Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2019

Severe Thunderstorm Warning 63, NWS Philadelphia/Mount Holly

May 28, 20194 counties in Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at May 28, 2019, 6:16 PM EDT for 4 counties in Pennsylvania. It was in force for 44 min. 1 report 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 28, 2019, 6:16 PM EDT (22:16 UTC)
Expired: May 28, 2019, 7:00 PM EDT
In force: 44 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Berks County, PA, Bucks County, PA, Lehigh County, PA, Montgomery County, PA

The radar

The Philadelphia radar (KDIX), 123 km from the middle of the area, began a volume at 22:20 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
May 28, 6:33 PM EDT	TSTM WND DMG	1 S Douglass Twp, PA	DOWNED TREE AND WIRES ON RED SHALE DRIVE. 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 28, 1:48 PM EDT	Tornado Watch	SPC	8 hr

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 12:00Z, 10.3 hours before the alert went out and 216 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: 35 J/kg
Mixed-layer CIN: -149 J/kg
Mixed-layer LCL: 1167 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 293 m²/s²
0-3 km storm-relative helicity: 414 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

The text

As transmitted.

063 
WUUS51 KPHI 282216
SVRPHI
PAC011-017-077-091-282300-
/O.NEW.KPHI.SV.W.0063.190528T2216Z-190528T2300Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
616 PM EDT Tue May 28 2019

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  East central Berks County in eastern Pennsylvania...
  Northwestern Montgomery County in southeastern Pennsylvania...
  South central Lehigh County in eastern Pennsylvania...
  Northwestern Bucks County in southeastern Pennsylvania...

* Until 700 PM EDT.

* At 616 PM EDT, a severe thunderstorm was located over Leesport, or
  7 miles north of Reading, moving east at 40 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, Quakertown, Collegeville, Fleetwood,
  Laureldale, Trappe, East Greenville, Leesport, Schwenksville,
  Bally, Bechtelsville, Green Lane, Lyons, Spring Mount, Fairview
  Hgts, Geryville, Gilbertsville, Skippack and Stowe.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A tornado watch remains in effect until 1000 PM EDT for eastern and
southeastern Pennsylvania.

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

In addition to large hail and damaging winds, frequent cloud to
ground lightning is occurring with this storm. Move indoors
immediately. Remember, if you can hear thunder, you are close enough
to be struck by lightning.

&&

LAT...LON 4051 7594 4043 7533 4016 7542 4041 7603
TIME...MOT...LOC 2216Z 289DEG 36KT 4043 7593 

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

Gorse

3 follow-up statements

853 
WWUS51 KPHI 282230
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
630 PM EDT Tue May 28 2019

PAC011-017-077-091-282300-
/O.CON.KPHI.SV.W.0063.000000T0000Z-190528T2300Z/
Berks PA-Montgomery PA-Lehigh PA-Bucks PA-
630 PM EDT Tue May 28 2019

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 700 PM EDT
FOR EAST CENTRAL BERKS...NORTHWESTERN MONTGOMERY...SOUTHEASTERN
LEHIGH AND NORTHWESTERN BUCKS COUNTIES...

At 630 PM EDT, a severe thunderstorm was located near Bechtelsville,
or 11 miles east of Reading, moving southeast 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, Quakertown, Collegeville, Trappe, East Greenville,
Schwenksville, Bally, Bechtelsville, Green Lane, Geryville, Spring
Mount, Gilbertsville, Skippack, Stowe, Boyertown, Pennsburg, Red
Hill, Trumbauersville, Harleysville and Pottsgrove.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A tornado watch remains in effect until 1000 PM EDT for eastern and
southeastern Pennsylvania.

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

Frequent cloud to ground lightning is occurring with this storm.
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 4047 7572 4043 7533 4016 7542 4033 7584
TIME...MOT...LOC 2230Z 294DEG 45KT 4034 7571 

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

Gorse

235 
WWUS51 KPHI 282248
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
648 PM EDT Tue May 28 2019

PAC011-017-077-282257-
/O.CAN.KPHI.SV.W.0063.000000T0000Z-190528T2300Z/
Berks PA-Lehigh PA-Bucks PA-
648 PM EDT Tue May 28 2019

...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL BERKS...
SOUTHEASTERN LEHIGH AND NORTHWESTERN BUCKS COUNTIES IS CANCELLED...
    
