Alert archive / New Jersey / Severe Thunderstorm Warnings in 2019
Severe Thunderstorm Warning 377, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Aug 21, 2019, 4:36 PM EDT for 4 counties in New Jersey. It was in force for 54 min. 3 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
- Aug 21, 2019, 4:36 PM EDT (20:36 UTC)
- Expired
- Aug 21, 2019, 5:30 PM EDT
- In force
- 54 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Hail
- 0.88 in
- Wind
- 60.0 mph
Counties Hunterdon County, NJ, Middlesex County, NJ, Morris County, NJ, Somerset County, NJ
The radar
The Philadelphia radar (KDIX), 75 km from the middle of the area, began a volume at 20:38 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 |
|---|---|---|---|
| Aug 21, 4:40 PM EDT | TSTM WND DMG | Far Hills, NJ | TREE SNAPPED ON MAIN STREET NEAR FAR HILLS IN BEDMINSTER TWP. TIME ESTIMATED FROM RADAR. |
| Aug 21, 4:55 PM EDT | TSTM WND DMG | Bernards Twp, NJ | TREES AND WIRES DOWN. TIME ESTIMATED FROM RADAR. |
| Aug 21, 4:56 PM EDT | TSTM WND DMG | 1 Sse Madison, NJ | DOWNED POWER LINES NEAR NOE AVENUE AND SHUNPIKE ROAD. 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 |
|---|---|---|---|
| Aug 21, 3:27 PM EDT | Severe Thunderstorm Watch | SPC | 4 hr |
The nearest sounding before it
Brookhaven, NY (KOKX), launched 12:00Z, 8.6 hours before the alert went out and 132 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
- 2157 J/kg
- Mixed-layer CIN
- -4 J/kg
- Mixed-layer LCL
- 499 m above ground
- 0-6 km bulk shear
- 27 kt
- 0-1 km storm-relative helicity
- 79 m²/s²
- 0-3 km storm-relative helicity
- 115 m²/s²
- Significant tornado parameter
- 0.7
- Supercell composite
- 3.7
The text
As transmitted.
390
WUUS51 KPHI 212036
SVRPHI
NJC019-023-027-035-212130-
/O.NEW.KPHI.SV.W.0377.190821T2036Z-190821T2130Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
436 PM EDT Wed Aug 21 2019
The National Weather Service in Mount Holly NJ has issued a
* Severe Thunderstorm Warning for...
Southeastern Morris County in northern New Jersey...
Northeastern Hunterdon County in northwestern New Jersey...
Northern Somerset County in northern New Jersey...
Northeastern Middlesex County in northern New Jersey...
* Until 530 PM EDT.
* At 436 PM EDT, a severe thunderstorm was located over White House
Station, or 9 miles northwest of Somerville, moving east at 25 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...
Perth Amboy, Somerville, Edison, Bridgewater, Carteret, Madison,
Middlesex, Bound Brook, Manville, Chatham, Peapack And Gladstone,
Lebanon, Califon, Far Hills, Colonia, Martinsville, Millington,
White House Station, Society Hill and Basking Ridge.
This includes the following highways...
Garden State Parkway between mile markers 128 and 134.
Interstate 287 in New Jersey between mile markers 0 and 31.
Interstate 78 in New Jersey between mile markers 18 and 42.
New Jersey Turnpike between exits 11 and 13.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
In addition to large 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 4056 7421 4055 7425 4050 7426 4060 7492
4074 7481 4075 7437 4067 7446 4066 7445
4066 7441 4065 7440 4060 7446 4061 7431
4059 7429 4060 7426 4059 7420
TIME...MOT...LOC 2036Z 283DEG 20KT 4064 7476
HAIL...0.88IN
WIND...60MPH
$$
Gorse3 follow-up statements
339
WWUS51 KPHI 212053
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
453 PM EDT Wed Aug 21 2019
NJC019-212103-
/O.CAN.KPHI.SV.W.0377.000000T0000Z-190821T2130Z/
Hunterdon NJ-
453 PM EDT Wed Aug 21 2019
...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN HUNTERDON COUNTY
IS CANCELLED...
The severe thunderstorm which prompted the warning has moved out of
the warned area. Therefore, the warning has been cancelled.
A severe thunderstorm watch remains in effect until 1000 PM EDT for
northern and northwestern New Jersey.
LAT...LON 4056 7421 4055 7425 4050 7426 4056 7470
4059 7472 4062 7471 4064 7473 4073 7472
4075 7437 4068 7445 4066 7445 4065 7440
4060 7446 4060 7426 4059 7421
TIME...MOT...LOC 2053Z 277DEG 21KT 4064 7460
$$
NJC023-027-035-212130-
/O.CON.KPHI.SV.W.0377.000000T0000Z-190821T2130Z/
Morris NJ-Somerset NJ-Middlesex NJ-
453 PM EDT Wed Aug 21 2019
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 530 PM EDT
FOR SOUTHEASTERN MORRIS...NORTHERN SOMERSET AND NORTHEASTERN
MIDDLESEX COUNTIES...
