Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2023

Severe Thunderstorm Warning 308, NWS Philadelphia/Mount Holly

September 7, 2023Berks County, Chester County, Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Sep 7, 2023, 5:30 PM EDT for Berks County, Chester County, Pennsylvania. It was in force for 31 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: Sep 7, 2023, 5:30 PM EDT (21:30 UTC)
Expired: Sep 7, 2023, 6:01 PM EDT
In force: 31 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

The radar

The Philadelphia radar (KDIX), 130 km from the middle of the area, began a volume at 21:31 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
Sep 7, 1:14 PM EDT	Severe Thunderstorm Watch	SPC	8 hr

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 12:00Z, 9.5 hours before the alert went out and 184 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: 2091 J/kg
Mixed-layer CIN: -73 J/kg
Mixed-layer LCL: 1114 m above ground
0-6 km bulk shear: 15 kt
0-1 km storm-relative helicity: 5 m²/s²
0-3 km storm-relative helicity: 27 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

459 
WUUS51 KPHI 072130
SVRPHI
PAC011-029-072215-
/O.NEW.KPHI.SV.W.0308.230907T2130Z-230907T2215Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
530 PM EDT Thu Sep 7 2023

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  South central Berks County in eastern Pennsylvania...
  Northwestern Chester County in southeastern Pennsylvania...

* Until 615 PM EDT.

* At 530 PM EDT, a severe thunderstorm was located near Churchtown,
  or near New Holland, moving northeast at 15 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...
  Honey Brook, Elverson, New Morgan, Glenmoore and Flying Hills. 

This includes the following highways...
 Pennsylvania Turnpike between mile markers 296 and 308.
 Interstate 176 in Pennsylvania between mile markers 1 and 8.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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

&&

LAT...LON 4028 7593 4010 7570 3997 7599 4004 7593
      4011 7594 4014 7588 4022 7600
TIME...MOT...LOC 2130Z 230DEG 14KT 4009 7600 

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

$$

MPS

2 follow-up statements

917 
WWUS51 KPHI 072154
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
554 PM EDT Thu Sep 7 2023

PAC011-029-072215-
/O.CON.KPHI.SV.W.0308.000000T0000Z-230907T2215Z/
Berks PA-Chester PA-
554 PM EDT Thu Sep 7 2023

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 615 PM EDT
FOR SOUTH CENTRAL BERKS AND NORTH CENTRAL CHESTER COUNTIES...

At 553 PM EDT, a severe thunderstorm was located over New Morgan, or
9 miles south of Reading, moving northeast 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...
Elverson, New Morgan and Flying Hills. 

This includes the following highways...
 Pennsylvania Turnpike between mile markers 296 and 304.
 Interstate 176 in Pennsylvania between mile markers 1 and 8.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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

&&

LAT...LON 4008 7584 4012 7591 4014 7588 4022 7600
      4028 7593 4015 7576
TIME...MOT...LOC 2153Z 216DEG 28KT 4020 7588 

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

$$

MPS

378 
WWUS51 KPHI 072201
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
601 PM EDT Thu Sep 7 2023

PAC011-029-072211-
/O.CAN.KPHI.SV.W.0308.000000T0000Z-230907T2215Z/
Berks PA-Chester PA-
601 PM EDT Thu Sep 7 2023

...THE SEVERE THUNDERSTORM WARNING FOR SOUTH CENTRAL BERKS AND NORTH
CENTRAL CHESTER COUNTIES IS CANCELLED...
        
The storm which prompted the warning has moved out of the area.
Therefore, the warning has been cancelled.

A Severe Thunderstorm Watch remains in effect until 900 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 4008 7584 4012 7591 4014 7588 4022 7600
      4028 7593 4015 7576
TIME...MOT...LOC 2157Z 230DEG 14KT 4022 7585 

$$

MPS

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 7, 1:10 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Lehigh	33 min
Sep 7, 1:38 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Lehigh	19 min
Sep 7, 2:10 PM EDT	Severe Thunderstorm Warning	PHI	Monroe, Northampton	50 min
Sep 7, 2:13 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Lehigh	47 min
Sep 7, 2:52 PM EDT	Severe Thunderstorm Warning	PHI	Monroe, Northampton	24 min
Sep 7, 4:35 PM EDT	Special Weather Statement	PHI	Berks	25 min
Sep 7, 4:47 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Carbon, Lehigh	43 min
Sep 7, 5:17 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Carbon, Lehigh, Monroe	43 min
Sep 7, 5:34 PM EDT	Severe Thunderstorm Warning	PHI	Carbon, Lehigh, Monroe, Northampton	41 min
Sep 7, 5:44 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Chester, Lehigh, Montgomery, Northampton	46 min
Sep 7, 5:48 PM EDT	Severe Thunderstorm Warning	PHI	Chester	42 min
Sep 7, 5:57 PM EDT	Severe Thunderstorm Warning	PHI	Lehigh, Monroe, Northampton	34 min
Sep 7, 6:06 PM EDT	Special Weather Statement	PHI	Bucks, Montgomery	24 min
Sep 7, 6:18 PM EDT	Severe Thunderstorm Warning	PHI	Chester, Delaware, Montgomery	42 min
Sep 7, 6:24 PM EDT	Severe Thunderstorm Warning	PHI	Bucks, Lehigh, Monroe, Northampton	24 min
Sep 7, 7:00 PM EDT	Special Weather Statement	PHI	Montgomery	30 min
Sep 7, 7:36 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Chester	39 min

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.