Alert archive / Pennsylvania / Flash Flood Warnings in 2024

Flash Flood Warning 41, NWS Pittsburgh, PA

August 6, 2024Allegheny County, Beaver County, Pennsylvania

NWS Pittsburgh, PA issued this flash flood warning at Aug 6, 2024, 7:34 PM EDT for Allegheny County, Beaver County, Pennsylvania. It was in force for 82 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Aug 6, 2024, 7:34 PM EDT (23:34 UTC)
Expired: Aug 6, 2024, 8:56 PM EDT
In force: 82 min
Issued by: NWS Pittsburgh, PA
Area: Storm-based polygon
Flood severity: None

Counties Allegheny County, PA, Beaver County, PA

The radar

The Pittsburgh radar (KPBZ), 7 km from the middle of the area, began a volume at 23:33 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, 11.6 hours before the alert went out and 19 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: 1038 J/kg
Mixed-layer CIN: -25 J/kg
Mixed-layer LCL: 821 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: 48 m²/s²
0-3 km storm-relative helicity: 80 m²/s²
Significant tornado parameter: 0.4
Supercell composite: 2.2

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 Aug 6, 7:12 PM EDT, 22 minutes earlier.

Area forecast discussion, Aug 6, 7:12 PM EDT, 22 minutes before

<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Service Notice</title>
  <link rel="stylesheet" href="index.css">
</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.
      </p>
      <p class="small" id="detail">
        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
      </p>
    </section>
  </main>
  <script src="index.js"></script>
</body>
</html>

Hazardous weather outlook, Aug 6, 12:02 PM EDT, 7 hours 32 minutes before

Hazardous Weather Outlook
National Weather Service Pittsburgh PA
1202 PM EDT Tue Aug 6 2024

OHZ039>041-048>050-058-059-PAZ007>009-013>016-020>022-029-031-
073>078-WVZ001>004-071615-
Tuscarawas-Carroll-Columbiana-Coshocton-Harrison-Jefferson OH-
Guernsey-Belmont-Mercer-Venango-Forest-Lawrence-Butler-Clarion-
Jefferson PA-Beaver-Allegheny-Armstrong-Washington-Greene-
Westmoreland-Higher Elevations of Westmoreland-Fayette-
Higher Elevations of Fayette-Indiana-Higher Elevations of Indiana-
Hancock-Brooke-Ohio-Marshall-
1202 PM EDT Tue Aug 6 2024

...SEVERE THUNDERSTORM WATCH 605 IN EFFECT UNTIL 7 PM EDT THIS
EVENING...

This Hazardous Weather Outlook is for east central Ohio, western
Pennsylvania, and northern West Virginia.

.DAY ONE...This afternoon and tonight.

Please listen to NOAA Weather Radio or go to weather.gov on the
Internet for more information about the following hazards.

   Severe Thunderstorm Watch.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday.

No hazardous weather is expected at this time.

.SPOTTER INFORMATION STATEMENT...

Weather spotters are encouraged to report significant weather
conditions according to Standard Operating Procedures.

OHZ057-068-069-WVZ012-021-509>514-071615-
Muskingum-Noble-Monroe-Wetzel-Marion-Monongalia-
Ridges of Eastern Monongalia and Northwestern Preston-Preston-
Eastern Preston-Western Tucker-Eastern Tucker-
1202 PM EDT Tue Aug 6 2024

This Hazardous Weather Outlook is for east central Ohio and
northern West Virginia.

.DAY ONE...This afternoon and tonight.

There is a Marginal Risk (or level 1 out of 5) for severe
thunderstorms this afternoon and evening. The main hazard is expected
to be damaging wind.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday.

