Alert archive / New Jersey / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 304, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Sep 13, 2021, 9:53 PM EDT for 4 counties in New Jersey. It was in force for 52 min. 13 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, 9:53 PM EDT (01:53 UTC)
- Expired
- Sep 13, 2021, 10:45 PM EDT
- In force
- 52 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Hail
- 0.88 in
- Wind
- 60.0 mph
Counties Mercer County, NJ, Middlesex County, NJ, Monmouth County, NJ, Somerset County, NJ
The radar
The Philadelphia radar (KDIX), 55 km from the middle of the area, began a volume at 01:53 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, 9:53 PM EDT | TSTM WND DMG | 1 S New Brunswick, NJ | JONES AVE BETWEEN SEAMAN ST AND HANDY ST CLOSED DUE TO A LARGE TREE DOWN BLOCKING THE ROADWAY. TIME ESTIMATED FROM RADAR. |
| Sep 13, 10:02 PM EDT | TSTM WND DMG | 1 Se Milltown, NJ | SEVERAL LARGE TREE LIMBS SNAPPED ALONG A CONCENTRATED PATH ALONG RYDERS LANE IN EAST BRUNSWICK. TIME ESTIMATED FROM RADAR. |
| Sep 13, 10:02 PM EDT | TSTM WND DMG | 2 E Jamesburg, NJ | NORTH STATE HOME ROAD CLOSED BETWEEN SPOTSWOOD ENGLISHTOWN ROAD AND SPOTSWOOD GRAVEL HILL ROAD DUE TO TREES AND WIRES IN THE ROADWAY.TIME ESTIMATED FROM RADAR. |
| Sep 13, 10:02 PM EDT | TSTM WND DMG | Concordia, NJ | UNION VALLEY HALF ACRE ROAD CLOSED BETWEEN UNION VALLEY ROAD AND CRANBURY HALF ACRE ROAD DUE TO TREES AND WIRES IN THE ROADWAY. TIME ESTIMATED FROM RADAR. CORRECTED TIME. |
| Sep 13, 10:10 PM EDT | TSTM WND DMG | Union Beach, NJ | DOWNED POLE ON NJ36 NORTHBOUND AT STONE ROAD, ALL LANES CLOSED. TIME ESTIMATED FROM RADAR. |
| Sep 13, 10:10 PM EDT | HAIL 0.5 | 1 S Jamesburg, NJ | MONROE TOWNSHIP. |
| Sep 13, 10:14 PM EDT | TSTM WND DMG | 1 Ene Navesink, NJ | DOWNED TREE ON NJ36 SOUTHBOUND IN MIDDLETOWN TOWNSHIP. TIME ESTIMATED FROM RADAR. |
| Sep 13, 10:14 PM EDT | HAIL 0.5 | 1 Ese Keansburg, NJ | REPORT FROM MPING OF HALF-INCH HAIL. |
| Sep 13, 10:15 PM EDT | TSTM WND DMG | Atlantic Highlands, NJ | TREE LIMBS DOWN ALONG NJ ROUTE 36. |
| Sep 13, 10:15 PM EDT | TSTM WND GST 67 | Port Monmouth, NJ | 67 MPH WIND GUST AT PORT MONMOUTH CWOP SITE. |
| Sep 13, 10:19 PM EDT | TSTM WND GST 61 | Keansburg, NJ | 61MPH GUST AT WXFLOW SITE IN KEANSBURG. |
| Sep 13, 10:22 PM EDT | TSTM WND DMG | 1 Ssw Colts Neck, NJ | REPORT FROM MPING: 3-INCH TREE LIMBS BROKEN; POWER POLES BROKEN. TIME ESTIMATED FROM RADAR. |
| Sep 13, 10:24 PM EDT | TSTM WND GST 61 | Sandy Hook, NJ | MEASURED AT SANDY HOOK SITE. |
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, 1.9 hours before the alert went out and 122 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.
477
WUUS51 KPHI 140153
SVRPHI
NJC021-023-025-035-140245-
/O.NEW.KPHI.SV.W.0304.210914T0153Z-210914T0245Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
953 PM EDT Mon Sep 13 2021
The National Weather Service in Mount Holly NJ has issued a
* Severe Thunderstorm Warning for...
Northern Mercer County in central New Jersey...
Southeastern Somerset County in northern New Jersey...
Monmouth County in central New Jersey...
Middlesex County in northern New Jersey...
* Until 1045 PM EDT.
* At 952 PM EDT, severe thunderstorms were located along a line
extending from Carteret to Hopewell, moving east at 60 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, Long Branch, Asbury Park, Sandy Hook, Somerset,
Middletown, Old Bridge, East Brunswick, South Brunswick,
Sayreville, North Brunswick, Marlboro, Manalapan, Tinton Falls,
Holmdel, Princeton, Red Bank, Keansburg, Matawan and Jamesburg.
This includes the following highways...
New Jersey Turnpike between exits 9 and 10.
Garden State Parkway between mile markers 100 and 126.
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 these storms. Move indoors immediately.
Remember, if you can hear thunder, you are close enough to be struck
by lightning.
