Alert archive / Pennsylvania / River Flood Warnings in 2011

River Flood Warning 198, NWS Philadelphia/Mount Holly

September 24, 2011Chester County, Montgomery County, Philadelphia County, Pennsylvania

NWS Philadelphia/Mount Holly issued this river flood warning at Sep 24, 2011, 4:13 AM EDT for Chester County, Montgomery County, Philadelphia County, Pennsylvania. It took effect at Sep 24, 2011, 5:00 AM EDT. It was in force for 6 hr.

The area

The counties it named.

The facts

Issued: Sep 24, 2011, 4:13 AM EDT (08:13 UTC)
In effect from: Sep 24, 2011, 5:00 AM EDT
Expired: Sep 24, 2011, 11:16 AM EDT
In force: 6 hr
Issued by: NWS Philadelphia/Mount Holly
Flood severity: Minor

Counties Chester County, PA, Montgomery County, PA, Philadelphia County, PA

The radar

The Philadelphia radar (KDIX), 87 km from the middle of the area, began a volume at 08:16 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 Schuylkill River at Norristown (NRSP1). The gauge peaked at 13.22 ft at Sep 24, 2011, 7:00 AM EDT.

Action stage: 12 ft
Minor stage: 13 ft
Moderate stage: 17 ft
Major stage: 19 ft

This gauge today: stage, forecast and historic crests

Stage from the USGS instantaneous record for site 01473500, 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.

409 
WGUS41 KPHI 240813
FLWPHI
BULLETIN - IMMEDIATE BROADCAST REQUESTED
FLOOD WARNING
NATIONAL WEATHER SERVICE MT HOLLY, NEW JERSEY
413 AM EDT SAT SEP 24 2011

...THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A FLOOD 
WARNING FOR THE FOLLOWING RIVERS IN PENNSYLVANIA... 

  SCHUYLKILL RIVER AT NORRISTOWN AFFECTING CHESTER...MONTGOMERY AND 
  PHILADELPHIA COUNTIES

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

PAC029-091-101-241413-
/O.NEW.KPHI.FL.W.0198.110924T0900Z-110924T1700Z/
/NRSP1.1.ER.110924T0900Z.110924T1000Z.110924T1100Z.NO/
413 AM EDT SAT SEP 24 2011

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A 

* FLOOD WARNING FOR 
  THE SCHUYLKILL RIVER AT NORRISTOWN.
* UNTIL THIS AFTERNOON...OR UNTIL THE WARNING IS CANCELLED.
* AT  3:30 AM SATURDAY THE STAGE WAS 12.8 FEET. 
* FLOOD STAGE IS 13.0 FEET. 
* MINOR FLOODING IS FORECAST. 
* FORECAST...RISE ABOVE FLOOD STAGE BY EARLY THIS MORNING AND CONTINUE 
  TO RISE TO NEAR 13.3 FEET THIS MORNING. THE RIVER WILL FALL BELOW 
  FLOOD STAGE BY LATE THIS MORNING.
* IMPACT...AT 12.5 FEET...FLOODING OCCURS IN WEST NORRITON. THE WEST 
  INDIAN LANE BRIDGE BEGINS TO FLOOD.

$$

                   FLD      OBSERVED          FORECAST
 LOCATION          STG    STG  DAY TIME       CREST

SCHUYLKILL RIVER
  NORRISTOWN       13.0   12.77  SAT 3 AM    13.3  SAT 6 AM 

&&

3 follow-up statements

865 
WGUS81 KPHI 241011
FLSPHI
FLOOD STATEMENT 
NATIONAL WEATHER SERVICE MT HOLLY, NEW JERSEY
611 AM EDT SAT SEP 24 2011

...THE FLOOD WARNING CONTINUES FOR THE FOLLOWING RIVER IN 
PENNSYLVANIA...
 
  SCHUYLKILL RIVER AT NORRISTOWN AFFECTING CHESTER...MONTGOMERY AND 
  PHILADELPHIA COUNTIES 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

PAC029-091-101-242010-
/O.EXT.KPHI.FL.W.0198.000000T0000Z-110924T2010Z/
/NRSP1.1.ER.110924T0812Z.110924T1200Z.110924T1410Z.NO/
611 AM EDT SAT SEP 24 2011