No hazardous weather is expected at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

In the hours before

Local storm report, Aug 6, 7:07 PM EDT, 27 minutes before

<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Service Notice</title>
  <link rel="stylesheet" href="index.css">
</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.
      </p>
      <p class="small" id="detail">
        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
      </p>
    </section>
  </main>
  <script src="index.js"></script>
</body>
</html>

Local storm report, Aug 6, 7:09 PM EDT, 25 minutes before

<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Service Notice</title>
  <link rel="stylesheet" href="index.css">
</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.
      </p>
      <p class="small" id="detail">
        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
      </p>
    </section>
  </main>
  <script src="index.js"></script>
</body>
</html>

Special weather statement, Aug 6, 7:24 PM EDT, 10 minutes before

<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Service Notice</title>
  <link rel="stylesheet" href="index.css">
</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.
      </p>
      <p class="small" id="detail">
        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
      </p>
    </section>
  </main>
  <script src="index.js"></script>
</body>
</html>

Local storm report, Aug 6, 7:29 PM EDT, 5 minutes before

<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Service Notice</title>
  <link rel="stylesheet" href="index.css">
</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.
      </p>
      <p class="small" id="detail">
        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
      </p>
    </section>
  </main>
  <script src="index.js"></script>
</body>
</html>

Special weather statement, Aug 6, 7:30 PM EDT, 4 minutes before

<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Service Notice</title>
  <link rel="stylesheet" href="index.css">
</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.
      </p>
      <p class="small" id="detail">
        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
      </p>
    </section>
  </main>
  <script src="index.js"></script>
</body>
</html>

Local storm report, Aug 6, 7:33 PM EDT, 1 minute before

<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Service Notice</title>
  <link rel="stylesheet" href="index.css">
</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.
      </p>
      <p class="small" id="detail">
        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
      </p>
    </section>
  </main>
  <script src="index.js"></script>
</body>
</html>

