Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2010

Severe Thunderstorm Warning 94, NWS State College, PA

June 24, 2010Somerset County, Pennsylvania

NWS State College, PA issued this severe thunderstorm warning at Jun 24, 2010, 12:20 PM EDT for Somerset County, Pennsylvania. It was in force for 42 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
Jun 24, 2010, 12:20 PM EDT (16:20 UTC)
Expired
Jun 24, 2010, 1:02 PM EDT
In force
42 min
Issued by
NWS State College, PA
Area
Storm-based polygon

County Somerset County, PA

The radar

The Pittsburgh radar (KPBZ), 119 km from the middle of the area, began a volume at 16:23 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 watch it was issued in

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

IssuedProductOfficeLasted
Jun 24, 10:19 AM EDTSevere Thunderstorm WatchSPC8 hr

The nearest sounding before it

Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 4.3 hours before the alert went out and 257 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, Phillips Aaf/Abe, MD at 12:00Z on 2010-06-24Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 126 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, Phillips Aaf/Abe, MD at 12:00Z on 2010-06-24The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 133 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
126 J/kg
Mixed-layer CIN
-170 J/kg
Mixed-layer LCL
1592 m above ground
0-6 km bulk shear
36 kt
0-1 km storm-relative helicity
133 m²/s²
0-3 km storm-relative helicity
65 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 Jun 24, 10:45 AM EDT, 1 hour 35 minutes earlier.

Area forecast discussion, Jun 24, 10:45 AM EDT, 1 hour 35 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, Jun 24, 12:12 PM EDT, 8 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

Special weather statement, Jun 24, 9:11 AM EDT, 3 hours 9 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, Jun 24, 9:45 AM EDT, 2 hours 35 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, Jun 24, 10:10 AM EDT, 2 hours 10 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE STATE COLLEGE PA
1010 AM EDT THU JUN 24 2010

PAZ010>012-017-018-241500-
CAMERON PA-CLEARFIELD PA-ELK PA-NORTHERN CENTRE PA-
NORTHERN CLINTON PA-
1010 AM EDT THU JUN 24 2010

...A LINE OF STRONG THUNDERSTORMS WILL AFFECT NORTHERN CLEARFIELD...
NORTHWESTERN CENTRE...SOUTHERN CAMERON...SOUTHERN ELK AND WEST
CENTRAL CLINTON COUNTIES...

AT 1009 AM EDT...A LINE OF STRONG THUNDERSTORMS WAS LOCATED FROM
SIGEL TO BROOKVILLE...MOVING EAST AT 60 MPH.

WIND GUSTS OF 40 TO 50 MPH ARE POSSIBLE WITH THESE STORMS. THESE
STORMS WILL BE NEAR PORTLAND MILLS AROUND 1020 AM...RIDGWAY AROUND
1030 AM...MEDIX RUN AROUND 1040 AM...BENEZETTE AROUND 1050 AM AND
DRIFTWOOD AROUND 1100 AM.

THIS WILL IMPACT I-80 BETWEEN MILE MARKERS 97 AND 123.

THIS WILL ALSO IMPACT THE FOLLOWING MAJOR ROADS...ROUTE 119...ROUTE
219...ROUTE 322...STATE ROAD 120...STATE ROAD 153...STATE ROAD 255.

LAT...LON 4143 7909 4142 7815 4123 7800 4101 7801
      4102 7881 4114 7881 4120 7878 4121 7872
      4123 7875 4127 7875 4137 7896 4135 7902
      4135 7909 4142 7910

FORECASTER: STEINBUGL
Special weather statement, Jun 24, 10:59 AM EDT, 1 hour 21 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE STATE COLLEGE PA
1059 AM EDT THU JUN 24 2010

PAZ037-041-042-241545-
NORTHERN LYCOMING PA-SULLIVAN PA-TIOGA PA-
1059 AM EDT THU JUN 24 2010

...A STRONG THUNDERSTORM WILL AFFECT NORTHWESTERN LYCOMING...
NORTHWESTERN SULLIVAN AND SOUTHERN TIOGA COUNTIES...

AT 1055 AM EDT...A STRONG THUNDERSTORM WAS 13 MILES SOUTHWEST OF
WELLSBORO...MOVING EAST AT 50 MPH.

WIND GUSTS TO 40 MPH ARE POSSIBLE WITH THIS STORM. VERY HEAVY RAIN
WILL FALL FROM THIS STORM...AND WILL CAUSE WATER TO POND ON ROADS AND
FILL POOR DRAINAGE AREAS. THIS STORM WILL BE NEAR MORRIS AROUND 1110
AM...BLOSSBURG AROUND 1120 AM...OGDENSBURG AROUND 1130 AM...SHUNK
AROUND 1140 AM AND LINCOLN FALLS AROUND 1150 AM.

THIS WILL IMPACT THE FOLLOWING MAJOR ROADS...ROUTE 15...STATE ROAD
14.

