Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 148, NWS Philadelphia/Mount Holly

July 8, 2021Berks County, Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 8, 2021, 4:25 PM EDT for Berks County, Pennsylvania. It was in force for 50 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: Jul 8, 2021, 4:25 PM EDT (20:25 UTC)
Expired: Jul 8, 2021, 5:15 PM EDT
In force: 50 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Berks County, PA

The radar

The Philadelphia radar (KDIX), 154 km from the middle of the area, began a volume at 20:28 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
Jul 8, 2:09 PM EDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 12:00Z, 8.4 hours before the alert went out and 207 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: 272 J/kg
Mixed-layer CIN: -99 J/kg
Mixed-layer LCL: 1291 m above ground
0-6 km bulk shear: 19 kt
0-1 km storm-relative helicity: 18 m²/s²
0-3 km storm-relative helicity: 96 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

500 
WUUS51 KPHI 082025
SVRPHI
PAC011-082115-
/O.NEW.KPHI.SV.W.0148.210708T2025Z-210708T2115Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
425 PM EDT Thu Jul 8 2021

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  Central Berks County in eastern Pennsylvania...

* Until 515 PM EDT.

* At 425 PM EDT, a severe thunderstorm was located over Robesonia, or
  8 miles east of Myerstown, moving northeast at 25 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...
  Hamburg, Fleetwood, Sinking Spring, Laureldale, Womelsdorf,
  Wernersville, Robesonia, Leesport, Shoemakersville, Bernville,
  Fairview Hgts, Spring Ridge, Centerport and Whitfield.

This includes Interstate 78 in Pennsylvania between mile markers 22
and 32.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4056 7611 4057 7608 4058 7606 4058 7604
      4057 7602 4060 7601 4047 7578 4028 7610
      4036 7621 4038 7625
TIME...MOT...LOC 2025Z 221DEG 20KT 4033 7617 

HAIL...1.00IN
WIND...60MPH
 
$$

Staarmann

2 follow-up statements

781 
WWUS51 KPHI 082052
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
452 PM EDT Thu Jul 8 2021

PAC011-082115-
/O.CON.KPHI.SV.W.0148.000000T0000Z-210708T2115Z/
Berks PA-
452 PM EDT Thu Jul 8 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 515 PM EDT
FOR CENTRAL BERKS COUNTY...

At 452 PM EDT, a severe thunderstorm was located over Fairview Hgts,
or 9 miles northwest of Reading, moving northeast at 25 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...
Hamburg, Fleetwood, Leesport, Shoemakersville, Bernville, Fairview
Hgts and Centerport.

This includes Interstate 78 in Pennsylvania between mile markers 27
and 32.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4035 7602 4041 7612 4058 7605 4058 7604
      4057 7602 4060 7601 4047 7578
TIME...MOT...LOC 2052Z 221DEG 20KT 4045 7604 

HAIL...1.00IN
WIND...60MPH
 
$$

Staarmann

403 
WWUS51 KPHI 082106
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
506 PM EDT Thu Jul 8 2021

PAC011-082116-
/O.EXP.KPHI.SV.W.0148.000000T0000Z-210708T2115Z/
Berks PA-
506 PM EDT Thu Jul 8 2021

...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL BERKS COUNTY WILL
EXPIRE AT 515 PM EDT...
                
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning will be allowed to expire.  However small 
hail, gusty winds, and heavy rain are still possible with this 
thunderstorm.

A Severe Thunderstorm Watch remains in effect until 900 PM EDT for
eastern Pennsylvania.

LAT...LON 4035 7602 4041 7612 4058 7605 4058 7604
      4057 7602 4060 7601 4047 7578
TIME...MOT...LOC 2106Z 221DEG 20KT 4050 7598 

$$

Staarmann

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 7, 11:11 PM EDT	Special Weather Statement	PHI	Monroe	49 min
Jul 8, 8:53 AM EDT	Special Weather Statement	PHI	Monroe	52 min
Jul 8, 9:31 AM EDT	Areal Flood Advisory	PHI	Carbon, Monroe	119 min
Jul 8, 9:46 AM EDT	Special Weather Statement	PHI	Monroe	44 min
Jul 8, 1:49 PM EDT	Severe Thunderstorm Warning	PHI	Bucks	41 min
Jul 8, 3:50 PM EDT	Special Weather Statement	PHI	Berks	25 min
Jul 8, 4:06 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Montgomery	39 min
Jul 8, 4:45 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Bucks, Lehigh, Montgomery, Northampton	45 min
Jul 8, 4:51 PM EDT	Severe Thunderstorm Warning	PHI	Berks	54 min
Jul 8, 5:11 PM EDT	Special Weather Statement	PHI	Lehigh	34 min
Jul 8, 5:21 PM EDT	Severe Thunderstorm Warning	PHI	Chester, Delaware, Montgomery, Philadelphia	39 min
Jul 8, 5:29 PM EDT	Special Weather Statement	PHI	Northampton	46 min
Jul 8, 5:52 PM EDT	Special Weather Statement	PHI	Berks	23 min
Jul 8, 6:06 PM EDT	Severe Thunderstorm Warning	PHI	Bucks, Montgomery	39 min
Jul 8, 6:16 PM EDT	Severe Thunderstorm Warning	PHI	Northampton	44 min

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 2021 Every severe thunderstorm warning in 2021

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.