Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 49, NWS Philadelphia/Mount Holly

June 3, 20206 counties in Pennsylvania; Hunterdon County, New Jersey

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jun 3, 2020, 11:38 AM EDT for 6 counties in Pennsylvania; Hunterdon County, New Jersey. It was in force for 37 min. 42 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: Jun 3, 2020, 11:38 AM EDT (15:38 UTC)
Expired: Jun 3, 2020, 12:15 PM EDT
In force: 37 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Hail: 0.75 in
Wind: 80.0 mph

Counties Hunterdon County, NJ, Berks County, PA, Bucks County, PA, Chester County, PA, Lehigh County, PA, Montgomery County, PA, Northampton County, PA

The radar

The Philadelphia radar (KDIX), 90 km from the middle of the area, began a volume at 15:38 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
Jun 3, 11:38 AM EDT	TSTM WND DMG	1 Sse Laureldale, PA	DOWNED TREE IN WIRES ON STATE HIGHWAY 12 NEAR THE 11TH STREET INTERCHANGE. TIME ESTIMATED.
Jun 3, 11:38 AM EDT	TSTM WND DMG	2 Ese Laureldale, PA	DOWNED TREE IN WIRES ON STATE HIGHWAY 12 NEAR SPRING VALLEY ROAD. TIME ESTIMATED.
Jun 3, 11:39 AM EDT	TSTM WND DMG	2 Sse South Heidelberg, PA	DOWNED TREE IN WIRES. TIME ESTIMATED.
Jun 3, 11:40 AM EDT	TSTM WND DMG	1 N Spring Twp, PA	TREE DOWN ONTO A HOUSE ON EAST COURT BOULEVARD. TIME ESTIMATED.
Jun 3, 11:40 AM EDT	TSTM WND DMG	2 N West Lawn, PA	SEVERAL REPORTS OF TREES AND WIRES DOWN IN SPRING RIDGE AND WEST LAWN.
Jun 3, 11:40 AM EDT	TSTM WND DMG	Spring Twp, PA	DOWNED TREE AND WIRES ON CLEVELAND AVENUE.
Jun 3, 11:40 AM EDT	TSTM WND DMG	Wyomissing, PA	LARGE TREE DOWNED IN WYOMISSING. REPORT VIA SOCIAL MEDIA WITH VIDEO. TIME ESTIMATED FROM RADAR.
Jun 3, 11:42 AM EDT	TSTM WND DMG	Laureldale, PA	WIDESPREAD POWER OUTAGES WITH NUMEROUS REPORTS OF POWER LINES AND TREES DOWN.
Jun 3, 11:42 AM EDT	TSTM WND DMG	West Wyomissing, PA	SEVERAL REPORTS OF TREES AND POWER LINES DOWN.
Jun 3, 11:45 AM EDT	TSTM WND DMG	1 Nnw Muhlenberg Twp, PA	BUILDING COLLAPSE CAUSED BY TREE FALLING INTO A HOUSE.
Jun 3, 11:45 AM EDT	TSTM WND GST 60	1 Ssw Ruscombmanor Twp, PA
Jun 3, 11:50 AM EDT	TSTM WND DMG	2 Ne Mount Penn, PA	SEVERAL REPORTS OF TREES AND POWER LINES DOWN.
Jun 3, 11:50 AM EDT	TSTM WND DMG	2 Sse Zionsville, PA	CORRECTS PREVIOUS TSTM WND DMG REPORT FROM 2 SSE ZIONSVILLE. DOWNED TREE IN WIRES NEAR THE INTERSECTION OF PALM ROAD AND KINGS HIGHWAY SOUTH. TIME ESTIMATED.
Jun 3, 11:50 AM EDT	TSTM WND DMG	Alburtis, PA	SEVERAL REPORTS OF TREES AND POWER LINES DOWN.
Jun 3, 11:50 AM EDT	TSTM WND DMG	Douglassville, PA	LARGE TREE DOWN NEAR YELLOW HOUSE HOTEL. TIME ESTIMATED.
Jun 3, 11:50 AM EDT	TSTM WND DMG	Kenhorst, PA	SEVERAL REPORTS OF TREE AND POWER LINE DAMAGE.
