Alert archive / New Jersey / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 303, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Sep 13, 2021, 9:34 PM EDT for Middlesex County, Morris County, Somerset County, New Jersey. It was in force for 38 min. 4 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 13, 2021, 9:34 PM EDT (01:34 UTC)
- Expired
- Sep 13, 2021, 10:12 PM EDT
- In force
- 38 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Hail
- 0.88 in
- Wind
- 60.0 mph
Counties Middlesex County, NJ, Morris County, NJ, Somerset County, NJ
The radar
The Philadelphia radar (KDIX), 72 km from the middle of the area, began a volume at 01:36 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Sep 13, 9:54 PM EDT | TSTM WND DMG | 1 Sse Edison, NJ | DOWNED WIRES ON US 1 NORTHBOUND IN EDISON TOWNSHIP NEAR OLD POST ROAD-NORTH. TIME ESTIMATED FROM RADAR. |
| Sep 13, 10:00 PM EDT | TSTM WND DMG | Hopelawn, NJ | LARGE TREE FELL THROUGH THE ROOF OF A HOUSE IN HOPELAWN. TIME ESTIMATED FROM RADAR. |
| Sep 13, 10:00 PM EDT | TSTM WND DMG | Hopelawn, NJ | TREE FELL THROUGH THE ROOF OF A HOUSE IN HOPELAWN. TIME ESTIMATED FROM RADAR. |
| Sep 13, 10:00 PM EDT | HAIL 0.5 | Perth Amboy, NJ |
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 13, 7:44 PM EDT | Severe Thunderstorm Watch | SPC | 4 hr |
The nearest sounding before it
Brookhaven, NY (KOKX), launched 00:00Z, 1.6 hours before the alert went out and 130 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
- 90 J/kg
- Mixed-layer CIN
- -236 J/kg
- Mixed-layer LCL
- 1411 m above ground
- 0-6 km bulk shear
- 56 kt
- 0-1 km storm-relative helicity
- 82 m²/s²
- 0-3 km storm-relative helicity
- 139 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
088
WUUS51 KPHI 140134
SVRPHI
NJC023-027-035-140230-
/O.NEW.KPHI.SV.W.0303.210914T0134Z-210914T0230Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
934 PM EDT Mon Sep 13 2021
The National Weather Service in Mount Holly NJ has issued a
* Severe Thunderstorm Warning for...
Southern Morris County in northern New Jersey...
Central Somerset County in northern New Jersey...
Northeastern Middlesex County in northern New Jersey...
* Until 1030 PM EDT.
* At 933 PM EDT, a severe thunderstorm was located over Martinsville,
or near Somerville, moving east at 40 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, Perth Amboy, Somerville, Somerset, Edison, Carteret,
Middlesex, Bound Brook, Manville, Millstone, Flagtown, Colonia,
Martinsville, Millington, Society Hill, Woodbridge, South
Plainfield, North Plainfield, Highland Park and Metuchen.
This includes the following highways...
New Jersey Turnpike between exits 11 and 13.
Interstate 78 in New Jersey between mile markers 34 and 42.
Interstate 287 in New Jersey between mile markers 0 and 18.
Garden State Parkway between mile markers 126 and 134.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
In addition to 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 4056 7421 4055 7425 4050 7426 4049 7428
4048 7471 4069 7457 4068 7445 4066 7445
4066 7440 4063 7442 4060 7446 4061 7431
4059 7429 4060 7426 4059 7421
TIME...MOT...LOC 0133Z 280DEG 34KT 4064 7454
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.88 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
Gorse2 follow-up statements
808
WWUS51 KPHI 140200
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
1000 PM EDT Mon Sep 13 2021
NJC027-140210-
/O.CAN.KPHI.SV.W.0303.000000T0000Z-210914T0230Z/
Morris NJ-
1000 PM EDT Mon Sep 13 2021
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHERN MORRIS COUNTY IS
CANCELLED...
The severe thunderstorm which prompted the warning has moved out of
the warned area. Therefore, the warning has been cancelled.
A Severe Thunderstorm Watch remains in effect until 100 AM EDT for
northern New Jersey.
LAT...LON 4055 7425 4050 7426 4049 7428 4050 7457
4057 7438 4061 7431 4059 7429 4060 7426
4059 7421 4056 7421
TIME...MOT...LOC 0200Z 279DEG 34KT 4053 7424
$$
NJC023-035-140230-
/O.CON.KPHI.SV.W.0303.000000T0000Z-210914T0230Z/
Somerset NJ-Middlesex NJ-
1000 PM EDT Mon Sep 13 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1030 PM EDT
FOR EAST CENTRAL SOMERSET AND NORTHEASTERN MIDDLESEX COUNTIES...
At 1000 PM EDT, a severe thunderstorm was located over Tottenville,
or over Perth Amboy, moving east at 40 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, Perth Amboy, Somerset, Edison, Carteret, Colonia,
Society Hill, Woodbridge, Highland Park, Metuchen, Iselin, Sewaren,
Port Reading, Fords and Avenel.
This includes the following highways...
New Jersey Turnpike between exits 11 and 13.
Interstate 287 in New Jersey between mile markers 0 and 4.
Garden State Parkway between mile markers 127 and 134.
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 4055 7425 4050 7426 4049 7428 4050 7457
4057 7438 4061 7431 4059 7429 4060 7426
4059 7421 4056 7421
TIME...MOT...LOC 0200Z 279DEG 34KT 4053 7424
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.88 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
Gorse091
WWUS51 KPHI 140212
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
1012 PM EDT Mon Sep 13 2021
NJC023-035-140221-
/O.CAN.KPHI.SV.W.0303.000000T0000Z-210914T0230Z/
Somerset NJ-Middlesex NJ-
1012 PM EDT Mon Sep 13 2021
...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL SOMERSET AND
NORTHEASTERN MIDDLESEX COUNTIES IS CANCELLED...
The storm which prompted the warning has moved out of the area.
Therefore, this warning has been cancelled.
Another Severe Thunderstorm Warning remains in effect for portions
of Middlesex County until 1045 PM.
LAT...LON 4055 7425 4050 7426 4049 7428 4050 7457
4057 7438 4061 7431 4059 7429 4060 7426
4059 7421 4056 7421
TIME...MOT...LOC 0207Z 280DEG 34KT 4051 7410
$$
GorseThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 13, 8:41 PM EDT | Severe Thunderstorm Warning | PHI | Hunterdon, Warren | 49 min |
| Sep 13, 9:03 PM EDT | Areal Flood Advisory | PHI | Hunterdon, Morris, Somerset, Sussex, Warren | 109 min |
| Sep 13, 9:03 PM EDT | Severe Thunderstorm Warning | PHI | Hunterdon, Morris, Somerset, Warren | 57 min |
| Sep 13, 9:12 PM EDT | Flash Flood Warning | PHI | Hunterdon, Morris, Warren | 114 min |
| Sep 13, 9:21 PM EDT | Severe Thunderstorm Warning | PHI | Hunterdon, Somerset, Warren | 38 min |
| Sep 13, 9:53 PM EDT | Severe Thunderstorm Warning | PHI | Mercer, Middlesex, Monmouth, Somerset | 52 min |
| Sep 13, 10:03 PM EDT | Special Marine Warning | PHI | 57 min |
Nearby
Severe Thunderstorm Warnings in New Jersey, 2021Every severe thunderstorm 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.