A cold front dropped southwestward from New England into Pennsylvania during the late afternoon and evening of June 3, 2023, spawning scattered thunderstorms. SBCAPE was moderately high (>2000 J/kg), and deep layer (0-6 km) shear of 40 kts was supportive of supercells across the eastern half of Pennsylvania.
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 CTP wrote it up.
A cold front dropped southwestward from New England into Pennsylvania during the late afternoon and evening of June 3, 2023, spawning scattered thunderstorms. SBCAPE was moderately high (>2000 J/kg), and deep layer (0-6 km) shear of 40 kts was supportive of supercells across the eastern half of Pennsylvania. Perhaps the most notable aspects of this event were the large hail and the northeast-southwest cell movement.
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 State College, PA wrote its last area forecast discussion before the first event at Jun 3, 1:46 PM EST, 2 hours 1 minute earlier.
Area Forecast Discussion National Weather Service State College PA 246 PM EDT Sat Jun 3 2023 .SYNOPSIS... Showers/storms will drop south of the area this evening as drier and cooler air is pushed in on good northerly flow. Seasonably cooler and drier air will follow in the wake of the front. The cooler conditions will be here for much of next week. Precipitation will be unlikely, too. && .NEAR TERM /UNTIL 6 AM SUNDAY MORNING/... SHRA/TSRA popping up right on schedule. Recent SWOMCD indicates no urgent concerns for widespread svr convection. An isolated cell or two may become severe due to high CAPE and steep mid level lapse rates. Deep convection at 18Z is generally along the ridges of the Alleghenies. This is likely the first volley of storms, as the meso models generate more convection over the east than the west later this aftn and evening, dropping into the south-central mtns. A little wary of following this too closely, as the cooler temps and lower clouds they have had for much of the day are currently a stabilizing influence. Areal coverage of the storms is not expected to be high/widespread enough to warrant 100 PoPs except in small areas if we see the whites of their eyes. The dry air continues to make it's way south this evening, and should eventually clear the SHRA/TSRA out to our S well before midnight. Some lower clouds will probably be trapped under the subsidence inversion over the southern Alleghenies overnight. So, we've included mentions of fog and higher clouds there. Clearing across the north and dewpoint drop will help mins reach the u40s in the nrn mtns, but the clouds in the SW will keep them in the m50s. && .SHORT TERM /6 AM SUNDAY MORNING THROUGH SUNDAY NIGHT/... The upper low will wobble around New England, mainly offshore for the period, driving 8H temps down. Dry air mixes down and clears out the SW in the first half of the morning. The wind will back some to the N for the aftn, and this will help drop dewpoints even more. Even mixing up to 5-7kft and tons of sunshine on Sunday we'll struggle to get temps near 80F anywhere. The SE cities will get into the m70s, but that's not much below normals (2-4F below) for early June. Dry air and light wind will allow temps to drop into the 40s everywhere Sun night, except perhaps the urban areas of the SE. && .LONG TERM /MONDAY THROUGH FRIDAY/... Medium range guidance shows a deepening upper trough over the NE CONUS into next week, likely resulting in cooler than average temperatures for early June. The trough axis along with the bulk of rainfall looks likely to remain east of PA. Relatively cool temps aloft coupled with occasional shortwaves rotating southward across the area could support some showers and thunderstorms each afternoon, but models suggest that very little moisture will be in place and rainfall will be light. The upper level low begins to move east of the area on Friday, allowing for a gradual warming trend to begin and lower chances for rain. && .AVIATION /19Z SATURDAY THROUGH THURSDAY/... 