Scattered thunderstorms developed in a moderate-to-high CAPE, but relatively low shear, environment over eastern Pennsylvania during the afternoon of July 6, 2021. Sporadic wind damage was reported from a few storms, along with half dollar-sized hail in Hershey.
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.
Scattered thunderstorms developed in a moderate-to-high CAPE, but relatively low shear, environment over eastern Pennsylvania during the afternoon of July 6, 2021. Sporadic wind damage was reported from a few storms, along with half dollar-sized hail in Hershey.
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 Jul 6, 1:31 PM EST, 59 minutes earlier.
Area Forecast Discussion National Weather Service State College PA 231 PM EDT Tue Jul 6 2021 .SYNOPSIS... Hot and humid conditions today and Wednesday will trend seasonably cooler Thursday and Friday. Rounds of showers and thunderstorms will last through the end of the week with Saturday looking like the best chance for a dry day. Unsettled weather returns by the end of the weekend with more periods of rain and storms into early next week. && .NEAR TERM /THROUGH TONIGHT/... 2pm update... Severe Thunderstorm Watches have been hoisted for the northeastern counties through 8pm and southeastern counties through 10pm. First round of thunderstorms has moved across the northern tier and is pushing through Tioga County currently. These storms have a history of some gusts to 45 mph but are in a weakening phase. Behind them, the airmass is quickly recovering and destabilizing once again, as evidenced by a new cluster of convection developing in Warren and McKean Counties. Will keep an eye on these and see if the instability can get large enough behind the first round of convection to support severe thunderstorms late this afternoon and evening. The primary hazard will be gusty winds. From previous... Heat advisory remains in effect for the Lower Susq Valley through 7 PM for heat index values near or slightly above 100F. Temps of 18-20C at 850 mb support high temps in the mid 90s in the southeastern valleys given full sunshine. Remaining mindful of the smoke and haze in the sky, we do continue to shave a degree or two off the NBM temperature guidance. Another forecast challenge is how much drier air from aloft will mix down during peak heating. Unlike our previous heat wave at the end of June, which had a source region in the deep tropics, the hot airmass over us today actually spilled over from the western ridge that brought heat to the Pacific coast last week. Back trajectories show this airmass moving down from British Columbia and south central Canada (where there are several ongoing wildfires, which explains the smoky skies locally). This time around, the moisture is a bit more shallow and there is a higher potential for lower dewpoint air to mix down during peak heating / peak PBL depth during the afternoon. Nevertheless, it will be a hot day. After the severe threat this afternoon and evening, hires model data shows convection fading over the southern portion of CPA after midnight. Look for another muggy night with lows 65-75F or +10F above early July climo. && .SHORT TERM /WEDNESDAY/... An upper shortwave trough is fcst to pivot eastward across the Great Lakes/Midwest on Wednesday. Ample low level moisture and instability will fuel showers and thunderstorms. SPC has highlighted the northeast quadrant of the CWA with a MRGL SWO with sporadic strong/damaging wind threat on Wednesday afternoon.and WPC has a good portion of the area in a MRGL ERO Wed and Thu. Heavy downpours should remain progressive on Wed with a low risk of flooding. The primary concern this period centers around potential for a PRE later on D2 into D3 although there is considerable model uncertainty on the evolution of the two aforementioned features of interest. Regardless of the details, at this point measurable rainfall is very likely on Thursday with categorical POPs supported by a multi-model blend. MaxTs should peak on Wednesday with HX values making around run toward 100F in the central and southeast valleys. Trend of very warm and muggy nights will continue with max T falling back about 10F on Thursday due to cloud cover/probable rain showers. && .LONG TERM /WEDNESDAY NIGHT THROUGH MONDAY/... Latest NHC