Alert archive / Ohio / Heat Advisories in 2021

Heat Advisory 1, NWS Pittsburgh, PA

August 12, 20219 counties in Pennsylvania; 7 counties in West Virginia; 11 counties in Ohio

NWS Pittsburgh, PA issued this heat advisory at Aug 12, 2021, 3:15 AM EDT for 9 counties in Pennsylvania; 7 counties in West Virginia; 11 counties in Ohio. It took effect at Aug 12, 2021, 12:00 PM EDT. It was in force for 7 hr.

The area

The counties it named.

The facts

Issued: Aug 12, 2021, 3:15 AM EDT (07:15 UTC)
In effect from: Aug 12, 2021, 12:00 PM EDT
Expired: Aug 12, 2021, 7:11 PM EDT
In force: 7 hr
Issued by: NWS Pittsburgh, PA

All 27 counties

Belmont County, OH, Carroll County, OH, Columbiana County, OH, Coshocton County, OH, Guernsey County, OH, Harrison County, OH, Jefferson County, OH, Monroe County, OH, Muskingum County, OH, Noble County, OH, Tuscarawas County, OH, Allegheny County, PA, Armstrong County, PA, Beaver County, PA, Butler County, PA, Fayette County, PA, Greene County, PA, Lawrence County, PA, Washington County, PA, Westmoreland County, PA, Brooke County, WV, Hancock County, WV, Marion County, WV, Marshall County, WV, Monongalia County, WV, Ohio County, WV, Wetzel County, WV

The radar

The Pittsburgh radar (KPBZ), 49 km from the middle of the area, began a volume at 07:18 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, 7.3 hours before the alert went out and 50 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: 1042 J/kg
Mixed-layer CIN: -84 J/kg
Mixed-layer LCL: 1202 m above ground
0-6 km bulk shear: 16 kt
0-1 km storm-relative helicity: 139 m²/s²
0-3 km storm-relative helicity: 141 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 3.5

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this heat advisory 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 heat advisory went out at Aug 12, 2:04 AM EDT, 1 hour 11 minutes earlier.

Area forecast discussion, Aug 12, 2:04 AM EDT, 1 hour 11 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 11, 7:54 PM EDT, 7 hours 21 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>

In the hours before

Local storm report, Aug 11, 10:39 PM EDT, 4 hours 36 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 11, 10:45 PM EDT, 4 hours 30 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>

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 12, 11:19 AM EDT	Special Weather Statement	PBZ	Mercer	41 min
Aug 12, 11:33 AM EDT	Severe Thunderstorm Warning	PBZ	Lawrence, Mercer, Venango	27 min
Aug 12, 11:49 AM EDT	Special Weather Statement	PBZ	Lawrence	26 min
Aug 12, 11:59 AM EDT	Severe Thunderstorm Warning	PBZ	Beaver, Butler, Lawrence	31 min
Aug 12, 12:16 PM EDT	Special Weather Statement	PBZ	Beaver	29 min
Aug 12, 12:21 PM EDT	Severe Thunderstorm Warning	PBZ	Allegheny, Armstrong, Beaver, Butler, Clarion, Lawrence and 1 more	39 min
Aug 12, 12:34 PM EDT	Severe Thunderstorm Warning	PBZ	Allegheny, Beaver, Butler, Westmoreland	41 min
Aug 12, 12:56 PM EDT	Severe Thunderstorm Warning	PBZ	Allegheny, Armstrong, Butler, Indiana, Westmoreland	49 min
Aug 12, 1:05 PM EDT	Severe Thunderstorm Warning	PBZ	Armstrong, Clarion, Indiana, Jefferson	25 min
Aug 12, 1:26 PM EDT	Severe Thunderstorm Warning	PBZ	Armstrong, Indiana, Jefferson	49 min
Aug 12, 4:16 PM EDT	Special Weather Statement	PBZ	Clarion, Venango	29 min
Aug 12, 4:46 PM EDT	Severe Thunderstorm Warning	PBZ	Clarion, Venango	44 min
Aug 12, 4:52 PM EDT	Special Weather Statement	PBZ	Mercer	23 min
Aug 12, 4:56 PM EDT	Severe Thunderstorm Warning	PBZ	Forest, Venango	35 min
Aug 12, 5:03 PM EDT	Severe Thunderstorm Warning	PBZ	Butler, Lawrence, Mercer, Venango	42 min
Aug 12, 5:20 PM EDT	Severe Thunderstorm Warning	PBZ	Clarion, Jefferson	40 min
Aug 12, 5:43 PM EDT	Flash Flood Warning	PBZ	Butler, Lawrence, Mercer, Venango	3 hr
Aug 12, 5:43 PM EDT	Severe Thunderstorm Warning	PBZ	Butler, Lawrence	47 min
Aug 12, 5:53 PM EDT	Severe Thunderstorm Warning	PBZ	Allegheny, Butler	52 min
Aug 12, 6:06 PM EDT	Severe Thunderstorm Warning	PBZ	Allegheny, Beaver, Washington	24 min
Aug 12, 6:10 PM EDT	Severe Thunderstorm Warning	PBZ	Armstrong, Butler, Clarion, Forest, Jefferson, Venango	50 min
Aug 12, 6:13 PM EDT	Flash Flood Warning	PBZ	Armstrong, Butler, Clarion, Forest, Jefferson, Venango	3 hr
Aug 12, 6:33 PM EDT	Severe Thunderstorm Warning	PBZ	Allegheny, Washington	42 min
Aug 12, 6:38 PM EDT	Severe Thunderstorm Warning	PBZ	Allegheny, Armstrong, Butler, Clarion, Indiana, Jefferson and 1 more	67 min
Aug 12, 6:40 PM EDT	Severe Thunderstorm Warning	PBZ	Washington	20 min
Aug 12, 6:53 PM EDT	Severe Thunderstorm Warning	PBZ	Clarion, Forest, Jefferson	37 min
Aug 12, 7:09 PM EDT	Severe Thunderstorm Warning	PBZ	Allegheny, Armstrong, Fayette, Indiana, Washington, Westmoreland	81 min
Aug 12, 7:31 PM EDT	Flash Flood Warning	PBZ	Allegheny, Washington, Westmoreland	3 hr
Aug 12, 7:43 PM EDT	Severe Thunderstorm Warning	PBZ	Indiana	34 min
Aug 12, 7:53 PM EDT	Severe Thunderstorm Warning	PBZ	Allegheny, Washington	37 min
Aug 12, 6:45 PM EDT	Special Weather Statement	PBZ	Muskingum	30 min
Aug 12, 6:58 PM EDT	Severe Thunderstorm Warning	PBZ	Coshocton, Guernsey, Muskingum	47 min
Aug 12, 7:46 PM EDT	Severe Thunderstorm Warning	PBZ	Belmont, Guernsey, Harrison, Tuscarawas	59 min

Nearby

Heat Advisories in Ohio, 2021 Heat Advisories in Pennsylvania, 2021 Heat Advisories in West Virginia, 2021 Every heat advisory in 2021

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.