LAT...LON 4160 7687 4158 7664 4148 7664 4152 7755
      4170 7755 4171 7689

FORECASTER: STEINBUGL
Special weather statement, Jun 24, 12:01 PM EDT, 19 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE STATE COLLEGE PA
1201 PM EDT THU JUN 24 2010

PAZ024-025-033-034-241630-
BEDFORD PA-BLAIR PA-CAMBRIA PA-SOMERSET PA-
1201 PM EDT THU JUN 24 2010

...A LINE OF STRONG THUNDERSTORMS WILL AFFECT NORTHWESTERN BEDFORD...
SOMERSET...SOUTHERN BLAIR AND SOUTHERN CAMBRIA COUNTIES...

AT NOON EDT...A LINE OF STRONG THUNDERSTORMS WAS LOCATED FROM
WESTMONT TO MCCHESNEYTOWN-LOYA TO 21 MILES SOUTHWEST OF
CONNELLSVILLE...MOVING EAST AT 55 MPH.

WIND GUSTS TO 40 MPH ARE POSSIBLE WITH THESE STORMS. THESE STORMS
WILL BE NEAR NANTY-GLO AROUND 1210 PM...LILLY AROUND 1220 PM AND
OGLETOWN AROUND 1230 PM.

THIS WILL IMPACT THE FOLLOWING CENTRAL PENNSYLVANIA INTERSTATES...THE
PENNSYLVANIA TURNPIKE BETWEEN MILE MARKERS 100 AND 121...I-99 BETWEEN
MILE MARKERS 17 AND 32.

THIS WILL ALSO IMPACT THE FOLLOWING MAJOR ROADS...THE JOHNSTOWN
EXPRESSWAY...ROUTE 22...ROUTE 30...ROUTE 40...ROUTE 219...ROUTE
220...ROUTE 422...STATE ROAD 56.

LAT...LON 3972 7940 3974 7942 3978 7940 3980 7936
      3982 7937 3985 7942 3990 7941 4008 7928
      4011 7923 4012 7919 4037 7899 4051 7892
      4048 7822 4017 7858 3971 7924

FORECASTER: STEINBUGL

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 23, 9:42 PM EDTSpecial Weather StatementCTPWarren63 min
Jun 23, 10:24 PM EDTSpecial Weather StatementCTPMcKean51 min
Jun 23, 11:04 PM EDTSpecial Weather StatementCTPForest41 min
Jun 23, 11:23 PM EDTSpecial Weather StatementCTPWarren52 min
Jun 23, 11:53 PM EDTSevere Thunderstorm WarningCTPMcKean, Warren52 min
Jun 24, 12:28 AM EDTSpecial Weather StatementCTPCameron, Elk, McKean62 min
Jun 24, 12:50 AM EDTAreal Flood AdvisoryCTPMcKean, Warren4 hr
Jun 24, 1:03 AM EDTSpecial Weather StatementCTPMcKean42 min
Jun 24, 1:07 AM EDTFlash Flood WatchCTPCameron, Elk, McKean, Potter, Tioga, Warren9 hr
Jun 24, 1:27 AM EDTSpecial Weather StatementCTPCameron, Potter, Tioga78 min
Jun 24, 1:46 AM EDTSpecial Weather StatementCTPPotter59 min
Jun 24, 2:04 AM EDTSpecial Weather StatementCTPWarren56 min
Jun 24, 2:27 AM EDTSpecial Weather StatementCTPTioga33 min
Jun 24, 2:38 AM EDTSpecial Weather StatementCTPPotter, Tioga22 min
Jun 24, 3:04 AM EDTSpecial Weather StatementCTPSullivan, Tioga41 min
Jun 24, 4:07 AM EDTSpecial Weather StatementCTPSullivan23 min
Jun 24, 9:11 AM EDTSpecial Weather StatementCTPCameron, Elk, McKean34 min
Jun 24, 9:45 AM EDTSpecial Weather StatementCTPCameron, Clinton, Potter, Tioga45 min
Jun 24, 10:10 AM EDTSpecial Weather StatementCTPClearfield50 min
Jun 24, 10:59 AM EDTSpecial Weather StatementCTPTioga46 min
Jun 24, 12:01 PM EDTSpecial Weather StatementCTPSomerset29 min
Jun 24, 12:36 PM EDTSpecial Weather StatementCTPBedford, Somerset24 min
Jun 24, 1:07 PM EDTSpecial Weather StatementCTPCumberland, Dauphin, Lebanon, Perry, Schuylkill53 min
Jun 24, 1:09 PM EDTSpecial Weather StatementCTPBedford51 min
Jun 24, 1:21 PM EDTSevere Thunderstorm WarningCTPBedford, Cumberland, Franklin, Fulton, Huntingdon, Perry39 min
Jun 24, 1:29 PM EDTSevere Thunderstorm WarningCTPCumberland, Dauphin, Franklin, Lancaster, Lebanon, Perry and 1 more61 min
Jun 24, 1:55 PM EDTSevere Thunderstorm WarningCTPAdams, Cumberland, Franklin, York50 min
Jun 24, 2:02 PM EDTSevere Thunderstorm WarningCTPLancaster, Lebanon, York58 min
Jun 24, 2:43 PM EDTSevere Thunderstorm WarningCTPAdams, Lancaster, York62 min

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 2010Every severe thunderstorm warning in 2010

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.