THE FLOOD WARNING CONTINUES FOR
  THE SCHUYLKILL RIVER AT NORRISTOWN.
* AT  5:30 AM SATURDAY THE STAGE WAS 13.2 FEET. 
* FLOOD STAGE IS 13.0 FEET. 
* MINOR FLOODING IS OCCURRING AND MINOR FLOODING IS FORECAST.
* FORECAST...THE RIVER WILL CONTINUE RISING TO NEAR 13.4 FEET BY THIS 
  MORNING. THE RIVER WILL FALL BELOW FLOOD STAGE LATE THIS MORNING.
* IMPACT...AT 13.0 FEET...WATER BEGINS TO COVER AND CLOSE RIVERVIEW 
  BOULEVARD IN WEST NORRITON.

$$

                   FLD      OBSERVED          FORECAST
 LOCATION          STG    STG   DAY TIME       CREST

SCHUYLKILL RIVER
  NORRISTOWN      13.0   13.18  SAT 5 AM    13.4  SAT 8 AM 

&&

459 
WGUS81 KPHI 241420
FLSPHI
FLOOD STATEMENT 
NATIONAL WEATHER SERVICE MT HOLLY, NEW JERSEY
1020 AM EDT SAT SEP 24 2011

...THE FLOOD WARNING CONTINUES FOR THE FOLLOWING RIVERS IN 
PENNSYLVANIA...
 
  SCHUYLKILL RIVER AT NORRISTOWN AFFECTING CHESTER...MONTGOMERY AND 
  PHILADELPHIA COUNTIES 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

PAC029-091-101-250000-
/O.EXT.KPHI.FL.W.0198.000000T0000Z-110925T0000Z/
/NRSP1.1.ER.110924T0812Z.110924T1045Z.110924T1800Z.NO/
1020 AM EDT SAT SEP 24 2011

THE FLOOD WARNING CONTINUES FOR
  THE SCHUYLKILL RIVER AT NORRISTOWN.
* AT  10:00 AM SATURDAY THE STAGE WAS 13.0 FEET. 
* FLOOD STAGE IS 13.0 FEET. 
* FORECAST...MINOR FLOODING IS OCCURRING. THE RIVER WILL
  CONTINUE TO FALL TO BELOW FLOOD STAGE BY THIS AFTERNOON.
* IMPACT...AT 13.0 FEET...WATER BEGINS TO COVER AND CLOSE RIVERVIEW 
  BOULEVARD IN WEST NORRITON.

$$

                   FLD      OBSERVED          FORECAST
 LOCATION          STG    STG  DAY TIME       CREST

SCHUYLKILL RIVER
  NORRISTOWN       13.0   13.00  SAT 10 AM    CRESTED 

&&

910 
WGUS81 KPHI 241516
FLSPHI
FLOOD STATEMENT 
NATIONAL WEATHER SERVICE MT HOLLY, NEW JERSEY
1116 AM EDT SAT SEP 24 2011

...THE FLOOD WARNING IS CANCELLED FOR THE FOLLOWING RIVERS IN 
PENNSYLVANIA...
 
  SCHUYLKILL RIVER AT NORRISTOWN AFFECTING CHESTER...MONTGOMERY AND 
  PHILADELPHIA COUNTIES

PAC029-091-101-241546-
/O.CAN.KPHI.FL.W.0198.000000T0000Z-110925T0000Z/
/NRSP1.1.ER.110924T0812Z.110924T1045Z.110924T1409Z.NO/
1116 AM EDT SAT SEP 24 2011

THE FLOOD WARNING IS CANCELLED FOR
  THE SCHUYLKILL RIVER AT NORRISTOWN.
* AT 10AM SATURDAY THE STAGE WAS 12.9 FEET.  
* FLOOD STAGE IS 13.0 FEET.
* IMPACT...AT 13.0 FEET...WATER BEGINS TO COVER AND CLOSE RIVERVIEW 
  BOULEVARD IN WEST NORRITON.

$$

                   FLD      OBSERVED          FORECAST
 LOCATION          STG    STG  DAY TIME       CREST

SCHUYLKILL RIVER
  NORRISTOWN       13.0   12.94  SAT 10 AM   CRESTED AND FALLING 

&&

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 23, 8:29 PM EDT	Special Weather Statement	PHI	Montgomery	31 min
Sep 23, 10:31 PM EDT	Areal Flood Warning	PHI	Bucks	6 hr
Sep 23, 11:48 PM EDT	Areal Flood Warning	PHI	Philadelphia	5 hr
Sep 23, 11:58 PM EDT	River Flood Warning	PHI	Chester	5 hr
Sep 24, 1:04 AM EDT	River Flood Warning	PHI	Bucks	5 hr
Sep 24, 4:44 AM EDT	River Flood Warning	PHI	Chester, Delaware	14 hr
Sep 24, 5:29 AM EDT	Areal Flood Warning	PHI	Chester, Montgomery	5 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.