Alert archive / New Jersey / River Flood Warnings in 2020

River Flood Warning 47, NWS Philadelphia/Mount Holly

December 1, 2020Somerset County, New Jersey

NWS Philadelphia/Mount Holly issued this river flood warning at Dec 1, 2020, 6:31 AM EST for Somerset County, New Jersey. It took effect at Dec 1, 2020, 6:42 AM EST. It was in force for 20 hr.

The area

The outline as issued.

The facts

Issued: Dec 1, 2020, 6:31 AM EST (11:31 UTC)
In effect from: Dec 1, 2020, 6:42 AM EST
Expired: Dec 2, 2020, 3:00 AM EST
In force: 20 hr
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Flood severity: Minor

County Somerset County, NJ

The radar

The Philadelphia radar (KDIX), 61 km from the middle of the area, began a volume at 11:32 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 Millstone River at Blackwells Mills (BKWN4). The gauge peaked at 9.42 ft at Dec 1, 2020, 1:00 PM EST.

Action stage: 7 ft
Minor stage: 9 ft
Moderate stage: 10 ft
Major stage: 15 ft

This gauge today: stage, forecast and historic crests

Stage from the USGS instantaneous record for site 01402000, 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.

651 
WGUS41 KPHI 011131
FLWPHI

BULLETIN - EAS ACTIVATION REQUESTED
Flood Warning
National Weather Service Mount Holly NJ
631 AM EST Tue Dec 1 2020

...The National Weather Service in Mount Holly NJ has issued a Flood 
Warning for the following rivers in New Jersey...

  Millstone River At Blackwells Mills affecting Somerset County.

For the Millstone River...including Blackwells Mills...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.


NJC035-012345-
/O.NEW.KPHI.FL.W.0047.201201T1142Z-201202T0400Z/
/BKWN4.1.ER.201201T1142Z.201201T1800Z.201201T2200Z.NO/
631 AM EST Tue Dec 1 2020

The National Weather Service in Mount Holly has issued a

* Flood Warning for
  the Millstone River At Blackwells Mills.
* Until this evening.
* At 6:15 AM EST Tuesday the stage was 8.8 feet.
* Flood stage is 9.0 feet.
* Minor flooding is forecast.
* Forecast...The river is expected to rise above flood stage this 
  morning to a crest of 9.2 feet this afternoon. It will then fall 
  below flood stage late this afternoon.
* Impact at 6.0 feet...The Griggstown Causeway is closed due to 
  flooding. Impact at 7.0 feet...Several more causeways are closed 
  due to flooding. Impact at 9.0 feet...Flood stage reached with 
  flooding now along River Road in Blackwells Mills and S. River 
  Street in Millstone. Base of Route 533 bridge floods. River Road 
  between Yorktown and Amsterdam is subject to closure. Canal Road 
  near Suydam Road floods. Impact at 10.0 feet...The D&R Canal is 
  flooded by the Millstone River.
* Flood History...This crest compares to a previous crest of 9.2 
  feet on 03/12/2011.

&&


Stream          Fld   Observed        Fcsts (7 am)        Crest
Location        Stg   Stg Day/Time    Wed  Thu        Stg Time Date

Millstone River
Blackwells Mill 9.0   8.8  Tue 6 am   7.5  4.1        9.2 1pm 12/01





&&

LAT...LON 4045 7463 4048 7461 4055 7460 4054 7453
      4046 7454 4043 7456

$$

CMS

2 follow-up statements

245 
WGUS41 KPHI 011602
FLWPHI

BULLETIN - EAS ACTIVATION REQUESTED
Flood Warning
National Weather Service Mount Holly NJ
1102 AM EST Tue Dec 1 2020

...The Flood Warning continues for the following rivers in New 
Jersey...

  Millstone River At Blackwells Mills affecting Somerset County.

For the Millstone River...including Blackwells Mills...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.


NJC035-020400-
/O.CON.KPHI.FL.W.0047.000000T0000Z-201202T0400Z/
/BKWN4.1.ER.201201T1230Z.201201T1515Z.201202T0000Z.NO/
1102 AM EST Tue Dec 1 2020

...The Flood Warning remains in effect...

