Alert archive / Pennsylvania / Flash Flood Warnings in 2026

Flash Flood Warning 10, NWS Pittsburgh, PA

May 24, 2026Allegheny County, Butler County, Pennsylvania

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.

Skew-T log-pSkew-T log-p diagram, Pittsburgh, PA at 00:00Z on 2026-05-25Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 112 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Pittsburgh, PA at 00:00Z on 2026-05-25The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 89 square meters per square second.1939587897Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
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

Open this sounding in Storm Lab

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, May 24, 5:24 PM EDT, 3 hours 35 minutes before
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.

&&

Kramar
Local 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.

&&

Kramar
Local storm report, May 24, 7:45 PM EDT, 1 hour 14 minutes before
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The office that day

Everything else NWS Pittsburgh, PA issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 25, 2:11 AM EDTDense Fog AdvisoryPBZArmstrong, Beaver, Butler, Clarion, Forest, Jefferson and 3 more7 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.