Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2023

Severe Thunderstorm Warning 69, NWS Philadelphia/Mount Holly

June 16, 20234 counties in Pennsylvania; New Castle County, Delaware; Gloucester County, Salem County, New Jersey

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jun 16, 2023, 11:20 AM EDT for 4 counties in Pennsylvania; New Castle County, Delaware; Gloucester County, Salem County, New Jersey. It was in force for 40 min. 12 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: Jun 16, 2023, 11:20 AM EDT (15:20 UTC)
Expired: Jun 16, 2023, 12:00 PM EDT
In force: 40 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Tornado: Possible
Hail: 1.0 in
Wind: 60.0 mph

Counties New Castle County, DE, Gloucester County, NJ, Salem County, NJ, Berks County, PA, Chester County, PA, Delaware County, PA, Montgomery County, PA

The radar

The Philadelphia radar (KDIX), 104 km from the middle of the area, began a volume at 15:22 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
Jun 16, 11:20 AM EDT	TSTM WND DMG	Wagontown, PA	Downed tree in wires on Hibernia Road. Time estimated from radar.
Jun 16, 11:20 AM EDT	TSTM WND DMG	Wagontown, PA	Downed tree in wires on Hibernia Road. Time estimated from radar.
Jun 16, 11:20 AM EDT	TSTM WND GST 44	2 E Londonderry Twp, PA	Mesonet station DSCR White Clay Creek West Grove-SECCRA.
Jun 16, 11:20 AM EDT	TSTM WND GST 44	2 E Londonderry Twp, PA	Mesonet station DSCR White Clay Creek West Grove-SECCRA.
Jun 16, 11:22 AM EDT	TSTM WND DMG	West Brandywine Twp, PA	Severe trees with branches twisted off about 10 feet above the ground with numerous other trees down. Time estimated from radar.
Jun 16, 11:22 AM EDT	TSTM WND DMG	West Brandywine Twp, PA	Severe trees with branches twisted off about 10 feet above the ground with numerous other trees down. Time estimated from radar.
Jun 16, 11:47 AM EDT	HAIL 0.5	1 E Lenape, PA	Report from mPING: Half-inch (0.50 in.).
Jun 16, 11:47 AM EDT	HAIL 0.5	1 E Lenape, PA	Report from mPING: Half-inch (0.50 in.).
Jun 16, 11:55 AM EDT	HAIL 1	7 Ene Valley Forge, PA
Jun 16, 11:55 AM EDT	HAIL 1	7 Ene Valley Forge, PA
Jun 16, 12:09 PM EDT	TSTM WND DMG	Norristown, PA	Report from mPING: 1-inch tree limbs broken; Shingles blown off.
Jun 16, 12:09 PM EDT	TSTM WND DMG	Norristown, PA	Report from mPING: 1-inch tree limbs broken; Shingles blown off.

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
Jun 16, 11:06 AM EDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 12:00Z, 3.3 hours before the alert went out and 196 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: 119 J/kg
Mixed-layer CIN: -101 J/kg
Mixed-layer LCL: 910 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: 40 m²/s²
0-3 km storm-relative helicity: 101 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

The text

As transmitted.

359 
WUUS51 KPHI 161520
SVRPHI
DEC003-NJC015-033-PAC011-029-045-091-161600-
/O.NEW.KPHI.SV.W.0069.230616T1520Z-230616T1600Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
1120 AM EDT Fri Jun 16 2023

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  Northern New Castle County in northern Delaware...
  Northwestern Salem County in southern New Jersey...
  Northwestern Gloucester County in southern New Jersey...
  Southeastern Berks County in eastern Pennsylvania...
  Southwestern Montgomery County in southeastern Pennsylvania...
  Chester County in southeastern Pennsylvania...
  Delaware County in southeastern Pennsylvania...

* Until noon EDT.

* At 1119 AM EDT, severe thunderstorms were located along a line
  extending from Elverson to near Coatesville to near Kemblesville,
  moving east at 35 mph.

  HAZARD...60 mph wind gusts and quarter size hail.

  SOURCE...Radar indicated.

  IMPACT...Minor damage to vehicles is possible. Wind damage to 
           roofs, siding, trees, and power lines is possible.

* Locations impacted include...
  Wilmington, West Chester, Norristown, Chester, Pottstown,
  Phoenixville, West Norriton, East Norriton, Coatesville, Westtown,
  Downingtown, Conshohocken, Folcroft, Swarthmore, Elsmere, Kennett
  Square, Birdsboro, Collegeville, Royersford and Narberth.

