLOOD WARNING CONTINUES FOR
  THE BRANDYWINE CREEK AT CHADDS FORD.
* AT 8:00 AM SUNDAY, THE STAGE WAS 9.58 FEET AND FALLING. 
* FLOOD STAGE IS 9.0 FEET. 
* MINOR FLOODING IS OCCURRING.
* FORECAST...THE RIVER LEVEL WILL CONTINUE FALLING AND IT SHOULD BE 
  BACK BELOW FLOOD STAGE BY THIS AFTERNOON.

$$

                   FLD      OBSERVED          FORECAST
 LOCATION          STG    STG  DAY TIME       CREST

BRANDYWINE CREEK
  DOWNINGTOWN      7.0    MSG   SUN 800 AM    CRESTED
  CHADDS FORD      9.0    9.58  SUN 800 AM    CRESTED 

&&

IOVINO

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 16, 8:08 PM EDT	Areal Flood Warning	PHI	Bucks, Delaware, Montgomery, Philadelphia	8 hr
Apr 16, 9:11 PM EDT	Severe Thunderstorm Warning	PHI	Chester	64 min
Apr 16, 9:32 PM EDT	River Flood Warning	PHI	Delaware	6 hr
Apr 16, 9:49 PM EDT	Special Weather Statement	PHI	Berks, Lehigh	56 min
Apr 16, 11:09 PM EDT	River Flood Warning	PHI	Bucks	13 hr
Apr 16, 11:11 PM EDT	River Flood Warning	PHI	Montgomery	6 hr
Apr 17, 1:05 AM EDT	Areal Flood Warning	PHI	Berks	5 hr
Apr 17, 3:56 AM EDT	Areal Flood Warning	PHI	Bucks, Chester, Delaware, Montgomery, Philadelphia	6 hr
Apr 17, 6:07 AM EDT	Areal Flood Warning	PHI	Chester	3 hr
Apr 17, 6:37 AM EDT	River Flood Warning	PHI	Chester, Delaware	7 hr
Apr 17, 9:51 AM EDT	Coastal Flood Warning	PHI	Delaware, Philadelphia	4 hr

Nearby

River Flood Warnings in Pennsylvania, 2011 Every river flood warning in 2011

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.