A moist airmass brought a round of intense convection that lead to flash flooding across portions of southern Pennsylvania June 1st and 2nd.
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 moist airmass brought a round of intense convection that lead to flash flooding across portions of southern Pennsylvania June 1st and 2nd.
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 1, 3:21 PM EST, 3 hours 9 minutes earlier.
Area Forecast Discussion National Weather Service State College PA 421 PM EDT Fri Jun 1 2018 .SYNOPSIS... A slow moving cold front over the Great Lakes will push southeast across Pennsylvania late today and tonight. The upper trough linked to the cold front will become detached from the jet stream as a cut off low over the Mid Atlantic region Sunday. The upper low will lift out next week ahead of an anomalous upper trough building over the northeast conus. && .NEAR TERM /UNTIL 6 AM SATURDAY MORNING/... Weak mid level capping inversion has been successful in inhibiting initiation thus far this afternoon. CAMs show most realistic development taking place along lake breeze front from Lake Erie which is just now developing as per GOES-16 vis and radar imagery. Still dealing with rich subtropical moisture throughout the area, as has been the case since Wednesday. Still expect diurnal heating of high PW air mass to generate moderate CAPEs over the NW and parts of the south. Convective evolution should be close to Thu afternoon. CAMs weaken the lake breeze line as it reaches into my CWA while any other diurnally driven convection weakens into a larger area of light to moderate showers after dark as it crosses central PA this evening. Weak 0-6km shear indicates convection will be pulse-type, with little chance of organized severe weather. Given high PW, can't rule out isolated rainfall amounts of 2+ inches, creating localized flooding issues. Still in MRGL outlook for excessive rain from WPC, with SLGT risk limited to south of Mason Dixon line. Diffuse cold front pushes southeast across the region overnight, with gradually diminishing band of showers accompanying it. Weak wind shift to the north will be the other impact. Mins won't drop off all that much, ranging from the upper 50s through the upper 60s from north to south. && .SHORT TERM /6 AM SATURDAY MORNING THROUGH 6 PM SATURDAY/... Northern and central PA should enjoy drier conditions on Saturday as the northerly flow shunts instability and high deep layer moisture to the south. Models track a wave along stalled boundary south of the Mason Dixon Line...brushing the south with low chance POPs and cloudy skies. Expect at least partial clearing central and north. highs will generally be in the mid to upper 70s..except low 70s over the Alleghenies. && .LONG TERM /SATURDAY NIGHT THROUGH FRIDAY/... Model and ensemble guidance offer a reasonably similar large scale pattern evolution over the Mid Atlantic region this period. A cut off upper low over the Mid Atlantic on Sunday will be absorbed by an anomalous upper level trough building into the northeast conus the first half of next week. Under this pattern, confidence is better than average in weather conditions staying "unsettled" with repeated/daily rain chances through early next week. Drier conditions appear likely by Wednesday, as the upper trough axis passes east of Pa. Temperatures will trend relatively cool, with the upper level trough influence holding readings near to below average for early June. However, a moderating trend is likely by late next week, as upper trough begins to lift out. && .AVIATION /21Z FRIDAY THROUGH WEDNESDAY/... Scattered to numerous showers/thunderstorms expected to pop up this afternoon and bring areas of restrictions. Short window of VFR conditions will give way to MVFR cigs in sct SHRA/TSRA. Convection will be rather disorganized until a lake breeze front pushes through late in the day into the evening - producing a more solid line of storms tracking SE from NY state. These will gradually weaken as they drop south of I-80 this evening. Lower ceilings then work in again tonight in NW/N flow. .Outlook... Sat...AM low cigs possible Laurel Highlands and N Mtns. Sun...AM low cigs possible, mainly KJST. Mon...Patchy AM fog, then ceiling restrictions likely. Tue...Patchy AM fog. && .CTP WATCHES/WARNINGS/ADVISORIES... None. && SYNOPSIS...DeVoir/Fitzgerald NEAR TERM...DeVoir/Fitzgerald SHORT TERM...DeVoir/Fitzgerald LONG TERM...Fitzgerald/Gartner AVIATION...DeVoir/RXR
Hazardous Weather Outlook National Weather Service State College PA 542 AM EDT Fri Jun 1 2018 PAZ004>006-010>012-017>019-024>028-033>037-041-042-045-046-049>053- 056>059-063>066-020945- 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- 542 AM EDT Fri Jun 1 2018 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. The probability for widespread hazardous weather is low. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time.
