Alert archive / Pennsylvania / River Flood Warnings in 2018

River Flood Warning 53, NWS Philadelphia/Mount Holly

November 3, 2018Montgomery County, Pennsylvania

NWS Philadelphia/Mount Holly issued this river flood warning at Nov 3, 2018, 2:40 AM EDT for Montgomery County, Pennsylvania. It took effect at Nov 3, 2018, 3:00 AM EDT. It was in force for 10 hr.

The area

The outline as issued.

The facts

Issued: Nov 3, 2018, 2:40 AM EDT (06:40 UTC)
In effect from: Nov 3, 2018, 3:00 AM EDT
Expired: Nov 3, 2018, 1:01 PM EDT
In force: 10 hr
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Flood severity: Minor

County Montgomery County, PA

The radar

The Philadelphia radar (KDIX), 93 km from the middle of the area, began a volume at 06:40 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 Perkiomen Creek at Graterford (GRAP1). The gauge peaked at 13.33 ft at Nov 3, 2018, 8:00 AM EDT.

Action stage: 8 ft
Minor stage: 11 ft
Moderate stage: 13 ft
Major stage: 16 ft

This gauge today: stage, forecast and historic crests

Stage from the USGS instantaneous record for site 01473000, 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.

188 
WGUS41 KPHI 030640
FLWPHI
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Flood Warning
National Weather Service Mt Holly NJ
240 AM EDT Sat Nov 3 2018

...The National Weather Service in Mount Holly NJ has issued a flood warning for
the following rivers in Pennsylvania...

  Perkiomen Creek At Graterford affecting Montgomery County
  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.

&&

PAC091-031239-
/O.NEW.KPHI.FL.W.0053.181103T0700Z-181103T2010Z/
/GRAP1.1.ER.181103T0700Z.181103T1200Z.181103T1410Z.NO/
240 AM EDT Sat Nov 3 2018

The National Weather Service in Mount Holly NJ has issued a 

* Flood Warning for 
  The Perkiomen Creek at Graterford.
* Until this afternoon...Or until the warning is cancelled.
* At 2:31 AM Saturday the stage was 10.2 feet.
* Flood stage is 11.0 feet.
* Minor flooding is forecast.
* Forecast...Rise above flood stage by early this morning and continue to rise 
  to near 12.6 feet by this morning. The river will fall below flood stage by 
  late this morning.
* Impact...At 13.0 feet...The sewage treatment plant in Schwenksville is 
  flooded.
* Flood history...This crest compares to a previous crest of 12.5 feet on Jul 28 
  2004.  

 
&&

                         FLD    OBSERVED           FORECAST
 LOCATION                STG    STG  DAY TIME      CREST

Perkiomen Creek
  Graterford             11.0   10.24  Sat 3 AM    12.6    Sat 8 AM 
 
&&
 
LAT...LON 4024 7549 4024 7542 4011 7542 4012 7547
                                      

$$

PAC029-091-101-031239-
/O.NEW.KPHI.FL.W.0054.181103T1400Z-181104T0600Z/
/NRSP1.1.ER.181103T1400Z.181103T1800Z.181104T0000Z.NO/
240 AM EDT Sat Nov 3 2018

The National Weather Service in Mount Holly NJ has issued a 

* Flood Warning for 
  The Schuylkill River at Norristown.
* From this morning to late tonight...Or until the warning is cancelled.
* At 1:30 AM Saturday the stage was 9.0 feet.
* Flood stage is 13.0 feet.
* Minor flooding is forecast.
* Forecast...Rise above flood stage by late this morning and continue to rise to
  near 14.0 feet by this afternoon. The river will fall below flood stage by 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 13.7 feet on Aug 4 
  2018.  

