Alert archive / New Jersey / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 111, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 1, 2021, 4:27 PM EDT for New Castle County, Delaware; 7 counties in New Jersey; 4 counties in Pennsylvania. It was in force for 48 min. 6 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
- Jul 1, 2021, 4:27 PM EDT (20:27 UTC)
- Expired
- Jul 1, 2021, 5:15 PM EDT
- In force
- 48 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties New Castle County, DE, Burlington County, NJ, Camden County, NJ, Gloucester County, NJ, Hunterdon County, NJ, Mercer County, NJ, Salem County, NJ, Somerset County, NJ, Bucks County, PA, Delaware County, PA, Montgomery County, PA, Philadelphia County, PA
The radar
The Philadelphia radar (KDIX), 51 km from the middle of the area, began a volume at 20:29 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 |
|---|---|---|---|
| Jul 1, 4:30 PM EDT | TSTM WND DMG | 1 Ne Jenkintown, PA | DOWNED TREE ON WIRES NEAR THE INTERSECTION OF WASHINGTON LANE AND PEPPER ROAD. TIME ESTIMATED FROM RADAR. |
| Jul 1, 4:48 PM EDT | TSTM WND DMG | Tacony, PA | MPING REPORT OF WIND DAMAGE NEAR JACKSON STREET. TIME ESTIMATED FROM RADAR. |
| Jul 1, 4:50 PM EDT | TSTM WND DMG | 1 Ne Feasterville-Trevo, PA | TREE DOWN ON U.S. ROUTE 1. |
| Jul 1, 4:53 PM EDT | TSTM WND DMG | Levittown, PA | SEVERAL REPORTS OF DOWNED TREE LIMBS AND WIRES IN LEVITTOWN. TIME ESTIMATED FROM RADAR. |
| Jul 1, 4:59 PM EDT | TSTM WND DMG | 1 Se Fairless Hills, PA | SEVERAL REPORTS OF DOWNED POWER LINES NEAR FAIRLESS HILLS. TIME ESTIMATED FROM RADAR. |
| Jul 1, 5:19 PM EDT | TSTM WND DMG | 2 Wsw Yardville, NJ | DOWNED WIRES ON GRAND AVENUE. 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 |
|---|---|---|---|
| Jul 1, 12:46 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
The nearest sounding before it
Brookhaven, NY (KOKX), launched 12:00Z, 8.5 hours before the alert went out and 197 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
- 286 J/kg
- Mixed-layer CIN
- -126 J/kg
- Mixed-layer LCL
- 978 m above ground
- 0-6 km bulk shear
- 38 kt
- 0-1 km storm-relative helicity
- 22 m²/s²
- 0-3 km storm-relative helicity
- 84 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
The text
As transmitted.
032
WUUS51 KPHI 012027
SVRPHI
DEC003-NJC005-007-015-019-021-033-035-PAC017-045-091-101-012115-
/O.NEW.KPHI.SV.W.0111.210701T2027Z-210701T2115Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
427 PM EDT Thu Jul 1 2021
The National Weather Service in Mount Holly NJ has issued a
* Severe Thunderstorm Warning for...
Northeastern New Castle County in northern Delaware...
Northern Salem County in southern New Jersey...
South central Hunterdon County in northwestern New Jersey...
Northwestern Camden County in southern New Jersey...
Mercer County in central New Jersey...
Northwestern Gloucester County in southern New Jersey...
Northwestern Burlington County in southern New Jersey...
South central Somerset County in northern New Jersey...
Southeastern Montgomery County in southeastern Pennsylvania...
Southeastern Bucks County in southeastern Pennsylvania...
Philadelphia County in southeastern Pennsylvania...
Delaware County in southeastern Pennsylvania...
* Until 515 PM EDT.
* At 426 PM EDT, severe thunderstorms were located along a line
extending from New Hope to Bryn Athyn to near Newtown Square to
Delaware City, moving east at 25 mph.
HAZARD...60 mph wind gusts.
SOURCE...Law enforcement.
IMPACT...Damage to roofs, siding, trees, and power lines is
possible.
* Locations impacted include...
Philadelphia, Trenton, Camden, Wilmington, Gloucester City,
Bensalem, Ewing, Chester, Willingboro, Deptford, West Deptford,
Glassboro, Pennsville, Princeton, Florence, Bellmawr, Yeadon,
Woodbury, Burlington and Bristol.
