Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2022

Severe Thunderstorm Warning 142, NWS Philadelphia/Mount Holly

July 28, 2022Chester County, Delaware County, Montgomery County, Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 28, 2022, 7:29 PM EDT for Chester County, Delaware County, Montgomery County, Pennsylvania. It was in force for 46 min. 7 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
Jul 28, 2022, 7:29 PM EDT (23:29 UTC)
Expired
Jul 28, 2022, 8:15 PM EDT
In force
46 min
Issued by
NWS Philadelphia/Mount Holly
Area
Storm-based polygon
Hail
0.75 in
Wind
60.0 mph

Counties Chester County, PA, Delaware County, PA, Montgomery County, PA

The radar

The Philadelphia radar (KDIX), 118 km from the middle of the area, began a volume at 23:31 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.

What was reported inside it

TimeReportWhereRemark
Jul 28, 7:55 PM EDTTSTM WND DMGEast Pikeland Twp, PAREPORT OF TREE BRANCH DOWN ON WIRE, EMERGENCY SERVICES SENT TO ADDRESS. TIME ESTIMATED FROM RADAR.
Jul 28, 7:55 PM EDTTSTM WND DMGWest Bradford Twp, PAREPORT OF WIRES DOWN RELAYED BY COUNTY 911 CENTER. TIME ESTIMATED FROM RADAR.
Jul 28, 7:59 PM EDTTSTM WND DMGChester Springs, PAREPORT OF TREE DOWN, PARTIALLY BLOCKING THE ROAD ON ROUTE 113 BETWEEN KIMBERTON AND LIONVILLE ON SOCIAL MEDIA. TIME ESTIMATED FROM RADAR.
Jul 28, 8:08 PM EDTTSTM WND DMGMalvern, PAREPORT FROM SOCIAL MEDIA OF TREE DOWN ON KING RD. TIME ESTIMATED FROM RADAR.
Jul 28, 8:08 PM EDTTSTM WND DMGWest Goshen, PAREPORT ON SOCIAL MEDIA OF 6 INCH LIMBS DOWN AT ELLIS LN & STRASBURG RD. TIME ESTIMATED FROM RADAR.
Jul 28, 8:21 PM EDTTSTM WND DMG1 Wsw Upper Providence, PAUS-1 SOUTH WAS CLOSED BETWEEN THE PA-252 EXIT AND THE INTERSECTION OF BALTIMORE PIKE DUE TO A DOWNED TREE. TIME ESTIMATED FROM RADAR.
Jul 28, 8:21 PM EDTTSTM WND DMG1 Wsw Upper Providence, PAUS-1 SOUTH WAS CLOSE DUE TO A DOWNED TREE. TIME ESTIMATED FROM RADAR.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 12:00Z, 11.5 hours before the alert went out and 185 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-pSkew-T log-p diagram, Washington/Dulle, VA at 12:00Z on 2022-07-28Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 135 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Washington/Dulle, VA at 12:00Z on 2022-07-28The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 11 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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
135 J/kg
Mixed-layer CIN
-70 J/kg
Mixed-layer LCL
1125 m above ground
0-6 km bulk shear
39 kt
0-1 km storm-relative helicity
11 m²/s²
0-3 km storm-relative helicity
26 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

313 
WUUS51 KPHI 282329
SVRPHI
PAC029-045-091-290015-
/O.NEW.KPHI.SV.W.0142.220728T2329Z-220729T0015Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
729 PM EDT Thu Jul 28 2022

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  South central Montgomery County in southeastern Pennsylvania...
  Central Chester County in southeastern Pennsylvania...
  Northwestern Delaware County in southeastern Pennsylvania...

* Until 815 PM EDT.

* At 729 PM EDT, a severe thunderstorm was located near Honey Brook,
  or 8 miles southeast of New Holland, moving east at 40 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

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

* Locations impacted include...
  West Chester, Phoenixville, West Norriton, Coatesville, Westtown,
  Downingtown, Parkesburg, Honey Brook, Elverson, Cheyney,
  Marshallton, Lima, Lionville-Marchwood, Gradyville, Valley Forge,
  Glenmoore, Paoli, Chester Springs, Newtown Square and Lionville.

