An area of thunderstorms, some of them severe, moved from northwest to southeast across southeastern Pennsylvania during the mid-morning hours on Wednesday, June 3rd. Then a derecho, which developed just southeast of Lake Erie during the early morning hours, moved rapidly southeast across Pennsylvania before exiting off the New Jersey coast by early afternoon (130 PM).
Every event with a place to put it. Tap one for its entry below.
Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The episode as NWS PHI wrote it up.
An area of thunderstorms, some of them severe, moved from northwest to southeast across southeastern Pennsylvania during the mid-morning hours on Wednesday, June 3rd. Then a derecho, which developed just southeast of Lake Erie during the early morning hours, moved rapidly southeast across Pennsylvania before exiting off the New Jersey coast by early afternoon (130 PM). Damaging winds associated with this derecho were sporadic over western and central Pennsylvania, but as the thunderstorm complex moved into increasingly unstable air in the eastern part of the state just before noon, wind damage reports became more numerous and widespread. Most of these reports were confined within a 50-mile wide swath extending from Berks County eastward to the Philadelphia metro area, then further east to the Ocean County shoreline in New Jersey. Wind gust reports between 60 and 70 MPH were common within this swath, with some of the highest gusts as follows: 83 MPH at Reading Regional Airport (Berks County), 76 MPH in Pottstown (Montgomery County), 75 MPH in Malvern (Chester County), and 71 MPH in the Holmesburg section of Philadelphia. In addition to these destructive wind gusts, frequent to continuous cloud to ground lightning, heavy rain, and a few instances of hail were also reported throughout the area.
Tragically, four deaths were reported in eastern Pennsylvania as a result of these severe wind gusts. Three fatalities in Montgomery County were due directly to falling trees. The fourth fatality in Delaware County was due to a house fire caused by an electrical malfunction from a fallen tree. This is the highest number of fatalities from a derecho event in Pennsylvania since 1950.
Over 208,000 power outages were reported in southeastern Pennsylvania as a result |of fallen trees on power lines. Some localities were without power for several days. Numerous road closures were also reported due to fallen trees.|A seven story 150 unit apartment building took severe roof damage in Lansdale Borough, Montgomery County. The Montgomery County Community Based COVID-19 Testing Site shut down at noon due to the storms. Personnel took shelter and reported minor property damage.
Because this derecho moved off the coast by 130 PM, the warm afternoon sun was able to sufficiently destabilize the atmosphere for the formation of another round of severe thunderstorms over some of the same areas that experience them earlier in the day. Reported wind gusts associated with these thunderstorms generally ranged between 45 and 65 MPH, with a 65 MPH wind gust measured at the Philadelphia International Airport. The remaining thunderstorms then moved offshore by 1000 PM, which brought an end to the day's severe weather.
The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Philadelphia/Mount Holly wrote its last area forecast discussion before the first event at Jun 3, 10:19 AM EST, 6 minutes earlier.
Area Forecast Discussion
National Weather Service Mount Holly NJ
1119 AM EDT Wed Jun 3 2020
.SYNOPSIS...
A cold front will move into the Mid-Atlantic today and linger
across the area through the end of the week. Low pressure
progressing through southeast Canada on Friday will allow a cold
front to sweep through the region on Saturday. High pressure
will build into the Northeast Sunday into the beginning of next
week. Unsettled weather may return to the area by midweek.
&&
.NEAR TERM /THROUGH TONIGHT/...
The first of several short wave/vorticity impulses is moving across
central Pennsylvania late this morning and will move across our area
through the early afternoon. A line of showers and thunderstorms,
previously associated with elevated instability, will soon be
encountering building surface based instability as it moves
southeastward. CAPE values will build to over 1000 J/kg with shear
values of 35-45+ knots. The flow is fairly unidirectional, and with
700-500 mb winds of 40-60 knots, damaging winds will likely be the
main threat. However, with mid-level lapse rates of 7.0-7.5 C/km,
there will also be the chance for some large hail for the tallest
storms even though the freezing level/wet bulb 0 heights are fairly
high.
