Alert archive / Pennsylvania / River Flood Warnings in 2011

River Flood Warning 221, NWS Philadelphia/Mount Holly

December 8, 2011Chester County, Montgomery County, Philadelphia County, Pennsylvania

NWS Philadelphia/Mount Holly issued this river flood warning at Dec 8, 2011, 2:21 AM EST for Chester County, Montgomery County, Philadelphia County, Pennsylvania. It took effect at Dec 8, 2011, 3:59 AM EST. It was in force for 8 hr.

The area

The counties it named.

The facts

Issued: Dec 8, 2011, 2:21 AM EST (07:21 UTC)
In effect from: Dec 8, 2011, 3:59 AM EST
Expired: Dec 8, 2011, 12:15 PM EST
In force: 8 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 07:21 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 13.52 ft at Dec 8, 2011, 5:00 AM EST.

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.

994 
WGUS41 KPHI 080721
FLWPHI
BULLETIN - IMMEDIATE BROADCAST REQUESTED
FLOOD WARNING
NATIONAL WEATHER SERVICE MT HOLLY, NEW JERSEY
221 AM EST THU DEC 8 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.

&&

PAC029-091-101-081321-
/O.NEW.KPHI.FL.W.0221.111208T1200Z-111209T0000Z/
/NRSP1.1.ER.111208T1200Z.111208T1200Z.111208T1800Z.NO/
221 AM EST THU DEC 8 2011

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A 

* FLOOD WARNING FOR 
  THE SCHUYLKILL RIVER AT NORRISTOWN.
* FROM THIS MORNING TO THIS EVENING...OR UNTIL THE WARNING IS CANCELLED.
* AT 1:30 AM THURSDAY THE STAGE WAS 12.9 FEET. 
* FLOOD STAGE IS 13.0 FEET. 
* MINOR FLOODING IS FORECAST. 
* FORECAST...THE RIVER IS EXPECTED TO RISE TO NEAR FLOOD STAGE 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   12.91  THU 1 AM    13.0    THU 7 AM 

&&

2 follow-up statements

436 
WGUS81 KPHI 080901
FLSPHI
FLOOD STATEMENT 
NATIONAL WEATHER SERVICE MT HOLLY, NEW JERSEY
401 AM EST THU DEC 8 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.

&&

PAC029-091-101-081901-
/O.EXT.KPHI.FL.W.0221.111208T0859Z-111209T0200Z/
/NRSP1.1.ER.111208T0636Z.111208T1200Z.111208T2000Z.NO/
401 AM EST THU DEC 8 2011

THE FLOOD WARNING CONTINUES FOR
  THE SCHUYLKILL RIVER AT NORRISTOWN.
* FROM EARLY THIS MORNING TO THIS EVENING...OR UNTIL THE WARNING IS 
  CANCELLED.
* AT 3:30 AM THURSDAY THE STAGE WAS 13.4 FEET. 
* FLOOD STAGE IS 13.0 FEET. 
* MINOR FLOODING IS OCCURRING AND MINOR FLOODING IS FORECAST.
* FORECAST...THE RIVER WILL CONTINUE RISING TO NEAR 14.7 FEET THIS 
  MORNING. THE RIVER WILL FALL BELOW FLOOD STAGE LATE THIS AFTERNOON.
* IMPACT...AT 15.0 FEET...RIVER ROAD IN WEST CONSHOHOCKEN BEGINS TO 
  FLOOD. THE LOWER GARAGES AT THE RIVERVIEW LANDING AND THE LOFTS AT 
  VALLEY FORGE START TO TAKE ON WATER. THE LOWER SECTION OF PORT INDIAN 
  ROAD IN WEST NORRITON BECOMES IMPASSABLE.

$$

                   FLD     OBSERVED           FORECAST
 LOCATION          STG    STG  DAY TIME       CREST

SCHUYLKILL RIVER
  NORRISTOWN       13.0   13.45  THU 3 AM    14.7    THU 7 AM 

&&

137 
WGUS81 KPHI 081715
FLSPHI
FLOOD STATEMENT 
NATIONAL WEATHER SERVICE MT HOLLY, NEW JERSEY
1215 PM EST THU DEC 8 2011

...THE FLOOD WARNING IS CANCELLED 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.

&&

PAC029-091-101-081745-
/O.CAN.KPHI.FL.W.0221.000000T0000Z-111209T0200Z/
/NRSP1.1.ER.111208T0636Z.111208T1030Z.111208T1501Z.NO/
1215 PM EST THU DEC 8 2011

THE FLOOD WARNING IS CANCELLED FOR
  THE SCHUYLKILL RIVER AT NORRISTOWN.
* AT 11:30 AM THURSDAY THE STAGE WAS 12.8 FEET. 
* FLOOD STAGE IS 13.0 FEET. 
* FELL BELOW FLOOD STAGE AT 10:01 AM THURSDAY.
* FORECAST...THE RIVER WILL CONTINUE TO FALL TO 11.1 FEET BY TOMORROW 
  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   12.80  THU 11 AM   BELOW FLOOD STAGE. 

&&

The office that day

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

Issued	Product	Office	Counties	Lasted
Dec 7, 8:04 PM EST	Areal Flood Warning	PHI	Bucks, Chester, Delaware, Montgomery, Philadelphia	18 hr
Dec 7, 9:41 PM EST	River Flood Warning	PHI	Delaware	5 hr
Dec 7, 10:12 PM EST	River Flood Warning	PHI	Bucks	12 hr
Dec 7, 11:40 PM EST	River Flood Warning	PHI	Chester	8 hr
Dec 8, 1:58 AM EST	Areal Flood Warning	PHI	Berks, Carbon, Lehigh, Monroe, Northampton	5 hr
Dec 8, 2:51 AM EST	River Flood Warning	PHI	Chester, Delaware	13 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.