Alert archive / New Jersey / Severe Thunderstorm Warnings in 2026
Severe Thunderstorm Warning 305, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Aug 11, 2026, 5:21 PM EDT for Sussex County, New Jersey. It was in force for 20 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
- Aug 11, 2026, 5:21 PM EDT (21:21 UTC)
- Expired
- Aug 11, 2026, 5:41 PM EDT
- In force
- 20 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
County Sussex County, NJ
The radar
The Philadelphia radar (KDIX), 142 km from the middle of the area, began a volume at 21:22 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 nearest sounding before it
Brookhaven, NY (KOKX), launched 12:00Z, 9.4 hours before the alert went out and 142 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
- 551 J/kg
- Mixed-layer CIN
- -117 J/kg
- Mixed-layer LCL
- 1095 m above ground
- 0-6 km bulk shear
- 34 kt
- 0-1 km storm-relative helicity
- -18 m²/s²
- 0-3 km storm-relative helicity
- 86 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.4
The text
As transmitted.
097
WUUS51 KPHI 112121
SVRPHI
NJC037-112200-
/O.NEW.KPHI.SV.W.0305.260811T2121Z-260811T2200Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
521 PM EDT Tue Aug 11 2026
The National Weather Service in Mount Holly NJ has issued a
* Severe Thunderstorm Warning for...
Northeastern Sussex County in northwestern New Jersey...
* Until 600 PM EDT.
* At 521 PM EDT, a severe thunderstorm was located over Highland
Lake, or 7 miles northwest of West Milford, moving southeast at 15
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...
Sussex, Highland Lake, and Vernon Valley.
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 4128 7453 4120 7436 4117 7441 4110 7448
4121 7461 4129 7454
TIME...MOT...LOC 2121Z 298DEG 14KT 4119 7447
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
Gorse2 follow-up statements
902
WWUS51 KPHI 112130
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
530 PM EDT Tue Aug 11 2026
NJC037-112200-
/O.CON.KPHI.SV.W.0305.000000T0000Z-260811T2200Z/
Sussex NJ-
530 PM EDT Tue Aug 11 2026
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 600 PM EDT
FOR EAST CENTRAL SUSSEX COUNTY...
At 530 PM EDT, a severe thunderstorm was located over Highland Lake,
or near West Milford, moving southeast at 15 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Damage to roofs, siding, trees, and power lines is
possible.
Locations impacted include...
Highland Lake and Vernon Valley.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Frequent cloud to ground lightning is occurring with this storm. Move
indoors immediately. Lightning is one of nature's leading killers.
Remember, if you can hear thunder, you are close enough to be struck
by lightning.
&&
LAT...LON 4120 7436 4117 7441 4112 7446 4121 7457
4126 7448
TIME...MOT...LOC 2130Z 298DEG 14KT 4117 7443
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
Gorse455
WWUS51 KPHI 112141
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
541 PM EDT Tue Aug 11 2026
NJC037-112151-
/O.CAN.KPHI.SV.W.0305.000000T0000Z-260811T2200Z/
Sussex NJ-
541 PM EDT Tue Aug 11 2026
...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL SUSSEX COUNTY IS
CANCELLED...
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 has been cancelled. However gusty winds and
heavy rain are still possible with this thunderstorm.
LAT...LON 4120 7436 4117 7441 4112 7446 4121 7457
4126 7448
TIME...MOT...LOC 2138Z 298DEG 14KT 4115 7438
$$
GorseThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 11, 3:23 AM EDT | Coastal Flood Advisory | PHI | Cape May, Cumberland, Salem | 23 hr |
| Aug 11, 4:48 PM EDT | Severe Thunderstorm Warning | PHI | Sussex, Warren | 43 min |
| Aug 11, 4:56 PM EDT | Coastal Flood Advisory | PHI | Cape May, Cumberland, Salem | 33 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.