Upper trough moving across the region coincided with an area of low CAPE but high shear, which supported the development of a weak tornado over Clarion county, Pennsylvania on June 19th. Damage from the tornado was primarily to trees, though a few outbuildings were also damaged.
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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 PBZ wrote it up.
Upper trough moving across the region coincided with an area of low CAPE but high shear, which supported the development of a weak tornado over Clarion county, Pennsylvania on June 19th. Damage from the tornado was primarily to trees, though a few outbuildings were also damaged.
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 Pittsburgh, PA wrote its last area forecast discussion before the first event at Jun 18, 8:17 PM EST, 3 hours 51 minutes earlier.
Area Forecast Discussion National Weather Service Pittsburgh PA 917 PM EDT Sun Jun 18 2017 .SYNOPSIS... Several rounds of showers and thunderstorms expected into Monday morning as a cold front moves through. Less humid and cooler weather is forecast early next week. && .NEAR TERM /UNTIL 6 AM MONDAY MORNING/... Showers and thunderstorms will continue overnight as a slow moving cold front approaches from the west. Current convection developed ahead of the surface front, and is beginning to fill in spatially over eastern Ohio. Adjusted PoPs to current radar trends and towards latest HRRR output, which has handled this event well so far. With the severe threat all but over, the focus overnight will turn to the potential for localized water issues. The slow moving boundary will allow areas to receive several rounds of showers/thunderstorms into Monday morning. This is especially a concern for areas still drying out after several rounds of rain this past week. Will need to monitor the precipitation totals closely overnight. Temperatures will remain well above average, as we remain ahead of the cold front with plenty of cloud coverage. && .SHORT TERM /6 AM MONDAY MORNING THROUGH WEDNESDAY/... Front will finally be south of the ridges around noon Monday, but a shortwaves digging through the upper trough may support scattered showers/storms each afternoon through midweek. Surface ridging may keep the best chances to north of PIT by Wednesday. Upper trough will keep temperatures a degree or two below seasonal averages Monday, but moderation back to normal is expected by midweek. && .LONG TERM /WEDNESDAY NIGHT THROUGH SUNDAY/... Although the deep moisture is vacated, a mean upper trough will be maintained in the Great Lakes region. This trough will create a progressive flow across the Ohio Valley, leading to daily chances for showers and storms through much of the week. By Thursday, temperature will rebound to slightly above-normal value as low-level moisture increases. The highest chance for showers and storms will come toward the end of the long term with the passage of a frontal boundary. && .AVIATION /01Z MONDAY THROUGH FRIDAY/... Additional showers and storms will move through the region tonight and Monday as a cold front completes passage. Brief periods of evening MVFR can be expected with deterioration thereafter as the front encroaches. Overall rain coverage will diminish on Monday morning and a slow improvement to VFR is anticipated although scattered showers may linger. .Outlook... Brief restrictions are possible through mid week as an upper trough slides over the region. && .PBZ WATCHES/WARNINGS/ADVISORIES... MD...None. OH...None. PA...None. WV...None. &&
Hazardous Weather Outlook National Weather Service Pittsburgh PA 919 PM EDT Sun Jun 18 2017 MDZ001-OHZ039>041-048>050-057>059-068-069-PAZ007>009-013>016-020>023- 029-031-073>076-WVZ001>004-012-021-509>514-200130- Garrett-Tuscarawas-Carroll-Columbiana-Coshocton-Harrison-Jefferson- Muskingum-Guernsey-Belmont-Noble-Monroe-Mercer-Venango-Forest- Lawrence-Butler-Clarion-Beaver-Allegheny-Armstrong-Indiana- Washington-Greene-Westmoreland-Westmoreland Ridges-Fayette- Fayette Ridges-Hancock-Brooke-Ohio-Marshall-Wetzel-Marion-Monongalia- Ridges of Eastern Monongalia and Northwestern Preston-Preston- Eastern Preston-Western Tucker-Eastern Tucker- 919 PM EDT Sun Jun 18 2017 This Hazardous Weather Outlook is for western Maryland, east central Ohio, northwest Pennsylvania, southwest Pennsylvania, west central Pennsylvania, western Pennsylvania, northern West Virginia and northern panhandle of West Virginia. .DAY ONE...Tonight. Showers and thunderstorms overnight will be capable of producing heavy rain, which could lead to flooding. .DAYS TWO THROUGH SEVEN...Monday through Saturday. No hazardous weather is expected at this time. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time.
The Pittsburgh radar (KPBZ), 69 km away, was scanning. The volume nearest the first event began at 05:08 UTC.
3 flood, 1 tornado. Local standard time, as filed.
State official reported multiple road closures throughout Mercer county with Pine Township and Grove City the hardest hit areas.
State official reported that US 62 was closed from State route 157 to State route 257 due to flooding. Residents are trapped in their homes along US62.
Emergency manager reported that Cool Spring Creek and Otter Creek were out of their banks. Flooding was reported at Plantation Park campground, with some water rescues taking place.
A survey conducted by the National Weather Service in Pittsburgh concluded that a tornado occurred Monday evening, June 19th, in Elk Township in Clarion county. A weak tornado touchdown occurred Monday evening along Millerstown Road in Elk Township Clarion county. There were several reported sitings of a funnel cloud along with one person confirming it reached the ground. The only structural damage was |to outbuildings and barns with sheet metal roofs. Hardwood trees were used to determine the rating as numerous trees were uprooted or snapped along the north side of Millerstown Road. The storm tracked across Millerstown Road just east of the 598 postal address and uprooted and snapped several additional trees before lifting just prior to the reaching Pine City Road.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Pennsylvania in 2017Every state in 2017This day in weather historyThe tornado archive for Pennsylvania, 2017Warnings 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: 711715, 711716, 711717, 711650.