 
&&

                         FLD    OBSERVED           FORECAST
 LOCATION                STG    STG  DAY TIME      CREST

Schuylkill River
  Norristown             13.0    9.03  Sat 1 AM    14.0    Sat 2 PM 
 
&&
 
LAT...LON 4006 7542 4013 7535 4002 7517 3998 7525
                                      

$$

Robertson

3 follow-up statements

557 
WGUS41 KPHI 031046
FLWPHI
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Flood Warning
National Weather Service Mt Holly NJ
646 AM EDT Sat Nov 3 2018

...Forecast flooding changed from Minor to Moderate severity for the following 
rivers in Pennsylvania...
  Perkiomen Creek At Graterford affecting Montgomery County

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

PAC091-031646-
/O.EXT.KPHI.FL.W.0053.000000T0000Z-181103T2300Z/
/GRAP1.2.ER.181103T0721Z.181103T1400Z.181103T1700Z.NO/
646 AM EDT Sat Nov 3 2018

...Forecast flooding increased from Minor to Moderate severity...
The Flood Warning continues for 
 The Perkiomen Creek At Graterford.
* until this evening...Or until the warning is cancelled.
* At 6:17 AM Saturday the stage was 13.0 feet.
* Flood stage is 11.0 feet.
* Minor flooding is occurring and Moderate flooding is forecast.
* Forecast...The river will continue rising to near 13.5 feet by late this 
  morning. The river will fall below flood stage this afternoon.
* Impact...At 13.5 feet...Houses on the left bank in Graterford are flooded.
* Flood history...This crest compares to a previous crest of 13.7 feet on Jun 28 
  2006.  

 
&&

                         FLD    OBSERVED           FORECAST
 LOCATION                STG    STG  DAY TIME      CREST

Perkiomen Creek
  Graterford             11.0   12.96  Sat 6 AM    13.5    Sat 10 AM
 
&&
 
LAT...LON 4024 7549 4024 7542 4011 7542 4012 7547
                                      

$$

Robertson

944 
WGUS81 KPHI 031418
FLSPHI
Flood Statement
National Weather Service Mt Holly NJ
1018 AM EDT Sat Nov 3 2018

...The Flood Warning continues for the following rivers in Pennsylvania...
  Perkiomen Creek At Graterford affecting Montgomery County

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

PAC091-032300-
/O.CON.KPHI.FL.W.0053.000000T0000Z-181103T2300Z/
/GRAP1.2.ER.181103T0721Z.181103T1216Z.181103T1700Z.NO/
1018 AM EDT Sat Nov 3 2018

The Flood Warning continues for
  The Perkiomen Creek at Graterford.
* At 10:02 AM Saturday the stage was 12.7 feet.
* Flood stage is 11.0 feet. Minor flooding will continue through early this
  afternoon.
* Forecast...The river will continue to fall to below flood stage by this 
  afternoon.
* Impact...At 13.0 feet...The sewage treatment plant in Schwenksville is 
  flooded.  

 
&&

                         FLD    OBSERVED           FORECAST
 LOCATION                STG    STG  DAY TIME      CREST

Perkiomen Creek
  Graterford             11.0   12.73  Sat 10 AM   Past crest 
 
&&
 
LAT...LON 4024 7549 4024 7542 4011 7542 4012 7547
                                      

$$

CMS

892 
WGUS81 KPHI 031701
FLSPHI
Flood Statement
National Weather Service Mt Holly NJ
101 PM EDT Sat Nov 3 2018

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

  Perkiomen Creek At Graterford affecting Montgomery County

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

PAC091-031731-
/O.CAN.KPHI.FL.W.0053.000000T0000Z-181103T2300Z/
/GRAP1.2.ER.181103T0721Z.181103T1216Z.181103T1533Z.NO/
101 PM EDT Sat Nov 3 2018

The Flood Warning is cancelled for
  The Perkiomen Creek at Graterford.
* At 12:46 PM Saturday the stage was 8.5 feet.
* Flood stage is 11.0 feet.
* Fell below flood stage at 11:33 AM Saturday.
* Forecast...The river will continue to fall to 5.7 feet by tomorrow morning. 

