Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2019

Severe Thunderstorm Warning 210, NWS Pittsburgh, PA

July 21, 2019Armstrong County, Butler County, Pennsylvania

NWS Pittsburgh, PA issued this severe thunderstorm warning at Jul 21, 2019, 4:19 PM EDT for Armstrong County, Butler County, Pennsylvania. It was in force for 26 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: Jul 21, 2019, 4:19 PM EDT (20:19 UTC)
Expired: Jul 21, 2019, 4:45 PM EDT
In force: 26 min
Issued by: NWS Pittsburgh, PA
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Armstrong County, PA, Butler County, PA

The radar

The Pittsburgh radar (KPBZ), 58 km from the middle of the area, began a volume at 20:23 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, 8.3 hours before the alert went out and 61 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: 1836 J/kg
Mixed-layer CIN: -26 J/kg
Mixed-layer LCL: 870 m above ground
0-6 km bulk shear: 20 kt
0-1 km storm-relative helicity: 40 m²/s²
0-3 km storm-relative helicity: 72 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 Pittsburgh, PA wrote its last area forecast discussion before this severe thunderstorm warning went out at Jul 21, 3:31 PM EDT, 48 minutes earlier.

Area forecast discussion, Jul 21, 3:31 PM EDT, 48 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 21, 2:15 AM EDT, 14 hours 4 minutes before

Hazardous Weather Outlook
National Weather Service Pittsburgh PA
215 AM EDT Sun Jul 21 2019

MDZ001-OHZ039>041-048>050-057>059-068-069-PAZ007>009-013>016-020>023-
029-031-073>076-WVZ001>004-012-021-509>514-220615-
Garrett-Tuscarawas-Carroll-Columbiana-Coshocton-Harrison-
Jefferson OH-Muskingum-Guernsey-Belmont-Noble-Monroe-Mercer-Venango-
Forest-Lawrence-Butler-Clarion-Jefferson PA-Beaver-Allegheny-
Armstrong-Indiana-Washington-Greene-Westmoreland-Westmoreland Ridges-
Fayette-Fayette Ridges-Hancock-Brooke-Ohio-Marshall-Wetzel-Marion-
Monongalia-Ridges of Eastern Monongalia and Northwestern Preston-
Preston-Eastern Preston-Western Tucker-Eastern Tucker-
215 AM EDT Sun Jul 21 2019

This Hazardous Weather Outlook is for western Maryland, east
central Ohio, northwest Pennsylvania, southwest Pennsylvania, west
central Pennsylvania, western Pennsylvania, northern West Virginia
and northern panhandle of West Virginia.

.DAY ONE...Today and tonight.

Isolated severe storms are possible this afternoon and evening. The
main severe threat will be damaging wind gusts. Any storms will be
capable of producing heavy rain, increasing the threat for flooding.

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

Hazardous weather is not expected at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

In the hours before

Local storm report, Jul 21, 10:46 AM EDT, 5 hours 33 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PITTSBURGH PA
1046 AM EDT SUN JUL 21 2019

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1015 PM     TSTM WND DMG     FERTIGS                 41.35N  79.58W
07/20/2019                   VENANGO            PA   DEPT OF HIGHWAYS

            SEVERAL TREES REPORTED DOWN ON WIRES. DAVIS AND FERTIGS
            ROAD, TARKLIN AND MAPLESHADE ROAD, CAMP COFFMAN ROAD,
            PINEGROVE SCHOOL ROAD AND HALE ROAD.

&&

EVENT NUMBER PBZ1902756

AMILLER

Local storm report, Jul 21, 11:03 AM EDT, 5 hours 16 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PITTSBURGH PA
1103 AM EDT SUN JUL 21 2019

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0725 PM     TSTM WND DMG     STAHLSTOWN              40.15N  79.33W
07/20/2019                   WESTMORELAND       PA   SOCIAL MEDIA

            PHOTOS OF A VERY LARGE TREE DOWN ON BOTH A GARAGE AND
            CRUSHING A PICKUP TRUCK POSTED TO LOCAL MEDIA OUTLET
            FACEBOOK PAGE.

&&

EVENT NUMBER PBZ1902757

AMILLER

Local storm report, Jul 21, 2:25 PM EDT, 1 hour 54 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PITTSBURGH PA
225 PM EDT SUN JUL 21 2019

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0205 PM     TSTM WND DMG     IMPERIAL-ENLOW          40.45N  80.25W
07/21/2019                   ALLEGHENY          PA   NWS EMPLOYEE

            BOTH TREES AND POWER LINES DOWN OFF ELM STREET IN
            IMPERIAL

&&

EVENT NUMBER PBZ1902758

BROWN

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 20, 8:05 PM EDT	Special Weather Statement	PBZ	Venango	40 min
Jul 20, 9:51 PM EDT	Special Weather Statement	PBZ	Clarion, Venango	39 min
Jul 20, 9:56 PM EDT	Severe Thunderstorm Warning	PBZ	Clarion, Forest, Venango	49 min
Jul 20, 10:20 PM EDT	Special Weather Statement	PBZ	Clarion	25 min
Jul 20, 10:25 PM EDT	Severe Thunderstorm Warning	PBZ	Clarion, Forest, Jefferson	39 min
Jul 20, 10:50 PM EDT	Special Weather Statement	PBZ	Jefferson	25 min
Jul 21, 1:58 PM EDT	Severe Thunderstorm Warning	PBZ	Allegheny, Beaver, Washington	17 min
Jul 21, 2:17 PM EDT	Severe Thunderstorm Warning	PBZ	Allegheny	28 min
Jul 21, 6:14 PM EDT	Severe Thunderstorm Warning	PBZ	Mercer	31 min
Jul 21, 6:54 PM EDT	Severe Thunderstorm Warning	PBZ	Fayette	36 min
Jul 21, 7:29 PM EDT	Flash Flood Warning	PBZ	Fayette	3 hr

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.