This includes the following highways...
 Pennsylvania Turnpike between mile markers 296 and 335.
 Northeast Extension between mile markers 21 and 25.
 Interstate 95 in Pennsylvania between mile markers 0 and 10.
 Interstate 95 in Delaware between mile markers 15 and 23.
 Interstate 76 in Pennsylvania between mile markers 327 and 335.
 Interstate 295 in New Jersey between mile markers 10 and 15.
 Interstate 476 in Pennsylvania between mile markers 0 and 19.
 Interstate 176 in Pennsylvania between mile markers 1 and 6.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Remain alert for a possible tornado! Tornadoes can develop quickly
from severe thunderstorms. If you spot a tornado go at once into the
basement or small central room in a sturdy structure.

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

&&

LAT...LON 4035 7560 4015 7525 3998 7527 3997 7528
      3996 7527 3976 7529 3973 7589 3997 7586
      4009 7594 4012 7593 4014 7588 4021 7598
TIME...MOT...LOC 1519Z 260DEG 30KT 4016 7586 3995 7578 3974 7586 

TORNADO...POSSIBLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

MLB

2 follow-up statements

533 
WWUS51 KPHI 161541
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
1141 AM EDT Fri Jun 16 2023

DEC003-NJC015-033-PAC011-029-045-091-161600-
/O.CON.KPHI.SV.W.0069.000000T0000Z-230616T1600Z/
New Castle DE-Salem NJ-Gloucester NJ-Berks PA-Montgomery PA-
Chester PA-Delaware PA-
1141 AM EDT Fri Jun 16 2023

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL NOON EDT FOR
NORTHERN NEW CASTLE...NORTHWESTERN SALEM...NORTHWESTERN GLOUCESTER...
SOUTHEASTERN BERKS...SOUTHWESTERN MONTGOMERY...EASTERN CHESTER AND
DELAWARE COUNTIES...

At 1141 AM EDT, severe thunderstorms were located along a line
extending from Pughtown to near West Chester to near Hockessin,
moving east at 35 mph.

HAZARD...60 mph wind gusts and quarter size hail.

SOURCE...Radar indicated.

IMPACT...Minor damage to vehicles is possible. Wind damage to roofs, 
         siding, trees, and power lines is possible.

Locations impacted include...
Wilmington, West Chester, Norristown, Chester, Pottstown,
Phoenixville, West Norriton, East Norriton, Westtown, Downingtown,
Conshohocken, Folcroft, Swarthmore, Kennett Square, Birdsboro,
Collegeville, Royersford, Narberth, Trappe and Schwenksville.

This includes the following highways...
 Pennsylvania Turnpike between mile markers 306 and 335.
 Northeast Extension between mile markers 21 and 25.
 Interstate 95 in Pennsylvania between mile markers 0 and 10.
 Interstate 95 in Delaware between mile markers 15 and 23.
 Interstate 76 in Pennsylvania between mile markers 327 and 335.
 Interstate 295 in New Jersey between mile markers 10 and 15.
 Interstate 476 in Pennsylvania between mile markers 0 and 19.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Remain alert for a possible tornado! Tornadoes can develop quickly
from severe thunderstorms. If you spot a tornado go at once into the
basement or small central room in a sturdy structure.

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

&&

LAT...LON 4035 7560 4015 7525 3998 7527 3997 7528
      3996 7527 3976 7529 3974 7576 4000 7572
      4018 7579 4024 7588
TIME...MOT...LOC 1541Z 259DEG 31KT 4019 7565 3998 7557 3977 7565 

TORNADO...POSSIBLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

MLB

309 
WWUS51 KPHI 161604
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
1204 PM EDT Fri Jun 16 2023

DEC003-NJC015-033-PAC011-029-045-091-161613-
/O.EXP.KPHI.SV.W.0069.000000T0000Z-230616T1600Z/
New Castle DE-Salem NJ-Gloucester NJ-Berks PA-Montgomery PA-
Chester PA-Delaware PA-
1204 PM EDT Fri Jun 16 2023

...THE SEVERE THUNDERSTORM WARNING FOR NORTHERN NEW CASTLE...
NORTHWESTERN SALEM...NORTHWESTERN GLOUCESTER...SOUTHEASTERN BERKS...
SOUTHWESTERN MONTGOMERY...EASTERN CHESTER AND DELAWARE COUNTIES HAS
EXPIRED...
    
