Alert archive / New Jersey / Severe Thunderstorm Warnings in 2023
Severe Thunderstorm Warning 338, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Sep 8, 2023, 4:50 PM EDT for 5 counties in New Jersey. It was in force for 40 min. 7 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 8, 2023, 4:50 PM EDT (20:50 UTC)
- Expired
- Sep 8, 2023, 5:30 PM EDT
- In force
- 40 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Hail
- 0.88 in
- Wind
- 60.0 mph
Counties Hunterdon County, NJ, Morris County, NJ, Somerset County, NJ, Sussex County, NJ, Warren County, NJ
The radar
The Philadelphia radar (KDIX), 84 km from the middle of the area, began a volume at 20:52 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 8, 5:01 PM EDT | HAIL 0.75 | Long Valley, NJ | Report on social media of penny-sized hail. |
| Sep 8, 5:02 PM EDT | HAIL 0.5 | 1 Nw Long Valley, NJ | Report from mPING: Half-inch (0.50 in.). |
| Sep 8, 5:05 PM EDT | HAIL 1.25 | Long Valley, NJ | Photos from trained spotter showed hail as large as half dollar size in Long Valley. Hail fell for 5 minutes. |
| Sep 8, 5:06 PM EDT | TSTM WND DMG | 1 Se Hackettstown, NJ | Downed tree on US 46 westbound East of CR 604/NJ 182/Willow Grove St (Mount Olive Twp) All lanes closed. Time estimated from radar. |
| Sep 8, 5:07 PM EDT | HAIL 1 | 1 Nw Long Valley, NJ | Report from mPING: Quarter (1.00 in.). |
| Sep 8, 5:20 PM EDT | TSTM WND DMG | Byram Twp, NJ | Reports of trees and power lines down in Byram Twp. Time estimated from radar. |
| Sep 8, 5:20 PM EDT | TSTM WND DMG | Green Twp, NJ | Reports of trees and power lines down in Green Twp. 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 8, 3:11 PM EDT | Severe Thunderstorm Watch | SPC | 8 hr |
The nearest sounding before it
Brookhaven, NY (KOKX), launched 12:00Z, 8.8 hours before the alert went out and 166 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
- 2469 J/kg
- Mixed-layer CIN
- -23 J/kg
- Mixed-layer LCL
- 566 m above ground
- 0-6 km bulk shear
- 33 kt
- 0-1 km storm-relative helicity
- 92 m²/s²
- 0-3 km storm-relative helicity
- 87 m²/s²
- Significant tornado parameter
- 0.7
- Supercell composite
- 4.0
The text
As transmitted.
436
WUUS51 KPHI 082050
SVRPHI
NJC019-027-035-037-041-082130-
/O.NEW.KPHI.SV.W.0338.230908T2050Z-230908T2130Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
450 PM EDT Fri Sep 8 2023
The National Weather Service in Mount Holly NJ has issued a
* Severe Thunderstorm Warning for...
Hunterdon County in northwestern New Jersey...
Southwestern Morris County in northern New Jersey...
South central Sussex County in northwestern New Jersey...
Southeastern Warren County in northwestern New Jersey...
Northwestern Somerset County in northern New Jersey...
* Until 530 PM EDT.
* At 450 PM EDT, a severe thunderstorm was located over Califon, or
15 miles northwest of Somerville, moving northeast at 20 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...
Morristown, Bridgewater, Dover, Hopatcong, Hackettstown, Wharton,
Morris Plains, Mount Arlington, Mendham, Flemington, High Bridge,
Stanhope, Netcong, Clinton, Peapack And Gladstone, Glen Gardner,
Chester, Victory Gardens, Hampton and Lebanon.
This includes the following highways...
Interstate 78 in New Jersey between mile markers 11 and 33.
Interstate 80 in New Jersey between mile markers 18 and 32.
Interstate 287 in New Jersey between mile markers 20 and 39.
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 4041 7487 4057 7508 4100 7481 4081 7441
TIME...MOT...LOC 2050Z 216DEG 19KT 4074 7481
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.88 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
MLB2 follow-up statements
417
WWUS51 KPHI 082103
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
503 PM EDT Fri Sep 8 2023
NJC019-027-035-037-041-082130-
/O.CON.KPHI.SV.W.0338.000000T0000Z-230908T2130Z/
Hunterdon NJ-Morris NJ-Sussex NJ-Warren NJ-Somerset NJ-
503 PM EDT Fri Sep 8 2023
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 530 PM EDT
FOR HUNTERDON...SOUTHWESTERN MORRIS...SOUTH CENTRAL SUSSEX...
SOUTHEASTERN WARREN AND NORTHWESTERN SOMERSET COUNTIES...
At 503 PM EDT, a severe thunderstorm was located over Long Valley, or
14 miles west of Morristown, moving northeast at 20 mph.
HAZARD...60 mph wind gusts and nickel size hail.
SOURCE...Radar indicated.
IMPACT...Damage to roofs, siding, trees, and power lines is
possible.
Locations impacted include...
Morristown, Bridgewater, Dover, Hopatcong, Hackettstown, Wharton,
Morris Plains, Mount Arlington, Mendham, Flemington, High Bridge,
Stanhope, Netcong, Clinton, Peapack And Gladstone, Glen Gardner,
Chester, Victory Gardens, Hampton and Lebanon.
This includes the following highways...
Interstate 78 in New Jersey between mile markers 11 and 33.
Interstate 80 in New Jersey between mile markers 18 and 32.