track of TS Elsa is consistent keeps it south of the CWA - going offshore around the DelMarVa peninsula early Friday morning. But, the plume of higher/tropical moisture will likely give us extra juice for the showers and storms which form on Thursday. The heavy rain puts us in a MRGL risk for flash flooding for Thurs. The persistent frontal boundary just to our north will drop southward for a brief time from late Friday into late Sat, perhaps helped by Elsa as she passes off to the east, pulling in the drier air from the NW. Muggy air Wed night will keep temps in the 60s and l70s. Despite the tropical nature of our airmass on Thursday, the temps will stay in the 70s in the NW half of the area. The maxes should get into the 80s again for the rest of the area with Heat Index running in the m90s at highest. Temps Friday should be similar to Thursday with rain showers fcst to pull away from the area Friday night behind the weak front. Conditions on Saturday improve slightly, with another chance of afternoon showers and thunderstorms. By Sunday/Monday, another upper-level trough and surface low-pressure system will contribute to showers and thunderstorms for the start of next week. && .AVIATION /19Z TUESDAY THROUGH SUNDAY/... SHRA/TSRA have developed early this afternoon across the northern tier. One round of TSRA moved through BFD earlier and there can still be a few pop up SHRA or TSRA there this afternoon. Expanded VCTS farther south to IPT, UNV, MDT and LNS this afternoon and evening, main impacts from any TSRA would be brief reductions in visibility and gusty winds. Potential for some patchy fog late tonight where it rains this afternoon and evening, otherwise VFR conditions expected. Outlook... Wed...Another hot, humid day with high density altitudes. There is another chance of scattered restrictions in aftn SHRA/TSRA. Thu-Fri...Occasional restrictions likely with a good chance of SHRA/TSRA. Sat...Improved conditions, although a few SHRA/TSRA remain possible. && .CTP WATCHES/WARNINGS/ADVISORIES... Heat Advisory until 6 PM EDT this evening for PAZ036-056-057- 059-063>066. && SYNOPSIS...Steinbugl NEAR TERM...Steinbugl/Colbert SHORT TERM...Steinbugl/Colbert LONG TERM...Dangelo/Colbert AVIATION...Martin/Travis
Hazardous Weather Outlook National Weather Service State College PA 140 PM EDT Tue Jul 6 2021 PAZ004-005-010-017-024>026-033>035-071745- Warren-McKean-Elk-Clearfield-Cambria-Blair-Huntingdon-Somerset- Bedford-Fulton- 140 PM EDT Tue Jul 6 2021 This Hazardous Weather Outlook is for central Pennsylvania. .DAY ONE...This afternoon and tonight. The probability for widespread hazardous weather is low. .DAYS TWO THROUGH SEVEN...Wednesday through Monday. Locally heavy rainfall and isolated flooding are possible Wednesday into Thursday. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time. PAZ057-059-065-066-071745- Dauphin-Lebanon-York-Lancaster- 140 PM EDT Tue Jul 6 2021 ...HEAT ADVISORY IN EFFECT UNTIL 6 PM EDT THIS EVENING... ...SEVERE THUNDERSTORM WATCH 336 IN EFFECT UNTIL 10 PM EDT THIS EVENING... This Hazardous Weather Outlook is for central Pennsylvania. .DAY ONE...This afternoon and tonight. Please listen to NOAA Weather Radio or go to weather.gov/StateCollege on the internet for more information about the following hazards. Heat Advisory. Severe Thunderstorm Watch. .DAYS TWO THROUGH SEVEN...Wednesday through Monday. The heat index will approach 100 degrees Wednesday afternoon. Locally heavy rainfall and isolated flooding are possible Wednesday into Thursday. .SPOTTER INFORMATION STATEMENT... Spotters are encouraged to report significant hazardous weather. PAZ011-012-018-019-027-028-045-049-050-071745- Cameron-Northern Clinton-Northern Centre-Southern Centre-Mifflin- Juniata-Southern Clinton-Union-Snyder- 140 PM EDT Tue Jul 6 2021 This Hazardous Weather Outlook is for central Pennsylvania. .DAY ONE...This afternoon and tonight. The probability for widespread hazardous weather is low. .DAYS TWO THROUGH SEVEN...Wednesday through Monday. Isolated strong to severe storms are possible Wednesday afternoon. Locally heavy rainfall and isolated flooding are possible Wednesday into Thursday. