Alert archive / New Jersey / Severe Thunderstorm Warnings in 2026
Severe Thunderstorm Warning 249, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 28, 2026, 2:56 PM EDT for 4 counties in New Jersey. It was in force for 49 min. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Jul 28, 2026, 2:56 PM EDT (18:56 UTC)
- Expired
- Jul 28, 2026, 3:45 PM EDT
- In force
- 49 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties Hunterdon County, NJ, Morris County, NJ, Somerset County, NJ, Sussex County, NJ
The radar
The Philadelphia radar (KDIX), 110 km from the middle of the area, began a volume at 18:59 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 watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Jul 28, 12:51 PM EDT | Severe Thunderstorm Watch | SPC | 8 hr |
The nearest sounding before it
Brookhaven, NY (KOKX), launched 12:00Z, 6.9 hours before the alert went out and 134 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
- 1266 J/kg
- Mixed-layer CIN
- -16 J/kg
- Mixed-layer LCL
- 637 m above ground
- 0-6 km bulk shear
- 12 kt
- 0-1 km storm-relative helicity
- 41 m²/s²
- 0-3 km storm-relative helicity
- 63 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
183
WUUS51 KPHI 281856
SVRPHI
NJC019-027-035-037-281945-
/O.NEW.KPHI.SV.W.0249.260728T1856Z-260728T1945Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
256 PM EDT Tue Jul 28 2026
The National Weather Service in Mount Holly NJ has issued a
* Severe Thunderstorm Warning for...
Northeastern Hunterdon County in northwestern New Jersey...
Morris County in northern New Jersey...
South central Sussex County in northwestern New Jersey...
Northern Somerset County in northern New Jersey...
* Until 345 PM EDT.
* At 256 PM EDT, a severe thunderstorm was located near Califon, or
11 miles northwest of Somerville, moving northeast at 30 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Damage to roofs, siding, trees, and power lines is
possible.
* Locations impacted include...
Morristown, Somerville, Bridgewater, Dover, Madison, Hopatcong,
East Hanover, Lincoln Park, Bound Brook, Manville, Kinnelon,
Hackettstown, Boonton, Butler, Wharton, Rockaway, Morris Plains,
Mount Arlington, Mendham, and Mountain Lakes.
This includes the following highways...
Interstate 78 in New Jersey between mile markers 14 and 39.
Interstate 80 in New Jersey between mile markers 23 and 48.
Interstate 287 in New Jersey between mile markers 13 and 52.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 4092 7429 4091 7434 4087 7433 4049 7460
4060 7499 4108 7465 4107 7449 4104 7450
4105 7445 4102 7443 4103 7442 4102 7440
4101 7436 4097 7428
TIME...MOT...LOC 1856Z 218DEG 27KT 4069 7476
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
Guzzo3 follow-up statements
331
WWUS51 KPHI 281918
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
318 PM EDT Tue Jul 28 2026
NJC019-027-035-037-281945-
/O.CON.KPHI.SV.W.0249.000000T0000Z-260728T1945Z/
Hunterdon NJ-Morris NJ-Sussex NJ-Somerset NJ-
318 PM EDT Tue Jul 28 2026
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 345 PM EDT
FOR NORTHEASTERN HUNTERDON...MORRIS...SOUTH CENTRAL SUSSEX AND
NORTHERN SOMERSET COUNTIES...
At 318 PM EDT, a severe thunderstorm was located over Mendham, or
near Morristown, moving northeast at 30 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Damage to roofs, siding, trees, and power lines is
possible.
Locations impacted include...
Morristown, Dover, Madison, Hopatcong, East Hanover, Lincoln Park,
Kinnelon, Hackettstown, Boonton, Butler, Wharton, Rockaway, Morris
Plains, Mount Arlington, Mendham, Mountain Lakes, Stanhope, Netcong,
Peapack And Gladstone, and Ogdensburg.
This includes the following highways...
Interstate 78 in New Jersey between mile markers 27 and 39.
Interstate 80 in New Jersey between mile markers 23 and 48.
Interstate 287 in New Jersey between mile markers 20 and 52.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 4092 7429 4091 7434 4087 7433 4059 7453
4070 7492 4108 7465 4107 7449 4104 7450
4105 7445 4102 7443 4103 7442 4102 7440
4101 7436 4097 7428
TIME...MOT...LOC 1918Z 228DEG 26KT 4079 7459
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
Guzzo735
WWUS51 KPHI 281931
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
331 PM EDT Tue Jul 28 2026
NJC037-281941-
/O.CAN.KPHI.SV.W.0249.000000T0000Z-260728T1945Z/
Sussex NJ-
331 PM EDT Tue Jul 28 2026
...THE SEVERE THUNDERSTORM WARNING FOR SOUTH CENTRAL SUSSEX 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 800 PM EDT for
northern and northwestern New Jersey.
LAT...LON 4092 7429 4091 7434 4087 7433 4066 7448
4071 7480 4105 7453 4107 7449 4104 7450
4105 7445 4102 7443 4103 7442 4102 7440
4101 7436 4097 7428
TIME...MOT...LOC 1931Z 218DEG 27KT 4087 7451
$$
NJC019-027-035-281945-
/O.CON.KPHI.SV.W.0249.000000T0000Z-260728T1945Z/
Hunterdon NJ-Morris NJ-Somerset NJ-
331 PM EDT Tue Jul 28 2026
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 345 PM EDT
FOR NORTHEASTERN HUNTERDON...MORRIS AND NORTHEASTERN SOMERSET
COUNTIES...