Once this line moves offshore this afternoon, additional showers and
thunderstorms are expected to develop behind it as the cold front
continues to slowly sag southward and interact with the building
instability. CAPE could build to 2000+ J/kg, while the vertical wind
profile and lapse rates look similar to early in the day. So any
storms that develop later this afternoon into this evening could
again become severe. Damaging winds and large hail continue to be a
threat.
Another concern on Wednesday will be the heat and humidity.
Temperatures will warm will into the 80s, even lower 90s for some
areas. However, dewpoints will be low enough to keep heat index
values from reaching Heat Advisory levels, although it will be a hot
and humid day.
As the evening progresses, instability will begin to wane ,
therefore the threat for more widespread thunderstorms and severe
weather will diminish as the evening moves into the overnight hours,
although there will be a chance of showers through the night as
multiple vorticity impulses move across the area.
&&
.SHORT TERM /THURSDAY THROUGH THURSDAY NIGHT/...
The front is expected to stall over our region by early Thursday
morning. The question remains exactly where it will stall. For
now have made few changes to the previous forecast as there is
still too much spread to feel confident in exactly where the
front stalls. None the less, where it does end up, there remains
a threat for heavy rain leading to flash flooding.
The zonal flow aloft is expected to be nearly parallel to the
stalled front. We'll have some synoptic scale lift thanks to the
upper level jet (our region should be in the prime location for
the right rear quadrant of the jet). There is unlikely to be
much in the way of dry air advection, keeping precipitable water
values well above normal. The warm cloud layer is expected to
be relatively deep (greater than 10K ft). Additionally, storm
motions are expected to be less than 20 kt. All of these factors
together mean we could have slow moving, training storms in the
vicinity of the stationary front capable of heavy rain. As
mentioned by the previous shift, it will likely not be a
widespread heavy rain event, but rather a narrow band of higher
rain totals. Given the uncertainty as to where this will be,
have held off on issuing a flash flood watch at this time.
As for temperatures, there won't be a very large temperature
gradient across the stationary front. None the less, extensive
cloud cover should keep most of the region in the 80s during the
day.
&&
.LONG TERM /FRIDAY THROUGH TUESDAY/...
Busy start to the medium-range forecast as a decaying front
lingers across the northern Mid-Atlantic on Friday and a
secondary front moves through the Northeast on Saturday. High
pressure will cool us down and dry us out Sunday through
Tuesday, but the weather looks to become more unsettled by the
middle of next week.
The forecast for Friday remains tricky, as model guidance is
quite variable with placement/timing of initiating mechanisms
for convection during the day. However, what is clear is that a
stalled (albeit slowly decaying) front will be in the region.
Weak perturbations within midlevel quasi-zonal flow will be
migrating through the area. The timing of these perturbations is
in question, though, with the 06z GFS considerably slower than
the 00z CMC, e.g. Nevertheless, the ambient environment combined
with likely mesoscale lifting sources difficult to resolve at
this time range suggest scattered convection will likely develop
during the day. Fortunately, the PWs look somewhat lower than
those anticipated for Thursday (around 1.5 inches expected), and
deep-layer shear is quite low (around 20 kt or less). Main
threat looks to be locally heavy rainfall and wet microbursts,
but anticipated coverage of both at this stage looks fairly
small. Will continue to monitor this potential, with the
additional note that antecedent convection will play a primary
role in the placement of the front and the resultant effects on
convective location/evolution.
The model discrepancies increase for Saturday as a strong
northern-stream shortwave trough digs through southeast Canada
into the Northeast. An attendant cold front will move through
the region during the day, but the timing of this is (once
again) all over the place. The CMC looks considerably faster,
but this seems somewhat questionable given the lack of close
proximity to the upstream vort max. Suspect the slower timing of
the GFS is more probable, which would mean another round of
convection for the area during the afternoon/evening. There is a
conditional risk of severe storms (depending on frontal
placement) for the region, as MLCAPE > 1000 J/kg and deep-layer
shear near/above 30 kt is a favorable parameter space for
organized severe storms. PWs will once again be above 1.5 inches
in advance of the front, so locally heavy rainfall is once again
a threat.