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time. PAZ006-037-041-042-046-051>053-071745- Potter-Tioga-Northern Lycoming-Sullivan-Southern Lycoming-Montour- Northumberland-Columbia- 140 PM EDT Tue Jul 6 2021 ...SEVERE THUNDERSTORM WATCH 335 IN EFFECT UNTIL 8 PM EDT THIS EVENING... This Hazardous Weather Outlook is for central Pennsylvania. .DAY ONE...This afternoon and tonight. Please listen to NOAA Weather Radio or go to weather.gov/StateCollege on the internet for more information about the following hazards. Severe Thunderstorm Watch. .DAYS TWO THROUGH SEVEN...Wednesday through Monday. Isolated strong to severe storms are possible Wednesday afternoon. Locally heavy rainfall and isolated flooding are possible Wednesday into Thursday. .SPOTTER INFORMATION STATEMENT... Spotters are encouraged to report significant hazardous weather. PAZ058-071745- Schuylkill- 140 PM EDT Tue Jul 6 2021 ...SEVERE THUNDERSTORM WATCH 336 IN EFFECT UNTIL 10 PM EDT THIS EVENING... This Hazardous Weather Outlook is for central Pennsylvania. .DAY ONE...This afternoon and tonight. Please listen to NOAA Weather Radio or go to weather.gov/StateCollege on the internet for more information about the following hazards. Severe Thunderstorm Watch. .DAYS TWO THROUGH SEVEN...Wednesday through Monday. Isolated strong to severe storms are possible Wednesday afternoon. Locally heavy rainfall and isolated flooding are possible Wednesday into Thursday. .SPOTTER INFORMATION STATEMENT... Spotters are encouraged to report significant hazardous weather. PAZ036-056-063-064-071745- Franklin-Perry-Cumberland-Adams- 140 PM EDT Tue Jul 6 2021 ...HEAT ADVISORY IN EFFECT UNTIL 6 PM EDT THIS EVENING... This Hazardous Weather Outlook is for central Pennsylvania. .DAY ONE...This afternoon and tonight. Please listen to NOAA Weather Radio or go to weather.gov/StateCollege on the internet for more information about the following hazards. Heat Advisory. Locally heavy rainfall and isolated flooding are possible late this afternoon into early tonight. .DAYS TWO THROUGH SEVEN...Wednesday through Monday. The heat index will approach 100 degrees Wednesday afternoon. Locally heavy rainfall and isolated flooding are possible Wednesday into Thursday. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time.
Special Weather Statement National Weather Service State College PA 1245 PM EDT Tue Jul 6 2021 PAZ005-006-061730- McKean PA-Potter PA- 1245 PM EDT Tue Jul 6 2021 ...A STRONG THUNDERSTORM WILL AFFECT PARTS OF MCKEAN AND POTTER COUNTIES UNTIL 130 PM EDT... At 1245 PM EDT, Doppler radar indicated a strong thunderstorm over Coryville, moving east at 35 mph. Pea size hail and wind gusts of 50 to 55 mph are possible. Locations impacted include... Coudersport, Port Allegany, Shinglehouse, Genesee, Denton Hill State Park, Coryville, Eldred, Ulysses, Sweden Valley, Oswayo, Ceres and Ski Denton Ski Area. LAT...LON 4200 7774 4174 7782 4183 7847 4200 7845 TIME...MOT...LOC 1645Z 275DEG 29KT 4192 7836 Travis
Special Weather Statement National Weather Service State College PA 126 PM EDT Tue Jul 6 2021 PAZ006-037-041-061800- Potter PA-Northern Lycoming PA-Tioga PA- 126 PM EDT Tue Jul 6 2021 ...STRONG THUNDERSTORMS WILL AFFECT PARTS OF POTTER...NORTHERN LYCOMING...AND TIOGA COUNTIES UNTIL 200 PM EDT... At 126 PM EDT, Doppler radar indicated strong thunderstorms along a line extending from near Whitesville to near Cherry Springs State Park. Movement was east at 40 mph. Pea size hail and wind gusts of 50 to 55 mph are possible. Locations impacted include... Wellsboro, Morris, Elkland, Galeton, Westfield, Gaines, Keeneyville, Leetonia, Harrison Valley, Cherry Springs State Park, Leonard Harrison State Park, Denton Hill State Park, Cedar Run, Ole Bull State Park, Slate Run, Lyman Run State Park, Knoxville, Ulysses, Osceola and Ski Denton Ski Area. PRECAUTIONARY/PREPAREDNESS ACTIONS... These storms 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 4144 7734 4154 7795 4200 7782 4200 7719 TIME...MOT...LOC 1726Z 277DEG 35KT 4197 7774 4160 7783 Dangelo
Special Weather Statement
National Weather Service State College PA
151 PM EDT Tue Jul 6 2021
PAZ004-061815-
Warren PA-
151 PM EDT Tue Jul 6 2021
...A STRONG THUNDERSTORM WILL AFFECT CENTRAL WARREN COUNTY UNTIL 215
PM EDT...
At 150 PM EDT, Doppler radar indicated a strong thunderstorm over
Youngsville, moving east at 35 mph.
Wind gusts of 50 to 55 mph and penny size hail are possible.
Locations impacted include...
