Widely scattered thunderstorms developed in a hot and humid airmass over central Pennsylvania during the afternoon of June 13, 2017. A couple of the storms produced reports of wind damage, one report in Cambria County and the other in Lycoming.
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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.
Widely scattered thunderstorms developed in a hot and humid airmass over central Pennsylvania during the afternoon of June 13, 2017. A couple of the storms produced reports of wind damage, one report in Cambria County and the other in Lycoming.
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 13, 2:14 PM EST, 2 hours 37 minutes earlier.
Area Forecast Discussion National Weather Service State College PA 314 PM EDT Tue Jun 13 2017 .SYNOPSIS... A cool front dropping south across the region will help trigger scattered showers and thunderstorms this afternoon into tonight, and then cool temperatures down for the middle of the week. A trough aloft and a warm front are expected to impact the region by the end of the week, keeping mention of showers and thunderstorms in the forecast into the weekend. && .NEAR TERM /UNTIL 6 AM WEDNESDAY MORNING/... Hot and humid airmass currently in place over central PA will push max temps to near records in many locations this afternoon. Heat Indices will peak in the upper 90s over the lower Susq Valley with dewpoints in the 60s. Back door cool frontal boundary will slip slowly southward across central PA into tonight. But with mid levels being so warm, question continues to be just how much convection will be able to fire. CAPE is not bad, but shear is very low. This will not inhibit convection from developing, and generally progressing from NW to SE, but it will limit potential for just how strong the strongest storms could get. Expect a few storms to potentially produce isolated gusty winds and maybe small hail - and slower progression of storms may bring localized heavy rainfall in this high PWAT airmass. So marginal SVR threat still seems OK across the northern half and will continue mention in the HWO. Convection coverage should peak late this afternoon and gradually become less overnight as it trends toward the SW and SE corners of CWA. Lows will remain very mild around 70 for the SE, with cooler temps in the upper 50s and lower 60s behind the front north of I-80. && .SHORT TERM /6 AM WEDNESDAY MORNING THROUGH 6 PM WEDNESDAY/... The front will start to drag over wrn PA and there will be a higher chance of shra/tsra on Wed there. MRGL risk shifts to SW third of the state, catching the Laurel Highlands. The shear will still be low and the CAPE is also supposed to be lower. The front should provide a focus and lift, but could still not be enough to overcome an even thicker layer of stable air in the lowest 4kft on Wed. Will keep POPs in the chc range except for the highest elevs of the Laurels. Temps should top out in the u70s/l80s. && .LONG TERM /WEDNESDAY NIGHT THROUGH TUESDAY/... The large scale pattern overview will feature a replacement of above normal heights/upper ridge over the Great Lakes with a modestly strong mid/upper level trough by early next week. With very minor fluctuations in the 500mb flow, sensible wx will be influenced by a complex surface pattern consisting of a NW-SE oriented quasi-stationary boundary near/south of the PA/MD border pivoting and lifting back to the north as a warm front through the end of the week. Models continue to show an intrusion of relatively cool/stable air settling east of the Alleghenies through midweek with rain risk gradually increasing in somewhat of a clockwise fashion from SW to NW Wed ngt-Thu then spreading eastward Thu ngt-Fri. A cooler temperature trend is expected Wed to Fri but departures from average will only be ~1-5 degrees below mid-June climatology. Warmer and more humid air will return to central PA this weekend via deep southwest flow in advance of a cold front pushing eastward through the Great Lakes/Midwest. This should correspond to an increase in shower/thunderstorm activity with max POPs focused around FROPA Sunday into Monday. There are timing differences in the models so the most likely pcpn timing may change faster/slower in the coming