Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2023

Severe Thunderstorm Warning 61, NWS State College, PA

July 9, 2023Lancaster County, Pennsylvania

NWS State College, PA issued this severe thunderstorm warning at Jul 9, 2023, 3:10 PM EDT for Lancaster County, Pennsylvania. It was in force for 20 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 9, 2023, 3:10 PM EDT (19:10 UTC)
Expired
Jul 9, 2023, 3:30 PM EDT
In force
20 min
Issued by
NWS State College, PA
Area
Storm-based polygon
Hail
1.0 in
Wind
60.0 mph

County Lancaster County, PA

The radar

The Dover AFB radar (KDOX), 152 km from the middle of the area, began a volume at 19:10 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
Jul 9, 11:06 AM EDTSevere Thunderstorm WatchSPC9 hr

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 12:00Z, 7.2 hours before the alert went out and 157 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-pSkew-T log-p diagram, Washington/Dulle, VA at 12:00Z on 2023-07-09Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 952 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Washington/Dulle, VA at 12:00Z on 2023-07-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 12 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
952 J/kg
Mixed-layer CIN
-58 J/kg
Mixed-layer LCL
686 m above ground
0-6 km bulk shear
20 kt
0-1 km storm-relative helicity
12 m²/s²
0-3 km storm-relative helicity
37 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.2

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 Jul 9, 2:52 PM EDT, 18 minutes earlier.

Area forecast discussion, Jul 9, 2:52 PM EDT, 18 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 9, 3:06 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>

In the hours before

Local storm report, Jul 9, 1:41 PM EDT, 1 hour 29 minutes before
Preliminary Local Storm Report
National Weather Service State College PA
141 PM EDT Sun Jul 9 2023

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

1202 PM     Tstm Wnd Dmg     1 NE Waynesboro         39.76N 77.57W
07/09/2023                   Franklin           PA   911 Call Center

            Tree down.

&&
Local storm report, Jul 9, 1:44 PM EDT, 1 hour 26 minutes before
Preliminary Local Storm Report
National Weather Service State College PA
144 PM EDT Sun Jul 9 2023

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

0120 PM     Flash Flood      1 NE Waynesboro         39.76N 77.57W
07/09/2023                   Franklin           PA   911 Call Center

            Ponding of water on roadways.

&&
Local storm report, Jul 9, 2:12 PM EDT, 58 minutes before
Preliminary Local Storm Report
National Weather Service State College PA
212 PM EDT Sun Jul 9 2023

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

0126 PM     Tstm Wnd Dmg     2 E Thompsontown        40.57N 77.20W
07/09/2023                   Juniata            PA   911 Call Center

            Road, City park and residential area
            flooding.

&&

ADE
Local storm report, Jul 9, 2:14 PM EDT, 56 minutes before
Preliminary Local Storm Report
National Weather Service State College PA
214 PM EDT Sun Jul 9 2023

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

0200 PM     Rain             Dover                   40.01N 76.85W
07/09/2023  E2.00 inch       York               PA   Trained Spotter

            Report from trained spotter in York, PA.

&&

ADE
Special weather statement, Jul 9, 2:48 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>
Local storm report, Jul 9, 2:56 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>

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 8, 11:21 PM EDTSpecial Weather StatementCTPSomerset24 min
Jul 8, 11:45 PM EDTSpecial Weather StatementCTPBedford30 min
Jul 9, 12:42 AM EDTSpecial Weather StatementCTPBedford48 min
Jul 9, 4:19 AM EDTSpecial Weather StatementCTPUnion41 min
Jul 9, 4:30 AM EDTSpecial Weather StatementCTPSullivan30 min
Jul 9, 5:08 AM EDTAreal Flood AdvisoryCTPColumbia, Sullivan2 hr
Jul 9, 5:13 AM EDTSpecial Weather StatementCTPSullivan62 min
Jul 9, 7:46 AM EDTSpecial Weather StatementCTPMontour44 min
Jul 9, 8:14 AM EDTSpecial Weather StatementCTPSullivan31 min
Jul 9, 8:28 AM EDTSpecial Weather StatementCTPColumbia32 min
Jul 9, 8:44 AM EDTSevere Thunderstorm WarningCTPColumbia, Montour, Northumberland61 min
Jul 9, 8:54 AM EDTAreal Flood AdvisoryCTPColumbia, Lycoming, Montour, Northumberland, Sullivan3 hr
Jul 9, 9:08 AM EDTSpecial Weather StatementCTPJuniata37 min
Jul 9, 9:22 AM EDTFlash Flood WarningCTPColumbia, Lycoming, Sullivan4 hr
Jul 9, 9:53 AM EDTSpecial Weather StatementCTPPerry52 min
Jul 9, 10:03 AM EDTSevere Thunderstorm WarningCTPJuniata, Perry57 min
Jul 9, 10:39 AM EDTSevere Thunderstorm WarningCTPDauphin, Juniata, Northumberland, Perry, Snyder51 min
Jul 9, 11:08 AM EDTAreal Flood AdvisoryCTPColumbia, Dauphin, Juniata, Montour, Northumberland, Perry and 1 more3 hr
Jul 9, 11:36 AM EDTFlash Flood WarningCTPJuniata, Perry4 hr
Jul 9, 11:46 AM EDTSpecial Weather StatementCTPAdams29 min
Jul 9, 11:56 AM EDTFlash Flood WarningCTPColumbia, Montour, Northumberland, Snyder4 hr
Jul 9, 12:13 PM EDTSpecial Weather StatementCTPLebanon17 min
Jul 9, 12:21 PM EDTAreal Flood AdvisoryCTPAdams, Cumberland, Franklin3 hr
Jul 9, 12:35 PM EDTSpecial Weather StatementCTPDauphin40 min
Jul 9, 12:47 PM EDTSpecial Weather StatementCTPUnion28 min
Jul 9, 1:03 PM EDTSpecial Weather StatementCTPLycoming27 min
Jul 9, 1:16 PM EDTAreal Flood AdvisoryCTPColumbia, Lycoming, Sullivan3 hr
Jul 9, 1:46 PM EDTAreal Flood AdvisoryCTPCumberland, Dauphin, York35 min
Jul 9, 2:10 PM EDTAreal Flood AdvisoryCTPLancaster, Lebanon111 min
Jul 9, 2:21 PM EDTFlash Flood WarningCTPCumberland, Dauphin, York117 min
Jul 9, 2:48 PM EDTSpecial Weather StatementCTPYork42 min
Jul 9, 3:09 PM EDTAreal Flood AdvisoryCTPLancaster, Lebanon3 hr
Jul 9, 3:16 PM EDTSpecial Weather StatementCTPLancaster29 min
Jul 9, 3:27 PM EDTAreal Flood WarningCTPDauphin, Juniata, Northumberland, Perry, Snyder3 hr
Jul 9, 3:29 PM EDTSevere Thunderstorm WarningCTPLancaster31 min
Jul 9, 3:43 PM EDTAreal Flood AdvisoryCTPColumbia, Montour, Northumberland, Snyder3 hr
Jul 9, 4:18 PM EDTAreal Flood AdvisoryCTPCumberland, Dauphin, York53 min

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 2023Every severe thunderstorm warning in 2023

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.