Alert archive / New Jersey / Severe Thunderstorm Warnings in 2020
Severe Thunderstorm Warning 307, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Nov 30, 2020, 5:29 PM EST for Mercer County, Middlesex County, Somerset County, New Jersey. It was in force for 46 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
- Nov 30, 2020, 5:29 PM EST (22:29 UTC)
- Expired
- Nov 30, 2020, 6:15 PM EST
- In force
- 46 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Tornado
- Possible
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties Mercer County, NJ, Middlesex County, NJ, Somerset County, NJ
The radar
The Philadelphia radar (KDIX), 65 km from the middle of the area, began a volume at 22:30 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 |
|---|---|---|---|
| Nov 30, 1:07 PM EST | Tornado Watch | SPC | 6 hr |
The nearest sounding before it
Brookhaven, NY (KOKX), launched 12:00Z, 10.5 hours before the alert went out and 149 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
- 1 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 958 m above ground
- 0-6 km bulk shear
- 58 kt
- 0-1 km storm-relative helicity
- 306 m²/s²
- 0-3 km storm-relative helicity
- 408 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
882
WUUS51 KPHI 302229
SVRPHI
NJC021-023-035-302315-
/O.NEW.KPHI.SV.W.0307.201130T2229Z-201130T2315Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
529 PM EST Mon Nov 30 2020
The National Weather Service in Mount Holly NJ has issued a
* Severe Thunderstorm Warning for...
Central Mercer County in central New Jersey...
Somerset County in northern New Jersey...
Northwestern Middlesex County in northern New Jersey...
* Until 615 PM EST.
* At 529 PM EST, a severe thunderstorm was located over
Lawrenceville, or near Trenton, moving northeast at 50 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Damage to roofs, siding, trees, and power lines is
possible.
* Locations impacted include...
Trenton, New Brunswick, Somerville, Somerset, Edison, East
Brunswick, Bridgewater, South Brunswick, North Brunswick, Ewing,
Middlesex, Princeton, Bound Brook, Manville, Pennington, Hopewell,
Far Hills, Rocky Hill, Millstone and Skillman.
This includes the following highways...
New Jersey Turnpike between exits 10 and 11.
Interstate 78 in New Jersey between mile markers 32 and 41.
Interstate 295 in New Jersey between mile markers 63 and 73.
Interstate 287 in New Jersey between mile markers 0 and 20, and
between mile markers 24 and 27.
Garden State Parkway between mile markers 130 and 133.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Protecting yourself from immediate threats to life and safety shall
take priority. Whenever possible, as long as it does not cause
greater harm, all COVID-19 protective action guidance should be
followed.
A Tornado Watch remains in effect until 700 PM EST for central,
northern and northwestern New Jersey.
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4021 7471 4030 7483 4042 7476 4043 7475
4072 7460 4069 7453 4065 7452 4067 7448
4064 7441 4060 7446 4061 7435 4057 7427
TIME...MOT...LOC 2229Z 225DEG 44KT 4030 7470
TORNADO...POSSIBLE
HAIL...<.75IN
WIND...60MPH
$$
JEO2 follow-up statements
999
WWUS51 KPHI 302246
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
546 PM EST Mon Nov 30 2020
NJC021-023-035-302315-
/O.CON.KPHI.SV.W.0307.000000T0000Z-201130T2315Z/
Mercer NJ-Somerset NJ-Middlesex NJ-
546 PM EST Mon Nov 30 2020
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 615 PM EST
FOR NORTHEASTERN MERCER...SOMERSET AND NORTHWESTERN MIDDLESEX
COUNTIES...
At 545 PM EST, a severe thunderstorm was located over Kendall Park,
or 8 miles west of New Brunswick, moving northeast at 45 mph. A
second potentially severe thunderstorm was located just southwest of
Princeton and also moving northeast.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Damage to roofs, siding, trees, and power lines is
possible.
Locations impacted include...
New Brunswick, Somerville, Somerset, Edison, East Brunswick,
Bridgewater, South Brunswick, North Brunswick, Middlesex, Princeton,
Bound Brook, Manville, Pennington, Hopewell, Far Hills, Rocky Hill,
Millstone, Skillman, Flagtown and Colonia.
This includes the following highways...
New Jersey Turnpike between exits 10 and 11.
Interstate 78 in New Jersey between mile markers 32 and 41.
