Alert archive / New Jersey / Severe Thunderstorm Warnings in 2026
Severe Thunderstorm Warning 48, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at May 20, 2026, 6:09 PM EDT for Delaware County, Philadelphia County, Pennsylvania; 5 counties in New Jersey. It was in force for 46 min. 2 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
- May 20, 2026, 6:09 PM EDT (22:09 UTC)
- Expired
- May 20, 2026, 6:55 PM EDT
- In force
- 46 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties Atlantic County, NJ, Burlington County, NJ, Camden County, NJ, Gloucester County, NJ, Ocean County, NJ, Delaware County, PA, Philadelphia County, PA
The radar
The Philadelphia radar (KDIX), 40 km from the middle of the area, began a volume at 22:11 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 |
|---|---|---|---|
| May 20, 6:10 PM EDT | TSTM WND DMG | Medford, NJ | Wires down along Taunton Road and Himmelein Road in Medford, likely due to the outflow boundary. Time estimated from radar. |
| May 20, 6:10 PM EDT | TSTM WND DMG | Medford, NJ | Wires down along Taunton Road and Himmelein Road in Medford, likely due to the outflow boundary. 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 |
|---|---|---|---|
| May 20, 2:10 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
The nearest sounding before it
Brookhaven, NY (KOKX), launched 12:00Z, 10.2 hours before the alert went out and 204 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
- 31 J/kg
- Mixed-layer CIN
- -279 J/kg
- Mixed-layer LCL
- 1524 m above ground
- 0-6 km bulk shear
- 19 kt
- 0-1 km storm-relative helicity
- 90 m²/s²
- 0-3 km storm-relative helicity
- 80 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
168
WUUS51 KPHI 202209
SVRPHI
NJC001-005-007-015-029-PAC045-101-202315-
/O.NEW.KPHI.SV.W.0048.260520T2209Z-260520T2315Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
609 PM EDT Wed May 20 2026
The National Weather Service in Mount Holly NJ has issued a
* Severe Thunderstorm Warning for...
Northern Atlantic County in southern New Jersey...
West central Ocean County in southern New Jersey...
Camden County in southern New Jersey...
Northeastern Gloucester County in southern New Jersey...
Burlington County in southern New Jersey...
Southwestern Philadelphia County in southeastern Pennsylvania...
East central Delaware County in southeastern Pennsylvania...
* Until 715 PM EDT.
* At 609 PM EDT, a severe thunderstorm was located over Magnolia, or
near Gloucester City, 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, Camden, Gloucester City, Cherry Hill, Evesham, Mount
Laurel, Deptford, Voorhees, Medford, West Deptford, Glassboro,
Lindenwold, Hammonton, Lumberton, Bellmawr, Yeadon, Woodbury, Mount
Holly, Pitman, and Berlin.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Wind damage with this storm will occur before any rain or lightning.
Do not wait for the sound of thunder before taking cover. SEEK
SHELTER IMMEDIATELY inside a sturdy structure and stay away from
windows.
&&
LAT...LON 3969 7441 3970 7495 3975 7531 3998 7527
4000 7523 4000 7436
TIME...MOT...LOC 2209Z 272DEG 25KT 3988 7505
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
Fitzsimmons2 follow-up statements
521
WWUS51 KPHI 202237
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
637 PM EDT Wed May 20 2026
NJC015-PAC045-101-202247-
/O.CAN.KPHI.SV.W.0048.000000T0000Z-260520T2315Z/
Gloucester NJ-Philadelphia PA-Delaware PA-
637 PM EDT Wed May 20 2026
...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN GLOUCESTER...
SOUTHWESTERN PHILADELPHIA AND EAST CENTRAL DELAWARE COUNTIES IS
CANCELLED...
The severe thunderstorm which prompted the warning has moved out of
the warned area. Therefore, the warning has been
cancelled.
A Severe Thunderstorm Watch remains in effect until 900 PM EDT for
southern New Jersey.
LAT...LON 3969 7441 3970 7496 3970 7498 3973 7502
4000 7500 4000 7436
TIME...MOT...LOC 2237Z 272DEG 25KT 3987 7480
$$
NJC001-005-007-029-202315-
/O.CON.KPHI.SV.W.0048.000000T0000Z-260520T2315Z/
Atlantic NJ-Ocean NJ-Camden NJ-Burlington NJ-
637 PM EDT Wed May 20 2026
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 715 PM EDT
FOR NORTHERN ATLANTIC...WEST CENTRAL OCEAN...CENTRAL CAMDEN AND
BURLINGTON COUNTIES...
At 637 PM EDT, a severe thunderstorm was located over Medford, or 16
miles east of Camden, 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...
