Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2024

Severe Thunderstorm Warning 86, NWS Philadelphia/Mount Holly

June 30, 2024Berks County, Chester County, Montgomery County, Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jun 30, 2024, 4:54 PM EDT for Berks County, Chester County, Montgomery County, Pennsylvania. It was in force for 51 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Jun 30, 2024, 4:54 PM EDT (20:54 UTC)
Expired: Jun 30, 2024, 5:45 PM EDT
In force: 51 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Berks County, PA, Chester County, PA, Montgomery County, PA

The radar

The Philadelphia radar (KDIX), 140 km from the middle of the area, began a volume at 20:56 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.

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 30, 11:09 AM EDT	Severe Thunderstorm Watch	SPC	10 hr

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 12:00Z, 8.9 hours before the alert went out and 195 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: 958 J/kg
Mixed-layer CIN: -163 J/kg
Mixed-layer LCL: 1517 m above ground
0-6 km bulk shear: 23 kt
0-1 km storm-relative helicity: 44 m²/s²
0-3 km storm-relative helicity: 20 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

Open this sounding in Storm Lab

The text

As transmitted.

909 
WUUS51 KPHI 302054
SVRPHI
PAC011-029-091-302145-
/O.NEW.KPHI.SV.W.0086.240630T2054Z-240630T2145Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
454 PM EDT Sun Jun 30 2024

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  Southern Berks County in eastern Pennsylvania...
  Northwestern Montgomery County in southeastern Pennsylvania...
  North central Chester County in southeastern Pennsylvania...

* Until 545 PM EDT.

* At 454 PM EDT, a severe thunderstorm was located near Denver, or
  near Ephrata, moving east at 30 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...
  Reading, Pottstown, Wyomissing, Birdsboro, Sinking Spring,
  Laureldale, Womelsdorf, Wernersville, Robesonia, Elverson,
  Bechtelsville, New Morgan, Spring Ridge, Pughtown, Cedarville,
  Gilbertsville, Stowe, Shillington, West Reading, and Boyertown.

This includes the following highways...
 Pennsylvania Turnpike between mile markers 296 and 299.
 Interstate 176 in Pennsylvania between mile markers 1 and 11.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4042 7562 4015 7561 4015 7590 4031 7614
      4036 7621 4037 7623 4037 7624 4038 7624
TIME...MOT...LOC 2054Z 268DEG 26KT 4028 7617 

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

$$

Hoeflich

2 follow-up statements

086 
WWUS51 KPHI 302127
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
527 PM EDT Sun Jun 30 2024

PAC011-029-091-302145-
/O.CON.KPHI.SV.W.0086.000000T0000Z-240630T2145Z/
Berks PA-Montgomery PA-Chester PA-
527 PM EDT Sun Jun 30 2024

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 545 PM EDT
FOR SOUTHEASTERN BERKS...WESTERN MONTGOMERY AND NORTH CENTRAL CHESTER
COUNTIES...

At 527 PM EDT, a severe thunderstorm was located over Pottstown, or
13 miles east of Reading, moving east at 50 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...
Pottstown, Birdsboro, Elverson, New Morgan, Pughtown, Cedarville,
Gilbertsville, Stowe, Boyertown, St. Lawrence, Lorane, South
Pottstown, Reiffton, Amity Gardens, Kenilworth, Flying Hills, Halfway
House, and Pottsgrove.

This includes the following highways...
 Pennsylvania Turnpike between mile markers 296 and 299.
 Interstate 176 in Pennsylvania between mile markers 1 and 11.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4025 7605 4035 7578 4036 7562 4015 7561
      4015 7590
TIME...MOT...LOC 2127Z 273DEG 42KT 4028 7568 

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

$$

Hoeflich

758 
WWUS51 KPHI 302136
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
536 PM EDT Sun Jun 30 2024

PAC011-029-091-302145-
/O.EXP.KPHI.SV.W.0086.000000T0000Z-240630T2145Z/
Berks PA-Montgomery PA-Chester PA-
536 PM EDT Sun Jun 30 2024

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN BERKS...WESTERN
MONTGOMERY AND NORTH CENTRAL CHESTER COUNTIES WILL EXPIRE AT 545 PM
EDT...

The storm which prompted the warning has weakened below severe
limits, and has exited the warned area. Therefore, the warning will
be allowed to expire.  However gusty winds are still possible with
this thunderstorm.

A Severe Thunderstorm Watch remains in effect until 700 PM EDT for
eastern 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.

LAT...LON 4025 7605 4035 7578 4036 7562 4015 7561
      4015 7590
TIME...MOT...LOC 2135Z 268DEG 26KT 4028 7561 

$$

Hoeflich

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 29, 8:22 PM EDT	Severe Thunderstorm Warning	PHI	Bucks, Montgomery	53 min
Jun 29, 10:23 PM EDT	Flash Flood Warning	PHI	Chester	4 hr
Jun 30, 1:18 PM EDT	Severe Thunderstorm Warning	PHI	Carbon, Monroe	42 min
Jun 30, 1:57 PM EDT	Severe Thunderstorm Warning	PHI	Monroe	48 min
Jun 30, 2:10 PM EDT	Severe Thunderstorm Warning	PHI	Monroe, Northampton	50 min
Jun 30, 2:42 PM EDT	Severe Thunderstorm Warning	PHI	Northampton	63 min
Jun 30, 2:45 PM EDT	Severe Thunderstorm Warning	PHI	Carbon, Lehigh, Monroe, Northampton	45 min
Jun 30, 3:01 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Chester, Montgomery	59 min
Jun 30, 3:26 PM EDT	Severe Thunderstorm Warning	PHI	Northampton	49 min
Jun 30, 3:46 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Bucks, Lehigh, Montgomery	44 min
Jun 30, 3:52 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Chester, Delaware, Montgomery	38 min
Jun 30, 4:25 PM EDT	Severe Thunderstorm Warning	PHI	Bucks, Chester, Delaware, Montgomery, Philadelphia	50 min
Jun 30, 4:37 PM EDT	Severe Thunderstorm Warning	PHI	Bucks, Lehigh, Northampton	53 min
Jun 30, 5:19 PM EDT	Flash Flood Warning	PHI	Chester, Delaware, Philadelphia	3 hr
Jun 30, 5:20 PM EDT	Severe Thunderstorm Warning	PHI	Chester, Delaware	40 min
Jun 30, 5:51 PM EDT	Severe Thunderstorm Warning	PHI	Delaware, Philadelphia	39 min
Jun 30, 5:54 PM EDT	Flash Flood Warning	PHI	Delaware, Philadelphia	3 hr
Jun 30, 7:31 PM EDT	Severe Thunderstorm Warning	PHI	Chester	44 min

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 2024 Every severe thunderstorm warning in 2024

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.