People at the Welcome America Events should seek safe shelter
immediately!
This includes the following highways...
New Jersey Turnpike between exits 1 and 3, and between exits 6 and
6A.
Pennsylvania Turnpike between mile markers 341 and 359.
Interstate 95 in Pennsylvania between mile markers 0 and 40.
Interstate 95 in Delaware between mile markers 11 and 23.
Interstate 76 in Pennsylvania between mile markers 335 and 351.
Interstate 76 in New Jersey between mile markers 0 and 3.
Interstate 195 in New Jersey between mile markers 0 and 3.
Interstate 295 in New Jersey between mile markers 0 and 30, and
between mile markers 55 and 76.
Interstate 676 in Pennsylvania between mile markers 0 and 1.
Interstate 676 in New Jersey between mile markers 0 and 4.
Interstate 476 in Pennsylvania between mile markers 0 and 11.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4035 7463 4033 7462 4014 7468 3997 7498
3957 7522 3957 7569 3994 7547 4013 7516
4040 7503 4041 7460
TIME...MOT...LOC 2026Z 266DEG 24KT 4037 7498 4014 7509 3995 7540 3960
7559
HAIL...<.75IN
WIND...60MPH
$$
CMS1 follow-up statement
131
WWUS51 KPHI 012049
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
449 PM EDT Thu Jul 1 2021
DEC003-012058-
/O.CAN.KPHI.SV.W.0111.000000T0000Z-210701T2115Z/
New Castle DE-
449 PM EDT Thu Jul 1 2021
...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN NEW CASTLE COUNTY
IS CANCELLED...
The storms which prompted the warning have moved out of the warned
area. Therefore, the warning has been cancelled.
A Severe Thunderstorm Watch remains in effect until 800 PM EDT for
northern Delaware...southern, central and northern New Jersey...and
southeastern Pennsylvania.
LAT...LON 4014 7468 3997 7498 3957 7522 3957 7550
4004 7531 4013 7516 4040 7492 4041 7460
TIME...MOT...LOC 2048Z 266DEG 24KT 4038 7479 4015 7490 3996 7521 3961
7540
$$
NJC005-007-015-019-021-033-035-PAC017-045-091-101-012115-
/O.CON.KPHI.SV.W.0111.000000T0000Z-210701T2115Z/
Salem NJ-Hunterdon NJ-Camden NJ-Mercer NJ-Gloucester NJ-
Burlington NJ-Somerset NJ-Montgomery PA-Bucks PA-Philadelphia PA-
Delaware PA-
449 PM EDT Thu Jul 1 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 515 PM EDT
FOR CENTRAL SALEM...SOUTHERN HUNTERDON...NORTHWESTERN CAMDEN...
MERCER...NORTHWESTERN GLOUCESTER...NORTHWESTERN BURLINGTON...SOUTH
CENTRAL SOMERSET...SOUTHEASTERN MONTGOMERY...SOUTHEASTERN BUCKS...
PHILADELPHIA AND EASTERN DELAWARE COUNTIES...
At 448 PM EDT, severe thunderstorms were located along a line
extending from Hopewell to near Langhorn to near Roxborough to near
Alloway, moving east at 30 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Damage to roofs, siding, trees, and power lines is
possible.
Locations impacted include...
Philadelphia, Trenton, Camden, Gloucester City, Bensalem, Ewing,
Chester, Willingboro, Deptford, West Deptford, Glassboro, Princeton,
Florence, Bellmawr, Yeadon, Woodbury, Burlington, Bristol, Pitman and
Riverside.
People at the Welcome America Events should seek safe shelter
immediately!
This includes the following highways...
New Jersey Turnpike between exits 1 and 3, and between exits 6 and
6A.
Pennsylvania Turnpike between mile markers 342 and 359.
Interstate 95 in Pennsylvania between mile markers 4 and 40.
Interstate 76 in Pennsylvania between mile markers 335 and 351.
Interstate 76 in New Jersey between mile markers 0 and 3.
Interstate 195 in New Jersey between mile markers 0 and 3.
Interstate 295 in New Jersey between mile markers 5 and 30, and
between mile markers 55 and 76.
Interstate 676 in Pennsylvania between mile markers 0 and 1.
Interstate 676 in New Jersey between mile markers 0 and 4.