Special Weather Statement
National Weather Service State College PA
641 PM EDT FRI JUN 1 2018
PAZ027-012315-
Mifflin PA-
641 PM EDT FRI JUN 1 2018
...HEAVY RAIN NEAR BELLEVILLE...
At 638 PM EDT, Doppler radar indicated a strong thunderstorm between
Belleville and Allensville. The storm is nearly stationary. Nearly
two inches of rain has already fallen and very heavy rain is
expected to continue through 7 PM EDT.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Minor flooding may develop. Do not drive into water covering the
roadway.
&&
LAT...LON 4052 7783 4055 7784 4058 7783 4061 7779
4062 7777 4065 7773 4060 7769 4048 7780
TIME...MOT...LOC 2238Z 317DEG 49KT 4054 7774
DangeloSpecial Weather Statement
National Weather Service State College PA
648 PM EDT FRI JUN 1 2018
PAZ035-036-012330-
Fulton PA-Franklin PA-
648 PM EDT FRI JUN 1 2018
...HEAVY RAIN OVER MCCONNELSBURG AAND FORT LOUDON...
At 643 PM EDT, Doppler radar indicated a strong thunderstorm over
Fort Loudon, moving only very slowly to the south. This storm is
producing very heavy rainfall along route 30 between Chambersburg
and McConnellsburg.
Up to an inch and a half of rain has fallen over parts of Fulton
County already, and the heavy rain is expected to continue through
at least 715 PM EDT.
Locations impacted include... Saluvia, St. Thomas, Mercersburg,
Needmore, Harrisonville, Fort Littleton, Big Cove Tannery, Marion,
Sideling Hill Rest Area, Fort Loudon, McConnellsburg and Williamson.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Minor flooding may develop. Do not drive into water covering the
roadway.
&&
LAT...LON 4012 7810 4006 7787 3997 7775 3982 7763
3984 7819
TIME...MOT...LOC 2243Z 317DEG 48KT 3990 7791
DangeloThe State College radar (KCCX), 110 km away, was scanning. The volume nearest the first event began at 23:29 UTC.
13 flash flood. Local standard time, as filed.
Reservoir Road at Cloverleaf Court was flooded and impassable.
Great Cove Creek was out of its banks and flowing over a bridge on Confederate Road.
Flash flooding from intense heavy rain /over 2 inches in less than an hour/ was reported on Davidsburg Road between Adimire and Jayne Lane Road.
Flash flooding from brief heavy rain flooded Freyesville Road between Arnold Lane and Valley Acres Road.
Flash flooding from brief heavy rainfall along Route 74 near the intersection with Emig Mill Road.
Flash Flooding resulted in numerous impassable roads along and near Willow Street.
Heavy rainfall brought flash flooding along the West Branch of the Little Conestoga Creek over Charlestown Road. A water rescue was reported.
Heavy rainfall resulted in Little Conestoga Creek over its banks on Blue Rock Road. Three persons were trapped in their residence and resulted in a water rescue.
Heavy rainfall resulted in numerous roads becoming impassable throughout Millersville.
Heavy rainfall brought flooding on East Prospect and Witmer Roads.
Heavy rainfall brought two to three feet of water over North Sherman Street Extension at Jerusalem Road.
Car was stranded in flood water north of Yorkshire.
Kreutz Creek was over the road and impassable.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Pennsylvania in 2018Every state in 2018This day in weather historyWarnings in Pennsylvania, June 2018
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: 757233, 757236, 757244, 757247, 757248, 757249, 757251, 757253, 757254, 757255, 757256, 757259, 757261.