Cherry Hill, Evesham, Mount Laurel, Voorhees, Medford, Lindenwold,
Hammonton, Lumberton, Mount Holly, Berlin, Tabernacle, Shamong,
Presidential Lakes Estates, Chesilhurst, Pemberton, Wrightstown,
Atsion, Barclay-Kingston, Marlton, and Leisuretowne.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Wind damage with this storm will occur before any rain or lightning.
Do not wait for the sound of thunder before taking cover. SEEK
SHELTER IMMEDIATELY inside a sturdy structure and stay away from
windows.
&&
LAT...LON 3969 7441 3970 7496 3970 7498 3973 7502
4000 7500 4000 7436
TIME...MOT...LOC 2237Z 272DEG 25KT 3987 7480
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
Fitzsimmons395
WWUS51 KPHI 202255
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
655 PM EDT Wed May 20 2026
NJC001-005-007-029-202305-
/O.CAN.KPHI.SV.W.0048.000000T0000Z-260520T2315Z/
Atlantic NJ-Ocean NJ-Camden NJ-Burlington NJ-
655 PM EDT Wed May 20 2026
...THE SEVERE THUNDERSTORM WARNING FOR NORTHERN ATLANTIC...WEST
CENTRAL OCEAN...CENTRAL CAMDEN AND BURLINGTON COUNTIES IS
CANCELLED...
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning has been cancelled. However gusty winds and
heavy rain are still possible with this thunderstorm.
A Severe Thunderstorm Watch remains in effect until 900 PM EDT for
southern New Jersey.
LAT...LON 3969 7441 3970 7496 3970 7498 3973 7502
4000 7500 4000 7436
TIME...MOT...LOC 2253Z 272DEG 25KT 3987 7463
$$
FitzsimmonsThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 19, 8:04 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Montgomery, Philadelphia | 25 min |
| May 20, 3:57 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Lehigh | 48 min |
| May 20, 4:00 PM EDT | Severe Thunderstorm Warning | PHI | Berks | 45 min |
| May 20, 4:29 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Chester, Montgomery | 46 min |
| May 20, 4:43 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Bucks, Lehigh, Northampton | 47 min |
| May 20, 4:46 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Bucks, Lehigh, Montgomery | 44 min |
| May 20, 4:50 PM EDT | Severe Thunderstorm Warning | PHI | Chester, Delaware | 40 min |
| May 20, 5:10 PM EDT | Severe Thunderstorm Warning | PHI | Chester, Delaware, Montgomery, Philadelphia | 50 min |
| May 20, 5:15 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Chester, Montgomery, Philadelphia | 45 min |
| May 20, 5:24 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Northampton | 51 min |
| May 20, 5:29 PM EDT | Severe Thunderstorm Warning | PHI | Chester, Delaware, Philadelphia | 46 min |
| May 20, 5:40 PM EDT | Flash Flood Warning | PHI | Bucks, Delaware, Montgomery, Philadelphia | 3 hr |
| May 20, 5:41 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Montgomery, Philadelphia | 49 min |
| May 20, 5:52 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Montgomery, Philadelphia | 38 min |
| May 20, 6:01 PM EDT | Severe Thunderstorm Warning | PHI | Delaware, Montgomery, Philadelphia | 44 min |
| May 20, 2:25 PM EDT | Small Craft Advisory | PHI | 3 days | |
| May 20, 5:01 PM EDT | Special Marine Warning | PHI | 86 min | |
| May 20, 5:35 PM EDT | Severe Thunderstorm Warning | PHI | Salem | 40 min |
| May 20, 6:04 PM EDT | Severe Thunderstorm Warning | PHI | Hunterdon, Middlesex, Monmouth, Morris, Somerset | 56 min |
| May 20, 6:07 PM EDT | Special Marine Warning | PHI | 53 min | |
| May 20, 6:12 PM EDT | Severe Thunderstorm Warning | PHI | Ocean | 33 min |
| May 20, 6:17 PM EDT | Special Marine Warning | PHI | 118 min | |
| May 20, 6:23 PM EDT | Severe Thunderstorm Warning | PHI | Burlington, Mercer, Middlesex, Monmouth, Ocean, Somerset | 56 min |
| May 20, 6:58 PM EDT | Severe Thunderstorm Warning | PHI | Ocean | 32 min |
| May 20, 7:30 PM EDT | Special Marine Warning | PHI | 90 min |
Nearby
Severe Thunderstorm Warnings in New Jersey, 2026Severe Thunderstorm Warnings in Pennsylvania, 2026Every severe thunderstorm warning in 2026
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.