Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2019

Severe Thunderstorm Warning 265, NWS State College, PA

August 18, 2019Juniata County, Mifflin County, Pennsylvania

NWS State College, PA issued this severe thunderstorm warning at Aug 18, 2019, 5:25 PM EDT for Juniata County, Mifflin County, Pennsylvania. It was in force for 50 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 18, 2019, 5:25 PM EDT (21:25 UTC)
Expired: Aug 18, 2019, 6:15 PM EDT
In force: 50 min
Issued by: NWS State College, PA
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Juniata County, PA, Mifflin County, PA

The radar

The State College radar (KCCX), 57 km from the middle of the area, began a volume at 21:27 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

Washington/Dulle, VA (KIAD), launched 12:00Z, 9.4 hours before the alert went out and 180 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: 751 J/kg
Mixed-layer CIN: -104 J/kg
Mixed-layer LCL: 1254 m above ground
0-6 km bulk shear: 16 kt
0-1 km storm-relative helicity: 18 m²/s²
0-3 km storm-relative helicity: 13 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 severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS State College, PA wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 18, 3:32 PM EDT, 1 hour 53 minutes earlier.

Area forecast discussion, Aug 18, 3:32 PM EDT, 1 hour 53 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 18, 5:20 AM EDT, 12 hours 5 minutes before

Hazardous Weather Outlook
National Weather Service State College PA
520 AM EDT Sun Aug 18 2019

PAZ019-024>028-045-046-049>053-190930-
Southern Centre-Cambria-Blair-Huntingdon-Mifflin-Juniata-
Southern Clinton-Southern Lycoming-Union-Snyder-Montour-
Northumberland-Columbia-
520 AM EDT Sun Aug 18 2019

This Hazardous Weather Outlook is for central Pennsylvania.

.DAY ONE...Today and tonight.

Scattered to numerous late day showers and thunderstorms will
occur today. A few of the storms will become strong to severe
thunderstorms with gusty winds, locally heavy rain and frequent
lightning.

.DAYS TWO THROUGH SEVEN...Monday through Saturday.

Heat indices around 100 degrees likely both Monday and Tuesday
afternoon.

.SPOTTER INFORMATION STATEMENT...

Spotters are encouraged to report significant hazardous weather.

PAZ033>036-056>059-063>066-190930-
Somerset-Bedford-Fulton-Franklin-Perry-Dauphin-Schuylkill-Lebanon-
Cumberland-Adams-York-Lancaster-
520 AM EDT Sun Aug 18 2019

This Hazardous Weather Outlook is for central Pennsylvania.

.DAY ONE...Today and tonight.

Scattered late afternoon and early evening showers and thunderstorms
will occur today. A few of the storms will become strong to severe
thunderstorms with gusty winds, locally heavy rain and frequent
lightning.

.DAYS TWO THROUGH SEVEN...Monday through Saturday.

Heat indices around 100 degrees likely both Monday and Tuesday
afternoon.

Additional strong to locally severe thunderstorms, containing heavy
rain and gusty winds, will occur each afternoon Monday through
Wednesday.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

PAZ004>006-010>012-017-018-037-041-042-190930-
Warren-McKean-Potter-Elk-Cameron-Northern Clinton-Clearfield-
Northern Centre-Tioga-Northern Lycoming-Sullivan-
520 AM EDT Sun Aug 18 2019

This Hazardous Weather Outlook is for central Pennsylvania.

.DAY ONE...Today and tonight.

Scattered to numerous late afternoon and early evening showers and
thunderstorms will occur today. A few of the storms will become
strong to severe thunderstorms with gusty winds, locally heavy rain
and frequent lightning.

.DAYS TWO THROUGH SEVEN...Monday through Saturday.

Additional strong to locally severe thunderstorms, containing heavy
rain and gusty winds, will occur each afternoon Monday through
Wednesday.

.SPOTTER INFORMATION STATEMENT...

Spotters are encouraged to report significant hazardous weather.