The severe thunderstorm which prompted the warning has moved out of 
the warned area. Therefore, the warning has been cancelled.

A tornado watch remains in effect until 1000 PM EDT for southeastern
Pennsylvania.

LAT...LON 4034 7551 4032 7538 4016 7542 4025 7564
TIME...MOT...LOC 2247Z 298DEG 49KT 4021 7548 

$$

PAC091-282300-
/O.CON.KPHI.SV.W.0063.000000T0000Z-190528T2300Z/
Montgomery PA-
648 PM EDT Tue May 28 2019

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 700 PM EDT
FOR WEST CENTRAL MONTGOMERY COUNTY...

At 647 PM EDT, a severe thunderstorm was located over Trappe, or 18
miles north of West Chester, moving southeast at 55 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, Collegeville, Trappe, Schwenksville, Green Lane, Spring
Mount, Skippack, Sanatoga, Pottsgrove, Evansburg, Harleysville and
Eagleville.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A tornado watch remains in effect until 1000 PM EDT for southeastern
Pennsylvania.

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

Frequent cloud to ground lightning is occurring with this storm.
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 4034 7551 4032 7538 4016 7542 4025 7564
TIME...MOT...LOC 2247Z 298DEG 49KT 4021 7548 

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

Gorse

486 
WWUS51 KPHI 282255
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
655 PM EDT Tue May 28 2019

PAC091-282305-
/O.EXP.KPHI.SV.W.0063.000000T0000Z-190528T2300Z/
Montgomery PA-
655 PM EDT Tue May 28 2019

...THE SEVERE THUNDERSTORM WARNING FOR WEST CENTRAL MONTGOMERY COUNTY
WILL EXPIRE AT 700 PM EDT...
        
The storm which prompted the warning has moved out of the area.
Therefore, the warning will be allowed to expire.

A tornado watch remains in effect until 1000 PM EDT for southeastern
Pennsylvania.

LAT...LON 4034 7551 4032 7538 4016 7542 4025 7564
TIME...MOT...LOC 2255Z 289DEG 36KT 4019 7539 

$$

Gorse

The office that day

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

Issued	Product	Office	Counties	Lasted
May 28, 4:27 PM EDT	Severe Thunderstorm Warning	PHI	Berks	63 min
May 28, 4:56 PM EDT	Special Weather Statement	PHI	Chester	49 min
May 28, 5:08 PM EDT	Severe Thunderstorm Warning	PHI	Berks	67 min
May 28, 5:22 PM EDT	Tornado Warning	PHI	Berks	23 min
May 28, 5:36 PM EDT	Severe Thunderstorm Warning	PHI	Berks	39 min
May 28, 5:45 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Chester	45 min
May 28, 6:03 PM EDT	Areal Flood Advisory	PHI	Berks	2 hr
May 28, 6:09 PM EDT	Tornado Warning	PHI	Chester	36 min
May 28, 6:11 PM EDT	Severe Thunderstorm Warning	PHI	Chester	64 min
May 28, 6:14 PM EDT	Areal Flood Advisory	PHI	Chester	4 hr
May 28, 6:24 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Chester, Delaware	48 min
May 28, 6:41 PM EDT	Severe Thunderstorm Warning	PHI	Monroe	64 min
May 28, 6:52 PM EDT	Severe Thunderstorm Warning	PHI	Chester, Delaware, Montgomery, Philadelphia	38 min
May 28, 7:00 PM EDT	Areal Flood Advisory	PHI	Delaware, Philadelphia	3 hr
May 28, 7:42 PM EDT	Severe Thunderstorm Warning	PHI	Monroe	63 min
May 28, 7:59 PM EDT	Areal Flood Advisory	PHI	Monroe	2 hr

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 2019 Every severe thunderstorm warning in 2019

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.