Temperatures Friday and Saturday should be warm, with highs in
the mid to upper 80s with dew points in the mid to upper 60s.
Colder/drier air moves into the region by Sunday and continues
through Tuesday as a strong surface high builds into southeast
Canada and the northeast U.S. Expect temperatures near or
slightly below seasonal averages through this period.
The next system is expected to move into the area around the
middle of next week. This system will likely ingest whatever
remains of Cristobal, so this will obviously deserve some
monitoring as time approaches. Of course, given how far out this
is and how variable the guidance is by this point, confidence is
quite low on details.
&&
.AVIATION /14Z WEDNESDAY THROUGH SUNDAY/...
The following discussion is for KPHL, KPNE, KTTN, KABE, KRDG, KILG,
KMIV, KACY and surrounding areas.
Today...Generally VFR conditions expected through the day. However,
there are a couple of chances of showers and thunderstorms. Any
showers or thunderstorms could lead to a brief period of MVFR or IFR
conditions. There is also the possibility for some severe weather if
thunderstorms do develop with damaging winds and hail possible. Two
TEMPO grounds have been included in the TAFS to account for the
thunderstorm potential and best timing of the storms.
Generally west to southwest winds increasing to 10-15 knots, with
gusts 20-25 knots.
Tonight...Mostly VFR conditions are expected. However, there
will be a chance of showers and thunderstorms continuing into
the evening hours which may temporarily lead to lower
conditions. Wind gusts will diminish by sunset.
Outlook...
Thursday...Prevailing VFR, with a period of MVFR/IFR Thursday
afternoon and evening with showers and storms. Highest chances
for prevailing reduced visibilities will be from PNE/PHL south.
Light northwesterly winds becoming light southwesterly in the
afternoon then light and variable overnight. Low to moderate
confidence.
Friday through Saturday...Primarily VFR conditions. However,
multiple rounds of showers/storms possible with restrictions
likely in their vicinity. South winds 5 to 15 kt gradually
becoming west by Saturday. Some gusts to 20 kt possible during
the day. Moderate confidence.
Saturday night and Sunday...Some lingering storms possible
southeast of PHL Saturday evening. Otherwise, mainly VFR with
northwest winds up to 10 kt Saturday night becoming 10 to 15 kt
with higher gusts on Sunday. Moderate confidence.
&&
.MARINE...
Today...A Small Craft Advisory has been issued for Delaware Bay
as winds have been gusting around 25 knots this morning and
will likely continue into the afternoon. Conditions expected to
remain below advisory levels on the Atlantic coastal waters as a
low level inversion is expected to keep the stronger winds from
mixing down. However, winds will gust around 20 knots at times
on the Atlantic coastal waters as well.
There is a chance of showers and thunderstorms, some which could
produce wind gusts greater than 35 knots.
To night...Conditions are expected to remain below advisory
levels, although winds could continue to gust around 20 knots at
times. A chance of showers and thunderstorms continues into the
evening hours, before chances diminish overnight.
Outlook...
Thursday through Saturday night...Sub-advisory winds/seas
expected. Storms possible, with strong/erratic winds and higher
waves possible in their proximity. The best chances for
convection are Thursday afternoon/evening, Friday night, and
Saturday afternoon/night, though chances exist through the
period.
Sunday...Sub-advisory winds/seas and fair conditions expected.
Rip currents...
West to southwest winds increase during Wednesday. Wave heights
may increase slightly, and with the new moon on Friday low tides
will be lower than normal. Therefore, have updated the risk for
the formation of dangerous rip currents to moderate through this
evening.
A lighter southerly flow Thursday should result in a low risk
of rip currents.
&&
.PHI WATCHES/WARNINGS/ADVISORIES...
PA...None.
NJ...None.
DE...None.
MD...None.
MARINE...Small Craft Advisory until 8 PM EDT this evening for ANZ430-
431.