Jun 3, 11:51 AM EDT	TSTM WND DMG	2 Ene Hereford Twp, PA	CORRECTS PREVIOUS TSTM WND DMG REPORT FROM 2 ENE HEREFORD TWP. DOWNED TREE IN WIRES NEAR THE INTERSECTION OF POWDER VALLEY ROAD AND PALM ROAD. TIME ESTIMATED.
Jun 3, 11:52 AM EDT	TSTM WND DMG	1 Nnw East Coventry Twp, PA	DOWNED TREE ON SCHOOLHOUSE ROAD. TIME ESTIMATED.
Jun 3, 11:53 AM EDT	TSTM WND DMG	1 W Geryville, PA	DOWNED TREE IN WIRES. TIME ESTIMATED.
Jun 3, 11:53 AM EDT	TSTM WND DMG	2 Nw Milford Twp, PA	DOWNED TREE IN WIRES. TIME ESTIMATED.
Jun 3, 11:55 AM EDT	TSTM WND DMG	2 W Robeson Twp, PA	SEVERAL REPORTS OF TREES AND POWER LINES DOWN.
Jun 3, 11:56 AM EDT	TSTM WND DMG	2 Se Trumbauersville, PA	DOWNED TREE IN WIRES. TIME ESTIMATED.
Jun 3, 11:56 AM EDT	TSTM WND GST 67	North Coventry Twp, PA
Jun 3, 11:59 AM EDT	TSTM WND DMG	Spring City, PA	MULTIPLE LARGE TREES SNAPPED; ONE FELL ONTO AND DESTROYED A SHED. REPORT VIA SOCIAL MEDIA WITH PHOTOS. TIME ESTIMATED FROM RADAR.
Jun 3, 11:59 AM EDT	TSTM WND GST 76	Pottstown, PA
Jun 3, 12:00 PM EDT	TSTM WND DMG	1 E Boyertown, PA	DOWNED TREE CAUSED AN ACCIDENT ON COUNTY LINE ROAD.
Jun 3, 12:00 PM EDT	TSTM WND DMG	1 E Vernfield, PA	DOWNED TREE IN WIRES. TIME ESTIMATED.
Jun 3, 12:00 PM EDT	TSTM WND DMG	1 Ssw Sellersville, PA	DOWNED TREE IN WIRES. TIME ESTIMATED.
Jun 3, 12:00 PM EDT	TSTM WND DMG	East Coventry Twp, PA	DOWNED LIMBS AND POWER LINES.
Jun 3, 12:00 PM EDT	TSTM WND DMG	Spring City, PA	NUMEROUS TREES DOWN IN SPRING CITY. REPORT VIA SOCIAL MEDIA WITH PHOTOS. TIME ESTIMATED FROM RADAR.
Jun 3, 12:00 PM EDT	TSTM WND DMG	Upper Salford Twp, PA	SEVERAL TREES DOWN IN THE AREA. TIME ESTIMATED FROM RADAR.
Jun 3, 12:02 PM EDT	TSTM WND DMG	1 Nnw Washington Twp, PA	DOWNED TREES AND POWER LINES ON SYCAMORE ROAD.
Jun 3, 12:02 PM EDT	TSTM WND DMG	Collegeville, PA	LARGE TREE UPROOTED AT A RESIDENCE. TIME ESTIMATED FROM RADAR.
Jun 3, 12:02 PM EDT	TSTM WND DMG	Collegeville, PA	SEVERAL REPORTS OF TREES AND POWER LINES DOWN IN THE AREA. TIME ESTIMATED.
Jun 3, 12:04 PM EDT	TSTM WND DMG	2 W Fricks, PA	DOWNED TREE IN WIRES. TIME ESTIMATED.
Jun 3, 12:04 PM EDT	TSTM WND DMG	Skippack Twp, PA	MULTIPLE TREES SNAPPED. REPORT VIA SOCIAL MEDIA WITH PHOTOS. TIME ESTIMATED FROM RADAR.
Jun 3, 12:06 PM EDT	TSTM WND DMG	Kulpsville, PA	SEVERAL TREES DOWN IN THE AREA. TIME ESTIMATED FROM RADAR.
Jun 3, 12:07 PM EDT	TSTM WND DMG	Lansdale, PA	PORTION OF A ROOF BLOWN OFF OF AN APARTMENT BUILDING. TIME ESTIMATED FROM RADAR.
Jun 3, 12:10 PM EDT	TSTM WND DMG	Chalfont, PA	TREES AND POWER LINES DOWN ALL ACROSS CENTRAL BUCKS COUNTY INCLUDING CHALFONT. TIME ESTIMATED FROM RADAR.
Jun 3, 12:10 PM EDT	TSTM WND DMG	Pennsburg, PA	TREE ON WIRES AT INTERSECTION OF ROUTES 29 AND 663. TIME ESTIMATED.
Jun 3, 12:11 PM EDT	TSTM WND DMG	3 W Jamison, PA	NUMEROUS REPORTS OF TREES AND POWER LINES DOWN. TIME ESTIMATED.
Jun 3, 12:15 PM EDT	TSTM WND DMG	1 E New Britain, PA	MULTIPLE TREES DOWN WITH THE LARGEST DIAMETER AROUND 1 FOOT.