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 6, 10:48 AM EDT	Severe Thunderstorm Warning	PBZ	Mercer	42 min
Aug 6, 11:10 AM EDT	Special Weather Statement	PBZ	Venango	50 min
Aug 6, 11:13 AM EDT	Severe Thunderstorm Warning	PBZ	Butler, Lawrence, Mercer, Venango	47 min
Aug 6, 11:55 AM EDT	Areal Flood Advisory	PBZ	Mercer	3 hr
Aug 6, 11:59 AM EDT	Severe Thunderstorm Warning	PBZ	Butler, Mercer, Venango	31 min
Aug 6, 12:04 PM EDT	Special Weather Statement	PBZ	Venango	26 min
Aug 6, 12:12 PM EDT	Special Weather Statement	PBZ	Lawrence	33 min
Aug 6, 12:16 PM EDT	Severe Thunderstorm Warning	PBZ	Clarion, Forest, Venango	29 min
Aug 6, 12:18 PM EDT	Severe Thunderstorm Warning	PBZ	Armstrong, Butler, Clarion, Venango	42 min
Aug 6, 12:20 PM EDT	Areal Flood Advisory	PBZ	Venango	3 hr
Aug 6, 12:30 PM EDT	Severe Thunderstorm Warning	PBZ	Butler, Lawrence, Mercer, Venango	45 min
Aug 6, 12:42 PM EDT	Severe Thunderstorm Warning	PBZ	Clarion, Forest, Jefferson, Venango	33 min
Aug 6, 12:52 PM EDT	Severe Thunderstorm Warning Considerable damage threat	PBZ	Armstrong, Clarion, Indiana, Jefferson	53 min
Aug 6, 1:11 PM EDT	Severe Thunderstorm Warning	PBZ	Clarion, Forest, Jefferson	19 min
Aug 6, 1:12 PM EDT	Severe Thunderstorm Warning	PBZ	Butler, Lawrence, Mercer	33 min
Aug 6, 1:15 PM EDT	Severe Thunderstorm Warning	PBZ	Mercer	31 min
Aug 6, 1:17 PM EDT	Severe Thunderstorm Warning	PBZ	Lawrence, Mercer	28 min
Aug 6, 1:36 PM EDT	Severe Thunderstorm Warning	PBZ	Mercer, Venango	24 min
Aug 6, 1:37 PM EDT	Severe Thunderstorm Warning	PBZ	Armstrong, Indiana, Jefferson	53 min
Aug 6, 1:40 PM EDT	Severe Thunderstorm Warning	PBZ	Beaver, Butler, Lawrence	35 min
Aug 6, 1:45 PM EDT	Severe Thunderstorm Warning	PBZ	Lawrence, Mercer	26 min
Aug 6, 1:51 PM EDT	Tornado Warning	PBZ	Mercer, Venango	24 min
Aug 6, 1:54 PM EDT	Special Weather Statement	PBZ	Beaver	36 min
Aug 6, 2:00 PM EDT	Flash Flood Warning	PBZ	Butler, Lawrence, Mercer	3 hr
Aug 6, 2:00 PM EDT	Severe Thunderstorm Warning	PBZ	Armstrong, Butler, Clarion, Forest, Mercer, Venango	45 min
Aug 6, 2:13 PM EDT	Severe Thunderstorm Warning	PBZ	Beaver, Butler, Lawrence	32 min
Aug 6, 2:14 PM EDT	Severe Thunderstorm Warning	PBZ	Armstrong, Indiana	31 min
Aug 6, 2:27 PM EDT	Severe Thunderstorm Warning	PBZ	Indiana, Jefferson	18 min
Aug 6, 2:37 PM EDT	Flash Flood Warning	PBZ	Armstrong, Indiana, Jefferson	3 hr
Aug 6, 2:39 PM EDT	Severe Thunderstorm Warning	PBZ	Armstrong, Indiana	51 min
Aug 6, 2:41 PM EDT	Severe Thunderstorm Warning	PBZ	Beaver	34 min
Aug 6, 2:49 PM EDT	Severe Thunderstorm Warning	PBZ	Allegheny, Armstrong, Beaver, Butler, Westmoreland	41 min
Aug 6, 2:55 PM EDT	Severe Thunderstorm Warning	PBZ	Allegheny, Armstrong, Indiana, Westmoreland	35 min
Aug 6, 3:06 PM EDT	Areal Flood Advisory	PBZ	Butler	97 min
Aug 6, 3:16 PM EDT	Special Weather Statement	PBZ	Beaver	29 min
Aug 6, 3:19 PM EDT	Flash Flood Warning	PBZ	Allegheny, Armstrong, Beaver, Butler, Westmoreland	6 hr
Aug 6, 3:29 PM EDT	Severe Thunderstorm Warning	PBZ	Armstrong, Indiana, Westmoreland	20 min
Aug 6, 3:39 PM EDT	Flash Flood Warning	PBZ	Indiana	2 hr
Aug 6, 4:41 PM EDT	Areal Flood Advisory	PBZ	Allegheny, Westmoreland	88 min
Aug 6, 5:09 PM EDT	Severe Thunderstorm Warning	PBZ	Mercer	36 min
Aug 6, 5:21 PM EDT	Tornado Warning	PBZ	Mercer	24 min
Aug 6, 5:26 PM EDT	Severe Thunderstorm Warning	PBZ	Beaver, Lawrence, Mercer	49 min
Aug 6, 5:39 PM EDT	Tornado Warning	PBZ	Mercer	9 min
Aug 6, 5:48 PM EDT	Severe Thunderstorm Warning	PBZ	Armstrong, Butler, Clarion, Lawrence, Mercer, Venango	42 min
Aug 6, 5:54 PM EDT	Severe Thunderstorm Warning	PBZ	Allegheny, Beaver	51 min
Aug 6, 5:59 PM EDT	Severe Thunderstorm Warning	PBZ	Armstrong, Beaver, Butler, Clarion, Lawrence, Mercer	46 min
Aug 6, 6:14 PM EDT	Severe Thunderstorm Warning	PBZ	Allegheny, Beaver, Butler	46 min
Aug 6, 6:29 PM EDT	Severe Thunderstorm Warning Considerable damage threat	PBZ	Armstrong, Butler, Clarion, Forest, Jefferson, Mercer and 1 more	61 min
Aug 6, 6:39 PM EDT	Severe Thunderstorm Warning	PBZ	Allegheny, Armstrong, Butler, Clarion, Indiana, Jefferson and 2 more	66 min
Aug 6, 7:06 PM EDT	Severe Thunderstorm Warning	PBZ	Allegheny, Fayette, Washington, Westmoreland	39 min
Aug 6, 7:24 PM EDT	Special Weather Statement	PBZ	Indiana	36 min
Aug 6, 7:30 PM EDT	Special Weather Statement	PBZ	Clarion	30 min
Aug 6, 7:42 PM EDT	Severe Thunderstorm Warning	PBZ	Allegheny, Fayette, Indiana, Washington, Westmoreland	48 min

Nearby

Flash Flood Warnings in Pennsylvania, 2024 Every flash flood warning in 2024

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.