Interstate 295 in New Jersey between mile markers 65 and 71.
Interstate 287 in New Jersey between mile markers 0 and 20, and
between mile markers 24 and 27.
Garden State Parkway between mile markers 130 and 133.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Protecting yourself from immediate threats to life and safety shall
take priority. Whenever possible, as long as it does not cause
greater harm, all COVID-19 protective action guidance should be
followed.
A Tornado Watch remains in effect until 700 PM EST for central,
northern and northwestern New Jersey.
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4023 7469 4031 7480 4042 7476 4043 7475
4072 7460 4069 7453 4065 7452 4067 7448
4064 7441 4060 7446 4061 7435 4057 7427
TIME...MOT...LOC 2245Z 219DEG 41KT 4044 7460
TORNADO...POSSIBLE
HAIL...<.75IN
WIND...60MPH
$$
JEO530
WWUS51 KPHI 302309
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
609 PM EST Mon Nov 30 2020
NJC021-023-035-302319-
/O.EXP.KPHI.SV.W.0307.000000T0000Z-201130T2315Z/
Mercer NJ-Somerset NJ-Middlesex NJ-
609 PM EST Mon Nov 30 2020
...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN MERCER...SOMERSET
AND NORTHWESTERN MIDDLESEX COUNTIES WILL EXPIRE AT 615 PM EST...
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 are still possible with this thunderstorm.
A Tornado Watch remains in effect until 700 PM EST for central,
northern and northwestern New Jersey.
LAT...LON 4023 7469 4031 7480 4042 7476 4043 7475
4072 7460 4069 7453 4065 7452 4067 7448
4064 7441 4060 7446 4061 7435 4057 7427
TIME...MOT...LOC 2309Z 225DEG 44KT 4058 7444
$$
JEOThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Nov 30, 12:52 PM EST | Areal Flood Advisory | PHI | Atlantic, Burlington, Camden, Cape May, Cumberland, Gloucester and 5 more | 92 min |
| Nov 30, 1:28 PM EST | Areal Flood Advisory | PHI | Hunterdon, Warren | 2 hr |
| Nov 30, 2:01 PM EST | Coastal Flood Statement | PHI | Ocean | 3 hr |
| Nov 30, 2:01 PM EST | Areal Flood Warning | PHI | Hunterdon, Mercer, Middlesex, Somerset | 9 hr |
| Nov 30, 2:18 PM EST | Coastal Flood Advisory | PHI | Burlington, Camden, Gloucester | 2 hr |
| Nov 30, 2:34 PM EST | Special Weather Statement | PHI | Morris, Sussex | 56 min |
| Nov 30, 2:48 PM EST | Areal Flood Warning | PHI | Gloucester, Salem | 8 hr |
| Nov 30, 3:01 PM EST | Severe Thunderstorm Warning | PHI | Gloucester, Salem | 44 min |
| Nov 30, 3:26 PM EST | Areal Flood Warning | PHI | Hunterdon, Warren | 4 hr |
| Nov 30, 3:37 PM EST | Special Marine Warning | PHI | 38 min | |
| Nov 30, 3:43 PM EST | Severe Thunderstorm Warning | PHI | Hunterdon, Warren | 47 min |
| Nov 30, 3:47 PM EST | Tornado Warning | PHI | Cumberland, Salem | 28 min |
| Nov 30, 3:53 PM EST | Areal Flood Warning | PHI | Hunterdon, Morris, Somerset, Sussex, Warren | 16 hr |
| Nov 30, 3:53 PM EST | Tornado Warning | PHI | Hunterdon | 13 min |
| Nov 30, 3:58 PM EST | Small Craft Advisory | PHI | 56 hr | |
| Nov 30, 4:17 PM EST | Areal Flood Warning | PHI | Camden, Hunterdon, Mercer, Middlesex | 10 hr |
| Nov 30, 4:49 PM EST | Severe Thunderstorm Warning | PHI | Camden, Cumberland, Gloucester, Salem | 41 min |
| Nov 30, 5:05 PM EST | Special Marine Warning | PHI | 40 min | |
| Nov 30, 5:36 PM EST | River Flood Warning | PHI | Hunterdon, Somerset | 7 hr |
Nearby
Severe Thunderstorm Warnings in New Jersey, 2020Every severe thunderstorm warning in 2020
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.