18Z TAFS sent. Some adjustments to the AOO and JST for a thunderstorm. Westward moving cold front will result in a chance of shower or storm until sunset. Otherwise dry with mainly VFR conditions into Monday, as drier air builds southward. Some chance of MVFR CIGS at spots like JST later tonight. Expect winds to kick up after sunrise on Sunday, given the upper level trough swinging across the area. Outlook... Mon...Mainly VFR. Tue-Thu...Rain showers with possible t-storms in the afternoon. && .CTP WATCHES/WARNINGS/ADVISORIES... None. && SYNOPSIS...Dangelo NEAR TERM...Dangelo SHORT TERM...Dangelo LONG TERM...DeVoir/Bauco AVIATION...Martin
Hazardous Weather Outlook National Weather Service State College PA 422 AM EDT Sat Jun 3 2023 PAZ004>006-010>012-017-018-037-041-042-045-046-049>053-057>059-065- 066-040830- Warren-McKean-Potter-Elk-Cameron-Northern Clinton-Clearfield- Northern Centre-Tioga-Northern Lycoming-Sullivan-Southern Clinton- Southern Lycoming-Union-Snyder-Montour-Northumberland-Columbia- Dauphin-Schuylkill-Lebanon-York-Lancaster- 422 AM EDT Sat Jun 3 2023 This Hazardous Weather Outlook is for central Pennsylvania. .DAY ONE...Today and tonight. The probability for widespread hazardous weather is low. .DAYS TWO THROUGH SEVEN...Sunday through Friday. The probability for widespread hazardous weather is low. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time. PAZ019-024>028-033>036-056-063-064-040830- Southern Centre-Cambria-Blair-Huntingdon-Mifflin-Juniata-Somerset- Bedford-Fulton-Franklin-Perry-Cumberland-Adams- 422 AM EDT Sat Jun 3 2023 This Hazardous Weather Outlook is for central Pennsylvania. .DAY ONE...Today and tonight. Numerous showers and scattered thunderstorms will develop across the region this afternoon and will continue into early this evening to the southwest of the Route 322 corridor. Frequent cloud to ground lightning, pea size hail, and brief wind gusts between 35 and 45 mph are possible with some of the thunderstorms. .DAYS TWO THROUGH SEVEN...Sunday through Friday. The probability for widespread hazardous weather is low. .SPOTTER INFORMATION STATEMENT... Spotter are encouraged to report hail, recorded strong wind gusts, or any wind damage to the National Weather Service. Lambert
Special Weather Statement
National Weather Service State College PA
352 PM EDT Sat Jun 3 2023
PAZ024-033-032015-
Somerset PA-Cambria PA-
352 PM EDT Sat Jun 3 2023
...A STRONG THUNDERSTORM WILL IMPACT NORTH CENTRAL SOMERSET AND
SOUTHWESTERN CAMBRIA COUNTIES THROUGH 415 PM EDT...
At 351 PM EDT, Doppler radar was tracking a strong thunderstorm over
Nanty-Glo, moving southwest at 25 mph.
HAZARD...Wind gusts up to 50 mph and pea size hail.
SOURCE...Radar indicated.
IMPACT...Gusty winds could knock down tree limbs and blow around
unsecured objects. Minor hail damage to vegetation
possible.
Locations impacted include...
Johnstown, Westmont, Windber, Belmont, Nanty-Glo, Portage, Geistown,
Southmont, Vinco, Dale, East Conemaugh, Salix-Beauty Line Park,
Davidsville, Paint, Jerome, South Fork, Scalp Level, Sidman, St.
Michael and Daisytown.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building.
This storm may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.
&&
LAT...LON 4033 7902 4036 7900 4045 7895 4050 7890
4040 7866 4012 7887 4021 7912
TIME...MOT...LOC 1951Z 031DEG 21KT 4041 7881
MAX HAIL SIZE...0.25 IN
MAX WIND GUST...50 MPH
MartinPreliminary Local Storm Report
National Weather Service State College PA
414 PM EDT Sat Jun 3 2023
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0340 PM Hail 4 NNW Mifflinville 41.08N 76.33W
06/03/2023 E0.75 inch Columbia PA Public
Report from mPING: Dime (0.75 in.).
&&Special Weather Statement
National Weather Service State College PA
426 PM EDT Sat Jun 3 2023
PAZ028-050-052-056>058-032100-
Perry PA-Northumberland PA-Juniata PA-Dauphin PA-Snyder PA-
Schuylkill PA-
426 PM EDT Sat Jun 3 2023
...A STRONG THUNDERSTORM WILL IMPACT WEST CENTRAL SCHUYLKILL...