&&
Synopsis...CMS
Near Term...Robertson
Short Term...Johnson
Long Term...CMS
Aviation...CMS/Johnson/Robertson
Marine...CMS/Johnson/RobertsonHazardous Weather Outlook National Weather Service Mount Holly NJ 1031 AM EDT Wed Jun 3 2020 DEZ002-MDZ012-015-041445- Kent-Kent MD-Queen Annes- 1031 AM EDT Wed Jun 3 2020 This Hazardous Weather Outlook is for central Delaware and northeast Maryland. .DAY ONE...Today and tonight. Severe thunderstorms are possible today. The primary hazard will be damaging winds. Some large hail is possible as well. .DAYS TWO THROUGH SEVEN...Thursday through Tuesday. A narrow corridor of heavy rain leading to flash flooding will be possible with showers and storms on Thursday. .SPOTTER INFORMATION STATEMENT... Spotter activation may be needed. Please relay any information about observed severe weather to the NWS while following all local, state, and CDC guidelines. DEZ001-MDZ008-NJZ016>019-021>023-027-PAZ070-071-101-102-104-041445- New Castle-Cecil-Salem-Gloucester-Camden-Northwestern Burlington- Cumberland-Atlantic-Cape May-Southeastern Burlington-Delaware- Philadelphia-Western Chester-Eastern Chester-Eastern Montgomery- 1031 AM EDT Wed Jun 3 2020 ...SEVERE THUNDERSTORM WATCH 242 IN EFFECT UNTIL 3 PM EDT THIS AFTERNOON... This Hazardous Weather Outlook is for northern Delaware, northeast Maryland, southern New Jersey and southeast Pennsylvania. .DAY ONE...Today and tonight. Please listen to NOAA Weather Radio or go to weather.gov on the Internet for more information about the following hazards. Severe Thunderstorm Watch. .DAYS TWO THROUGH SEVEN...Thursday through Tuesday. A narrow corridor of heavy rain leading to flash flooding will be possible with showers and storms on Thursday. .SPOTTER INFORMATION STATEMENT... Spotter activation may be needed. Please relay any information about observed severe weather to the NWS while following all local, state, and CDC guidelines. NJZ007-009-010-012-013-015-020-PAZ054-055-060>062-103-105-106-041445- Warren-Hunterdon-Somerset-Middlesex-Western Monmouth-Mercer-Ocean- Carbon-Monroe-Berks-Lehigh-Northampton-Western Montgomery- Upper Bucks-Lower Bucks- 1031 AM EDT Wed Jun 3 2020 ...SEVERE THUNDERSTORM WATCH 242 IN EFFECT UNTIL 3 PM EDT THIS AFTERNOON... This Hazardous Weather Outlook is for central New Jersey, northern New Jersey, northwest New Jersey, southern New Jersey, east central Pennsylvania, northeast Pennsylvania and southeast Pennsylvania. .DAY ONE...Today and tonight. Please listen to NOAA Weather Radio or go to weather.gov on the Internet for more information about the following hazards. Severe Thunderstorm Watch. .DAYS TWO THROUGH SEVEN...Thursday through Tuesday. The probability for widespread hazardous weather is low. .SPOTTER INFORMATION STATEMENT... Spotter activation may be needed. Please relay any information about observed severe weather to the NWS while following all local, state, and CDC guidelines. NJZ001-008-041445- Sussex-Morris- 1031 AM EDT Wed Jun 3 2020 This Hazardous Weather Outlook is for northern New Jersey. .DAY ONE...Today and tonight. Severe thunderstorms are possible today. The primary hazard will be damaging winds. Some large hail is possible as well. .DAYS TWO THROUGH SEVEN...Thursday through Tuesday. The probability for widespread hazardous weather is low. .SPOTTER INFORMATION STATEMENT... Spotter activation may be needed. Please relay any information about observed severe weather to the NWS while following all local, state, and CDC guidelines. DEZ003-MDZ019-020-041445- Inland Sussex-Talbot-Caroline- 1031 AM EDT Wed Jun 3 2020 This Hazardous Weather Outlook is for southern Delaware and northeast Maryland. .DAY ONE...Today and tonight. Severe thunderstorms are possible today. The primary hazard will be damaging winds. Some large hail is possible as well. .DAYS TWO THROUGH SEVEN...Thursday through Tuesday. A narrow corridor of heavy rain leading to flash flooding will be possible with showers and storms on Thursday. .SPOTTER INFORMATION STATEMENT... Spotter activation may be needed. Please relay any information