Scattered showers and thunderstorms developed in a warm and very humid airmass across central Pennsylvania during the evenings of June 15th and 16th, 2017. The primary threat was heavy rain, but an isolated wind damage report was received from Centre County.
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 showers and thunderstorms developed in a warm and very humid airmass across central Pennsylvania during the evenings of June 15th and 16th, 2017. The primary threat was heavy rain, but an isolated wind damage report was received from Centre County. A few flash floods were reported. For the second evening in a row, Johnstown had intense downpours (1.16/15 min) that brought flash flooding.
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 16, 2:34 PM EST, 2 hours 47 minutes earlier.
Area Forecast Discussion National Weather Service State College PA 334 PM EDT Fri Jun 16 2017 .SYNOPSIS... An unsettled weather pattern will remain over the state into early next week. Look for showers and thunderstorms to develop each afternoon as well. A cold front will move through the area early in the work week bringing cooler and drier conditions. && .NEAR TERM /UNTIL 6 AM SATURDAY MORNING/... Showers and thunderstorms increasing in coverage and intensity early this afteroon. Most of central and southern areas of the forecast area can expect to see rainfall for a while this afternoon into early evening. Some of the rainfall will bring brief heavy downpours. Flash flood guidance is rather high for the southeast half of the forecast area in response to the recent dry weather. This should help reduce the flood potential, but any storms that train or move slow enough are capable of producing minor flooding for the remainder of the afternoon. Look for showers to decrease in intensity after sunset with another muggy and mild night with valley fog formation closer to sunrise. && .SHORT TERM /6 AM SATURDAY MORNING THROUGH SATURDAY NIGHT/... Atmosphere changes little Saturday with abundant low level moisture in place. Diurnally driven showers and thunderstorms are expected for form again, especially across the southern half of the state. Look for warm temperatures well into the 80s by the afternoon. Broken record for the overnight hours with mild and humid conditions with more fog formation late. && .LONG TERM /SUNDAY THROUGH FRIDAY/... Model and ensemble guidance remain in good agreement on the development of a modestly strong mid/upper level trough over the Great Lakes by Monday, with multiple waves progressing around the base of the trough and ejecting northeast into Canada. The most likely period for showers and thunderstorms (Sun-Mon) will focus along the associated surface cold front which is progged to slowly push southeast and reach the Mid Atlantic coast by 20/12z. Precipitation will be focused mainly to the west of the Appalachians on Sunday before shifting east on Monday. Temperatures are fcst to trend above average over the weekend with max readings in the mid 80s to low 90s on Sunday. Max heat index is projected to reach the mid/upper 90s across portions of the mid- lower Susquehanna Valley. Unlike the recent heat episode, the duration of hot temperatures will be shorter and last 2 days at most (limited area-SEPA). Lower humidity and near average temperatures are likely following the cold frontal passage into the middle part of next week. Another shortwave is fcst to rotate through the trough around midweek before the upper level pattern turns more zonal by the end of next week. && .AVIATION /20Z FRIDAY THROUGH WEDNESDAY/... Look for scattered showers and thunderstorms across the region this afternoon and evening and again on Saturday and Sunday. Valley fog formation close to sunrise each morning as well. .OUTLOOK... Sat...AM cig/fog restrictions. PM TSRA impacts SE. Sun...Patchy AM fog east. PM TSRA impacts NW half. Mon...TSRA impacts, esp SE half. Tue...SHRA NW. No sig wx. && .CTP WATCHES/WARNINGS/ADVISORIES... None. && SYNOPSIS...Ross NEAR TERM...Ross SHORT TERM...Ross LONG TERM...Fitzgerald/Gartner AVIATION...Ross
Hazardous Weather Outlook National Weather Service State College PA 552 AM EDT Fri Jun 16 2017 PAZ004>006-010>012-017>019-024>028-033>037-041-042-045-046-049>053- 056>059-063>066-171000- Warren-McKean-Potter-Elk-Cameron-Northern Clinton-Clearfield- Northern Centre-Southern Centre-Cambria-Blair-Huntingdon-Mifflin- Juniata-Somerset-Bedford-Fulton-Franklin-Tioga-Northern Lycoming- Sullivan-Southern Clinton-Southern Lycoming-Union-Snyder-Montour- Northumberland-Columbia-Perry-Dauphin-Schuylkill-Lebanon-Cumberland- Adams-York-Lancaster- 552 AM EDT Fri Jun 16 2017 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...Saturday through Thursday. Severe thunderstorms with damaging wind gusts, large hail and locally excessive rainfall are possible late Sunday, mainly across the northwest half of Pennsylvania. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time.