SOUTHWESTERN NORTHUMBERLAND...NORTHWESTERN DAUPHIN...EASTERN
JUNIATA...SOUTHEASTERN SNYDER AND NORTHEASTERN PERRY COUNTIES THROUGH
500 PM EDT...
At 425 PM EDT, Doppler radar was tracking a strong thunderstorm near
Selinsgrove, moving southwest at 35 mph.
HAZARD...Wind gusts up to 50 mph and pea size hail.
SOURCE...Radar indicated.
IMPACT...Gusty winds could knock down tree limbs and blow around
unsecured objects. Minor hail damage to vegetation
possible.
Locations impacted include...
Millersburg, Trevorton, Lykens, Newport, Duncannon, Elizabethville,
Port Trevorton, New Buffalo, Klingerstown, Rebuck, Meiserville,
Urban, Liverpool, Halifax, Gratz, Millerstown, Dalmatia, Berrysburg,
Herndon and Pillow.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building.
This storm may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.
&&
LAT...LON 4079 7673 4066 7659 4034 7700 4055 7722
TIME...MOT...LOC 2025Z 049DEG 32KT 4068 7675
MAX HAIL SIZE...0.25 IN
MAX WIND GUST...50 MPH
MartinSpecial Weather Statement
National Weather Service State College PA
427 PM EDT Sat Jun 3 2023
PAZ028-050-052-056>058-032100-
Perry PA-Northumberland PA-Juniata PA-Dauphin PA-Snyder PA-
Schuylkill PA-
427 PM EDT Sat Jun 3 2023
...A STRONG THUNDERSTORM WILL IMPACT WEST CENTRAL SCHUYLKILL...
SOUTHWESTERN NORTHUMBERLAND...NORTHWESTERN DAUPHIN...EASTERN
JUNIATA...SOUTHEASTERN SNYDER AND NORTHEASTERN PERRY COUNTIES THROUGH
500 PM EDT...
At 426 PM EDT, Doppler radar was tracking a strong thunderstorm near
Selinsgrove, moving southwest at 35 mph.
HAZARD...Wind gusts up to 50 mph and pea size hail.
SOURCE...Radar indicated.
IMPACT...Gusty winds could knock down tree limbs and blow around
unsecured objects. Minor hail damage to vegetation
possible.
Locations impacted include...
Millersburg, Trevorton, Lykens, Newport, Duncannon, Elizabethville,
Port Trevorton, New Buffalo, Klingerstown, Rebuck, Meiserville,
Urban, Liverpool, Halifax, Gratz, Millerstown, Dalmatia, Berrysburg,
Herndon and Pillow.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building.
This storm may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.
&&
LAT...LON 4079 7673 4066 7659 4034 7700 4055 7722
TIME...MOT...LOC 2026Z 049DEG 32KT 4068 7676
MAX HAIL SIZE...0.25 IN
MAX WIND GUST...50 MPH
MartinSpecial Weather Statement
National Weather Service State College PA
432 PM EDT Sat Jun 3 2023
PAZ036-056-063-032100-
Perry PA-Franklin PA-Cumberland PA-
432 PM EDT Sat Jun 3 2023
...A STRONG THUNDERSTORM WILL IMPACT NORTHEASTERN FRANKLIN...
SOUTHWESTERN PERRY AND WESTERN CUMBERLAND COUNTIES THROUGH 500 PM
EDT...
At 431 PM EDT, Doppler radar was tracking a strong thunderstorm 13
miles northwest of Carlisle, moving southwest at 20 mph.
HAZARD...Wind gusts up to 50 mph and penny size hail.
SOURCE...Radar indicated.
IMPACT...Gusty winds could knock down tree limbs and blow around
unsecured objects. Minor hail damage to vegetation
possible.
Locations impacted include...
Shippensburg, Plainfield, Newville, Bloserville, Colonel Denning
State Park, Roxbury, Loysville, Walnut Bottom, Shermansdale, Blain,
Landisburg and Shippensburg University.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building.