&&
LAT...LON 4017 7397 4034 7488 4049 7458 4050 7426
4049 7428 4046 7426 4044 7420 4046 7418
4045 7413 4041 7400 4041 7399 4048 7402
4048 7401 4043 7397
TIME...MOT...LOC 0152Z 286DEG 50KT 4058 7423 4037 7476
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.88 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
Gorse3 follow-up statements
793
WWUS51 KPHI 140206
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
1006 PM EDT Mon Sep 13 2021
NJC035-140216-
/O.CAN.KPHI.SV.W.0304.000000T0000Z-210914T0245Z/
Somerset NJ-
1006 PM EDT Mon Sep 13 2021
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN SOMERSET COUNTY
IS CANCELLED...
The storms which prompted the warning have moved out of the warned
area. Therefore, the warning has been cancelled.
LAT...LON 4017 7397 4030 7467 4044 7454 4049 7447
4050 7428 4046 7426 4044 7420 4046 7418
4045 7413 4041 7403 4041 7398 4047 7401
4048 7401 4043 7397
TIME...MOT...LOC 0206Z 286DEG 50KT 4054 7404 4033 7457
$$
NJC021-023-025-140245-
/O.CON.KPHI.SV.W.0304.000000T0000Z-210914T0245Z/
Mercer NJ-Monmouth NJ-Middlesex NJ-
1006 PM EDT Mon Sep 13 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1045 PM EDT
FOR EAST CENTRAL MERCER...NORTHEASTERN MONMOUTH AND MIDDLESEX
COUNTIES...
At 1006 PM EDT, severe thunderstorms were located along a line
extending from near Oakwood to Princeton Meadows, moving east at 60
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, Long Branch, Asbury Park, Sandy Hook, Somerset,
Middletown, Old Bridge, East Brunswick, South Brunswick, Sayreville,
North Brunswick, Marlboro, Manalapan, Tinton Falls, Holmdel, Red
Bank, Keansburg, Matawan, Jamesburg and Hightstown.
This includes the following highways...
New Jersey Turnpike between exits 9 and 10.
Garden State Parkway between mile markers 100 and 126.
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 these storms.
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 4017 7397 4030 7467 4044 7454 4049 7447
4050 7428 4046 7426 4044 7420 4046 7418
4045 7413 4041 7403 4041 7398 4047 7401
4048 7401 4043 7397
TIME...MOT...LOC 0206Z 286DEG 50KT 4054 7404 4033 7457
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.88 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
Gorse137
WWUS51 KPHI 140224
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
1024 PM EDT Mon Sep 13 2021
NJC021-023-140234-
/O.CAN.KPHI.SV.W.0304.000000T0000Z-210914T0245Z/
Mercer NJ-Middlesex NJ-
1024 PM EDT Mon Sep 13 2021
...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL MERCER AND
MIDDLESEX COUNTIES IS CANCELLED...
The storms which prompted the warning have moved out of the warned
area. Therefore, the warning has been cancelled.
LAT...LON 4017 7397 4024 7434 4045 7413 4041 7403
4041 7398 4046 7401 4047 7400 4043 7397
TIME...MOT...LOC 0224Z 289DEG 48KT 4044 7389 4026 7413 4023 7428
$$
NJC025-140245-
/O.CON.KPHI.SV.W.0304.000000T0000Z-210914T0245Z/
Monmouth NJ-
1024 PM EDT Mon Sep 13 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1045 PM EDT
FOR NORTHEASTERN MONMOUTH COUNTY...
At 1024 PM EDT, severe thunderstorms were located along a line
extending from near Sandy Hook to Tinton Falls to West Freehold,
moving east at 55 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...
Long Branch, Asbury Park, Sandy Hook, Middletown, Marlboro, Tinton
Falls, Holmdel, Red Bank, Keansburg, Highlands, East Freehold, West
Freehold, Elberon, Navesink, Collingwood Park, Lincroft, Eatontown,
Freehold, West Long Branch and Rumson.
This includes Garden State Parkway between mile markers 100 and 116.
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 these storms.
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 4017 7397 4024 7434 4045 7413 4041 7403
4041 7398 4046 7401 4047 7400 4043 7397
TIME...MOT...LOC 0224Z 289DEG 48KT 4044 7389 4026 7413 4023 7428
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
Gorse617
WWUS51 KPHI 140237
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
1037 PM EDT Mon Sep 13 2021
NJC025-140246-
/O.EXP.KPHI.SV.W.0304.000000T0000Z-210914T0245Z/
Monmouth NJ-
1037 PM EDT Mon Sep 13 2021
...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN MONMOUTH COUNTY
WILL EXPIRE AT 1045 PM EDT...
The storms which prompted the warning continue to move out of the
area. Therefore, the warning will be allowed to expire.
LAT...LON 4017 7397 4024 7434 4045 7413 4041 7403
4041 7398 4046 7401 4047 7400 4043 7397
TIME...MOT...LOC 0236Z 286DEG 50KT 4040 7372 4022 7396 4019 7411
$$
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, 9:34 PM EDT | Severe Thunderstorm Warning | PHI | Middlesex, Morris, Somerset | 38 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.