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
Jun 3, 10:08 AM EDT	Severe Thunderstorm Watch	SPC	4 hr

The nearest sounding before it

Brookhaven, NY (KOKX), launched 12:00Z, 3.6 hours before the alert went out and 208 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1089 m above ground
0-6 km bulk shear: 57 kt
0-1 km storm-relative helicity: 247 m²/s²
0-3 km storm-relative helicity: 376 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.0

Open this sounding in Storm Lab

The text

As transmitted.

756 
WUUS51 KPHI 031538
SVRPHI
NJC019-PAC011-017-029-077-091-095-031615-
/O.NEW.KPHI.SV.W.0049.200603T1538Z-200603T1615Z/

BULLETIN - EAS ACTIVATION REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
1138 AM EDT Wed Jun 3 2020

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  Southern Hunterdon County in northwestern New Jersey...
  Southeastern Berks County in eastern Pennsylvania...
  Southeastern Lehigh County in eastern Pennsylvania...
  Northern Montgomery County in southeastern Pennsylvania...
  Bucks County in southeastern Pennsylvania...
  North central Chester County in southeastern Pennsylvania...
  South central Northampton County in eastern Pennsylvania...

* Until 1215 PM EDT.

* At 1137 AM EDT, severe thunderstorms were located along a line
  extending from Ancient Oaks to Fleetwood to near Kleinfeltersville,
  moving east at 75 mph.

  These are very dangerous storms.

  HAZARD...80 mph wind gusts and penny size hail. A Wind gust of 83 
           mph was recently measured at Reading Airport.

  SOURCE...Radar indicated.

  IMPACT...Flying debris will be dangerous to those caught without 
           shelter. Mobile homes will be heavily damaged. Expect 
           considerable damage to roofs, windows, and vehicles. 
           Extensive tree damage and power outages are likely.

* Locations impacted include...
  Allentown, Reading, Pottstown, Lansdale, East Norriton, Emmaus,
  Wyomissing, Quakertown, Perkasie, Doylestown, Byram, Souderton,
  Bedminster, Hellertown, Birdsboro, Collegeville, Kutztown,
  Royersford, Flemington and Fleetwood.

This includes the following highways...
 Interstate 78 in Pennsylvania between mile markers 49 and 64.
 Northeast Extension between exits A31 and A56.
 Interstate 176 in Pennsylvania between mile markers 5 and 11.

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.

This is an EXTREMELY DANGEROUS SITUATION. These storms are producing 
widespread wind damage across eastern Pennsylvania. SEEK SHELTER NOW 
inside a sturdy structure and stay away from windows!

&&

LAT...LON 4060 7562 4053 7476 4051 7477 4051 7480
      4045 7476 4039 7482 4016 7532 4021 7598
      4033 7617
TIME...MOT...LOC 1537Z 274DEG 67KT 4055 7560 4046 7580 4027 7620 

HAIL...0.75IN
WIND...80MPH
 
$$

JEO

1 follow-up statement

529 
WWUS51 KPHI 031602
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
1202 PM EDT Wed Jun 3 2020

NJC019-PAC011-017-029-077-091-095-031615-
/O.CON.KPHI.SV.W.0049.000000T0000Z-200603T1615Z/
Hunterdon NJ-Berks PA-Lehigh PA-Montgomery PA-Bucks PA-Chester PA-
Northampton PA-
1202 PM EDT Wed Jun 3 2020

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1215 PM EDT
FOR SOUTHERN HUNTERDON...SOUTHEASTERN BERKS...SOUTHEASTERN LEHIGH...
NORTHERN MONTGOMERY...BUCKS...NORTH CENTRAL CHESTER AND SOUTH CENTRAL
NORTHAMPTON COUNTIES...

