Alert archive / New Jersey / Severe Thunderstorm Warnings in 2026

Severe Thunderstorm Warning 44, NWS Philadelphia/Mount Holly

May 20, 2026Bucks County, Montgomery County, Philadelphia County, Pennsylvania; 4 counties in New Jersey

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at May 20, 2026, 5:41 PM EDT for Bucks County, Montgomery County, Philadelphia County, Pennsylvania; 4 counties in New Jersey. It was in force for 49 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: May 20, 2026, 5:41 PM EDT (21:41 UTC)
Expired: May 20, 2026, 6:30 PM EDT
In force: 49 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Burlington County, NJ, Mercer County, NJ, Monmouth County, NJ, Ocean County, NJ, Bucks County, PA, Montgomery County, PA, Philadelphia County, PA

The radar

The Philadelphia radar (KDIX), 42 km from the middle of the area, began a volume at 21:43 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, 5:43 PM EDT	TSTM WND DMG	1 Nw Levittown, PA	Large tree limbs down, some onto powerlines, on High Road. Time estimated from radar.
May 20, 5:43 PM EDT	TSTM WND GST 56	Northeast Philadelphia, PA	ASOS station KPNE Philadelphia Northeast.
May 20, 5:54 PM EDT	TSTM WND GST 51	3 E Tullytown, PA	Mesonet station NBLP1 Newbold NOS.
May 20, 6:06 PM EDT	TSTM WND DMG	Bordentown, NJ	Several wires down across Bordentown and Chesterfield. Time estimated from radar.
May 20, 6:06 PM EDT	TSTM WND DMG	Bordentown, NJ	Several wires down across Bordentown and Chesterfield. Time estimated from radar.
May 20, 6:10 PM EDT	TSTM WND GST 50	Upper Freehold Twp, NJ	Mesonet station NJ54 Cream Ridge.

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, 9.7 hours before the alert went out and 191 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

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

Open this sounding in Storm Lab

The text

As transmitted.

254 
WUUS51 KPHI 202141
SVRPHI
NJC005-021-025-029-PAC017-091-101-202230-
/O.NEW.KPHI.SV.W.0044.260520T2141Z-260520T2230Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
541 PM EDT Wed May 20 2026

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  Northwestern Ocean County in southern New Jersey...
  Southeastern Mercer County in central New Jersey...
  Northern Burlington County in southern New Jersey...
  Southwestern Monmouth County in central New Jersey...
  East central Montgomery County in southeastern Pennsylvania...
  Southeastern Bucks County in southeastern Pennsylvania...
  Northeastern Philadelphia County in southeastern Pennsylvania...

* Until 630 PM EDT.

* At 540 PM EDT, a severe thunderstorm was located over Bensalem, or
  11 miles northeast of Philadelphia, moving east at 25 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, Bensalem, Willingboro, Florence, Burlington,
  Bristol, Mount Holly, Riverside, Palmyra, Hatboro, Jenkintown,
  Bordentown, Beverly, Rockledge, Tullytown, Allentown, Abington,
  Langhorne, and Pemberton.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 4002 7516 4018 7514 4021 7445 3995 7446
TIME...MOT...LOC 2140Z 272DEG 23KT 4010 7496 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Fitzsimmons

1 follow-up statement

524 
WWUS51 KPHI 202219
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
619 PM EDT Wed May 20 2026

PAC091-101-202229-
/O.CAN.KPHI.SV.W.0044.000000T0000Z-260520T2230Z/
Montgomery PA-Philadelphia PA-
619 PM EDT Wed May 20 2026

...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL MONTGOMERY AND
NORTHEASTERN PHILADELPHIA 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 and central New Jersey...and southeastern Pennsylvania.

LAT...LON 4001 7486 4019 7484 4021 7445 3995 7446
      3995 7448
TIME...MOT...LOC 2219Z 272DEG 23KT 4009 7463 

$$

NJC005-021-025-029-PAC017-202230-
/O.CON.KPHI.SV.W.0044.000000T0000Z-260520T2230Z/
Ocean NJ-Mercer NJ-Burlington NJ-Monmouth NJ-Bucks PA-
619 PM EDT Wed May 20 2026

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 630 PM EDT
FOR NORTHWESTERN OCEAN...SOUTHEASTERN MERCER...NORTHEASTERN
BURLINGTON...SOUTHWESTERN MONMOUTH AND SOUTHEASTERN BUCKS COUNTIES...

At 619 PM EDT, a severe thunderstorm was located over Georgetown, or
11 miles southeast of Trenton, moving east at 25 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...Damage to roofs, siding, trees, and power lines is 
         possible.

Locations impacted include...
Trenton, Florence, Burlington, Bristol, Bordentown, Tullytown,
Allentown, Roosevelt, Wrightstown, Florence-Roebling, Jacksonville,
Georgetown, Crosswicks, White Horse, Woodruff, Imlaystown, Cream
Ridge, Browns Mills, Jobstown, and Columbus.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 4001 7486 4019 7484 4021 7445 3995 7446
      3995 7448
TIME...MOT...LOC 2219Z 272DEG 23KT 4009 7463 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Fitzsimmons

The 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, 5:52 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, 6:09 PM EDT	Severe Thunderstorm Warning	PHI	Delaware, Philadelphia	46 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 Considerable damage threat	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, 2026 Severe Thunderstorm Warnings in Pennsylvania, 2026 Every 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.