Alert archive / New Jersey / Severe Thunderstorm Warnings in 2025
Severe Thunderstorm Warning 219, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Sep 6, 2025, 2:14 PM EDT for 4 counties in New Jersey. It was in force for 46 min. 8 reports 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
- Sep 6, 2025, 2:14 PM EDT (18:14 UTC)
- Expired
- Sep 6, 2025, 3:00 PM EDT
- In force
- 46 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties Hunterdon County, NJ, Mercer County, NJ, Middlesex County, NJ, Somerset County, NJ
The radar
The Philadelphia radar (KDIX), 58 km from the middle of the area, began a volume at 18:16 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 |
|---|---|---|---|
| Sep 6, 2:21 PM EDT | TSTM WND DMG | East Amwell Twp, NJ | Trees and wires down. Time estimated from radar. |
| Sep 6, 2:34 PM EDT | TSTM WND DMG | Hillsborough Twp, NJ | Trees and wires down. Time estimated from radar. |
| Sep 6, 2:34 PM EDT | TSTM WND DMG | Montgomery Twp, NJ | Numerous trees and wires down. Time estimated from radar. |
| Sep 6, 2:40 PM EDT | HAIL 0.88 | Hillsborough Twp, NJ | Nickel size hail in Hillsborough. |
| Sep 6, 2:44 PM EDT | TSTM WND DMG | 1 Ese Millstone, NJ | Several trees down at Amwell Rd and Elizabeth Ave. Time estimated from radar. |
| Sep 6, 2:46 PM EDT | TSTM WND DMG | 1 Ese Hillsborough Twp, NJ | Delayed report. Part of a barn roof peeled off and large branches down. Time from report. |
| Sep 6, 2:46 PM EDT | TSTM WND DMG | Franklin Township, NJ | Tree down blocking road at South Middlebash Rd near Blackwells Mills Rd. Time estimated from radar. |
| Sep 6, 2:52 PM EDT | TSTM WND DMG | North Brunswick Twp, NJ | Large tree fell, knocking down power poles. Picture relayed on social media. Time estimated from radar. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Sep 6, 1:13 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
The nearest sounding before it
Brookhaven, NY (KOKX), launched 12:00Z, 6.2 hours before the alert went out and 167 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
- 975 J/kg
- Mixed-layer CIN
- -68 J/kg
- Mixed-layer LCL
- 816 m above ground
- 0-6 km bulk shear
- 43 kt
- 0-1 km storm-relative helicity
- 74 m²/s²
- 0-3 km storm-relative helicity
- 85 m²/s²
- Significant tornado parameter
- 0.3
- Supercell composite
- 3.5
The text
As transmitted.
691
WUUS51 KPHI 061814
SVRPHI
NJC019-021-023-035-061900-
/O.NEW.KPHI.SV.W.0219.250906T1814Z-250906T1900Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
214 PM EDT Sat Sep 6 2025
The National Weather Service in Mount Holly NJ has issued a
* Severe Thunderstorm Warning for...
Southeastern Hunterdon County in northwestern New Jersey...
Northwestern Mercer County in central New Jersey...
Southern Somerset County in northern New Jersey...
Northwestern Middlesex County in northern New Jersey...
* Until 300 PM EDT.
* At 214 PM EDT, a severe thunderstorm was located over Stockton, or
16 miles northwest of Trenton, moving east at 35 mph.
HAZARD...60 mph wind gusts and penny size hail.
SOURCE...Radar indicated.
IMPACT...Damage to roofs, siding, trees, and power lines is
possible.
* Locations impacted include...
New Brunswick, Somerville, Somerset, Old Bridge, East Brunswick,
South Brunswick, North Brunswick, Middlesex, Princeton, Bound
Brook, Manville, Jamesburg, Flemington, Pennington, Hopewell, Rocky
Hill, Millstone, Skillman, Flagtown, and Kingston.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
In addition to large hail and damaging winds, frequent cloud to
ground lightning is occurring with this storm. Move indoors
immediately. Remember, if you can hear thunder, you are close enough
to be struck by lightning.