 
&&

                         FLD    OBSERVED           FORECAST
 LOCATION                STG    STG  DAY TIME      CREST

Perkiomen Creek
  Graterford             11.0    8.52  Sat 1 PM    10.2    Sat 2 PM 
 
&&
 
LAT...LON 4024 7549 4024 7542 4011 7542 4012 7547
                                      

$$

CMS

The office that day

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

Issued	Product	Office	Counties	Lasted
Nov 2, 8:22 PM EDT	Areal Flood Advisory	PHI	Berks, Lehigh, Northampton	4 hr
Nov 2, 9:28 PM EDT	Areal Flood Advisory	PHI	Berks, Bucks, Chester, Lehigh, Montgomery, Northampton	4 hr
Nov 2, 9:48 PM EDT	Special Weather Statement	PHI	Berks, Chester	27 min
Nov 2, 10:09 PM EDT	Severe Thunderstorm Warning	PHI	Chester, Delaware, Montgomery	51 min
Nov 2, 10:32 PM EDT	Tornado Warning	PHI	Berks, Chester, Montgomery	28 min
Nov 2, 10:36 PM EDT	Special Weather Statement	PHI	Northampton	24 min
Nov 2, 10:45 PM EDT	Areal Flood Warning	PHI	Berks, Bucks, Chester, Lehigh, Montgomery, Northampton	13 hr
Nov 2, 10:47 PM EDT	Tornado Warning	PHI	Berks, Bucks, Chester, Lehigh, Montgomery, Northampton	43 min
Nov 2, 10:53 PM EDT	Flash Flood Warning	PHI	Berks, Bucks, Chester, Lehigh, Montgomery, Northampton	4 hr
Nov 2, 10:53 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Bucks, Chester, Delaware, Lehigh, Montgomery and 1 more	67 min
Nov 2, 11:23 PM EDT	Tornado Warning	PHI	Bucks, Chester, Delaware, Montgomery, Philadelphia	24 min
Nov 2, 11:25 PM EDT	Areal Flood Advisory	PHI	Bucks, Chester, Delaware, Montgomery, Philadelphia	4 hr
Nov 2, 11:49 PM EDT	Tornado Warning	PHI	Bucks	26 min
Nov 2, 11:53 PM EDT	Areal Flood Advisory	PHI	Bucks	4 hr
Nov 2, 11:53 PM EDT	Special Weather Statement	PHI	Delaware, Philadelphia	37 min
Nov 3, 12:20 AM EDT	Areal Flood Advisory	PHI	Berks, Carbon, Lehigh, Monroe, Northampton	4 hr
Nov 3, 1:03 AM EDT	River Flood Warning	PHI	Lehigh	5 hr
Nov 3, 1:29 AM EDT	Areal Flood Advisory	PHI	Monroe, Northampton	4 hr
Nov 3, 1:41 AM EDT	Areal Flood Advisory	PHI	Bucks	4 hr
Nov 3, 2:03 AM EDT	River Flood Warning	PHI	Chester	6 hr
Nov 3, 2:34 AM EDT	Areal Flood Warning	PHI	Bucks, Northampton	15 hr
Nov 3, 2:40 AM EDT	River Flood Warning	PHI	Chester, Montgomery, Philadelphia	15 hr
Nov 3, 3:21 AM EDT	Areal Flood Warning	PHI	Bucks, Chester, Delaware, Montgomery, Philadelphia	4 hr
Nov 3, 5:00 AM EDT	River Flood Warning	PHI	Chester, Delaware	6 hr
Nov 3, 7:01 AM EDT	Areal Flood Warning	PHI	Bucks, Chester, Delaware, Montgomery, Philadelphia	5 hr
Nov 3, 11:44 AM EDT	Areal Flood Warning	PHI	Berks, Bucks, Chester, Lehigh, Montgomery, Northampton	8 hr
Nov 3, 5:19 PM EDT	Areal Flood Warning	PHI	Northampton	22 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.