At 453 PM EDT, a severe thunderstorm was located near Far Hills, or
near Somerville, moving east at 25 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...
Perth Amboy, Somerville, Edison, Bridgewater, Carteret, Madison,
Middlesex, Bound Brook, Manville, Chatham, Peapack And Gladstone, Far
Hills, Colonia, Martinsville, Millington, Society Hill, Basking
Ridge, Woodbridge, South Plainfield and North Plainfield.
This includes the following highways...
Garden State Parkway between mile markers 128 and 134.
Interstate 287 in New Jersey between mile markers 0 and 30.
Interstate 78 in New Jersey between mile markers 27 and 41.
New Jersey Turnpike between exits 11 and 13.
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 4056 7421 4055 7425 4050 7426 4056 7470
4059 7472 4062 7471 4064 7473 4073 7472
4075 7437 4068 7445 4066 7445 4065 7440
4060 7446 4060 7426 4059 7421
TIME...MOT...LOC 2053Z 277DEG 21KT 4064 7460
HAIL...0.88IN
WIND...60MPH
$$
Gorse143
WWUS51 KPHI 212103
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
503 PM EDT Wed Aug 21 2019
NJC023-027-035-212130-
/O.CON.KPHI.SV.W.0377.000000T0000Z-190821T2130Z/
Morris NJ-Somerset NJ-Middlesex NJ-
503 PM EDT Wed Aug 21 2019
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 530 PM EDT
FOR SOUTHEASTERN MORRIS...NORTHEASTERN SOMERSET AND NORTHEASTERN
MIDDLESEX COUNTIES...
At 503 PM EDT, a severe thunderstorm was located over Martinsville,
or near Somerville, moving east at 25 mph.
HAZARD...60 mph wind gusts and penny size hail.
SOURCE...Radar indicated.
IMPACT...Damage to roofs, siding, trees, and power lines is
possible.
Locations impacted include...
Perth Amboy, Somerville, Edison, Bridgewater, Carteret, Madison,
Middlesex, Bound Brook, Chatham, Peapack And Gladstone, Far Hills,
Colonia, Martinsville, Millington, Basking Ridge, Society Hill,
Woodbridge, South Plainfield, North Plainfield and Metuchen.
This includes the following highways...
Garden State Parkway between mile markers 128 and 134.
Interstate 287 in New Jersey between mile markers 0 and 8, and
between mile markers 14 and 31.
Interstate 78 in New Jersey between mile markers 31 and 41.
New Jersey Turnpike between exits 11 and 13.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Frequent cloud to ground lightning is occurring with this storm. Move
indoors immediately. Lightning is one of nature's leading killers.
Remember, if you can hear thunder, you are close enough to be struck
by lightning.
&&
LAT...LON 4056 7421 4055 7425 4050 7426 4059 7467
4074 7463 4075 7437 4068 7445 4066 7445
4065 7440 4060 7446 4060 7426 4059 7421
TIME...MOT...LOC 2103Z 283DEG 20KT 4063 7453
HAIL...0.75IN
WIND...60MPH
$$
Gorse259
WWUS51 KPHI 212121
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
521 PM EDT Wed Aug 21 2019
NJC023-027-035-212131-
/O.EXP.KPHI.SV.W.0377.000000T0000Z-190821T2130Z/
Morris NJ-Somerset NJ-Middlesex NJ-
521 PM EDT Wed Aug 21 2019
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN MORRIS...
NORTHEASTERN SOMERSET AND NORTHEASTERN MIDDLESEX COUNTIES WILL EXPIRE
AT 530 PM EDT...
The storm which prompted the warning has moved out of the area.
Therefore, the warning will be allowed to expire.
A severe thunderstorm watch remains in effect until 1000 PM EDT for
northern New Jersey.
LAT...LON 4056 7421 4055 7425 4050 7426 4059 7467
4074 7463 4075 7437 4068 7445 4066 7445
4065 7440 4060 7446 4060 7426 4059 7421
TIME...MOT...LOC 2121Z 283DEG 20KT 4061 7442
$$
GorseThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 21, 3:30 AM EDT | Small Craft Advisory | PHI | 23 hr | |
| Aug 21, 4:24 AM EDT | Special Marine Warning | PHI | 96 min | |
| Aug 21, 5:32 AM EDT | Special Marine Warning | PHI | 58 min | |
| Aug 21, 4:15 PM EDT | Special Weather Statement | PHI | Hunterdon | 30 min |
Nearby
Severe Thunderstorm Warnings in New Jersey, 2019Every severe thunderstorm warning in 2019
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.