Interstate 476 in Pennsylvania between mile markers 0 and 3, and
between mile markers 6 and 8.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4014 7468 3997 7498 3957 7522 3957 7550
4004 7531 4013 7516 4040 7492 4041 7460
TIME...MOT...LOC 2048Z 266DEG 24KT 4038 7479 4015 7490 3996 7521 3961
7540
HAIL...<.75IN
WIND...60MPH
$$
CMSThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 30, 9:21 PM EDT | Special Weather Statement | PHI | New Castle | 39 min |
| Jul 1, 3:48 PM EDT | Areal Flood Advisory | PHI | New Castle | 112 min |
| Jul 1, 3:50 PM EDT | Severe Thunderstorm Warning | PHI | New Castle | 40 min |
| Jul 1, 4:08 PM EDT | Severe Thunderstorm Warning | PHI | Sussex | 52 min |
| Jul 1, 4:08 PM EDT | Severe Thunderstorm Warning | PHI | Kent | 52 min |
| Jul 1, 4:10 PM EDT | Areal Flood Advisory | PHI | Kent, New Castle | 94 min |
| Jul 1, 4:32 PM EDT | Severe Thunderstorm Warning | PHI | Kent, New Castle, Sussex | 43 min |
| Jul 1, 4:57 PM EDT | Tornado Warning | PHI | Kent, Sussex | 22 min |
| Jul 1, 5:12 PM EDT | Severe Thunderstorm Warning | PHI | Kent, Sussex | 48 min |
| Jun 30, 8:37 PM EDT | Severe Thunderstorm Warning | PHI | Hunterdon, Mercer | 38 min |
| Jun 30, 8:56 PM EDT | Special Marine Warning | PHI | 94 min | |
| Jun 30, 9:05 PM EDT | Special Weather Statement | PHI | Somerset | 40 min |
| Jun 30, 9:49 PM EDT | Special Weather Statement | PHI | Monmouth | 26 min |
| Jun 30, 9:51 PM EDT | Special Marine Warning | PHI | 60 min | |
| Jul 1, 2:58 AM EDT | Small Craft Advisory | PHI | 17 hr | |
| Jul 1, 1:10 PM EDT | Special Weather Statement | PHI | Monmouth | 50 min |
| Jul 1, 1:16 PM EDT | Special Weather Statement | PHI | Atlantic | 29 min |
| Jul 1, 1:28 PM EDT | Special Marine Warning | PHI | 62 min | |
| Jul 1, 1:31 PM EDT | Special Weather Statement | PHI | Cumberland | 29 min |
| Jul 1, 4:21 PM EDT | Special Marine Warning | PHI | 114 min | |
| Jul 1, 4:55 PM EDT | Severe Thunderstorm Warning | PHI | Cape May, Cumberland, Salem | 80 min |
| Jul 1, 4:59 PM EDT | Severe Thunderstorm Warning | PHI | Burlington, Camden, Gloucester, Mercer, Middlesex, Monmouth and 2 more | 46 min |
| Jul 1, 5:02 PM EDT | Tornado Warning | PHI | Burlington, Mercer | 28 min |
| Jul 1, 5:27 PM EDT | Severe Thunderstorm Warning | PHI | Atlantic, Burlington, Camden, Cape May, Cumberland, Gloucester and 5 more | 93 min |
| Jul 1, 5:35 PM EDT | Tornado Warning | PHI | Mercer, Monmouth, Ocean | 25 min |
| Jul 1, 5:40 PM EDT | Special Marine Warning | PHI | 65 min | |
| Jul 1, 5:46 PM EDT | Special Marine Warning | PHI | 119 min | |
| Jul 1, 6:13 PM EDT | Special Marine Warning | PHI | 92 min | |
| Jun 30, 8:16 PM EDT | Special Weather Statement | PHI | Bucks, Montgomery | 44 min |
| Jul 1, 2:51 PM EDT | Special Weather Statement | PHI | Chester, Montgomery | 39 min |
| Jul 1, 3:13 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Bucks, Chester, Lehigh, Montgomery | 47 min |
| Jul 1, 3:23 PM EDT | Areal Flood Advisory | PHI | Chester, Montgomery | 77 min |
Nearby
Severe Thunderstorm Warnings in New Jersey, 2021Severe Thunderstorm Warnings in Pennsylvania, 2021Severe Thunderstorm Warnings in Delaware, 2021Every severe thunderstorm warning in 2021
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.