The storms which prompted the warning have moved out of the area.
Therefore, the warning has been allowed to expire.

A Severe Thunderstorm Watch remains in effect until 600 PM EDT for
northern Delaware...southern New Jersey...and southeastern
Pennsylvania.

To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
Mount Holly NJ.

Remember, a Severe Thunderstorm Warning still remains in effect for 
New Castle, Salem, Gloucester, Berks, Montgomery, Chester, and 
Delaware Counties until 12:45 PM EDT.

LAT...LON 4035 7560 4015 7525 3998 7527 3997 7528
      3996 7527 3976 7529 3974 7576 4000 7572
      4018 7579 4024 7588
TIME...MOT...LOC 1603Z 270DEG 30KT 4022 7544 4001 7536 3980 7544 

$$

MLB

The office that day

Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 16, 10:26 AM EDT	Special Weather Statement	PHI	Chester	34 min
Jun 16, 10:48 AM EDT	Severe Thunderstorm Warning	PHI	Chester	42 min
Jun 16, 11:02 AM EDT	Special Weather Statement	PHI	Delaware	28 min
Jun 16, 11:10 AM EDT	Tornado Warning	PHI	Berks, Chester	35 min
Jun 16, 11:33 AM EDT	Tornado Warning	PHI	Chester, Delaware, Montgomery	27 min
Jun 16, 11:46 AM EDT	Severe Thunderstorm Warning	PHI	Delaware, Philadelphia	59 min
Jun 16, 11:58 AM EDT	Severe Thunderstorm Warning	PHI	Bucks, Chester, Delaware, Montgomery, Philadelphia	47 min
Jun 16, 12:41 PM EDT	Severe Thunderstorm Warning	PHI	Bucks	49 min
Jun 16, 12:46 PM EDT	Areal Flood Advisory	PHI	Bucks, Delaware, Montgomery, Philadelphia	3 hr
Jun 16, 12:49 PM EDT	Flash Flood Warning	PHI	Bucks, Philadelphia	3 hr
Jun 16, 11:29 AM EDT	Special Weather Statement	PHI	New Castle	31 min
Jun 16, 11:40 AM EDT	Severe Thunderstorm Warning	PHI	Kent, Sussex	50 min
Jun 16, 12:28 PM EDT	Severe Thunderstorm Warning	PHI	Kent, Sussex	47 min
Jun 16, 4:05 PM EDT	Special Weather Statement	PHI	Sussex	25 min
Jun 16, 4:29 PM EDT	Special Weather Statement	PHI	Sussex	46 min
Jun 16, 5:27 PM EDT	Severe Thunderstorm Warning	PHI	Sussex	48 min
Jun 16, 5:45 PM EDT	Areal Flood Advisory	PHI	Sussex	2 hr
Jun 16, 10:39 AM EDT	Special Weather Statement	PHI	Cape May	36 min
Jun 16, 11:01 AM EDT	Special Marine Warning	PHI		44 min
Jun 16, 11:04 AM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Cape May	41 min
Jun 16, 11:43 AM EDT	Special Marine Warning	PHI		62 min
Jun 16, 11:54 AM EDT	Special Marine Warning	PHI		66 min
Jun 16, 12:25 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Burlington, Camden, Cape May, Cumberland, Gloucester and 2 more	65 min
Jun 16, 12:30 PM EDT	Special Marine Warning	PHI		90 min
Jun 16, 12:55 PM EDT	Tornado Warning	PHI	Burlington, Ocean	35 min
Jun 16, 1:13 PM EDT	Special Marine Warning	PHI		2 hr
Jun 16, 1:15 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Burlington, Cape May, Cumberland, Mercer, Middlesex and 2 more	60 min
Jun 16, 1:29 PM EDT	Special Marine Warning	PHI		2 hr
Jun 16, 2:53 PM EDT	Special Marine Warning	PHI		67 min
Jun 16, 3:54 PM EDT	Special Marine Warning	PHI		66 min
Jun 16, 5:07 PM EDT	Special Marine Warning	PHI		53 min
Jun 16, 6:01 PM EDT	Special Marine Warning	PHI		59 min

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 2023 Severe Thunderstorm Warnings in New Jersey, 2023 Severe Thunderstorm Warnings in Delaware, 2023 Every severe thunderstorm warning in 2023

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.