Alert archive / New Jersey / River Flood Warnings in 2023

River Flood Warning 91, NWS Philadelphia/Mount Holly

December 28, 2023Somerset County, New Jersey

NWS Philadelphia/Mount Holly issued this river flood warning at Dec 28, 2023, 11:32 AM EST for Somerset County, New Jersey. It took effect at Dec 28, 2023, 12:47 PM EST. It was in force for 22 hr.

The area

The outline as issued.

The facts

Issued: Dec 28, 2023, 11:32 AM EST (16:32 UTC)
In effect from: Dec 28, 2023, 12:47 PM EST
Expired: Dec 29, 2023, 10:48 AM EST
In force: 22 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 16:36 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 10.03 ft at Dec 28, 2023, 11:00 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.

540 
WGUS41 KPHI 281632
FLWPHI

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Flood Warning
National Weather Service Mount Holly NJ
1132 AM EST Thu Dec 28 2023

...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...

Please report observed flooding to local emergency services or law 
enforcement and request they pass this information to the National 
Weather Service when you can do so safely.

Turn around...don't drown when encountering flooded roads. Most 
flood deaths occur in vehicles.

Additional information is available at www.weather.gov/phi.

The next statement will be issued this evening at 1145 PM EST.

&&

NJC035-290445-
/O.NEW.KPHI.FL.W.0091.231228T1747Z-231229T2145Z/
/BKWN4.1.ER.231228T1747Z.231229T0600Z.231229T1545Z.NO/
1132 AM EST Thu Dec 28 2023

...FLOOD WARNING IN EFFECT UNTIL TOMORROW AFTERNOON...

* WHAT...Minor flooding is forecast.

* WHERE...Millstone River at Blackwells Mills.

* WHEN...Until tomorrow afternoon.

* IMPACTS...At 6.0 feet, The Griggstown Causeway is closed due to 
  flooding.
  At 7.0 feet, Several more causeways are closed due to flooding.
  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.
  At 10.0 feet, The D&R Canal is flooded by the Millstone River.

* ADDITIONAL DETAILS...
  - At 11:15 AM EST Thursday the stage was 8.3 feet and rising.
  - Forecast...The river is expected to rise above flood stage
    this afternoon to a crest of 9.8 feet just after midnight
    tonight. It will then fall below flood stage late tomorrow
    morning.
  - Flood stage is 9.0 feet.
  - Flood History...This crest compares to a previous crest of
    9.8 feet on 01/24/1998.
  - http://www.weather.gov/safety/flood

&&

Stream          Fld   Observed        Fcsts (1 pm)        Crest
Location        Stg   Stg Day/Time    Fri  Sat        Stg Time Date

Millstone River
Blackwells Mill 9.0   8.3  Thu 11 a   8.7  3.8        9.8 1am 12/29


&&

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


$$

Hoeflich

5 follow-up statements

816 
WGUS81 KPHI 282201
FLSPHI

Flood Statement
National Weather Service Mount Holly NJ
501 PM EST Thu Dec 28 2023

...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...

Please report observed flooding to local emergency services or law 
enforcement and request they pass this information to the National 
Weather Service when you can do so safely.

Turn around...don't drown when encountering flooded roads. Most 
flood deaths occur in vehicles.

Additional information is available at www.weather.gov/phi.

The next statement will be issued late tonight at 515 AM EST.

&&

NJC035-291015-
/O.EXT.KPHI.FL.W.0091.000000T0000Z-231229T2100Z/
/BKWN4.1.ER.231228T1922Z.231229T0600Z.231229T1832Z.NO/
501 PM EST Thu Dec 28 2023

...FLOOD WARNING NOW IN EFFECT UNTIL TOMORROW AFTERNOON...

* WHAT...Minor flooding is occurring and minor flooding is forecast.

* WHERE...Millstone River at Blackwells Mills.

* WHEN...Until tomorrow afternoon.

* IMPACTS...At 6.0 feet, The Griggstown Causeway is closed due to 
  flooding.
  At 7.0 feet, Several more causeways are closed due to flooding.
  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.
  At 10.0 feet, The D&R Canal is flooded by the Millstone River.

* ADDITIONAL DETAILS...
  - At 4:15 PM EST Thursday the stage was 9.3 feet.
  - Recent Activity...The maximum river stage in the 24 hours
    ending at 4:15 PM EST Thursday was 9.3 feet.
  - Forecast...The river is expected to rise to a crest of 9.9
    feet just after midnight tonight. It will then fall below
    flood stage early tomorrow afternoon.
  - Flood stage is 9.0 feet.
  - Flood History...This crest compares to a previous crest of
    9.9 feet on 01/28/1996.
  - http://www.weather.gov/safety/flood

&&

Stream          Fld   Observed        Fcsts (7 pm)        Crest
Location        Stg   Stg Day/Time    Fri  Sat        Stg Time Date

Millstone River
Blackwells Mill 9.0   9.3  Thu 4 pm   8.0  3.3        9.9 1am 12/29


&&

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


$$

Staarmann

859 
WGUS41 KPHI 290249
FLWPHI

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Flood Warning
National Weather Service Mount Holly NJ
949 PM EST Thu Dec 28 2023

...Forecast flooding changed from Minor to Moderate severity for the 
following rivers in New Jersey...

