Alert archive / New Jersey / Areal Flood Warnings in 2021
Areal Flood Warning 3, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this areal flood warning at Mar 24, 2021, 8:12 PM EDT for Hunterdon County, Mercer County, Somerset County, New Jersey. It was in force for 4 hr. 1 report came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- Mar 24, 2021, 8:12 PM EDT (00:12 UTC)
- Expired
- Mar 25, 2021, 12:15 AM EDT
- In force
- 4 hr
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Flood severity
- None
Counties Hunterdon County, NJ, Mercer County, NJ, Somerset County, NJ
The radar
The Philadelphia radar (KDIX), 61 km from the middle of the area, began a volume at 00:11 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Mar 24, 8:15 PM EDT | FLOOD | 3 Ne Ringoes, NJ | THE NESHANIC RIVER AT REAVILLE (REAN4) REACHED MINOR FLOOD STAGE AT 815 PM, CRESTING AT 7.24 FEET AT 915 PM. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Brookhaven, NY (KOKX), launched 00:00Z, 0.2 hours before the alert went out and 172 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 4 J/kg
- Mixed-layer CIN
- -48 J/kg
- Mixed-layer LCL
- 510 m above ground
- 0-6 km bulk shear
- 39 kt
- 0-1 km storm-relative helicity
- 209 m²/s²
- 0-3 km storm-relative helicity
- 270 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
713
WGUS41 KPHI 250012
FLWPHI
BULLETIN - EAS ACTIVATION REQUESTED
Flood Warning
National Weather Service Mount Holly NJ
812 PM EDT Wed Mar 24 2021
NJC019-021-035-250415-
/O.NEW.KPHI.FA.W.0003.210325T0012Z-210325T0415Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Hunterdon NJ-Mercer NJ-Somerset NJ-
812 PM EDT Wed Mar 24 2021
The National Weather Service in Mount Holly has issued a
* Flood Warning for...
Northwestern Mercer County in central New Jersey...
Southwestern Somerset County in northern New Jersey...
Southeastern Hunterdon County in northwestern New Jersey...
* Until 1215 AM EDT.
* At 812 PM EDT, Doppler radar and automated rain gauges indicated
heavy rain. Flooding is ongoing or expected to begin shortly in
the warned area. Between 1 and 1.5 inches of rain have fallen.
* Flooding is expected along the Neshanic River near Reaville.
Some locations that may experience flooding include...
Ewing, Princeton, Flemington, Pennington, Hopewell, Skillman,
Cloverhill, Lawrenceville, and Princeton North.
This includes the following highways...
Interstate 295 in New Jersey between mile markers 72 and 74.
Additional rainfall amounts up to 0.5 inches are possible in the
warned area.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around...don't drown when encountering flooded roads. Most
flood deaths occur in vehicles.
&&
LAT...LON 4050 7491 4050 7479 4043 7464 4031 7470
4028 7481 4032 7488
$$
SFJ2 follow-up statements
715
WGUS81 KPHI 250228
FLSPHI
Flood Statement
National Weather Service Mount Holly NJ
1028 PM EDT Wed Mar 24 2021
NJC019-021-035-250415-
/O.CON.KPHI.FA.W.0003.000000T0000Z-210325T0415Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Hunterdon NJ-Mercer NJ-Somerset NJ-
1028 PM EDT Wed Mar 24 2021
...FLOOD WARNING REMAINS IN EFFECT UNTIL 1215 AM EDT THURSDAY FOR
NORTHWESTERN MERCER, SOUTHWESTERN SOMERSET, AND SOUTHEASTERN
HUNTERDON COUNTIES...
At 1028 PM EDT, gauge reports indicated minor flooding is occurring
along the Neshanic River near Reaville. Between 1 and 2 inches of
rain have fallen.
For Neshanic at Reaville:
At 10:15pm the stage was 7.02 feet.
Flood Stage is 6.5 feet.
This includes the following highways...
Interstate 295 in New Jersey between mile markers 72 and 74.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Be especially cautious at night when it is harder to recognize the
dangers of flooding.
&&
LAT...LON 4050 7491 4050 7479 4043 7464 4031 7470
4028 7481 4032 7488
$$
SFJ468
WGUS81 KPHI 250407
FLSPHI
Flood Statement
National Weather Service Mount Holly NJ
1207 AM EDT Thu Mar 25 2021
NJC019-021-035-250417-
/O.EXP.KPHI.FA.W.0003.000000T0000Z-210325T0415Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Hunterdon NJ-Mercer NJ-Somerset NJ-
1207 AM EDT Thu Mar 25 2021
...FLOOD WARNING WILL EXPIRE AT 1215 AM EDT EARLY THIS MORNING FOR
NORTHWESTERN MERCER, SOUTHWESTERN SOMERSET, AND SOUTHEASTERN
HUNTERDON COUNTIES...
Flood waters have receded. Flooding is no longer expected to pose a
threat. Please continue to heed remaining road closures.
LAT...LON 4050 7491 4050 7479 4043 7464 4031 7470
4028 7481 4032 7488
$$
CMSThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 25, 3:13 AM EDT | Small Craft Advisory | PHI | 48 hr | |
| Mar 25, 11:00 AM EDT | Wind Advisory | PHI | Atlantic, Burlington, Camden, Cape May, Cumberland, Gloucester and 10 more | 32 hr |
| Mar 25, 6:25 PM EDT | Marine Dense Fog Advisory | PHI | 10 hr |
Nearby
Areal Flood Warnings in New Jersey, 2021Every areal flood warning in 2021
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.