Alert archive / New Jersey / Severe Thunderstorm Warnings in 2023
Severe Thunderstorm Warning 78, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jun 17, 2023, 3:40 PM EDT for Hunterdon County, Somerset County, Warren County, New Jersey. It was in force for 31 min. 10 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
- Jun 17, 2023, 3:40 PM EDT (19:40 UTC)
- Expired
- Jun 17, 2023, 4:11 PM EDT
- In force
- 31 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Hail
- 0.88 in
- Wind
- 60.0 mph
Counties Hunterdon County, NJ, Somerset County, NJ, Warren County, NJ
The radar
The Philadelphia radar (KDIX), 90 km from the middle of the area, began a volume at 19:40 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 |
|---|---|---|---|
| Jun 17, 3:45 PM EDT | HAIL 0.88 | 2 Sse Califon, NJ | |
| Jun 17, 3:45 PM EDT | HAIL 0.88 | 2 Sse Califon, NJ | |
| Jun 17, 3:45 PM EDT | HAIL 0.88 | 2 Sse Califon, NJ | |
| Jun 17, 3:45 PM EDT | HAIL 0.88 | 2 Sse Califon, NJ | |
| Jun 17, 3:45 PM EDT | HAIL 0.88 | 2 Sse Califon, NJ | |
| Jun 17, 3:45 PM EDT | HAIL 0.88 | 2 Sse Califon, NJ | |
| Jun 17, 3:50 PM EDT | HAIL 0.25 | Clinton, NJ | time estimated from radar. |
| Jun 17, 3:50 PM EDT | HAIL 0.25 | Clinton, NJ | time estimated from radar. |
| Jun 17, 3:50 PM EDT | HAIL 0.25 | Clinton, NJ | time estimated from radar. |
| Jun 17, 3:50 PM EDT | HAIL 0.25 | Clinton, NJ | time estimated from radar. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Brookhaven, NY (KOKX), launched 12:00Z, 7.7 hours before the alert went out and 178 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
- 20 J/kg
- Mixed-layer CIN
- -28 J/kg
- Mixed-layer LCL
- 658 m above ground
- 0-6 km bulk shear
- 8 kt
- 0-1 km storm-relative helicity
- 6 m²/s²
- 0-3 km storm-relative helicity
- 24 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
852
WUUS51 KPHI 171940
SVRPHI
NJC019-035-041-172030-
/O.NEW.KPHI.SV.W.0078.230617T1940Z-230617T2030Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
340 PM EDT Sat Jun 17 2023
The National Weather Service in Mount Holly NJ has issued a
* Severe Thunderstorm Warning for...
Hunterdon County in northwestern New Jersey...
Southwestern Warren County in northwestern New Jersey...
Southwestern Somerset County in northern New Jersey...
* Until 430 PM EDT.
* At 339 PM EDT, a severe thunderstorm was located over Hampton, or
11 miles east of Easton, moving southeast at 30 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...
Somerville, Bridgewater, Bound Brook, Manville, Washington,
Flemington, High Bridge, Clinton, Harmony, Oxford, Glen Gardner,
Hampton, Lebanon, Califon, Bloomsbury, Brass Castle, Flagtown,
Pleasant Valley, Sergeantsville and Roxburg.
This includes the following highways...
Interstate 78 in New Jersey between mile markers 5 and 28.
Interstate 287 in New Jersey between mile markers 12 and 18.
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 4074 7517 4083 7502 4055 7452 4037 7490
TIME...MOT...LOC 1939Z 319DEG 26KT 4071 7500
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.88 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
Gorse2 follow-up statements
480
WWUS51 KPHI 171953
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
353 PM EDT Sat Jun 17 2023
NJC041-172001-
/O.CAN.KPHI.SV.W.0078.000000T0000Z-230617T2030Z/
Warren NJ-
353 PM EDT Sat Jun 17 2023
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN WARREN COUNTY IS
CANCELLED...
The severe thunderstorm which prompted the warning has moved out of
the warned area. Therefore, the warning has been cancelled.
LAT...LON 4037 7490 4064 7509 4070 7501 4069 7500
4077 7491 4055 7452
TIME...MOT...LOC 1951Z 317DEG 31KT 4060 7486
$$
NJC019-035-172030-
/O.CON.KPHI.SV.W.0078.000000T0000Z-230617T2030Z/
Hunterdon NJ-Somerset NJ-
353 PM EDT Sat Jun 17 2023
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 430 PM EDT
FOR HUNTERDON AND SOUTHWESTERN SOMERSET COUNTIES...
At 351 PM EDT, a severe thunderstorm was located near Lebanon, or 13
miles west of Somerville, moving southeast at 35 mph. Nickel size
hail was reported in parts of Hunterdon County.
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...
Somerville, Bridgewater, Bound Brook, Manville, Flemington, High
Bridge, Clinton, Glen Gardner, Hampton, Lebanon, Califon, Flagtown,
Sergeantsville, Cloverhill, Annandale, White House Station, Sand
Brook, Raritan and South Bound Brook.
This includes the following highways...
Interstate 78 in New Jersey between mile markers 8 and 28.
Interstate 287 in New Jersey between mile markers 12 and 19.
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 4037 7490 4064 7509 4070 7501 4069 7500
4077 7491 4055 7452
TIME...MOT...LOC 1951Z 317DEG 31KT 4060 7486
HAIL THREAT...OBSERVED
MAX HAIL SIZE...0.88 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
Gorse956
WWUS51 KPHI 172011
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
411 PM EDT Sat Jun 17 2023
NJC019-035-172020-
/O.CAN.KPHI.SV.W.0078.000000T0000Z-230617T2030Z/
Hunterdon NJ-Somerset NJ-
411 PM EDT Sat Jun 17 2023
...THE SEVERE THUNDERSTORM WARNING FOR HUNTERDON AND SOUTHWESTERN
SOMERSET COUNTIES IS CANCELLED...
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning has been cancelled. However small hail and
gusty winds are still possible with this thunderstorm.
LAT...LON 4037 7490 4064 7509 4070 7501 4069 7500
4077 7491 4055 7452
TIME...MOT...LOC 2008Z 319DEG 26KT 4049 7474
$$
GorseThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 17, 4:19 PM EDT | Severe Thunderstorm Warning | PHI | Middlesex, Monmouth, Somerset | 22 min |
| Jun 17, 4:55 PM EDT | Special Marine Warning | PHI | 50 min |
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.