Alert archive / New Jersey / River Flood Warnings in 2023

River Flood Warning 10, NWS Philadelphia/Mount Holly

May 1, 2023Somerset County, New Jersey

NWS Philadelphia/Mount Holly issued this river flood warning at May 1, 2023, 3:50 AM EDT for Somerset County, New Jersey. It took effect at May 1, 2023, 8:00 AM EDT. It was in force for 23 hr.

The area

The outline as issued.

The facts

Issued: May 1, 2023, 3:50 AM EDT (07:50 UTC)
In effect from: May 1, 2023, 8:00 AM EDT
Expired: May 2, 2023, 6:46 AM EDT
In force: 23 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 07:51 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 10.07 ft at May 1, 2023, 4:00 PM EDT.

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.

079 
WGUS41 KPHI 010750
FLWPHI

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Flood Warning
National Weather Service Mount Holly NJ
350 AM EDT Mon May 1 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.

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.

The next statement will be issued this afternoon by 400 PM EDT.

&&


NJC035-012000-
/O.NEW.KPHI.FL.W.0010.230501T1200Z-230502T0300Z/
/BKWN4.1.ER.230501T1200Z.230501T1800Z.230501T2100Z.NO/
350 AM EDT Mon May 1 2023

...FLOOD WARNING IN EFFECT FROM THIS MORNING TO LATE THIS EVENING...

* WHAT...Minor flooding is forecast.

* WHERE...Millstone River At Blackwells Mills.

* WHEN...From this morning to late this evening.

* 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 3:15 AM EDT Monday the stage was 8.4 feet.
  - Forecast...The river is expected to rise above flood stage
    this morning to a crest of 9.1 feet this afternoon. It will
    then fall below flood stage late this afternoon.
  - 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 (2 am)        Crest
Location        Stg   Stg Day/Time    Tue  Wed        Stg Time Date

Millstone River
Blackwells Mill 9.0   8.4  Mon 3 am   8.4  5.4        9.1 2pm 5/01


&&

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


$$

Fitzsimmons

4 follow-up statements

171 
WGUS41 KPHI 011559
FLWPHI

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Flood Warning
National Weather Service Mount Holly NJ
1159 AM EDT Mon May 1 2023

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

  Millstone River At Blackwells Mills affecting Somerset County.

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.

The next statement will be issued this evening by 1100 PM EDT.

&&


NJC035-020300-
/O.CON.KPHI.FL.W.0010.000000T0000Z-230502T0300Z/
/BKWN4.2.ER.230501T0908Z.230501T1800Z.230502T0600Z.NO/
1159 AM EDT Mon May 1 2023

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

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

* WHERE...Millstone River At Blackwells Mills.

* WHEN...Until late this evening.

* 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 EDT Monday the stage was 9.9 feet.
  - Recent Activity...The maximum river stage in the 24 hours
    ending at 11:15 AM EDT Monday was 9.9 feet.
  - Forecast...The river is expected to rise to a crest of 10.0
    feet this afternoon. It will then fall below flood stage just
    after midnight tonight.
  - 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 (2 pm)        Crest
Location        Stg   Stg Day/Time    Tue  Wed        Stg Time Date

Millstone River
Blackwells Mill 9.0   9.9  Mon 11 a   7.4  3.8        10.0 2pm 5/01


&&

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


$$

Kruzdlo

333 
WGUS81 KPHI 012049
FLSPHI

Flood Statement
National Weather Service Mount Holly NJ
449 PM EDT Mon May 1 2023

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

  Millstone River At Blackwells Mills affecting Somerset County.

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.

The next statement will be issued this evening by 1100 PM EDT.

&&


NJC035-020300-
/O.CON.KPHI.FL.W.0010.000000T0000Z-230502T0300Z/
/BKWN4.2.ER.230501T0908Z.230501T2015Z.230502T0834Z.NO/
449 PM EDT Mon May 1 2023

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

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

* WHERE...Millstone River At Blackwells Mills.

* WHEN...Until late this evening.

* 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 EDT Monday the stage was 10.1 feet.
  - Recent Activity...The maximum river stage in the 24 hours
    ending at 4:15 PM EDT Monday was 10.1 feet.
  - Forecast...The river is expected to fall below flood stage
    late tonight and continue falling to 2.9 feet early Thursday
    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 (2 pm)        Crest
Location        Stg   Stg Day/Time    Tue  Wed        Stg Time Date

Millstone River
Blackwells Mill 9.0   10.1 Mon 4 pm   7.7  4.3          Near Crest   


&&

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


$$

Kruzdlo

870 
WGUS81 KPHI 020221
FLSPHI

Flood Statement
National Weather Service Mount Holly NJ
1021 PM EDT Mon May 1 2023

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

  Millstone River At Blackwells Mills affecting Somerset County.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

At 9:15 PM EDT Monday, the stage was 9.8 feet.
Forecast...The river is expected to fall below flood stage overnight 
tonight and continue falling to 2.9 feet early Thursday 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

The next statement will be issued Tuesday morning by 700 AM EDT.