Special Weather Statement National Weather Service State College PA 432 PM EDT FRI JUN 16 2017 PAZ024-025-162115- Blair PA-Cambria PA- 432 PM EDT FRI JUN 16 2017 ...SPECIAL WEATHER STATEMENT... At 431 PM EDT, Doppler radar indicated a strong thunderstorm over Loretto, moving northeast at 25 mph. Torrential rain is expected. Pea size hail and winds in excess of 30 mph are possible. Locations impacted include... Portage, Ebensburg, Altoona, Loretto, Gallitzin, Horseshoe Curve, Prince Gallitzin State Park, Cresson, Sankertown, Lilly, Tunnelhill, Cassandra, Chest Springs, Ashville, Colver, Peoples Natural Gas Field, Allegheny Portage Railroad National Historic Site, Penn State Altoona, Saint Francis University and Mt. Aloysius College. PRECAUTIONARY/PREPAREDNESS ACTIONS... Torrential rainfall is also occurring with this storm, and may lead to localized flooding. Do not drive your vehicle through flooded roadways. This area received heavy rain last evening and very wet. && LAT...LON 4068 7854 4050 7831 4038 7868 4052 7882 TIME...MOT...LOC 2031Z 233DEG 23KT 4051 7866 Evanego
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE STATE COLLEGE PA
537 PM EDT FRI JUN 16 2017
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0536 PM FLASH FLOOD JOHNSTOWN 40.33N 78.92W
06/16/2017 CAMBRIA PA 911 CALL CENTER
NUMEROUS ROAD CLOSURES DOWNTOWN JOHNSTOWN
&&
EVENT NUMBER CTP1701211
PAHPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE STATE COLLEGE PA
539 PM EDT FRI JUN 16 2017
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0537 PM FLASH FLOOD PINECROFT 40.57N 78.35W
06/16/2017 BLAIR PA 911 CALL CENTER
LOWER RIGGLES GAP ROAD CLOSED DUE TO FLOODING AND
DEBRIS ON THE ROAD
&&
EVENT NUMBER CTP1701212
PAHPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE STATE COLLEGE PA
541 PM EDT FRI JUN 16 2017
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0540 PM FLASH FLOOD WINDBER 40.23N 78.83W
06/16/2017 SOMERSET PA PUBLIC
STREAM OVERFLOWING ONTO JONES AVE
&&
EVENT NUMBER CTP1701213
PAHSpecial Weather Statement
National Weather Service State College PA
552 PM EDT FRI JUN 16 2017
PAZ019-027-050-162215-
Mifflin PA-Snyder PA-Southern Centre PA-
552 PM EDT FRI JUN 16 2017
...A STRONG THUNDERSTORM WILL AFFECT PARTS OF MIFFLIN...SNYDER...AND
SOUTHERN CENTRE COUNTIES UNTIL 615 PM EDT...
At 551 PM EDT, Doppler radar indicated a strong thunderstorm over
Seven Mountains and Milroy, moving east at 30 mph.
Torrential rainfall is occurring and Wind gusts up to 50 mph are
possible as well.
Locations impacted include...
Potters Mills, Belltown, Beaver Springs, Alfarata, Snyder-Middleswart
State Park, Milroy, Seven Mountains, McClure, Poe Valley State Park,
Reeds Gap State Park, Troxelville, Spring Mills, Reedsville, Wagner,
Siglerville and Beavertown.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Torrential rainfall is also occurring with this storm, and may lead
to localized minor flooding. Do not drive your vehicle through
flooded roadways.
&&
LAT...LON 4070 7770 4072 7768 4073 7768 4072 7771
4073 7772 4072 7777 4085 7757 4082 7735
4081 7735 4082 7732 4079 7708 4063 7747
TIME...MOT...LOC 2151Z 276DEG 25KT 4075 7758
DangeloPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE STATE COLLEGE PA
617 PM EDT FRI JUN 16 2017
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0515 PM FLASH FLOOD ZION 40.92N 77.67W
06/16/2017 CENTRE PA LAW ENFORCEMENT
ZION BACK ROAD UNDERWATER IN WALKER TOWNSHIP
&&
EVENT NUMBER CTP1701214
PAHThe State College radar (KCCX), 15 km away, was scanning. The volume nearest the first event began at 22:21 UTC.
1 thunderstorm wind. Local standard time, as filed.
A severe thunderstorm producing winds estimated near 60 mph knocked down a tree across Buffalo Run Road near Stormstown.
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: 694872.