Alert archive / Pennsylvania / Flash Flood Warnings in 2026

Flash Flood Warning 1, NWS Pittsburgh, PA

February 20, 20264 counties in Pennsylvania

NWS Pittsburgh, PA issued this flash flood warning at Feb 20, 2026, 8:43 AM EST for 4 counties in Pennsylvania. It was in force for 10 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: Feb 20, 2026, 8:43 AM EST (13:43 UTC)
Expired: Feb 20, 2026, 6:43 PM EST
In force: 10 hr
Issued by: NWS Pittsburgh, PA
Area: Storm-based polygon
Flood severity: Minor

Counties Armstrong County, PA, Butler County, PA, Clarion County, PA, Venango County, PA

The radar

The Pittsburgh radar (KPBZ), 78 km from the middle of the area, began a volume at 13:46 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 12:00Z, 1.7 hours before the alert went out and 84 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 866 m above ground
0-6 km bulk shear: 92 kt
0-1 km storm-relative helicity: 279 m²/s²
0-3 km storm-relative helicity: 314 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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 Feb 20, 7:52 AM EST, 51 minutes earlier.

Area forecast discussion, Feb 20, 7:52 AM EST, 51 minutes before

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Hazardous weather outlook, Feb 20, 7:48 AM EST, 55 minutes before

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</head>
<body>
  <main class="wrap">
    <section class="card" role="status" aria-live="polite">
      <div class="status" id="status">Temporary Notice</div>
      <h1 id="headline">This service is currently unavailable.</h1>
      <p id="message1">
        The site you requested is temporarily down for maintenance or an unexpected outage.
      </p>
      <p id="message2">
        Please try again in a few minutes.
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        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
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The office that day

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

Issued	Product	Office	Counties	Lasted
Feb 20, 11:31 AM EST	Winter Storm Watch	PBZ	Fayette, Westmoreland	24 hr
Feb 20, 1:53 PM EST	River Flood Advisory	PBZ	Allegheny	29 hr
Feb 20, 2:29 PM EST	Flash Flood Warning	PBZ	Armstrong, Clarion	3 hr
Feb 20, 6:43 PM EST	Areal Flood Warning	PBZ	Armstrong, Butler, Clarion, Venango	5 hr
Feb 20, 7:12 AM EST	Wind Advisory	PBZ	Tucker	17 hr

Nearby

Flash Flood Warnings in Pennsylvania, 2026 Every 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.