At 1200 PM EDT, severe thunderstorms were located along a line
extending from near Springtown to near Souderton to Royersford,
moving east at 70 mph.

These are very dangerous storms.

HAZARD...80 mph wind gusts and penny size hail.

SOURCE...Radar indicated.

IMPACT...Flying debris will be dangerous to those caught without 
         shelter. Mobile homes will be heavily damaged. Expect 
         considerable damage to roofs, windows, and vehicles. 
         Extensive tree damage and power outages are likely.

Locations impacted include...
Allentown, Reading, Pottstown, Lansdale, East Norriton, Emmaus,
Quakertown, Perkasie, Doylestown, Byram, Souderton, Bedminster,
Hellertown, Birdsboro, Collegeville, Royersford, Flemington,
Chalfont, Tinicum and Trappe.

This includes the following highways...
 Interstate 78 in Pennsylvania between mile markers 51 and 64.
 Northeast Extension between exits A31 and A56.
 Interstate 176 in Pennsylvania between mile markers 6 and 11.

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.

This is a DANGEROUS SITUATION. These storms are producing widespread 
wind damage with wind gusts over 80 mph reported in Reading. SEEK 
SHELTER NOW inside a sturdy structure and stay away from windows.
 
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.

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

&&

LAT...LON 4020 7584 4026 7605 4040 7580 4060 7560
      4053 7476 4051 7477 4051 7480 4045 7476
      4039 7482 4016 7532
TIME...MOT...LOC 1600Z 281DEG 61KT 4054 7525 4035 7536 4018 7551 

HAIL...0.75IN
WIND...80MPH
 
$$

Fitzsimmons

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 3, 12:24 AM EDT	Special Weather Statement	PHI	Monroe	51 min
Jun 3, 11:04 AM EDT	Severe Thunderstorm Warning	PHI	Berks, Bucks, Carbon, Lehigh, Monroe, Montgomery and 1 more	41 min
Jun 3, 11:29 AM EDT	Severe Thunderstorm Warning	PHI	Berks, Chester, Montgomery	46 min
Jun 3, 11:59 AM EDT	Severe Thunderstorm Warning	PHI	Bucks, Chester, Delaware, Montgomery, Philadelphia	46 min
Jun 3, 12:06 PM EDT	Severe Thunderstorm Warning	PHI	Chester, Delaware, Philadelphia	39 min
Jun 3, 5:46 PM EDT	Severe Thunderstorm Warning	PHI	Berks	44 min
Jun 3, 6:26 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Chester, Montgomery	64 min
Jun 3, 7:02 PM EDT	Severe Thunderstorm Warning	PHI	Chester, Delaware, Montgomery, Philadelphia	58 min
Jun 3, 7:11 PM EDT	Severe Thunderstorm Warning	PHI	Monroe	64 min
Jun 3, 7:21 PM EDT	Tornado Warning	PHI	Delaware, Montgomery, Philadelphia	24 min
Jun 3, 1:08 AM EDT	Special Weather Statement	PHI	Somerset	37 min
Jun 3, 1:44 AM EDT	Areal Flood Advisory	PHI	Hunterdon, Middlesex, Morris, Somerset, Warren	3 hr
Jun 3, 9:48 AM EDT	Small Craft Advisory	PHI		8 hr
Jun 3, 12:35 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Camden, Mercer, Middlesex, Monmouth, Ocean and 1 more	55 min
Jun 3, 12:38 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Burlington, Camden, Cape May, Cumberland, Gloucester and 2 more	69 min
Jun 3, 12:43 PM EDT	Special Marine Warning	PHI		43 min
Jun 3, 1:01 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Ocean	28 min
Jun 3, 1:14 PM EDT	Special Marine Warning	PHI		61 min
Jun 3, 1:14 PM EDT	Special Weather Statement	PHI	Cape May, Cumberland	61 min
Jun 3, 1:20 PM EDT	Special Marine Warning	PHI		55 min
Jun 3, 2:11 PM EDT	Special Marine Warning	PHI		34 min
Jun 3, 7:53 PM EDT	Severe Thunderstorm Warning	PHI	Morris, Sussex	36 min
Jun 3, 7:55 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Burlington, Camden, Cumberland, Gloucester, Ocean and 1 more	33 min

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 2020 Severe Thunderstorm Warnings in New Jersey, 2020 Every severe thunderstorm warning in 2020

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.