Alert archive / Pennsylvania / Flash Flood Warnings in 2026
Flash Flood Warning 10, NWS Pittsburgh, PA
NWS Pittsburgh, PA issued this flash flood warning at May 24, 2026, 8:59 PM EDT for Allegheny County, Butler County, Pennsylvania. It was in force for 2 hr. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- May 24, 2026, 8:59 PM EDT (00:59 UTC)
- Expired
- May 24, 2026, 11:21 PM EDT
- In force
- 2 hr
- Issued by
- NWS Pittsburgh, PA
- Area
- Storm-based polygon
- Flood severity
- None
Counties Allegheny County, PA, Butler County, PA
The radar
The Pittsburgh radar (KPBZ), 29 km from the middle of the area, began a volume at 00:58 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
The nearest sounding before it
Pittsburgh, PA (KPIT), launched 00:00Z, 1.0 hours before the alert went out and 34 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 112 J/kg
- Mixed-layer CIN
- -8 J/kg
- Mixed-layer LCL
- 688 m above ground
- 0-6 km bulk shear
- 37 kt
- 0-1 km storm-relative helicity
- 89 m²/s²
- 0-3 km storm-relative helicity
- 200 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.2
What forecasters said that day
The local office's own words before this flash flood warning went out, 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 this flash flood warning went out at May 24, 7:47 PM EDT, 1 hour 12 minutes earlier.
Area forecast discussion, May 24, 7:47 PM EDT, 1 hour 12 minutes before
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Hazardous Weather Outlook National Weather Service Pittsburgh PA 524 PM EDT Sun May 24 2026 OHZ039>041-048-PAZ013-252130- Tuscarawas-Carroll-Columbiana-Coshocton-Lawrence- 524 PM EDT Sun May 24 2026 This Hazardous Weather Outlook is for east central Ohio and southwest Pennsylvania. .DAY ONE...Tonight. Showers and a few thunderstorms are expected this afternoon into tonight, with locally heavy rainfall possible. With the ground saturated in some locations due to the recent rainfall and renewed higher rain rates, localized flooding will be possible especially in areas that see multiple rounds of heavy rain. .DAYS TWO THROUGH SEVEN...Monday through Saturday. The probability for widespread hazardous weather is low. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time. PAZ007>009-015-016-WVZ512>514-252130- Mercer-Venango-Forest-Clarion-Jefferson PA-Eastern Preston- Western Tucker-Eastern Tucker- 524 PM EDT Sun May 24 2026 This Hazardous Weather Outlook is for northwest Pennsylvania, western Pennsylvania and northern West Virginia. .DAY ONE...Tonight. No hazardous weather is expected at this time. .DAYS TWO THROUGH SEVEN...Monday through Saturday. The probability for widespread hazardous weather is low. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time. OHZ049-050-057>059-068-069-PAZ014-020>022-029-031-073>078-WVZ001>004- 012-021-509>511-252130- Harrison-Jefferson OH-Muskingum-Guernsey-Belmont-Noble-Monroe-Butler- Beaver-Allegheny-Armstrong-Washington-Greene-Westmoreland- Higher Elevations of Westmoreland-Fayette- Higher Elevations of Fayette-Indiana-Higher Elevations of Indiana- Hancock-Brooke-Ohio-Marshall-Wetzel-Marion-Monongalia- Ridges of Eastern Monongalia and Northwestern Preston-Preston- 524 PM EDT Sun May 24 2026 ...FLOOD WATCH IN EFFECT UNTIL 2 AM EDT MONDAY... This Hazardous Weather Outlook is for east central Ohio, southwest Pennsylvania, western Pennsylvania, and northern West Virginia. .DAY ONE...Tonight. Please listen to NOAA Weather Radio or go to weather.gov on the Internet for more information about the following hazards. Flood Watch. Showers and a few thunderstorms are expected this afternoon into tonight, with locally heavy rainfall possible. With the ground saturated in some locations due to the recent rainfall and renewed higher rain rates, localized flooding will be possible especially in areas that see multiple rounds of heavy rain. .DAYS TWO THROUGH SEVEN...Monday through Saturday. The probability for widespread hazardous weather is low. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time. Kramar
In the hours before
Local storm report, May 24, 7:19 PM EDT, 1 hour 40 minutes before
Preliminary Local Storm Report
National Weather Service Pittsburgh PA
719 PM EDT Sun May 24 2026
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0718 PM Flash Flood 4 E Roseville 39.81N 82.00W
05/24/2026 Muskingum OH Public
Neighborhood at Columbus St and N Main St
underwater from flooding. Photos provided by
media.
&&
KramarLocal storm report, May 24, 7:28 PM EDT, 1 hour 31 minutes before
Preliminary Local Storm Report
National Weather Service Pittsburgh PA
728 PM EDT Sun May 24 2026
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0700 PM Flash Flood 4 ESE Roseville 39.79N 82.00W
05/24/2026 Muskingum OH Public
Goose Run/Brush Creek overflowing banks and
causing deep water over Goosecreek Rd.
Flooding ongoing.
&&
KramarLocal storm report, May 24, 7:45 PM EDT, 1 hour 14 minutes before
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</html>The office that day
Everything else NWS Pittsburgh, PA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 25, 2:11 AM EDT | Dense Fog Advisory | PBZ | Armstrong, Beaver, Butler, Clarion, Forest, Jefferson and 3 more | 7 hr |
Nearby
Flash Flood Warnings in Pennsylvania, 2026Every flash flood warning in 2026
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.