Interstate 287 in New Jersey between mile markers 20 and 39.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Frequent cloud to ground lightning is occurring with this storm. Move
indoors immediately. Lightning is one of nature's leading killers.
Remember, if you can hear thunder, you are close enough to be struck
by lightning.
Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 4041 7487 4057 7508 4100 7481 4081 7441
TIME...MOT...LOC 2103Z 216DEG 19KT 4080 7476
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.88 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
MLB380
WWUS51 KPHI 082128
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
528 PM EDT Fri Sep 8 2023
NJC019-027-035-037-041-082137-
/O.EXP.KPHI.SV.W.0338.000000T0000Z-230908T2130Z/
Hunterdon NJ-Morris NJ-Sussex NJ-Warren NJ-Somerset NJ-
528 PM EDT Fri Sep 8 2023
...THE SEVERE THUNDERSTORM WARNING FOR HUNTERDON...SOUTHWESTERN
MORRIS...SOUTH CENTRAL SUSSEX...SOUTHEASTERN WARREN AND NORTHWESTERN
SOMERSET COUNTIES WILL EXPIRE AT 530 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. However gusty
winds and heavy rain are still possible with this thunderstorm.
A Severe Thunderstorm Watch remains in effect until 1100 PM EDT for
northern and northwestern New Jersey.
To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
Mount Holly NJ.
Remember, a Severe Thunderstorm Warning still remains in effect for
Southwestern Hunterdon County until 6:00 PM EDT.
LAT...LON 4041 7487 4057 7508 4100 7481 4081 7441
TIME...MOT...LOC 2127Z 216DEG 19KT 4089 7467
$$
MLBThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 7, 9:46 PM EDT | Special Weather Statement | PHI | Sussex | 29 min |
| Sep 8, 6:02 AM EDT | Special Marine Warning | PHI | 40 min | |
| Sep 8, 1:36 PM EDT | Special Weather Statement | PHI | Burlington | 24 min |
| Sep 8, 1:37 PM EDT | Special Weather Statement | PHI | Monmouth | 23 min |
| Sep 8, 1:46 PM EDT | Severe Thunderstorm Warning | PHI | Burlington, Ocean | 44 min |
| Sep 8, 1:50 PM EDT | Special Marine Warning | PHI | 115 min | |
| Sep 8, 1:54 PM EDT | Severe Thunderstorm Warning | PHI | Monmouth, Ocean | 51 min |
| Sep 8, 2:27 PM EDT | Severe Thunderstorm Warning | PHI | Middlesex, Monmouth | 48 min |
| Sep 8, 2:30 PM EDT | Severe Thunderstorm Warning | PHI | Burlington, Middlesex, Monmouth, Ocean | 45 min |
| Sep 8, 2:33 PM EDT | Areal Flood Advisory | PHI | Burlington, Monmouth, Ocean | 3 hr |
| Sep 8, 2:44 PM EDT | Special Marine Warning | PHI | 18 min | |
| Sep 8, 2:45 PM EDT | Severe Thunderstorm Warning | PHI | Burlington, Ocean | 45 min |
| Sep 8, 2:53 PM EDT | Severe Thunderstorm Warning | PHI | Burlington, Mercer, Middlesex, Monmouth, Somerset | 52 min |
| Sep 8, 3:17 PM EDT | Special Marine Warning | PHI | 58 min | |
| Sep 8, 3:27 PM EDT | Severe Thunderstorm Warning | PHI | Burlington, Mercer, Monmouth, Ocean | 63 min |
| Sep 8, 3:29 PM EDT | Flash Flood Warning | PHI | Burlington, Ocean | 4 hr |
| Sep 8, 3:31 PM EDT | Severe Thunderstorm Warning | PHI | Cumberland, Salem | 44 min |
| Sep 8, 3:36 PM EDT | Severe Thunderstorm Warning | PHI | Morris | 30 min |
| Sep 8, 3:43 PM EDT | Special Weather Statement | PHI | Middlesex | 32 min |
| Sep 8, 3:58 PM EDT | Special Weather Statement | PHI | Somerset | 32 min |
| Sep 8, 4:24 PM EDT | Severe Thunderstorm Warning | PHI | Hunterdon | 51 min |
| Sep 8, 4:27 PM EDT | Severe Thunderstorm Warning | PHI | Burlington, Ocean | 51 min |
| Sep 8, 4:30 PM EDT | Severe Thunderstorm Warning | PHI | Burlington, Mercer, Monmouth, Ocean | 60 min |
| Sep 8, 5:12 PM EDT | Areal Flood Advisory | PHI | Hunterdon | 3 hr |
| Sep 8, 5:14 PM EDT | Severe Thunderstorm Warning | PHI | Hunterdon | 46 min |
| Sep 8, 5:21 PM EDT | Flash Flood Warning | PHI | Hunterdon | 4 hr |
| Sep 8, 5:34 PM EDT | Severe Thunderstorm Warning | PHI | Warren | 41 min |
| Sep 8, 5:49 PM EDT | Severe Thunderstorm Warning | PHI | Sussex | 41 min |
| Sep 8, 6:11 PM EDT | Special Weather Statement | PHI | Warren | 34 min |
| Sep 8, 6:34 PM EDT | Areal Flood Advisory | PHI | Sussex, Warren | 3 hr |
Nearby
Severe Thunderstorm Warnings in New Jersey, 2023Every severe thunderstorm warning in 2023
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.