about observed severe weather to the NWS while following all local, state, and CDC guidelines. ANZ455-041445- Coastal waters from Cape Henlopen to Fenwick Island DE out 20 nm- 1031 AM EDT Wed Jun 3 2020 This Hazardous Weather Outlook is for Atlantic coastal waters. .DAY ONE...Today and tonight. Storms today will be capable of producing wind gusts in excess of 35 kt. .DAYS TWO THROUGH SEVEN...Thursday through Tuesday. The probability for widespread hazardous weather is low. .SPOTTER INFORMATION STATEMENT... Spotter activation may be needed. Please relay any information about observed severe weather to the NWS while following all local, state, and CDC guidelines. ANZ430-431-450>454-041445- Delaware Bay waters north of East Point NJ to Slaughter Beach DE- Delaware Bay waters south of East Point NJ to Slaughter Beach DE- Coastal waters from Sandy Hook to Manasquan Inlet NJ out 20 nm- Coastal waters from Manasquan Inlet to Little Egg Inlet NJ out 20 nm- Coastal waters from Little Egg Inlet to Great Egg Inlet NJ out 20 nm- Coastal waters from Great Egg Inlet to Cape May NJ out 20 nm- Coastal waters from Cape May NJ to Cape Henlopen DE out 20 nm- 1031 AM EDT Wed Jun 3 2020 ...SEVERE THUNDERSTORM WATCH 242 IN EFFECT UNTIL 3 PM EDT THIS AFTERNOON... This Hazardous Weather Outlook is for Atlantic coastal waters and Delaware Bay Waters. .DAY ONE...Today and tonight. Please listen to NOAA Weather Radio or go to weather.gov on the Internet for more information about the following hazards. Severe Thunderstorm Watch. .DAYS TWO THROUGH SEVEN...Thursday through Tuesday. The probability for widespread hazardous weather is low. .SPOTTER INFORMATION STATEMENT... Spotter activation may be needed. Please relay any information about observed severe weather to the NWS while following all local, state, and CDC guidelines. NJZ014-026-041445- Eastern Monmouth-Coastal Ocean- 1031 AM EDT Wed Jun 3 2020 ...SEVERE THUNDERSTORM WATCH 242 IN EFFECT UNTIL 3 PM EDT THIS AFTERNOON... This Hazardous Weather Outlook is for central New Jersey and southern New Jersey. .DAY ONE...Today and tonight. Please listen to NOAA Weather Radio or go to weather.gov on the Internet for more information about the following hazards. Severe Thunderstorm Watch. There is a moderate risk of rip currents today. .DAYS TWO THROUGH SEVEN...Thursday through Tuesday. The probability for widespread hazardous weather is low. .SPOTTER INFORMATION STATEMENT... Spotter activation may be needed. Please relay any information about observed severe weather to the NWS while following all local, state, and CDC guidelines. NJZ024-025-041445- Atlantic Coastal Cape May-Coastal Atlantic- 1031 AM EDT Wed Jun 3 2020 ...SEVERE THUNDERSTORM WATCH 242 IN EFFECT UNTIL 3 PM EDT THIS AFTERNOON... This Hazardous Weather Outlook is for southern New Jersey. .DAY ONE...Today and tonight. Please listen to NOAA Weather Radio or go to weather.gov on the Internet for more information about the following hazards. Severe Thunderstorm Watch. There is a moderate risk of rip currents today. .DAYS TWO THROUGH SEVEN...Thursday through Tuesday. The probability for widespread hazardous weather is low. .SPOTTER INFORMATION STATEMENT... Spotter activation may be needed. Please relay any information about observed severe weather to the NWS while following all local, state, and CDC guidelines. DEZ004-041445- Delaware Beaches- 1031 AM EDT Wed Jun 3 2020 This Hazardous Weather Outlook is for southern Delaware. .DAY ONE...Today and tonight. There is a moderate risk of rip currents today. Severe thunderstorms are possible today. The primary hazard will be damaging winds. Some large hail is possible as well. .DAYS TWO THROUGH SEVEN...Thursday through Tuesday. The probability for widespread hazardous weather is low. .SPOTTER INFORMATION STATEMENT... Spotter activation may be needed. Please relay any information about observed severe weather to the NWS while following all local, state, and CDC guidelines. CMS
The Philadelphia radar (KDIX), 141 km away, was scanning. The volume nearest the first event began at 15:24 UTC.