This storm may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.
&&
LAT...LON 4046 7740 4033 7717 4000 7745 4015 7774
TIME...MOT...LOC 2031Z 033DEG 19KT 4035 7736
MAX HAIL SIZE...0.75 IN
MAX WIND GUST...50 MPH
MartinSpecial Weather Statement
National Weather Service State College PA
434 PM EDT Sat Jun 3 2023
PAZ049>052-032100-
Union PA-Northumberland PA-Montour PA-Snyder PA-
434 PM EDT Sat Jun 3 2023
...A STRONG THUNDERSTORM WILL IMPACT SOUTHWESTERN NORTHUMBERLAND...
EASTERN SNYDER...WEST CENTRAL MONTOUR AND SOUTHEASTERN UNION COUNTIES
THROUGH 500 PM EDT...
At 434 PM EDT, Doppler radar was tracking a strong thunderstorm over
Northumberland, moving south at 15 mph.
HAZARD...Wind gusts up to 50 mph and penny size hail.
SOURCE...Radar indicated.
IMPACT...Gusty winds could knock down tree limbs and blow around
unsecured objects. Minor hail damage to vegetation
possible.
Locations impacted include...
Sunbury, Milton, Lewisburg, Selinsgrove, Northumberland, Mifflinburg,
Winfield, Fairview-Ferndale, Trevorton, Shamokin Dam, Linntown,
Hummels Wharf, Montandon, Kreamer, Port Trevorton, Penns Creek, Mount
Pleasant Mills, Kratzerville, Vicksburg and Stonington.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building.
This storm may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.
&&
LAT...LON 4094 7707 4101 7676 4076 7655 4066 7700
TIME...MOT...LOC 2034Z 339DEG 12KT 4092 7684
MAX HAIL SIZE...0.75 IN
MAX WIND GUST...50 MPH
MartinThe State College radar (KCCX), 92 km away, was scanning. The volume nearest the first event began at 20:47 UTC.
10 hail, 8 thunderstorm wind. Local standard time, as filed.
A severe thunderstorm producing winds estimated near 60 mph knocked down trees and wires near East Buffalo Township.
A severe thunderstorm producing winds estimated near 60 mph knocked down multiple trees near Richfield.
A severe thunderstorm producing winds estimated near 60 mph knocked down trees and wires across a road near Richfield.
A severe thunderstorm produced ping-pong ball sized hail along Route 35 between Richfield and Mount Pleasant Mills.
A severe thunderstorm producing winds estimated near 60 mph knocked down a tree and wires.
A severe thunderstorm produced ping-pong ball sized hail near Canoe Creek State Park.
A severe thunderstorm produced ping-pong ball sized hail north of Dehart Dam.
A severe thunderstorm producing winds estimated near 60 mph knocked down power lines near Carsonville.
A severe thunderstorm produced quarter-sized hail in Hollidaysburg.
A severe thunderstorm produced ping-pong ball sized hail near Linglestown.
A severe thunderstorm producing winds estimated near 60 mph knocked down a traffic light onto a road near Paxtonia.
A severe thunderstorm produced ping-pong ball sized hail north of I-81 just east of Harrisburg.
A severe thunderstorm produced half dollar sized hail (1.25) near Harrisburg.
A severe thunderstorm produced golf ball sized hail (1.75) near Harrisburg.
A severe thunderstorm producing winds estimated near 60 mph combined with severe hail to damage the door and windows of a business near Harrisburg.
A severe thunderstorm producing winds estimated near 60 mph produced multiple reports of trees and wires down across Dauphin County.
A severe thunderstorm produced quarter-sized hail near Harrisburg.
A thunderstorm produced nickel-sized hail near Harrisburg.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Pennsylvania in 2023Every state in 2023This day in weather historyWarnings in Pennsylvania, June 2023
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: 1099029, 1099030, 1099031, 1094107, 1099033, 1094108, 1094109, 1099034, 1094110, 1094111, 1099037, 1094112, 1094113, 1094114, 1099035, 1099036, 1094115, 1094116.