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Severe Thunderstorm Warning 0039
Issued by the Mount Holly / Philadelphia Forecast Office

Action Issued Starts Expiration
New 2026-05-20 16:16:00 2026-05-20 16:15:00 2026-05-20 17:00:00
Cancelled 2026-05-20 16:45:31 2026-05-20 17:00:00
Continued 2026-05-20 16:45:31 2026-05-20 17:00:00


Action: New
Issued At: 2026-05-20 16:16:00

534 
WUUS51 KPHI 202115
SVRPHI
NJC005-019-021-035-PAC017-029-091-101-202200-
/O.NEW.KPHI.SV.W.0039.260520T2115Z-260520T2200Z/

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

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  Southeastern Hunterdon County in northwestern New Jersey...
  Mercer County in central New Jersey...
  North central Burlington County in southern New Jersey...
  Southwestern Somerset County in northern New Jersey...
  Montgomery County in southeastern Pennsylvania...
  Bucks County in southeastern Pennsylvania...
  Northeastern Chester County in southeastern Pennsylvania...
  Northeastern Philadelphia County in southeastern Pennsylvania...

* Until 600 PM EDT.

* At 515 PM EDT, a severe thunderstorm was located over Chalfont, or
  19 miles north of Philadelphia, 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, Ewing, Norristown, Phoenixville, Lansdale,
  West Norriton, East Norriton, Princeton, Florence, Bristol,
  Perkasie, Doylestown, Byram, Hatboro, Souderton, Ambler,
  Collegeville, Royersford, and Chalfont.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4010 7559 4042 7551 4042 7534 4043 7465
      4011 7468
TIME...MOT...LOC 2115Z 275DEG 26KT 4028 7520 

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

$$

Fitzsimmons


Action: Cancelled
Issued At: 2026-05-20 16:45:31

418 
WWUS51 KPHI 202145
SVSPHI

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

PAC029-202154-
/O.CAN.KPHI.SV.W.0039.000000T0000Z-260520T2200Z/
Chester PA-
545 PM EDT Wed May 20 2026

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN CHESTER 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 900 PM EDT for
southern, central, northern and northwestern New Jersey...and
southeastern Pennsylvania.

LAT...LON 4011 7522 4042 7521 4043 7465 4011 7468
TIME...MOT...LOC 2144Z 275DEG 26KT 4026 7492 

$$

NJC005-019-021-035-PAC017-091-101-202200-
/O.CON.KPHI.SV.W.0039.000000T0000Z-260520T2200Z/
Hunterdon NJ-Mercer NJ-Burlington NJ-Somerset NJ-Montgomery PA-
Bucks PA-Philadelphia PA-
545 PM EDT Wed May 20 2026

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 600 PM EDT
FOR SOUTHEASTERN HUNTERDON...MERCER...NORTH CENTRAL BURLINGTON...
SOUTHWESTERN SOMERSET...EAST CENTRAL MONTGOMERY...SOUTHEASTERN BUCKS
AND NORTHEASTERN PHILADELPHIA COUNTIES...

At 544 PM EDT, a severe thunderstorm was located over Newtown, or 8
miles west of Trenton, 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, Ewing, Princeton, Florence, Bristol,
Doylestown, Byram, Hatboro, Ambler, Chalfont, Bordentown, Pennington,
New Hope, Yardley, Newtown, Dublin, Hopewell, Tullytown, and
Abington.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4011 7522 4042 7521 4043 7465 4011 7468
TIME...MOT...LOC 2144Z 275DEG 26KT 4026 7492 

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

$$

Fitzsimmons


Action: Continued
Issued At: 2026-05-20 16:45:31

418 
WWUS51 KPHI 202145
SVSPHI

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

PAC029-202154-
/O.CAN.KPHI.SV.W.0039.000000T0000Z-260520T2200Z/
Chester PA-
545 PM EDT Wed May 20 2026

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN CHESTER 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 900 PM EDT for
southern, central, northern and northwestern New Jersey...and
southeastern Pennsylvania.

LAT...LON 4011 7522 4042 7521 4043 7465 4011 7468
TIME...MOT...LOC 2144Z 275DEG 26KT 4026 7492 

$$

NJC005-019-021-035-PAC017-091-101-202200-
/O.CON.KPHI.SV.W.0039.000000T0000Z-260520T2200Z/
Hunterdon NJ-Mercer NJ-Burlington NJ-Somerset NJ-Montgomery PA-
Bucks PA-Philadelphia PA-
545 PM EDT Wed May 20 2026

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 600 PM EDT
FOR SOUTHEASTERN HUNTERDON...MERCER...NORTH CENTRAL BURLINGTON...
SOUTHWESTERN SOMERSET...EAST CENTRAL MONTGOMERY...SOUTHEASTERN BUCKS
AND NORTHEASTERN PHILADELPHIA COUNTIES...

At 544 PM EDT, a severe thunderstorm was located over Newtown, or 8
miles west of Trenton, 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, Ewing, Princeton, Florence, Bristol,
Doylestown, Byram, Hatboro, Ambler, Chalfont, Bordentown, Pennington,
New Hope, Yardley, Newtown, Dublin, Hopewell, Tullytown, and
Abington.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4011 7522 4042 7521 4043 7465 4011 7468
TIME...MOT...LOC 2144Z 275DEG 26KT 4026 7492 

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

$$

Fitzsimmons



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