Alert archive / Pennsylvania / River Flood Warnings in 2018

River Flood Warning 71, NWS Philadelphia/Mount Holly

November 25, 2018Chester County, Montgomery County, Philadelphia County, Pennsylvania

NWS Philadelphia/Mount Holly issued this river flood warning at Nov 25, 2018, 2:54 AM EST for Chester County, Montgomery County, Philadelphia County, Pennsylvania. It took effect at Nov 25, 2018, 4:00 AM EST. It was in force for 20 hr.

The area

The outline as issued.

The facts

Issued: Nov 25, 2018, 2:54 AM EST (07:54 UTC)
In effect from: Nov 25, 2018, 4:00 AM EST
Expired: Nov 26, 2018, 12:20 AM EST
In force: 20 hr
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Flood severity: Minor

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

The radar

The Philadelphia radar (KDIX), 78 km from the middle of the area, began a volume at 07:55 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 13.69 ft at Nov 25, 2018, 6:00 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.

306 
WGUS41 KPHI 250754
FLWPHI
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Flood Warning
National Weather Service Mount Holly NJ
254 AM EST Sun Nov 25 2018

...The National Weather Service in Mount Holly NJ has issued a
Flood Warning for the Schuylkill River from Norristown to
Philadelphia...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

PAC029-091-101-251355-
/O.NEW.KPHI.FL.W.0071.181125T0900Z-181126T0520Z/
/NRSP1.1.ER.181125T0900Z.181125T1800Z.181125T2320Z.NO/
254 AM EST Sun Nov 25 2018

The National Weather Service in Mount Holly NJ has issued a 

* Flood Warning for 
  The Schuylkill River at Norristown.
* until late tonight or until the warning is cancelled.
* At 2:30 AM the river level was 12.76 feet.
* Flood stage is 13.0 feet.
* Minor flooding is forecast.
* Forecast...The river is expected to rise above flood stage early
  this morning and continue rising to near 14.6 feet this afternoon.
  The river should fall back below flood stage this evening.
* 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
  Indain Road in West Norriton becomes impassable.
* Flood history...This crest compares to a previous crest of 14.4
  feet on March 11, 2011.  
 
&&

                         FLD    OBSERVED           FORECAST
 LOCATION                STG    STG  DAY TIME      CREST

Schuylkill River
  Norristown            13.0   12.76  Sun 230 AM   14.6  Sun 1 PM 
 
&&
 
LAT...LON 4006 7542 4013 7535 4002 7517 3998 7525
                                      
$$

PAC091-101-251355-
/O.NEW.KPHI.FL.W.0072.181125T1600Z-181126T0100Z/
/PADP1.1.ER.181125T1600Z.181125T1800Z.181125T1900Z.NO/
254 AM EST Sun Nov 25 2018

The National Weather Service in Mount Holly NJ has issued a 

* Flood Warning for 
  The Schuylkill River at Philadelphia.
* from this morning until this evening.
* At 2:00 AM the river level was 8.6 feet.
* Flood stage is 11.0 feet.
* Minor flooding is forecast.
* Forecast...The river is expected to rise above flood stage late
  this morning and continue rising to near 11.1 feet this afternoon.
  The river should fall back below flood stage late this afternoon.
* Impact...At 11.0 feet, Kelly Drive is flooded and closed between
  Hunting Park Avenue and Falls Bridge. The Flat Rock area is flooded.
* Flood history...This crest compares to a previous crest of 11.0
  feet on March 11, 2011.  
 
&&

                         FLD    OBSERVED           FORECAST
 LOCATION                STG    STG  DAY TIME      CREST

Schuylkill River
  Philadelphia          11.0   8.60  Sun 2 AM     11.1  Sun 1 PM 
 
&&
 
LAT...LON 3998 7525 4002 7517 3988 7517 3985 7525
                                      
$$

Iovino

2 follow-up statements

197 
WGUS81 KPHI 251443
FLSPHI
Flood Statement
National Weather Service Mt Holly NJ
943 AM EST Sun Nov 25 2018

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

  Schuylkill River At Norristown affecting Chester...Montgomery 
  and Philadelphia Counties
  
  Schuylkill River At Philadelphia affecting 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.

&&

PAC029-091-101-260043-
/O.EXT.KPHI.FL.W.0071.000000T0000Z-181126T0243Z/
/NRSP1.1.ER.181125T0756Z.181125T1100Z.181125T2043Z.NO/
943 AM EST Sun Nov 25 2018

The Flood Warning continues for
  The Schuylkill River at Norristown.
* At 8:30 AM Sunday the stage was 13.5 feet.
* Flood stage is 13.0 feet.
* Minor flooding is occurring.
* Forecast...The river will fall below flood stage 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.
* Flood history...This crest compares to a previous crest of 15.1 feet
  on Aug 14 2018.  
 
