Alert archive / Pennsylvania / Flash Flood Watches in 2015

Flash Flood Watch 4, NWS Pittsburgh, PA

July 7, 20155 counties in Pennsylvania; Belmont County, Monroe County, Noble County, Ohio; 4 counties in West Virginia

NWS Pittsburgh, PA issued this flash flood watch at Jul 7, 2015, 3:03 PM EDT for 5 counties in Pennsylvania; Belmont County, Monroe County, Noble County, Ohio; 4 counties in West Virginia. It took effect at Jul 7, 2015, 8:00 PM EDT. It was in force for 8 hr.

The area

The counties it named.

The facts

Issued: Jul 7, 2015, 3:03 PM EDT (19:03 UTC)
In effect from: Jul 7, 2015, 8:00 PM EDT
Expired: Jul 8, 2015, 3:46 AM EDT
In force: 8 hr
Issued by: NWS Pittsburgh, PA
Flood severity: None

Counties Belmont County, OH, Monroe County, OH, Noble County, OH, Allegheny County, PA, Fayette County, PA, Greene County, PA, Washington County, PA, Westmoreland County, PA, Marion County, WV, Marshall County, WV, Ohio County, WV, Wetzel County, WV

The radar

The Pittsburgh radar (KPBZ), 68 km from the middle of the area, began a volume at 19:03 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 (KAGC), launched 12:00Z, 7.1 hours before the alert went out and 59 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: 47 J/kg
Mixed-layer CIN: -32 J/kg
Mixed-layer LCL: 903 m above ground
0-6 km bulk shear: 13 kt
0-1 km storm-relative helicity: 16 m²/s²
0-3 km storm-relative helicity: 15 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 watch 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 watch went out at Jul 7, 2:59 PM EDT, 4 minutes earlier.

Area forecast discussion, Jul 7, 2:59 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>

Hazardous weather outlook, Jul 7, 3:09 AM EDT, 11 hours 54 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
Jul 7, 4:08 PM EDT	Special Weather Statement	PBZ	Forest	52 min
Jul 7, 4:23 PM EDT	Severe Thunderstorm Warning	PBZ	Clarion, Forest	37 min
Jul 7, 6:15 PM EDT	Severe Thunderstorm Warning	PBZ	Greene, Washington	45 min
Jul 7, 6:59 PM EDT	Severe Thunderstorm Warning	PBZ	Allegheny, Greene, Washington	31 min
Jul 7, 7:05 PM EDT	Severe Thunderstorm Warning	PBZ	Beaver, Lawrence	25 min
Jul 7, 7:27 PM EDT	Severe Thunderstorm Warning	PBZ	Allegheny, Beaver, Butler, Washington	33 min
Jul 7, 7:52 PM EDT	Special Weather Statement	PBZ	Westmoreland	38 min
Jul 7, 7:58 PM EDT	Severe Thunderstorm Warning	PBZ	Allegheny, Armstrong, Beaver, Butler	32 min

Nearby

Flash Flood Watches in Pennsylvania, 2015 Flash Flood Watches in West Virginia, 2015 Flash Flood Watches in Ohio, 2015 Every flash flood watch in 2015

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.