Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2023

Severe Thunderstorm Warning 307, NWS Philadelphia/Mount Holly

September 7, 20234 counties in Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Sep 7, 2023, 5:17 PM EDT for 4 counties in Pennsylvania. It was in force for 43 min. 5 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: Sep 7, 2023, 5:17 PM EDT (21:17 UTC)
Expired: Sep 7, 2023, 6:00 PM EDT
In force: 43 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Berks County, PA, Carbon County, PA, Lehigh County, PA, Monroe County, PA

The radar

The Philadelphia radar (KDIX), 150 km from the middle of the area, began a volume at 21:20 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
Sep 7, 5:20 PM EDT	TSTM WND DMG	2 Sw Lowhill Twp, PA	JCPL reports tree damage resulting in power outages along Weisenberg Church Road. Time estimated from radar.
Sep 7, 5:23 PM EDT	TSTM WND DMG	2 Nnw New Tripoli, PA	Downed tree in wires. Time estimated from radar.
Sep 7, 5:23 PM EDT	TSTM WND DMG	Heidelberg Twp, PA	Downed tree on wires at Werleys Corner Road and Bake Oven Road. Time estimated from radar.
Sep 7, 5:23 PM EDT	HAIL 0.75	1 Wnw Fleetwood, PA	Report from mPING: Dime (0.75 in.).
Sep 7, 5:44 PM EDT	HAIL 0.5	Oley, PA	Picture and video of estimated half-inch hail.

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
Sep 7, 1:14 PM EDT	Severe Thunderstorm Watch	SPC	8 hr

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 12:00Z, 9.3 hours before the alert went out and 245 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.

216 
WUUS51 KPHI 072117
SVRPHI
PAC011-025-077-089-072200-
/O.NEW.KPHI.SV.W.0307.230907T2117Z-230907T2200Z/

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

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  Central Berks County in eastern Pennsylvania...
  Northwestern Lehigh County in eastern Pennsylvania...
  Carbon County in northeastern Pennsylvania...
  West central Monroe County in northeastern Pennsylvania...

* Until 600 PM EDT.

* At 517 PM EDT, severe thunderstorms were located along a line
  extending from near Penobscot to near Wanamakers to near Adamstown,
  moving northeast at 20 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, Lehighton, Wyomissing, Palmerton, Birdsboro, Kutztown, Jim
  Thorpe, Slatington, Fleetwood, Sinking Spring, Laureldale,
  Nesquehoning, Weatherly, Wernersville, Walnutport, Topton,
  Leesport, Shoemakersville, Lyons and Lenhartsville.

This includes the following highways...
 Northeast Extension between mile markers 65 and 97.
 Interstate 78 in Pennsylvania between mile markers 35 and 48.
 Interstate 80 in Pennsylvania between mile markers 277 and 286.
 Interstate 176 in Pennsylvania between mile markers 9 and 11.

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 4071 7560 4026 7581 4027 7608 4029 7611
      4058 7593 4067 7593 4074 7576 4085 7593
      4094 7592 4101 7573 4105 7577 4108 7577
      4113 7569 4112 7564 4117 7559
TIME...MOT...LOC 2117Z 242DEG 18KT 4111 7585 4062 7585 4027 7605 

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

$$

MPS

1 follow-up statement

873 
WWUS51 KPHI 072151
SVSPHI

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

PAC011-025-077-089-072200-
/O.EXP.KPHI.SV.W.0307.000000T0000Z-230907T2200Z/
Berks PA-Lehigh PA-Carbon PA-Monroe PA-
551 PM EDT Thu Sep 7 2023

...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL BERKS...NORTHWESTERN
LEHIGH...CARBON AND WEST CENTRAL MONROE COUNTIES WILL EXPIRE AT 600
PM EDT...
    
The storms which prompted the warning have moved out of the area.
Therefore, the warning will be allowed to expire.  However small
hail, gusty winds and heavy rain are still possible with these
thunderstorms.

A Severe Thunderstorm Watch remains in effect until 900 PM EDT for
eastern and northeastern 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 
portions of Lehigh, Carbon, and Monroe counties until 6:30 PM.

LAT...LON 4071 7560 4026 7581 4027 7608 4029 7611
      4058 7593 4067 7593 4074 7576 4085 7593
      4094 7592 4101 7573 4105 7577 4108 7577
      4113 7569 4112 7564 4117 7559
TIME...MOT...LOC 2150Z 242DEG 18KT 4119 7566 4070 7566 4035 7586 

$$

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, 5:30 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Chester	31 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.