139 thunderstorm wind, 1 hail. Local standard time, as filed.
Several trees downed on a property on River Road. Report via social media with photos. Time estimated from radar.
Numerous reports of trees and wires down in North Heidelberg. Time estimated from radar.
Trees down on wires on Christmas Village Road. Time estimated from radar.
Tree down on wires on Mount Pleasant Road. Time estimated from radar.
Multiple trees and limbs snapped or downed in Fritztown. Time estimated from radar.
Several tree limbs and power lines down in the Reading area. Estimated wind gusts up to 60 MPH.
Power pole fell onto a house near Reading, PA. Time estimated from radar.
Several reports of tree and power line damage in the Reading area.
Downed tree in wires on State Highway 12 near the 11th Street interchange. Time estimated from radar.
Downed tree in wires on State Highway 12 near Spring Valley Road. Time estimated from radar.
Downed tree in wires near Vinemont. Time estimated from radar.
Large tree downed in Wyomissing. Report via social media with video. Time estimated from radar.
Tree down onto a house on East Court Boulevard. Time estimated from radar.
Several reports of trees and wires down at Spring Ridge Road and West Lawn Road.
Downed tree and wires on Cleveland Avenue in Springmont.
Several reports of trees and power lines down near Wyomissing. Time estimate from radar.
Widespread power outages with numerous reports of power lines and trees down near Muhlenberg Park. Time estimated from radar.
Building collapse caused by a tree falling into a house near Muhlenberg Park.
Downed tree in wires near the intersection of Palm Road and Kings Highway South. Time estimated from radar.
Large tree down near Yellow House Hotel near Douglasvile. Time estimated from radar.
Several reports of tree and power line damage near Wyomissing. Time estimated from radar.
Several reports of trees and power lines down in Stoney Creek Mills. Time estimated from radar.
Downed tree in wires near the intersection of Palm Road and Kings Highway South near Hosensack. Time estimated from radar.
Several reports of trees and power lines down near Alburtis.
Downed tree in wires near the intersection of Powder Valley Road and Palm Road. Time estimated from radar.
Downed tree in wires near the intersection of Powder Valley Road and Palm Road near Hosensack. Time estimated from radar.
Downed tree on Schoolhouse Road near Kenilworth. Time estimated from radar.
Downed tree in wires near the intersection of State Highway 23 and Coventryville Road. Time estimated from radar.
Downed tree in wires near the intersection of State Highway 23 and Coventryville Road. Time estimated from radar.
Downed tree in wires near Dillingersvile. Time estimated from radar.
Downed tree in wires near Geryville. Time estimated from radar.
Several reports of trees and power lines down near Plowville. Time estimated from radar.
Downed tree on Pughtown Road near Pughtown. Time estimated from radar.
Downed tree in wires near Trumbauersville. Time estimated from radar.
Multiple large trees snapped in Spring City.
Trees and power lines down near Geigertown. Time estimated from radar.
Downed tree caused an accident on County Line Road near Boyertown.
Downed tree in wires in Sellersville. Time estimated from radar.
Numerous trees down in Spring City. Report via social media with photos. Time estimated from radar.
Downed limbs and power lines near Vincent. Time estimated from radar.
Downed tree in wires near Vernfield. Time estimated from radar.
Several trees down in the Salford area. Time estimated from radar.
Multiple tree branches covering the streest. Large branches between one and two inches thick. Estimated time based on radar.
Downed trees and power lines on Sycamore Road in Passmore. Time estimated from radar.
Several reports of trees and power lines down in the Collegeville area. Time estimated from radar.
Downed tree in wires near Hatfield. Time estimated from radar.
