Alert archive / Pennsylvania / River Flood Warnings in 2020
River Flood Warning 56, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this river flood warning at Dec 25, 2020, 12:59 AM EST for Chester County, Montgomery County, Philadelphia County, Pennsylvania. It took effect at Dec 25, 2020, 3:00 AM EST. It was in force for 19 hr.
The area
The outline as issued.
The facts
- Issued
- Dec 25, 2020, 12:59 AM EST (05:59 UTC)
- In effect from
- Dec 25, 2020, 3:00 AM EST
- Expired
- Dec 25, 2020, 9:30 PM EST
- In force
- 19 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 06:00 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 14.51 ft at Dec 25, 2020, 7:00 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.
881 WGUS41 KPHI 250559 FLWPHI BULLETIN - EAS ACTIVATION REQUESTED Flood Warning National Weather Service Mount Holly NJ 1259 AM EST Fri Dec 25 2020 ...The National Weather Service in Mount Holly NJ has issued a Flood Warning for the following rivers in Pennsylvania... Schuylkill River At Norristown affecting Philadelphia, Chester, and Montgomery Counties. For the Schuylkill River...including Norristown...Minor flooding is forecast. PRECAUTIONARY/PREPAREDNESS ACTIONS... Turn around...don't drown when encountering flooded roads. Most flood deaths occur in vehicles. Additional information is available at www.weather.gov/phi. PAC029-091-101-251800- /O.NEW.KPHI.FL.W.0056.201225T0800Z-201226T0455Z/ /NRSP1.1.ER.201225T0800Z.201225T1200Z.201225T2254Z.NO/ 1259 AM EST Fri Dec 25 2020 The National Weather Service in Mount Holly has issued a * Flood Warning for the Schuylkill River At Norristown. * Until this evening. * At 12:30 AM EST Friday the stage was 12.8 feet. * Flood stage is 13.0 feet. * Minor flooding is forecast. * Forecast...The river is expected to rise above flood stage early this morning to a crest of 14.4 around daybreak. It will then fall below flood stage late this afternoon. * Impact at 12.5 feet...Flooding occurs in West Norriton. The West Indian Lane bridge begins to flood. 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 14.4 feet on 03/11/2011. && Stream Fld Observed Fcsts (1 am) Crest Location Stg Stg Day/Time Sat Sun Stg Time Date Schuylkill River Norristown 13.0 12.8 Fri 12 a 12.2 10.5 14.4 7am 12/25 && LAT...LON 4006 7542 4013 7534 4002 7517 3997 7525 $$ CMS
2 follow-up statements
497 WGUS81 KPHI 251735 FLSPHI Flood Statement National Weather Service Mount Holly NJ 1235 PM EST Fri Dec 25 2020 ...The Flood Warning continues for the following rivers in Pennsylvania... Schuylkill River At Norristown affecting Philadelphia, Chester, and Montgomery Counties. For the Schuylkill River...including Norristown...Minor flooding is forecast. PRECAUTIONARY/PREPAREDNESS ACTIONS... Turn around...don't drown when encountering flooded roads. Most flood deaths occur in vehicles. Additional information is available at www.weather.gov/phi. PAC029-091-101-260500- /O.CON.KPHI.FL.W.0056.000000T0000Z-201226T0455Z/ /NRSP1.1.ER.201225T0603Z.201225T1800Z.201226T1200Z.NO/ 1235 PM EST Fri Dec 25 2020 ...The Flood Warning remains in effect... The Flood Warning continues for the Schuylkill River At Norristown. * Until this evening. * At 11:30 AM EST Friday the stage was 14.3 feet. * Flood stage is 13.0 feet. * Minor flooding is occurring and minor flooding is forecast. * Recent Activity...The maximum river stage in the 24 hours ending at 11:30 AM EST Friday was 14.5 feet. * Forecast...The river is expected to rise to a crest of 14.6 feet this afternoon. It will then fall below flood stage tomorrow morning. * Impact at 12.5 feet...Flooding occurs in West Norriton. The West Indian Lane bridge begins to flood. Impact at 13.0 feet...Water begins to