At 331 PM EDT, a severe thunderstorm was located over Victory
Gardens, or near Morristown, moving northeast at 30 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Damage to roofs, siding, trees, and power lines is
possible.
Locations impacted include...
Morristown, Dover, Madison, East Hanover, Lincoln Park, Kinnelon,
Boonton, Butler, Wharton, Rockaway, Morris Plains, Mount Arlington,
Mendham, Mountain Lakes, Peapack And Gladstone, Chester, Victory
Gardens, Far Hills, Green Pond, and Millington.
This includes the following highways...
Interstate 80 in New Jersey between mile markers 30 and 48.
Interstate 287 in New Jersey between mile markers 26 and 52.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 4092 7429 4091 7434 4087 7433 4066 7448
4071 7480 4105 7453 4107 7449 4104 7450
4105 7445 4102 7443 4103 7442 4102 7440
4101 7436 4097 7428
TIME...MOT...LOC 1931Z 218DEG 27KT 4087 7451
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
Guzzo012
WWUS51 KPHI 281941
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
341 PM EDT Tue Jul 28 2026
NJC019-027-035-281951-
/O.EXP.KPHI.SV.W.0249.000000T0000Z-260728T1945Z/
Hunterdon NJ-Morris NJ-Somerset NJ-
341 PM EDT Tue Jul 28 2026
...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN HUNTERDON...
MORRIS AND NORTHEASTERN SOMERSET COUNTIES WILL EXPIRE AT 345 PM
EDT...
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning will be allowed to expire.
A Severe Thunderstorm Watch remains in effect until 800 PM EDT for
northern and northwestern New Jersey.
LAT...LON 4092 7429 4091 7434 4087 7433 4066 7448
4071 7480 4105 7453 4107 7449 4104 7450
4105 7445 4102 7443 4103 7442 4102 7440
4101 7436 4097 7428
TIME...MOT...LOC 1941Z 218DEG 27KT 4092 7446
$$
GuzzoThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 28, 1:22 PM EDT | Severe Thunderstorm Warning | PHI | Warren | 38 min |
| Jul 28, 1:31 PM EDT | Severe Thunderstorm Warning | PHI | Hunterdon, Mercer, Middlesex, Morris, Somerset, Warren | 44 min |
| Jul 28, 1:49 PM EDT | Tornado Warning | PHI | Sussex, Warren | 26 min |
| Jul 28, 2:04 PM EDT | Flash Flood Warning | PHI | Warren | 10 hr |
| Jul 28, 2:11 PM EDT | Flash Flood Warning | PHI | Hunterdon, Mercer, Somerset | 4 hr |
| Jul 28, 2:15 PM EDT | Severe Thunderstorm Warning | PHI | Hunterdon, Morris, Sussex, Warren | 45 min |
| Jul 28, 2:45 PM EDT | Flash Flood Warning | PHI | Hunterdon, Morris, Warren | 9 hr |
| Jul 28, 3:04 PM EDT | Severe Thunderstorm Warning | PHI | Middlesex, Monmouth | 41 min |
| Jul 28, 3:43 PM EDT | Severe Thunderstorm Warning | PHI | Hunterdon, Morris, Sussex, Warren | 23 min |
| Jul 28, 4:02 PM EDT | Flash Flood Warning | PHI | Middlesex | 2 hr |
| Jul 28, 5:22 PM EDT | Severe Thunderstorm Warning | PHI | Hunterdon | 34 min |
| Jul 28, 5:47 PM EDT | Severe Thunderstorm Warning | PHI | Hunterdon, Warren | 43 min |
| Jul 28, 6:10 PM EDT | Special Marine Warning | PHI | 2 hr | |
| Jul 28, 6:16 PM EDT | Severe Thunderstorm Warning | PHI | Hunterdon, Morris, Somerset | 25 min |
| Jul 28, 6:17 PM EDT | Flash Flood Warning | PHI | Hunterdon, Warren | 6 hr |
| Jul 28, 6:23 PM EDT | Severe Thunderstorm Warning | PHI | Gloucester, Salem | 67 min |
| Jul 28, 6:46 PM EDT | Tornado Warning | PHI | Gloucester, Salem | 29 min |
| Jul 28, 6:55 PM EDT | Severe Thunderstorm Warning | PHI | Cumberland, Gloucester, Salem | 50 min |
| Jul 28, 7:06 PM EDT | Severe Thunderstorm Warning | PHI | Burlington, Camden, Cumberland, Gloucester, Salem | 54 min |
| Jul 28, 7:11 PM EDT | Flash Flood Warning | PHI | Camden, Gloucester, Salem | 3 hr |
| Jul 28, 7:23 PM EDT | Special Marine Warning | PHI | 2 hr | |
| Jul 28, 7:37 PM EDT | Severe Thunderstorm Warning | PHI | Atlantic, Cape May, Cumberland, Salem | 23 min |
| Jul 28, 7:55 PM EDT | Flash Flood Warning | PHI | Hunterdon | 4 hr |
Nearby
Severe Thunderstorm Warnings in New Jersey, 2026Every severe thunderstorm warning in 2026
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.