Warren, Youngsville, Russell, Scandia, Warren South, Kinzua Dam,
Starbrick and Clarendon.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
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 4195 7891 4184 7892 4183 7892 4183 7895
4176 7895 4175 7896 4179 7934 4187 7935
4198 7892
TIME...MOT...LOC 1750Z 263DEG 30KT 4184 7927
DangeloSpecial Weather Statement
National Weather Service State College PA
221 PM EDT Tue Jul 6 2021
PAZ004-005-061915-
McKean PA-Warren PA-
221 PM EDT Tue Jul 6 2021
...STRONG THUNDERSTORMS WILL AFFECT MUCH OF MCKEAN AND WARREN
COUNTIES...
At 217 PM EDT, Doppler radar indicated strong thunderstorms over
northern parts of McKean and Warren counties. The strongest
storm was just east of the city of Warren, moving east at 50 mph.
Any of these storms could produce nickel size hail and wind gusts of
50 to 55 mph. The storms will move generally to the east, but
additional storms could form as well.
Locations impacted include...
Warren, Bradford, Kane, Allegany State Park, Port Allegany,
Sheffield, Columbus, Youngsville, Smethport, Wetmore, Russell,
Shinglehouse, Betula, Spring Creek, Rew, Crosby, Ludlow, Marshburg,
Kinzua Bridge State Park and Scandia.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
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 4200 7820 4162 7820 4162 7841 4160 7842
4160 7848 4163 7849 4163 7961 4200 7960
TIME...MOT...LOC 1817Z 263DEG 49KT 4185 7908
DangeloSpecial Weather Statement
National Weather Service State College PA
301 PM EDT Tue Jul 6 2021
PAZ042-061945-
Sullivan PA-
301 PM EDT Tue Jul 6 2021
...A STRONG THUNDERSTORM WILL AFFECT PARTS OF SULLIVAN COUNTY UNTIL
345 PM EDT...
At 301 PM EDT, Doppler radar indicated a strong thunderstorm near
Lincoln Falls, moving east at 40 mph.
Pea size hail and wind gusts of 50 to 55 mph are possible.
Locations impacted include...
Ricketts Glen State Park, Lincoln Falls, Shunk, Dushore, Laporte,
Forksville, Eagles Mere and Hillsgrove.
LAT...LON 4134 7630 4146 7677 4149 7678 4158 7675
4154 7622
TIME...MOT...LOC 1901Z 279DEG 35KT 4157 7661
TravisSpecial Weather Statement
National Weather Service State College PA
317 PM EDT Tue Jul 6 2021
PAZ041-042-046-053-062000-
Columbia PA-Southern Lycoming PA-Sullivan PA-Northern Lycoming PA-
317 PM EDT Tue Jul 6 2021
...A STRONG THUNDERSTORM WILL AFFECT PARTS OF COLUMBIA...SOUTHERN
LYCOMING...SULLIVAN...AND NORTHERN LYCOMING COUNTIES UNTIL 400 PM
EDT...
At 316 PM EDT, Doppler radar indicated a strong thunderstorm over
Barbours, moving southeast at 30 mph.
Wind gusts of 50 to 55 mph are possible.
Locations impacted include...
Jamison City, Waller, Kettle Creek Gorge, Biggertown, Lairdsville,
Central, Muncy Valley, Barbours, Picture Rocks, Eagles Mere and
Hillsgrove.
LAT...LON 4130 7631 4115 7657 4140 7693 4147 7680
4134 7630
TIME...MOT...LOC 1916Z 298DEG 25KT 4139 7682
TravisThe Binghamton radar (KBGM), 83 km away, was scanning. The volume nearest the first event began at 19:29 UTC.
5 thunderstorm wind, 1 hail. Local standard time, as filed.
A severe thunderstorm producing winds estimated near 60 mph knocked down multiple trees, branches and wires along Route 487 between East Cherry Street and Connells Dam Road in Dushore.
A severe thunderstorm producing winds estimated near 60 mph knocked down several trees in the 1300 block of Elk Grove Road in Sugarloaf Township.
A severe thunderstorm producing winds estimated near 60 mph knocked down a large tree across Jamison City Road.
A severe thunderstorm produced half dollar-sized hail in Hershey.
A severe thunderstorm producing winds estimated near 60 mph knocked down multiple trees south of Campbelltown.
A severe thunderstorm producing winds estimated near 60 mph knocked down multiple trees across roads and one onto a house southwest of Campbelltown.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Pennsylvania in 2021Every state in 2021This day in weather historyWarnings in Pennsylvania, July 2021
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: 959231, 959232, 959234, 959228, 959235, 959236.