Multiple trees snapped near Skippack. Report via social media with photos. Time estimated from radar.
Large tree down on a building at the Knollwood Apartments in Phoenixville. Photo shows considerable structural damage. Time estimated from radar.
Large tree down in the 400 block of South Park Avenue in Trooper. Time estimated from radar.
Several trees down near Mainland. Time estimated from radar.
Numerous reports of power lines down in Valley Forge. Time estimated from radar.
Portion of a roof blown off an apartment building in Fortuna. Time estimated from radar.
Several large trees downed in Valley Forge National Historic Park. Multiple structures were damaged by the fallen trees. Time estimated from radar.
Trees and power lines down in numerous places across central Bucks County, including Chalfont. Time estimated from radar.
Multiple large tree branches down and two trees snapped on golf course near Colonial Village.
Tree on wires at intersection of Routes 29 and 663 in Pennsburg. Time estimated from radar.
Numerous reports of trees and power lines down in Warrington. Time estimated from radar.
Multiple trees down near the intersection of Spring Road and North Warren Avenue. Time estimated from radar.
Large tree down on Wall Street in Spring City. Time estimated from radar.
Downed tree in wires near Exit 18 of Interstate 476 in Conshohocken. Time estimated from radar.
Numerous reports of trees and power lines down in Norristown. Time estimated from radar.
Tree down on Conestoga Road near Chester Springs.
Tree down on Saint Matthews Road near Birchrunville. Time estimated from radar.
Video via social media of transformers blowing during thunderstorm winds near Bridgeport. Time estimated from radar.
Tree and wires down on West Main Street in Trooper.
Several reports of trees and power lines down in the Warminster area. Time estimated from radar.
Several photos of uprooted trees in King of Prussia provided via social media. Time estimated from radar.
Several trees uprooted in Plymouth Valley. Time estimated from radar.
Multiple trees down near Delaware Valley University with the largest diameter around 1 foot.
Trees and power poles down in Newton Square. Time estimated from radar.
Downed tree on interstate 476 near the I-76 Interchange in West Conshohocken. Time estimated from radar.
Downed tree in wires on Pennsylvania Avenue near Bridge Street in Oreland. Time estimated from radar.
Downed tree in wires on Stenton Avenue near Hillcrest Avenue in Philadelphia. Time estimated from radar.
Numerous reports of power lines down throughout the Cheney area. Time estimated from radar.
Tree down along side road in Oakmont. Time estimated from radar.
A tree crased through the roof of a building at the Philmont Country Club in Lower Moreland Township killing one employee.
Large trees down damaging fencing and other property at multiple residences in Davisville. Time estimated from radar.
Several trees and power poles down in Springfield. Time estimated from radar.
Numerous reports of power lines down across the Aston area. Time estimated from radar.
A tree fell on the roof of a car killing one person near the intersection of Belmont Avenue and Rock Hill Road. Time estimated from radar.
Downed power lines throughout the Franklin Square area. Time estimated from radar.
A tree fell on the roof of a car killing one person in Lower Merion along Medford Road.
Several downed trees in the Bensalem area. Time estimated from radar.
Multiple trees and power poles down on Bellevue Avenue. Report via social media with photos. County Emergency Management also reports widespread damage in Bensalem. Time estimated from radar.
Several trees uprooted near Churchville Park. Time estimated from radar.
Trees and large limbs down in the Holland area. Time estimated from radar.
Several large tree limbs snapped off with some falling onto cars on Whitby Avenue approaching Cobbs Creek Parkway in southwest Philadelphia. Time estimated from radar.
Trees down in the Belmont section of Philadelphia. Time estimated from radary.
Section of a roof blown off at the Park Circle Apartments near the Rhawnhurst section of Philadelphia. Time estimated from radar.
Several downed trees in Northeast Philadelphia near the Bucks County line. Time estimated from radar.
Large trees down in neighbors yard near Fort Washington PA. Time estimated from radar.
Several large tree limbs snapped off near Bensalem, destroying a fence. Time estimated from radar.
A tree fell on a power line that fell on a house near Wallingford, which then started a house fire, killing one individual. Time estimated from radar.