&&

                         FLD    OBSERVED           FORECAST
 LOCATION                STG    STG  DAY TIME      CREST

Schuylkill River
  Norristown             13.0   13.52  Sun 8 AM    Crested  
 
&&
 
LAT...LON 4006 7542 4013 7535 4002 7517 3998 7525
                                      

$$

PAC091-101-260030-
/O.EXT.KPHI.FL.W.0072.181125T1600Z-181126T0030Z/
/PADP1.1.ER.181125T1600Z.181125T1800Z.181125T1830Z.NO/
943 AM EST Sun Nov 25 2018

The Flood Warning continues for
  The Schuylkill River at Philadelphia.
* until this evening...or until the warning is cancelled.
* At 9:00 AM Sunday the stage was 10.4 feet.
* Flood stage is 11.0 feet.
* Minor flooding is forecast.
* Impact...At 11.5 feet...Route 1 off ramp to Ridge Avenue is
  flooded and closed. MLK Drive is flooded and closed between 
  Greenland Drive and Montgomery Drive.
* Flood history...This crest compares to a previous crest of 11.4 
  feet on Jun 21 2003.  
 
&&

                         FLD    OBSERVED           FORECAST
 LOCATION                STG    STG    DAY TIME    CREST

Schuylkill River
  Philadelphia           11.0   10.37  Sun 9 AM    11.1    Sun 1 PM 
 
&&
 
LAT...LON 3998 7525 4002 7517 3988 7517 3985 7525
                                      

$$

Kruzdlo

934 
WGUS81 KPHI 251844
FLSPHI
Flood Statement
National Weather Service Mt Holly NJ
144 PM EST Sun Nov 25 2018

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

  Schuylkill River At Norristown affecting Chester...Montgomery 
  and Philadelphia Counties
  
  Schuylkill River At Philadelphia affecting 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.

&&

PAC029-091-101-251914-
/O.CAN.KPHI.FL.W.0071.000000T0000Z-181126T0243Z/
/NRSP1.1.ER.181125T0756Z.181125T1100Z.181125T1708Z.NO/
144 PM EST Sun Nov 25 2018

The Flood Warning is cancelled for
  The Schuylkill River at Norristown.
* At 12:30 PM Sunday the stage was 12.9 feet.
* Flood stage is 13.0 feet.
* Fell below flood stage at 12:08 PM Sunday.
* Forecast...The river will continue to fall to 11.3 feet by 
  tomorrow morning.
* Impact...At 13.0 feet...Water begins to cover and close 
  Riverview Boulevard in West Norriton.
* Flood history...This crest compares to a previous crest of 
  13.4 feet on Sep 28 2018.  
 
&&

                         FLD    OBSERVED           FORECAST
 LOCATION                STG    STG    DAY TIME    CREST
 
Schuylkill River
  Norristown             13.0   12.92  Sun 12 PM   Crested and falling 
 
&&
 
LAT...LON 4006 7542 4013 7535 4002 7517 3998 7525
                                      

$$

PAC091-101-251914-
/O.CAN.KPHI.FL.W.0072.000000T0000Z-181126T0030Z/
/PADP1.N.ER.000000T0000Z.000000T0000Z.000000T0000Z.NO/
144 PM EST Sun Nov 25 2018

The Flood Warning is cancelled for
  The Schuylkill River at Philadelphia.
* At 1:00 PM Sunday the stage was 9.9 feet.
* Flood stage is 11.0 feet.
* Forecast...The river crested below flood stage at 10.4 feet. 
* Flood history...This crest compares to a previous crest of 10.6
  feet on Mar 14 2010.  
 
&&

                         FLD    OBSERVED           FORECAST
 LOCATION                STG    STG    DAY TIME    CREST

Schuylkill River
  Philadelphia           11.0    9.87  Sun 1 PM    Crested and falling 
 
&&
 
LAT...LON 3998 7525 4002 7517 3988 7517 3985 7525
                                      

$$

Kruzdlo

The office that day

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

Issued	Product	Office	Counties	Lasted
Nov 24, 9:57 PM EST	River Flood Warning	PHI	Chester	8 hr
Nov 24, 10:15 PM EST	Areal Flood Warning	PHI	Chester, Delaware	6 hr
Nov 24, 10:34 PM EST	River Flood Warning	PHI	Delaware	5 hr
Nov 24, 11:33 PM EST	Areal Flood Warning	PHI	Montgomery, Philadelphia	12 hr
Nov 24, 11:36 PM EST	Areal Flood Warning	PHI	Chester	6 hr
Nov 25, 12:05 AM EST	Areal Flood Warning	PHI	Bucks	12 hr
Nov 25, 12:13 AM EST	River Flood Warning	PHI	Montgomery	10 hr
Nov 25, 12:16 AM EST	River Flood Warning	PHI	Chester, Delaware	15 hr
Nov 25, 1:47 AM EST	River Flood Warning	PHI	Bucks	12 hr
Nov 25, 2:54 AM EST	River Flood Warning	PHI	Montgomery, Philadelphia	17 hr
Nov 25, 3:25 PM EST	Coastal Flood Advisory	PHI	Bucks, Delaware, Philadelphia	34 hr
Nov 25, 3:35 PM EST	Flood Watch	PHI	Bucks, Chester, Delaware, Montgomery, Philadelphia	27 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.