In the hours before

Local storm report, Aug 18, 4:54 PM EDT, 31 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 18, 4:55 PM EDT, 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>

Local storm report, Aug 18, 5:05 PM EDT, 20 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 18, 5:05 PM EDT, 20 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 18, 5:11 PM EDT, 14 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 18, 5:21 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>

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 17, 8:35 PM EDT	Special Weather Statement	CTP	Cambria	25 min
Aug 18, 8:16 AM EDT	Special Weather Statement	CTP	Warren	44 min
Aug 18, 12:37 PM EDT	Special Weather Statement	CTP	McKean	38 min
Aug 18, 12:40 PM EDT	Special Weather Statement	CTP	Potter	50 min
Aug 18, 12:44 PM EDT	Severe Thunderstorm Warning	CTP	Cameron, Elk, McKean	76 min
Aug 18, 1:18 PM EDT	Special Weather Statement	CTP	Cameron	42 min
Aug 18, 1:36 PM EDT	Severe Thunderstorm Warning	CTP	Cameron, Clinton, Elk, Potter	54 min
Aug 18, 1:51 PM EDT	Special Weather Statement	CTP	Clearfield	39 min
Aug 18, 2:02 PM EDT	Severe Thunderstorm Warning	CTP	Cameron, Clearfield, Clinton	58 min
Aug 18, 2:09 PM EDT	Severe Thunderstorm Warning	CTP	Tioga	81 min
Aug 18, 2:28 PM EDT	Severe Thunderstorm Warning	CTP	Cameron, Clinton, Potter	62 min
Aug 18, 2:45 PM EDT	Severe Thunderstorm Warning	CTP	Centre, Clinton, Lycoming	60 min
Aug 18, 3:33 PM EDT	Special Weather Statement	CTP	Centre	12 min
Aug 18, 3:34 PM EDT	Severe Thunderstorm Warning	CTP	Centre	56 min
Aug 18, 3:36 PM EDT	Special Weather Statement	CTP	Cambria	24 min
Aug 18, 3:39 PM EDT	Special Weather Statement	CTP	Somerset	21 min
Aug 18, 3:55 PM EDT	Special Weather Statement	CTP	Clearfield	20 min
Aug 18, 3:58 PM EDT	Special Weather Statement	CTP	Lycoming, Sullivan	32 min
Aug 18, 4:18 PM EDT	Special Weather Statement	CTP	Lancaster	12 min
Aug 18, 4:29 PM EDT	Special Weather Statement	CTP	Lancaster	16 min
Aug 18, 4:33 PM EDT	Special Weather Statement	CTP	Montour, Union	27 min
Aug 18, 4:34 PM EDT	Special Weather Statement	CTP	Centre	26 min
Aug 18, 4:43 PM EDT	Special Weather Statement	CTP	Bedford	17 min
Aug 18, 4:44 PM EDT	Special Weather Statement	CTP	Columbia	16 min
Aug 18, 4:55 PM EDT	Special Weather Statement	CTP	Blair	35 min
Aug 18, 5:03 PM EDT	Areal Flood Advisory	CTP	Lancaster	117 min
Aug 18, 5:05 PM EDT	Special Weather Statement	CTP	Columbia, Montour	25 min
Aug 18, 5:06 PM EDT	Severe Thunderstorm Warning	CTP	Centre, Huntingdon, Mifflin	24 min
Aug 18, 5:21 PM EDT	Special Weather Statement	CTP	McKean	24 min
Aug 18, 5:31 PM EDT	Special Weather Statement	CTP	York	29 min
Aug 18, 5:36 PM EDT	Special Weather Statement	CTP	Schuylkill	24 min
Aug 18, 5:38 PM EDT	Special Weather Statement	CTP	Fulton	22 min
Aug 18, 5:47 PM EDT	Special Weather Statement	CTP	Schuylkill	28 min
Aug 18, 6:01 PM EDT	Severe Thunderstorm Warning	CTP	Perry	44 min
Aug 18, 6:21 PM EDT	Special Weather Statement	CTP	Schuylkill	24 min
Aug 18, 6:24 PM EDT	Special Weather Statement	CTP	Elk	21 min
Aug 18, 6:30 PM EDT	Special Weather Statement	CTP	Franklin	30 min
Aug 18, 6:30 PM EDT	Severe Thunderstorm Warning	CTP	Elk	44 min
Aug 18, 6:43 PM EDT	Special Weather Statement	CTP	Schuylkill	32 min
Aug 18, 6:45 PM EDT	Special Weather Statement	CTP	Cameron	15 min
Aug 18, 6:46 PM EDT	Areal Flood Advisory	CTP	Schuylkill	3 hr
Aug 18, 7:04 PM EDT	Special Weather Statement	CTP	Cameron	26 min
Aug 18, 7:22 PM EDT	Special Weather Statement	CTP	Lebanon	23 min
Aug 18, 7:44 PM EDT	Special Weather Statement	CTP	Lebanon	31 min
Aug 18, 7:53 PM EDT	Severe Thunderstorm Warning	CTP	Lancaster, Lebanon	55 min

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 2019 Every severe thunderstorm warning in 2019

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.