  Millstone River At Blackwells Mills affecting Somerset County.



For the Millstone River...including Blackwells Mills...Moderate 
flooding is forecast.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Please report observed flooding to local emergency services or law 
enforcement and request they pass this information to the National 
Weather Service when you can do so safely.

Turn around...don't drown when encountering flooded roads. Most 
flood deaths occur in vehicles.

Additional information is available at www.weather.gov/phi.

The next statement will be issued Friday morning at 1000 AM EST.

&&

NJC035-291500-
/O.CON.KPHI.FL.W.0091.000000T0000Z-231229T2100Z/
/BKWN4.2.ER.231228T1922Z.231229T0600Z.231229T1830Z.NO/
949 PM EST Thu Dec 28 2023

...FLOOD WARNING REMAINS IN EFFECT UNTIL TOMORROW AFTERNOON...

* WHAT...Moderate flooding is occurring and moderate flooding is 
  forecast.

* WHERE...Millstone River at Blackwells Mills.

* WHEN...Until tomorrow afternoon.

* IMPACTS...At 6.0 feet, The Griggstown Causeway is closed due to 
  flooding.
  At 7.0 feet, Several more causeways are closed due to flooding.
  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.
  At 10.0 feet, The D&R Canal is flooded by the Millstone River.

* ADDITIONAL DETAILS...
  - At 9:15 PM EST Thursday the stage was 10.0 feet.
  - Recent Activity...The maximum river stage in the 24 hours
    ending at 9:15 PM EST Thursday was 10.0 feet.
  - Forecast...The river is expected to rise to a crest of 10.1
    feet just after midnight tonight. It will then fall below
    flood stage early tomorrow afternoon.
  - Flood stage is 9.0 feet.
  - Flood History...This crest compares to a previous crest of
    9.9 feet on 11/20/2003.
  - http://www.weather.gov/safety/flood

&&

Stream          Fld   Observed        Fcsts (7 pm)        Crest
Location        Stg   Stg Day/Time    Fri  Sat        Stg Time Date

Millstone River
Blackwells Mill 9.0   10.0 Thu 9 pm   7.9  3.3        10.1 1am 12/29


&&

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


$$

Staarmann

783 
WGUS81 KPHI 290952
FLSPHI

Flood Statement
National Weather Service Mount Holly NJ
452 AM EST Fri Dec 29 2023

...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.

Please report observed flooding to local emergency services or law 
enforcement and request they pass this information to the National 
Weather Service when you can do so safely.

Additional information is available at www.weather.gov/phi.

The next statement will be issued this afternoon at 400 PM EST.

&&

NJC035-292100-
/O.CON.KPHI.FL.W.0091.000000T0000Z-231229T2100Z/
/BKWN4.1.ER.231228T1922Z.231229T0500Z.231229T1800Z.NO/
452 AM EST Fri Dec 29 2023

...FLOOD WARNING REMAINS IN EFFECT UNTIL LATE THIS AFTERNOON...

* WHAT...Minor flooding is occurring and minor flooding is forecast.

* WHERE...Millstone River at Blackwells Mills.

* WHEN...Until late this afternoon.

* IMPACTS...At 6.0 feet, The Griggstown Causeway is closed due to 
  flooding.
  At 7.0 feet, Several more causeways are closed due to flooding.
  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.
  At 10.0 feet, The D&R Canal is flooded by the Millstone River.

* ADDITIONAL DETAILS...
  - At 4:15 AM EST Friday the stage was 9.7 feet.
  - Recent Activity...The maximum river stage in the 24 hours
    ending at 4:15 AM EST Friday was 10.0 feet.
  - Forecast...The river is expected to fall below flood stage
    this afternoon and continue falling to 2.5 feet early Monday
    morning.
  - Flood stage is 9.0 feet.
  - Flood History...This crest compares to a previous crest of
    9.7 feet on 05/11/1998.
  - http://www.weather.gov/safety/flood

&&

Stream          Fld   Observed        Fcsts (7 am)        Crest
Location        Stg   Stg Day/Time    Sat  Sun        Stg Time Date

Millstone River
Blackwells Mill 9.0   9.7  Fri 4 am   4.9  2.7      Crested & falling


&&

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


$$

AKL

084 
WGUS81 KPHI 291356
FLSPHI

Flood Statement
National Weather Service Mount Holly NJ
856 AM EST Fri Dec 29 2023

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

  Millstone River At Blackwells Mills affecting Somerset County.



PRECAUTIONARY/PREPAREDNESS ACTIONS...

Please report observed flooding to local emergency services or law 
enforcement and request they pass this information to the National 
Weather Service when you can do so safely.

Turn around...don't drown when encountering flooded roads. Most 
flood deaths occur in vehicles.

Additional information is available at www.weather.gov/phi.

The next statement will be issued this afternoon at 400 PM EST.

