Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 28, NWS Philadelphia/Mount Holly

May 26, 2021Berks County, Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at May 26, 2021, 3:39 PM EDT for Berks County, Pennsylvania. It was in force for 56 min. 2 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: May 26, 2021, 3:39 PM EDT (19:39 UTC)
Expired: May 26, 2021, 4:35 PM EDT
In force: 56 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

County Berks County, PA

The radar

The Philadelphia radar (KDIX), 161 km from the middle of the area, began a volume at 19:43 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
May 26, 4:11 PM EDT	TSTM WND DMG	1 W Hamburg, PA	POWER POLE SNAPPED ON HOLLY ROAD. TIME ESTIMATED FROM RADAR.
May 26, 4:13 PM EDT	TSTM WND DMG	2 Sse Penn Twp, PA	DOWNED TREE LIMBS AND WIRES NEAR GARFIELD ROAD. TIME ESTIMATED FROM RADAR.

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
May 26, 2:48 PM EDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 12:00Z, 7.7 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: 478 J/kg
Mixed-layer CIN: -132 J/kg
Mixed-layer LCL: 922 m above ground
0-6 km bulk shear: 28 kt
0-1 km storm-relative helicity: 35 m²/s²
0-3 km storm-relative helicity: 50 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

Open this sounding in Storm Lab

The text

As transmitted.

704 
WUUS51 KPHI 261939
SVRPHI
PAC011-262045-
/O.NEW.KPHI.SV.W.0028.210526T1939Z-210526T2045Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
339 PM EDT Wed May 26 2021

The National Weather Service in Mount Holly NJ has issued a

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

* Until 445 PM EDT.

* At 338 PM EDT, a severe thunderstorm was located over Lickdale, or
  9 miles north of Lebanon, moving east at 25 mph.

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

  SOURCE...Radar indicated.

  IMPACT...Damage to roofs, siding, trees, and power lines is 
           possible.

* Locations impacted include...
  Hamburg, Bernville, Strausstown, Fairview Hgts and Centerport. 

This includes Interstate 78 in Pennsylvania between mile markers 10
and 32.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

Protecting yourself from immediate threats to life and safety shall
take priority.  Whenever possible, as long as it does not cause
greater harm, all COVID-19 protective action guidance should be
followed.

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

&&

LAT...LON 4052 7634 4052 7625 4056 7609 4058 7606
      4057 7602 4063 7600 4066 7595 4065 7594
      4035 7603 4038 7625 4049 7643
TIME...MOT...LOC 1938Z 261DEG 20KT 4048 7648 

HAIL...0.75IN
WIND...60MPH
 
$$

Meola

2 follow-up statements

709 
WWUS51 KPHI 262010
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
410 PM EDT Wed May 26 2021

PAC011-262045-
/O.CON.KPHI.SV.W.0028.000000T0000Z-210526T2045Z/
Berks PA-
410 PM EDT Wed May 26 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 445 PM EDT
FOR NORTHWESTERN BERKS COUNTY...

At 409 PM EDT, severe thunderstorms were located along a line
extending from near Hamburg to near Myerstown, moving east at 30 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...Damage to roofs, siding, trees, and power lines is 
         possible.

Locations impacted include...
Hamburg, Bernville, Strausstown, Fairview Hgts and Centerport. 

This includes Interstate 78 in Pennsylvania between mile markers 10
and 32.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

Protecting yourself from immediate threats to life and safety shall
take priority.  Whenever possible, as long as it does not cause
greater harm, all COVID-19 protective action guidance should be
followed.

Frequent cloud to ground lightning is occurring with these storms.
Move indoors immediately. Lightning is one of nature's leading
killers. Remember, if you can hear thunder, you are close enough to
be struck by lightning.

&&

LAT...LON 4052 7634 4052 7625 4056 7609 4058 7606
      4057 7602 4063 7600 4066 7595 4065 7594
      4035 7603 4038 7625 4049 7643
TIME...MOT...LOC 2009Z 277DEG 27KT 4055 7607 4034 7632 

HAIL...<.75IN
WIND...60MPH
 
$$

Deal

119 
WWUS51 KPHI 262035
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
435 PM EDT Wed May 26 2021

PAC011-262043-
/O.CAN.KPHI.SV.W.0028.000000T0000Z-210526T2045Z/
Berks PA-
435 PM EDT Wed May 26 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN BERKS COUNTY IS
CANCELLED...
    
The storms which prompted the warning have weakened below severe
limits, and have exited the warned area. Therefore, the warning has 
been cancelled. However gusty winds are still possible with these 
thunderstorms.

A Severe Thunderstorm Watch remains in effect until 1000 PM EDT for
eastern Pennsylvania.

Remember, a Severe Thunderstorm Warning still remains in effect for 
portions of eastern Berks county through 515 pm.

LAT...LON 4052 7634 4052 7625 4056 7609 4058 7606
      4057 7602 4063 7600 4066 7595 4065 7594
      4035 7603 4038 7625 4049 7643
TIME...MOT...LOC 2031Z 261DEG 20KT 4057 7591 4036 7616 

$$

Deal

The office that day

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

Issued	Product	Office	Counties	Lasted
May 26, 4:10 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Lehigh	65 min
May 26, 4:46 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Bucks, Chester, Lehigh, Montgomery, Northampton	44 min
May 26, 4:52 PM EDT	Severe Thunderstorm Warning	PHI	Chester, Delaware, Montgomery	38 min
May 26, 5:27 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Bucks, Chester, Delaware, Montgomery, Philadelphia	48 min
May 26, 5:34 PM EDT	Severe Thunderstorm Warning	PHI	Northampton	41 min
May 26, 5:37 PM EDT	Severe Thunderstorm Warning	PHI	Chester	53 min
May 26, 5:53 PM EDT	Severe Thunderstorm Warning	PHI	Bucks, Montgomery, Philadelphia	67 min
May 26, 6:52 PM EDT	Severe Thunderstorm Warning	PHI	Berks	38 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.