&&


NJC035-021100-
/O.EXT.KPHI.FL.W.0010.000000T0000Z-230502T1100Z/
/BKWN4.2.ER.230501T0908Z.230501T2015Z.230502T0834Z.NO/
1021 PM EDT Mon May 1 2023

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

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

* WHERE...Millstone River At Blackwells Mills.

* WHEN...Until tomorrow morning.

* 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 EDT Monday the stage was 9.8 feet.
  - Recent Activity...The maximum river stage in the 24 hours
    ending at 4:15 PM EDT Monday was 10.1 feet.
  - Forecast...The river is expected to fall below flood stage
    late tonight and continue falling to 2.9 feet early Thursday
    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 (8 pm)        Crest
Location        Stg   Stg Day/Time    Tue  Wed        Stg Time Date

Millstone River
Blackwells Mill 9.0   9.8 Mon 9 pm    7.0  4.0         MSG  unknown


&&

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


$$

Brudy

596 
WGUS81 KPHI 021046
FLSPHI

Flood Statement
National Weather Service Mount Holly NJ
646 AM EDT Tue May 2 2023

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

  Millstone River At Blackwells Mills affecting Somerset County.

NJC035-021200-
/O.CAN.KPHI.FL.W.0010.000000T0000Z-230502T1046Z/
/BKWN4.2.ER.230501T0908Z.230501T2015Z.230502T0834Z.NO/
646 AM EDT Tue May 2 2023

...FLOOD WARNING IS CANCELLED...

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

* ADDITIONAL DETAILS...
  - At 6:15 AM EDT Tuesday the stage was 8.8 feet.
  - Recent Activity...The maximum river stage in the 24 hours
    ending at 6:15 AM EDT Tuesday was 10.1 feet.
  - Forecast...The river is expected to remain below flood stage
    and continue falling to 3.4 feet early Thursday afternoon.
  - http://www.weather.gov/safety/flood

&&

Stream          Fld   Observed        Fcsts (8 am)        Crest
Location        Stg   Stg Day/Time    Wed  Thu        Stg Time Date

Millstone River
Blackwells Mill 9.0   8.8 Tue 6 am    5.0  3.5      Crested & Falling


&&

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


$$

Brudy

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 30, 8:34 PM EDT	Areal Flood Advisory	PHI	Burlington, Camden, Gloucester, Mercer, Middlesex, Monmouth	100 min
Apr 30, 8:55 PM EDT	Areal Flood Advisory	PHI	Burlington, Camden, Gloucester	3 hr
Apr 30, 10:14 PM EDT	Areal Flood Warning	PHI	Burlington, Camden, Gloucester, Mercer, Middlesex	3 hr
Apr 30, 10:31 PM EDT	River Flood Warning	PHI	Morris, Somerset	24 hr
Apr 30, 10:34 PM EDT	River Flood Warning	PHI	Burlington	13 hr
Apr 30, 10:37 PM EDT	River Flood Warning	PHI	Essex, Morris, Passaic	6 days
Apr 30, 10:49 PM EDT	Areal Flood Advisory	PHI	Hunterdon, Warren	50 min
Apr 30, 11:03 PM EDT	Areal Flood Advisory	PHI	Middlesex, Morris, Somerset	117 min
Apr 30, 11:11 PM EDT	River Flood Warning	PHI	Morris, Passaic	32 hr
Apr 30, 11:39 PM EDT	Areal Flood Warning	PHI	Hunterdon, Warren	5 hr
May 1, 12:15 AM EDT	Special Marine Warning	PHI		90 min
May 1, 12:17 AM EDT	Special Marine Warning	PHI		88 min
May 1, 12:28 AM EDT	River Flood Warning	PHI	Morris	48 hr
May 1, 12:47 AM EDT	Areal Flood Warning	PHI	Hunterdon, Mercer, Middlesex, Morris, Somerset, Sussex and 1 more	10 hr
May 1, 1:40 AM EDT	Special Marine Warning	PHI		65 min
May 1, 1:41 AM EDT	Special Marine Warning	PHI		64 min
May 1, 2:33 AM EDT	Areal Flood Warning	PHI	Burlington	7 hr
May 1, 3:47 AM EDT	River Flood Warning	PHI	Essex, Morris, Passaic	4 days
May 1, 7:46 AM EDT	Areal Flood Warning	PHI	Monmouth, Ocean	9 hr
May 1, 8:00 AM EDT	Areal Flood Warning	PHI	Cumberland, Gloucester, Salem	60 hr
May 1, 10:48 AM EDT	Areal Flood Warning	PHI	Somerset	6 hr
May 1, 12:18 PM EDT	River Flood Warning	PHI	Essex, Passaic	65 hr
May 1, 12:33 PM EDT	Areal Flood Warning	PHI	Atlantic, Camden, Gloucester	54 hr
May 1, 4:38 PM EDT	Special Weather Statement	PHI	Warren	37 min
May 1, 5:16 PM EDT	Special Weather Statement	PHI	Morris, Sussex, Warren	44 min

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.