&&
LAT...LON 4030 7488 4032 7491 4047 7500 4062 7448
4037 7433
TIME...MOT...LOC 1814Z 259DEG 31KT 4039 7499
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
PO1 follow-up statement
076
WWUS51 KPHI 061835
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
235 PM EDT Sat Sep 6 2025
NJC019-021-061844-
/O.CAN.KPHI.SV.W.0219.000000T0000Z-250906T1900Z/
Hunterdon NJ-Mercer NJ-
235 PM EDT Sat Sep 6 2025
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN HUNTERDON AND
NORTHWESTERN MERCER COUNTIES IS CANCELLED...
The severe thunderstorm which prompted the warning has moved out of
the warned area. Therefore, the warning has been cancelled.
A Severe Thunderstorm Watch remains in effect until 800 PM EDT for
central, northern and northwestern New Jersey.
LAT...LON 4033 7463 4038 7462 4039 7467 4038 7472
4051 7478 4054 7475 4062 7448 4037 7433
TIME...MOT...LOC 1834Z 259DEG 31KT 4042 7476
$$
NJC023-035-061900-
/O.CON.KPHI.SV.W.0219.000000T0000Z-250906T1900Z/
Somerset NJ-Middlesex NJ-
235 PM EDT Sat Sep 6 2025
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 300 PM EDT
FOR SOUTHERN SOMERSET AND NORTHWESTERN MIDDLESEX COUNTIES...
At 234 PM EDT, a severe thunderstorm was located over Hopewell, or 12
miles southwest of Somerville, moving east at 35 mph.
HAZARD...60 mph wind gusts and nickel size hail.
SOURCE...Radar indicated.
IMPACT...Damage to roofs, siding, trees, and power lines is
possible.
Locations impacted include...
New Brunswick, Somerville, Somerset, Old Bridge, East Brunswick,
South Brunswick, North Brunswick, Middlesex, Bound Brook, Manville,
Jamesburg, Rocky Hill, Millstone, Skillman, Flagtown, Kingston,
Dayton, Belle Mead, North Brunswick Township, and Kendall Park.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Frequent cloud to ground lightning is occurring with this storm. Move
indoors immediately. Lightning is one of nature's leading killers.
Remember, if you can hear thunder, you are close enough to be struck
by lightning.
&&
LAT...LON 4033 7463 4038 7462 4039 7467 4038 7472
4051 7478 4054 7475 4062 7448 4037 7433
TIME...MOT...LOC 1834Z 259DEG 31KT 4042 7476
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.88 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
POThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 6, 2:22 AM EDT | Small Craft Advisory | PHI | 19 hr | |
| Sep 6, 2:46 PM EDT | Severe Thunderstorm Warning | PHI | Middlesex, Somerset | 23 min |
| Sep 6, 2:47 PM EDT | Severe Thunderstorm Warning | PHI | Atlantic, Burlington, Camden, Gloucester | 43 min |
| Sep 6, 2:52 PM EDT | Special Marine Warning | PHI | 23 min | |
| Sep 6, 3:34 PM EDT | Special Marine Warning | PHI | 56 min | |
| Sep 6, 3:38 PM EDT | Severe Thunderstorm Warning | PHI | Burlington, Ocean | 38 min |
| Sep 6, 4:23 PM EDT | Special Marine Warning | PHI | 24 min | |
| Sep 6, 4:57 PM EDT | Severe Thunderstorm Warning | PHI | Atlantic, Burlington, Camden | 31 min |
| Sep 6, 5:20 PM EDT | Special Marine Warning | PHI | 25 min | |
| Sep 6, 5:51 PM EDT | Special Marine Warning | PHI | 54 min | |
| Sep 6, 6:07 PM EDT | Special Marine Warning | PHI | 38 min | |
| Sep 6, 6:20 PM EDT | Flash Flood Warning | PHI | Monmouth | 4 hr |
Nearby
Severe Thunderstorm Warnings in New Jersey, 2025Every severe thunderstorm warning in 2025
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.