Alert archive / Pennsylvania / River Flood Warnings in 2020
River Flood Warning 53, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this river flood warning at Dec 24, 2020, 11:26 PM EST for Chester County, Pennsylvania. It took effect at Dec 24, 2020, 11:43 PM EST. It was in force for 13 hr.
The area
The outline as issued.
The facts
- Issued
- Dec 24, 2020, 11:26 PM EST (04:26 UTC)
- In effect from
- Dec 24, 2020, 11:43 PM EST
- Expired
- Dec 25, 2020, 12:42 PM EST
- In force
- 13 hr
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Flood severity
- Minor
County Chester County, PA
The radar
The Philadelphia radar (KDIX), 107 km from the middle of the area, began a volume at 04:29 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 East Branch Brandywine Creek below Downingtown (DWNP1). The gauge peaked at 10.09 ft at Dec 25, 2020, 4:00 AM EST.
- Action stage
- 6 ft
- Minor stage
- 7 ft
- Moderate stage
- 9 ft
- Major stage
- 11 ft
This gauge today: stage, forecast and historic crests
Stage from the USGS instantaneous record for site 01480870, 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.
340 WGUS41 KPHI 250426 FLWPHI BULLETIN - EAS ACTIVATION REQUESTED Flood Warning National Weather Service Mount Holly NJ 1126 PM EST Thu Dec 24 2020 ...The National Weather Service in Mount Holly NJ has issued a Flood Warning for the following rivers in Pennsylvania... East Branch Brandywine Creek Below Downingtown affecting Chester County. For the Brandywine Creek...including Downingtown...Minor flooding is forecast. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Flood Warning means that flooding is imminent or occurring. All interested parties should take necessary precautions immediately. Additional information is available at www.weather.gov/phi. PAC029-251200- /O.NEW.KPHI.FL.W.0053.201225T0443Z-201225T1200Z/ /DWNP1.1.ER.201225T0443Z.201225T0600Z.201225T0836Z.NO/ 1126 PM EST Thu Dec 24 2020 The National Weather Service in Mount Holly has issued a * Flood Warning for the East Branch Brandywine Creek Below Downingtown. * Until Friday morning. * At 11:17 PM EST Thursday the stage was 6.3 feet. * Flood stage is 7.0 feet. * Minor flooding is forecast. * Forecast...The river will rise above flood stage late this evening to 8.0 feet just after midnight tonight. It will then fall below flood stage late tonight to 4.3 feet and begin rising again early tomorrow afternoon. It will rise to 4.4 feet early tomorrow afternoon. It will then fall to 4.1 feet and begin rising again late tomorrow evening. It will then rise again but remain below flood stage. * Impact at 8.0 feet...Dowlin Forge Road begins to flood. * Flood History...This crest compares to a previous crest of 8.3 feet on 06/04/2003. && Stream Fld Observed Fcsts (11 pm) Crest Location Stg Stg Day/Time Fri Sat Stg Time Date East Branch Bran Downingtown 7.0 6.3 Thu 11 p 4.2 MSG 8.0 1am 12/25 && LAT...LON 4002 7567 3993 7561 3990 7567 4001 7573 $$ Iovino
2 follow-up statements
901 WGUS41 KPHI 250632 FLWPHI BULLETIN - EAS ACTIVATION REQUESTED Flood Warning National Weather Service Mount Holly NJ 132 AM EST Fri Dec 25 2020 ...Forecast flooding changed from Minor to Moderate severity and increased in duration for the following rivers in Pennsylvania... East Branch Brandywine Creek Below Downingtown affecting Chester County. For the Brandywine Creek...including Downingtown...Moderate flooding is forecast. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Flood Warning means that flooding is imminent or occurring. All interested parties should take necessary precautions immediately. Turn around...don't drown when encountering flooded roads. Most flood deaths occur in vehicles. Additional information is available at www.weather.gov/phi. PAC029-251845- /O.EXT.KPHI.FL.W.0053.000000T0000Z-201226T0014Z/ /DWNP1.2.ER.201225T0437Z.201225T1000Z.201225T1814Z.NO/ 132 AM EST Fri Dec 25 2020 ...Forecast flooding increased from Minor to Moderate severity and increased in duration until this evening... The Flood Warning continues for the East Branch Brandywine Creek Below Downingtown. * Until this evening. * At 1:17 AM EST Friday the stage was 8.8 feet. * Flood stage is 7.0 feet. * Minor flooding is occurring and moderate flooding is forecast. * Recent Activity...The maximum river stage in the 24 hours ending at 1:17 AM EST Friday was 8.8 feet. * Forecast...The river is expected to rise to a crest of 10.8 feet early this morning. It will then fall below flood stage this afternoon. * Impact at 9.0 feet...High water on the Brandywine sends backwater up Beaver Creek. Beaver Creek floods inundating parks and the Downingtown Little League fields. Impact at 11.0 feet...Jefferson Avenue in Downingtown floods. Business Route 30 and Pennsylvania Avenue also flood. * Flood History...This crest compares to a previous crest of 10.8 feet on 12/17/2000. && Stream Fld Observed Fcsts (2 am) Crest Location Stg Stg Day/Time Sat Sun Stg Time Date East Branch Bran Downingtown 7.0 8.8 Fri 1 am 4.0 MSG 10.8 5am 12/25 && LAT...LON 4002 7567 3993 7561 3990 7567 4001 7573 $$ CMS
166 WGUS81 KPHI 251742 FLSPHI Flood Statement National Weather Service Mount Holly NJ 1242 PM EST Fri Dec 25 2020 ...The Flood Warning is cancelled for the following rivers in Pennsylvania... East Branch Brandywine Creek Below Downingtown affecting Chester County. PAC029-251845- /O.CAN.KPHI.FL.W.0053.000000T0000Z-201225T1742Z/ /DWNP1.2.ER.201225T0437Z.201225T1000Z.201225T1814Z.NO/ 1242 PM EST Fri Dec 25 2020 ...The Flood Warning for the East Branch Brandywine Creek Below Downingtown has been cancelled... The Flood Warning is cancelled for the East Branch Brandywine Creek Below Downingtown. * At 11:45 AM EST Friday the stage was 6.2 feet. * Flood stage is 7.0 feet. * Forecast...The river will continue to fall below this afternoon. && Stream Fld Observed Fcsts (unknown Crest Location Stg Stg Day/Time d1 d2 Stg Time Date East Branch Bran Downingtown 7.0 6.2 Fri 11 a MSG MSG Crested && LAT...LON 4002 7567 3993 7561 3990 7567 4001 7573 $$ Kruzdlo
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, 11:48 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, 12:59 AM EST | River Flood Warning | PHI | Chester, Montgomery, Philadelphia | 21 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.