days. What is more certain is an upward trend in temperatures with ensemble data supporting +18-20C at 850mb which should translate into mid 80s to low 90s for daytime highs Sunday and possibly Monday depending on FROPA timing. Heat index values well into the 90s would seem probable with this scenario in the urban corridors to the southeast of I-81 (Harrisburg/York/Lancaster). The hot spell appears to be short in duration with some relief arriving by next Tue/6-20. && .AVIATION /19Z TUESDAY THROUGH SUNDAY/... VFR conditions continue across majority of central PA at 18z with high-based cumulus field filling in. Broken line of convection beginning to form off of Lake Erie will impact northern half of CWA this afternoon into early evening with short periods of restrictions poss. More isolated showers/ thunderstorms expected to pop up over the south, which may continue through the evening hours. .OUTLOOK... Wed...AM low cigs/fog poss western Mtns. Isolated tsra impacts possible southwest PA. Thu...Low cigs poss central Mtns, especially AM and after dark. Fri...Low cigs, showers/tstorms possible, mainly in the AM. Sat-Sun...Patchy AM fog possible. Isold PM tsra impacts possible. && .CLIMATE... Record high at Harrisburg (95F in 1956) is in jeopardy this afternoon. More information will be available with the evening climate summary issued around 530pm EDT. && .CTP WATCHES/WARNINGS/ADVISORIES... None. && SYNOPSIS...RXR NEAR TERM...RXR SHORT TERM...RXR LONG TERM...Steinbugl AVIATION...RXR CLIMATE...Steinbugl
Hazardous Weather Outlook National Weather Service State College PA 824 AM EDT Tue Jun 13 2017 PAZ004-010-017>019-141230- Warren-Elk-Clearfield-Northern Centre-Southern Centre- 824 AM EDT Tue Jun 13 2017 This Hazardous Weather Outlook is for central Pennsylvania. .DAY ONE...Today and Tonight. Scattered strong to severe thunderstorms with gusty winds and hail are possible afternoon and evening. .DAYS TWO THROUGH SEVEN...Wednesday through Monday. Scattered strong to severe thunderstorms with gusty winds and hail are possible Wednesday afternoon and evening. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time. PAZ005-006-011-012-037-041-042-045-046-049>053-058-141230- McKean-Potter-Cameron-Northern Clinton-Tioga-Northern Lycoming- Sullivan-Southern Clinton-Southern Lycoming-Union-Snyder-Montour- Northumberland-Columbia-Schuylkill- 824 AM EDT Tue Jun 13 2017 This Hazardous Weather Outlook is for central Pennsylvania. .DAY ONE...Today and Tonight. Scattered strong to severe thunderstorms with gusty winds and hail are possible afternoon and evening. .DAYS TWO THROUGH SEVEN...Wednesday through Monday. No hazardous weather is expected at this time. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time. PAZ024>028-033>036-056-063>065-141230- Cambria-Blair-Huntingdon-Mifflin-Juniata-Somerset-Bedford-Fulton- Franklin-Perry-Cumberland-Adams-York- 824 AM EDT Tue Jun 13 2017 This Hazardous Weather Outlook is for central Pennsylvania. .DAY ONE...Today and Tonight. No hazardous weather is expected at this time. .DAYS TWO THROUGH SEVEN...Wednesday through Monday. Scattered strong to severe thunderstorms with gusty winds and hail are possible Wednesday afternoon and evening. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time. PAZ057-059-066-141230- Dauphin-Lebanon-Lancaster- 824 AM EDT Tue Jun 13 2017 This Hazardous Weather Outlook is for central Pennsylvania. .DAY ONE...Today and Tonight. No hazardous weather is expected at this time. .DAYS TWO THROUGH SEVEN...Wednesday through Monday. No hazardous weather is expected at this time. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time.
The State College radar (KCCX), 64 km away, was scanning. The volume nearest the first event began at 21:51 UTC.
2 thunderstorm wind. Local standard time, as filed.
A severe thunderstorm producing winds estimated near 60 mph knocked down four trees across roads in Patton along Route 36.
A severe thunderstorm producing winds estimated near 60 mph knocked down a tree and a pole in Williamsport.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Pennsylvania in 2017Every state in 2017This day in weather historyWarnings in Pennsylvania, June 2017
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: 694854, 694857.