&&

NJC035-292100-
/O.CON.KPHI.FL.W.0091.000000T0000Z-231229T2100Z/
/BKWN4.1.ER.231228T1922Z.231229T0500Z.231229T1556Z.NO/
856 AM EST Fri Dec 29 2023

...FLOOD WARNING REMAINS IN EFFECT UNTIL LATE THIS AFTERNOON...

* WHAT...Minor flooding is occurring.

* WHERE...Millstone River at Blackwells Mills.

* WHEN...Until late this afternoon.

* IMPACTS...At 6.0 feet, The Griggstown Causeway is closed due to 
  flooding.
  At 7.0 feet, Several more causeways are closed due to flooding.
  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.

* ADDITIONAL DETAILS...
  - At 8:15 AM EST Friday the stage was 9.3 feet.
  - Recent Activity...The maximum river stage in the 24 hours
    ending at 8:15 AM EST Friday was 10.0 feet.
  - Forecast...The river is expected to fall below flood stage
    late this morning and continue falling to 2.5 feet Monday
    morning.
  - Flood stage is 9.0 feet.
  - Flood History...This crest compares to a previous crest of
    9.2 feet on 03/12/2011.
  - http://www.weather.gov/safety/flood

&&

Stream          Fld   Observed        Fcsts (7 am)        Crest
Location        Stg   Stg Day/Time    Sat  Sun        Stg Time Date

Millstone River
Blackwells Mill 9.0   9.3  Fri 8 am   4.9  2.7      Crested & falling


&&

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


$$

Wunderlin

026 
WGUS81 KPHI 291548
FLSPHI

Flood Statement
National Weather Service Mount Holly NJ
1048 AM EST Fri Dec 29 2023

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

  Millstone River At Blackwells Mills affecting Somerset County.



NJC035-291700-
/O.CAN.KPHI.FL.W.0091.000000T0000Z-231229T1548Z/
/BKWN4.1.ER.231228T1922Z.231229T0500Z.231229T1511Z.NO/
1048 AM EST Fri Dec 29 2023

...FLOOD WARNING IS CANCELLED...

The Flood Warning is cancelled for the Millstone River At Blackwells 
Mills.

* ADDITIONAL DETAILS...
  - At 10:15 AM EST Friday the stage was 8.99 feet.
  - At 10:15 AM EST Friday the river fell below flood stage.
  - Forecast...The river is expected to fall to 2.5 feet Monday
    morning.
  - http://www.weather.gov/safety/flood

&&

Stream          Fld   Observed        Fcsts (1 pm)        Crest
Location        Stg   Stg Day/Time    Sat  Sun        Stg Time Date

Millstone River
Blackwells Mill 9.0  8.99  Fri 10:15 a 3.9  2.6     Crested & falling


&&

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


$$

Wunderlin

The office that day

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

Issued	Product	Office	Counties	Lasted
Dec 27, 11:29 PM EST	Areal Flood Warning	PHI	Burlington, Camden, Gloucester, Hunterdon, Mercer, Morris and 3 more	8 hr
Dec 28, 12:10 AM EST	Small Craft Advisory	PHI		30 hr
Dec 28, 12:24 AM EST	Areal Flood Warning	PHI	Hunterdon	9 hr
Dec 28, 12:26 AM EST	Areal Flood Advisory	PHI	Mercer, Middlesex, Monmouth, Morris, Somerset, Sussex	84 min
Dec 28, 1:37 AM EST	River Flood Warning	PHI	Hunterdon, Somerset	12 hr
Dec 28, 1:50 AM EST	Areal Flood Warning	PHI	Mercer, Middlesex, Monmouth, Morris, Somerset, Sussex	6 hr
Dec 28, 2:33 AM EST	Coastal Flood Advisory	PHI	Atlantic, Burlington, Camden, Cape May, Cumberland, Gloucester and 4 more	39 hr
Dec 28, 2:48 AM EST	Areal Flood Warning	PHI	Morris	8 hr
Dec 28, 3:22 AM EST	Areal Flood Warning	PHI	Somerset	8 hr
Dec 28, 3:41 AM EST	River Flood Warning	PHI	Somerset	16 hr
Dec 28, 4:05 AM EST	River Flood Warning	PHI	Morris, Somerset	21 days
Dec 28, 8:31 AM EST	River Flood Warning	PHI	Middlesex, Somerset	16 hr
Dec 28, 9:05 AM EST	River Flood Warning	PHI	Essex, Morris, Passaic	5 days
Dec 28, 9:30 AM EST	River Flood Warning	PHI	Passaic	11 hr
Dec 28, 10:48 AM EST	Areal Flood Warning	PHI	Morris	3 hr
Dec 28, 11:02 AM EST	River Flood Warning	PHI	Middlesex, Somerset	15 hr
Dec 28, 11:05 AM EST	River Flood Warning	PHI	Morris	33 hr
Dec 28, 11:38 AM EST	River Flood Warning	PHI	Essex, Morris, Passaic	3 days
Dec 28, 12:18 PM EST	River Flood Warning	PHI	Essex, Passaic	70 hr

Nearby

River Flood Warnings in New Jersey, 2023 Every river flood warning in 2023

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.