This includes the following highways...
 Pennsylvania Turnpike between mile markers 300 and 327.
 Interstate 76 in Pennsylvania near mile marker 327.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4004 7593 4011 7594 4014 7587 4015 7586
      4016 7539 3987 7540 3995 7599
TIME...MOT...LOC 2329Z 273DEG 34KT 4005 7593 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

RCM
2 follow-up statements
353 
WWUS51 KPHI 282353
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
753 PM EDT Thu Jul 28 2022

PAC029-045-091-290015-
/O.CON.KPHI.SV.W.0142.000000T0000Z-220729T0015Z/
Montgomery PA-Chester PA-Delaware PA-
753 PM EDT Thu Jul 28 2022

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 815 PM EDT
FOR SOUTH CENTRAL MONTGOMERY...NORTHEASTERN CHESTER AND CENTRAL
DELAWARE COUNTIES...

At 753 PM EDT, a severe thunderstorm was located over Lionville, or
near West Chester, moving east at 40 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

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

Locations impacted include...
West Chester, Phoenixville, West Norriton, Coatesville, Westtown,
Downingtown, Cheyney, Marshallton, Lima, Lionville-Marchwood,
Gradyville, Valley Forge, Glenmoore, Paoli, Chester Springs, Newtown
Square, Lionville, King Of Prussia, Radnor Township and West Goshen.

This includes the following highways...
 Pennsylvania Turnpike between mile markers 304 and 327.
 Interstate 76 in Pennsylvania near mile marker 327.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4002 7583 4007 7580 4012 7579 4015 7580
      4016 7539 3987 7540 3994 7589
TIME...MOT...LOC 2353Z 272DEG 33KT 4004 7568 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

RCM
332 
WWUS51 KPHI 290006
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
806 PM EDT Thu Jul 28 2022

PAC029-045-091-290015-
/O.CON.KPHI.SV.W.0142.000000T0000Z-220729T0015Z/
Montgomery PA-Chester PA-Delaware PA-
806 PM EDT Thu Jul 28 2022

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 815 PM EDT
FOR SOUTH CENTRAL MONTGOMERY...NORTHEASTERN CHESTER AND CENTRAL
DELAWARE COUNTIES...

At 806 PM EDT, a severe thunderstorm was located over Paoli, or near
West Chester, moving east at 40 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

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

Locations impacted include...
West Chester, Phoenixville, West Norriton, Westtown, Downingtown,
Cheyney, Marshallton, Lima, Lionville-Marchwood, Gradyville, Valley
Forge, Paoli, Chester Springs, Newtown Square, Lionville, King Of
Prussia, Radnor Township, West Goshen, Brookhaven and Malvern.

This includes the following highways...
 Pennsylvania Turnpike between mile markers 312 and 327.
 Interstate 76 in Pennsylvania near mile marker 327.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3999 7574 4005 7568 4010 7567 4015 7569
      4016 7539 3987 7540 3993 7579
TIME...MOT...LOC 0006Z 273DEG 34KT 4003 7552 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

RCM

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 28, 3:31 PM EDTSpecial Weather StatementPHIBerks, Lehigh, Northampton29 min
Jul 28, 3:32 PM EDTSpecial Weather StatementPHIChester, Montgomery28 min
Jul 28, 4:01 PM EDTSpecial Weather StatementPHIBerks, Lehigh, Northampton29 min
Jul 28, 4:02 PM EDTSpecial Weather StatementPHIChester, Delaware28 min
Jul 28, 4:32 PM EDTSpecial Weather StatementPHINorthampton28 min
Jul 28, 4:32 PM EDTSpecial Weather StatementPHIBerks28 min
Jul 28, 4:34 PM EDTSpecial Weather StatementPHILehigh26 min
Jul 28, 5:01 PM EDTSpecial Weather StatementPHIBerks, Lehigh29 min
Jul 28, 5:30 PM EDTSpecial Weather StatementPHILehigh30 min
Jul 28, 5:38 PM EDTSevere Thunderstorm WarningPHIBerks, Bucks, Montgomery52 min
Jul 28, 6:27 PM EDTSpecial Weather StatementPHIMontgomery, Philadelphia33 min
Jul 28, 6:29 PM EDTSpecial Weather StatementPHIChester31 min
Jul 28, 7:07 PM EDTSpecial Weather StatementPHIPhiladelphia23 min
Jul 28, 7:15 PM EDTSpecial Weather StatementPHIChester30 min

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 2022Every severe thunderstorm warning in 2022

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.