cover and close Riverview Boulevard in West Norriton. Impact at 15.0 feet...River Road in West Conshohocken begins to flood. The lower garages at the Riverview Landing and the Lofts at Valley Forge start to take on water. The lower section of Port Indian Road in West Norriton becomes impassable. * Flood History...This crest compares to a previous crest of 14.4 feet on 03/11/2011. && Stream Fld Observed Fcsts (1 pm) Crest Location Stg Stg Day/Time Sat Sun Stg Time Date Schuylkill River Norristown 13.0 14.3 Fri 11 a 12.1 10.6 Fluctuating crest && LAT...LON 4006 7542 4013 7534 4002 7517 3997 7525 $$ Kruzdlo
457 WGUS81 KPHI 260230 FLSPHI Flood Statement National Weather Service Mount Holly NJ 930 PM EST Fri Dec 25 2020 ...The Flood Warning is cancelled for the following river in Pennsylvania... Schuylkill River At Norristown affecting Philadelphia, Chester, and Montgomery Counties. PAC029-091-101-260330- /O.CAN.KPHI.FL.W.0056.000000T0000Z-201226T0230Z/ /NRSP1.1.ER.201225T0603Z.201225T1800Z.201226T1200Z.NO/ 930 PM EST Fri Dec 25 2020 ...The Flood Warning for the Schuylkill River At Norristown has been cancelled... The Flood Warning is cancelled for the Schuylkill River At Norristown. * At 8:30 PM EST Friday the stage was 12.98 feet. * Flood stage is 13.0 feet. * Recent Activity...The maximum river stage in the 24 hours ending at 8:30 PM EST Friday was 14.5 feet. * Forecast...The river is expected to continue falling. && Stream Fld Observed Fcsts (7 pm) Crest Location Stg Stg Day/Time Sat Sun Stg Time Date Schuylkill River Norristown 13.0 13.0 Fri 8 pm 11.5 10.3 Crested && LAT...LON 4006 7542 4013 7534 4002 7517 3997 7525 $$ Iovino
The office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Dec 24, 8:47 PM EST | Areal Flood Advisory | PHI | Chester, Delaware, Montgomery, Philadelphia | 6 hr |
| Dec 24, 9:08 PM EST | Coastal Flood Advisory | PHI | Bucks, Philadelphia | 14 hr |
| Dec 24, 9:16 PM EST | Areal Flood Advisory | PHI | Bucks, Lehigh, Northampton | 3 hr |
| Dec 24, 9:38 PM EST | Areal Flood Warning | PHI | Chester, Delaware, Montgomery, Philadelphia | 14 hr |
| Dec 24, 10:09 PM EST | Areal Flood Advisory | PHI | Berks, Carbon, Lehigh, Monroe, Northampton | 6 hr |
| Dec 24, 10:21 PM EST | Areal Flood Warning | PHI | Bucks | 14 hr |
| Dec 24, 10:30 PM EST | River Flood Warning | PHI | Delaware | 10 hr |
| Dec 24, 11:10 PM EST | Areal Flood Advisory | PHI | Bucks | 4 hr |
| Dec 24, 11:26 PM EST | River Flood Warning | PHI | Chester | 13 hr |
| Dec 24, 11:48 PM EST | Areal Flood Warning | PHI | Bucks | 15 hr |
| Dec 24, 11:54 PM EST | Areal Flood Warning | PHI | Lehigh, Monroe, Northampton | 12 hr |
| Dec 25, 12:36 AM EST | River Flood Warning | PHI | Montgomery | 13 hr |
| Dec 25, 12:53 AM EST | Areal Flood Warning | PHI | Chester | 6 hr |
| Dec 25, 1:56 AM EST | Areal Flood Warning | PHI | Bucks, Philadelphia | 7 hr |
| Dec 25, 2:28 AM EST | River Flood Warning | PHI | Bucks | 15 hr |
| Dec 25, 3:29 AM EST | Areal Flood Warning | PHI | Berks | 6 hr |
| Dec 25, 3:33 AM EST | River Flood Warning | PHI | Chester, Delaware | 17 hr |
| Dec 25, 4:00 AM EST | River Flood Warning | PHI | Lehigh, Northampton | 16 hr |
| Dec 25, 4:31 AM EST | Areal Flood Warning | PHI | Carbon, Lehigh, Monroe, Northampton | 7 hr |
| Dec 25, 4:53 AM EST | River Flood Warning | PHI | Berks, Montgomery | 9 hr |
| Dec 25, 6:32 AM EST | River Flood Warning | PHI | Montgomery, Philadelphia | 7 hr |
| Dec 25, 7:28 AM EST | River Flood Warning | PHI | Monroe | 10 hr |
| Dec 25, 12:13 PM EST | Areal Flood Warning | PHI | Carbon, Monroe | 9 hr |
Nearby
River Flood Warnings in Pennsylvania, 2020Every river flood warning in 2020
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.