Showers and thunderstorms along a slow-moving frontal boundary created some minor flooding issues in Fayette County.
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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.
Showers and thunderstorms along a slow-moving frontal boundary created some minor flooding issues in Fayette County.
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 Aug 18, 4:05 PM EST, 10 minutes earlier.
Area Forecast Discussion...UPDATED National Weather Service Pittsburgh PA 505 PM EDT Sat Aug 18 2018 .SYNOPSIS... Isolated showers and a few storms mainly south of the Pennsylvania border will diminish by the evening followed by dry and more comfortable conditions Sunday with building high pressure. && .NEAR TERM /UNTIL 6 AM SUNDAY MORNING/... A couple rapid updates were issued to adjust POPs and WX based on the latest radar trends. Convective activity will exit south over the course of the evening and clouds will begin to clear out. Model soundings show low stratus/fog will be possible before dawn mainly south and east of Pittsburgh. MRi values look to favor stratus over fog at this time. && .SHORT TERM /6 AM SUNDAY MORNING THROUGH TUESDAY/... Expect dry and less humid conditions Sunday and Monday under a cooler NE flow and weak surface high pressure...before the next system begins to impact the region and a warm front lifts north over the area Tuesday morning and cold front crosses later Tuesday night. Likely POPs were maintained for Tuesday and slight to low chance POPs were included for Wednesday until the trough exits E. Near to above average temperatures should fall to below average readings by midweek. && .LONG TERM /TUESDAY NIGHT THROUGH SATURDAY/... High pressure will be the dominant feature though the extended with dry conditions and temperatures recovering back to normal by the weekend. && .AVIATION /21Z SATURDAY THROUGH THURSDAY/... An advancing cold front is located from near CDI to 2G9, with weakly-organized convection along and swd from the boundary. To the north of the cold front, steeper low-level lapse rates have supported sct stratocu development which will weaken late this afternoon as subsidence/drying ensue. Model guidance supports some vsby/cig restrictions at MGW and LBE where the frontal boundary lags and best low level moisture remains. Elsewhere, restrictions are dependent on the amount of fog development. Opted to hit the sites hardest that climatologically have problems in the morning hours in mid August. Expect VFR to then prevail under building surface ridge after fog burn-off tomorrow. Outlook... VFR will continue for much of Monday before shower/thunderstorm and potential restrictions return with both a warm front and cold frontal passage through midweek. && .PBZ WATCHES/WARNINGS/ADVISORIES... MD...None. OH...None. PA...None. WV...None. && Update...Kramar
Hazardous Weather Outlook National Weather Service Pittsburgh PA 436 AM EDT Sat Aug 18 2018 MDZ001-OHZ039>041-048>050-057>059-068-069-PAZ007>009-013>016-020>023- 029-031-073>076-WVZ001>004-012-021-509>514-190845- 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- 436 AM EDT Sat Aug 18 2018 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...Today and Tonight. No hazardous weather is expected at this time. .DAYS TWO THROUGH SEVEN...Sunday through Friday. No hazardous weather is expected at this time. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time.
The national radar mosaic for the moment the first event began.
2 flood. Local standard time, as filed.
A trained spotter reported that Willow Drive was flooded.
A trained spotter reported that Nell Street in Hopwood was flooded.
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, August 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: 780013, 780015.