Bordentown NOS gauge.
Downed power lines on Cleveland Avenue in West Lawn. Time estimated from radar.
Dime to nickel size hail near Womelsdorf. Time estimated from radar.
Downed tree damaged a property on Garfield Avenue in West Wyomissing. Time estimated from radar.
Downed tree onto a house in Springmont.
Downed power lines near Texter Mountain Road in Wernersville. Time estimated from radar.
Downed tree on wires near Octagon Avenue in West Wyomissing. Time estimated from radar.
Tree on wires on Woodward Drive in Reading. Time estimated from radar.
MPING report of trees down in Sinking Spring. Time estimated from radar.
Downed power lines on East Main Street and Chestnut Street in Kulptown. Time estimated from radar.
Downed trees and wires reported in Birdsboro. Time estimated from radar.
Large tree down near the intersection of Fairview Road and Peters Lane in Glenmoore.
Several large trees down near the intersection of Horseshoe Trail Road and Haverhill Road in Chester Springs.
Downed tree blocking Hillcrest Avenue near Forrest Avenue in Kimberton. Time estimated from radar.
Downed wires on a vehicle on Coldstream Road in Kimberton. Time estimated from radar.
Downed wires on Conestoga Road near Lancaster Avenue in Malvern. Time estimated from radar.
Downed tree and traffic light on Moores Avenue and Kelmar Avenue in Malvern. Time estimated from radar.
Downed tree and wires on Monument Avenue in Malvern. Time estimated from radar.
Tree down on Lloyd Avenue in Malvern. Time estimated from radar.
Downed tree on Kings Highway near Bailey Road near Downington. Time estimated from radar.
Downed tree on Hibernia Road near Lafayette Road in Coatsville. Time estimated from radar.
Several reports of power lines down in the Newton Square area. Time estimated from radar.
Downed tree on Country Club Road near Beacon Hill Lane near Valley Forge. Time estimated from radar.
Tree into a house on Hilltop Road in Paoli. Time estimated from radar.
Multiple downed trees and limbs near Wayne. Time estimated from radar.
Downed wire on Paoli Pike near Rustic Lane in Malvern. Time estimated from radar.
Tree into a house on Mill Road in Glen Mills. Time estimated from radar.
Widespread reports of power lines down in Brookhaven and Springfield. Time estimated from radar.
Downed trees on Leopard Road near Edgewood Avenue in Paoli. Time estimated from radar.
Downed tree blocking Old Eagle School Road near Wayne. Time estimated from radar.
Downed tree blocking Grubb Road near Treble Lane in Paoli. Time estimated from radar.
Several reports of trees and wires down in the Folcroft area. Time estimated from radar.
Downed tree and wires on Laurel Road in Darby. Time estimated from radar.
Downed trees and wires in the Darby area. Time estimated from radar.
Downed tree and wires near Alfred Avenue in Darby. Time estimated from radar.
As the offices recorded each death: direct deaths were caused by the weather itself, indirect ones by something it set in motion.
| Event | Date | Age | Sex | Where | Kind |
|---|---|---|---|---|---|
| Thunderstorm Wind, Montgomery | 2020-06-03 | 38 | Male | Permanent Structure | Direct |
| Thunderstorm Wind, Montgomery | 2020-06-03 | 49 | Female | Vehicle/Towed Trailer | Direct |
| Thunderstorm Wind, Montgomery | 2020-06-03 | Male | Vehicle/Towed Trailer | Direct | |
| Thunderstorm Wind, Delaware | 2020-06-03 | Male | Permanent Home | Indirect |
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Pennsylvania in 2020Every state in 2020This day in weather historyWarnings in Pennsylvania, June 2020
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 885172, 885173, 885174, 885175, 885644, 885176, 885177, 885178, 885645, 885179, 885180, 885181, 885182, 885183, 885184, 885197, 885185, 885186, 885187, 885648, 885169, 885188, 885189, 885190, 885198, 885199, 885170, 885200, 885210, 885171, 885201, 885202, 885203, 885204, 885205, 885206, 885650, 885207, 885652, 885211, and more.