The Flood Warning continues for
  the Millstone River At Blackwells Mills.
* Until this evening.
* At 10:15 AM EST Tuesday the stage was 9.3 feet.
* Flood stage is 9.0 feet.
* Minor flooding is occurring and minor flooding is forecast.
* Recent Activity...The maximum river stage in the 24 hours ending 
  at 10:15 AM EST Tuesday was 9.3 feet.
* Forecast...The river is expected to fall below flood stage this 
  evening and continue falling to 2.9 feet Friday morning.
* Impact at 6.0 feet...The Griggstown Causway is closed due to 
  flooding. Impact at 7.0 feet...Several more causways are closed 
  due to flooding. Impact at 9.0 feet...Flood stage reached with 
  flooding now along River Road in Blackwells Mills and S. River 
  Street in Millstone. Base of Route 533 bridge floods. River Road 
  between Yorktown and Amsterdam is subject to closure. Canal Road 
  near Suydam Road floods. Impact at 10.0 feet...The D&R Canal is 
  flooded by the Millstone River.
* Flood History...This crest compares to a previous crest of 9.2 
  feet on 03/12/2011.

&&


Stream          Fld   Observed        Fcsts (1 pm)        Crest
Location        Stg   Stg Day/Time    Wed  Thu        Stg Time Date

Millstone River
Blackwells Mill 9.0   9.3  Tue 10 a   6.6  3.5        Nearing crest





&&

LAT...LON 4045 7463 4048 7461 4055 7460 4054 7453
      4046 7454 4043 7456

$$

Kruzdlo

475 
WGUS81 KPHI 012044
FLSPHI

Flood Statement
National Weather Service Mount Holly NJ
344 PM EST Tue Dec 1 2020

...The Flood Warning is extended for the following rivers in New 
Jersey...

  Millstone River At Blackwells Mills affecting Somerset County.

For the Millstone River...including Blackwells Mills...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.


NJC035-020800-
/O.EXT.KPHI.FL.W.0047.000000T0000Z-201202T0800Z/
/BKWN4.1.ER.201201T1230Z.201201T1845Z.201202T0200Z.NO/
344 PM EST Tue Dec 1 2020

...The Flood Warning is now in effect until late tonight...

The Flood Warning continues for
  the Millstone River At Blackwells Mills.
* Until late tonight.
* At 3:15 PM EST Tuesday the stage was 9.4 feet.
* Flood stage is 9.0 feet.
* Minor flooding is occurring and minor flooding is forecast.
* Recent Activity...The maximum river stage in the 24 hours ending 
  at 3:15 PM EST Tuesday was 9.4 feet.
* Forecast...The river is expected to fall below flood stage late 
  this evening and continue falling to 2.8 feet early Friday 
  afternoon.
* Impact at 6.0 feet...The Griggstown Causway is closed due to 
  flooding. Impact at 7.0 feet...Several more causways are closed 
  due to flooding. Impact at 9.0 feet...Flood stage reached with 
  flooding now along River Road in Blackwells Mills and S. River 
  Street in Millstone. Base of Route 533 bridge floods. River Road 
  between Yorktown and Amsterdam is subject to closure. Canal Road 
  near Suydam Road floods. Impact at 10.0 feet...The D&R Canal is 
  flooded by the Millstone River.
* Flood History...This crest compares to a previous crest of 9.2 
  feet on 03/12/2011.

&&


Stream          Fld   Observed        Fcsts (1 pm)        Crest
Location        Stg   Stg Day/Time    Wed  Thu        Stg Time Date

Millstone River
Blackwells Mill 9.0   9.4  Tue 3 pm   6.8  3.5        Cresting   





&&

LAT...LON 4045 7463 4048 7461 4055 7460 4054 7453
      4046 7454 4043 7456

$$

Kruzdlo

The office that day

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

Issued	Product	Office	Counties	Lasted
Nov 30, 7:48 PM EST	Coastal Flood Statement	PHI	Ocean	8 hr
Dec 1, 7:18 AM EST	River Flood Warning	PHI	Middlesex, Somerset	3 hr
Dec 1, 8:49 AM EST	Coastal Flood Statement	PHI	Ocean	7 hr
Dec 1, 12:26 PM EST	River Flood Warning	PHI	Morris	7 hr
Dec 1, 1:37 PM EST	Coastal Flood Advisory	PHI	Burlington, Camden, Gloucester, Mercer	2 hr

Nearby

River Flood Warnings in New Jersey, 2020 Every 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.