Alert archive / Virginia / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 87, NWS Baltimore/Washington

June 8, 20094 counties in Virginia

NWS Baltimore/Washington issued this severe thunderstorm warning at Jun 8, 2009, 8:20 PM EDT for 4 counties in Virginia. 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: Jun 8, 2009, 8:20 PM EDT (00:20 UTC)
Expired: Jun 8, 2009, 8:46 PM EDT
In force: 26 min
Issued by: NWS Baltimore/Washington
Area: Storm-based polygon

Counties Greene County, VA, Madison County, VA, Page County, VA, Rockingham County, VA

The radar

The Sterling radar (KLWX), 107 km from the middle of the area, began a volume at 00:21 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 00:00Z, 0.3 hours before the alert went out and 112 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: 245 J/kg
Mixed-layer CIN: -32 J/kg
Mixed-layer LCL: 1873 m above ground
0-6 km bulk shear: 19 kt
0-1 km storm-relative helicity: -5 m²/s²
0-3 km storm-relative helicity: -6 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 Baltimore/Washington wrote its last area forecast discussion before this severe thunderstorm warning went out at Jun 8, 5:21 PM EDT, 2 hours 59 minutes earlier.

Area forecast discussion, Jun 8, 5:21 PM EDT, 2 hours 59 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 8, 3:37 PM EDT, 4 hours 43 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 8, 3:40 PM EDT, 4 hours 40 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 8, 6:23 PM EDT, 1 hour 57 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, Jun 8, 7:43 PM EDT, 37 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 8, 7:50 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, Jun 8, 8:01 PM EDT, 19 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 Baltimore/Washington issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 8, 8:07 PM EDT	Severe Thunderstorm Warning	LWX	Albemarle, Greene, Madison, Orange, Rockingham	38 min
Jun 9, 5:27 AM EDT	Severe Thunderstorm Warning	LWX	Culpeper	48 min
Jun 9, 5:47 AM EDT	Severe Thunderstorm Warning	LWX	Arlington, Fairfax, City of Alexandria, City of Fairfax, City of Falls Church	28 min
Jun 9, 5:54 AM EDT	Special Marine Warning	LWX		66 min
Jun 9, 6:32 AM EDT	Special Marine Warning	LWX		81 min
Jun 9, 6:36 AM EDT	Special Marine Warning	LWX		84 min
Jun 9, 8:32 AM EDT	Special Marine Warning	LWX		58 min
Jun 9, 1:18 PM EDT	Flash Flood Watch	LWX	Arlington, Clarke, Culpeper, Fairfax, Frederick, Greene and 19 more	7 hr
Jun 9, 2:44 PM EDT	Severe Thunderstorm Warning	LWX	Frederick	46 min
Jun 9, 3:04 PM EDT	Severe Thunderstorm Warning	LWX	Frederick	41 min
Jun 9, 3:23 PM EDT	Severe Thunderstorm Warning	LWX	Shenandoah	52 min
Jun 9, 3:38 PM EDT	Severe Thunderstorm Warning	LWX	Augusta, Rockingham, City of Harrisonburg	52 min
Jun 9, 3:43 PM EDT	Severe Thunderstorm Warning	LWX	Frederick, City of Winchester	47 min
Jun 9, 3:47 PM EDT	Severe Thunderstorm Warning	LWX	Frederick, Shenandoah	43 min
Jun 9, 3:51 PM EDT	Severe Thunderstorm Warning	LWX	Loudoun	39 min
Jun 9, 3:55 PM EDT	Flash Flood Warning	LWX	Augusta, Rockingham, City of Harrisonburg	2 hr
Jun 9, 3:57 PM EDT	Special Marine Warning	LWX		2 hr
Jun 9, 3:59 PM EDT	Severe Thunderstorm Warning	LWX	Page, Rockingham, City of Harrisonburg	46 min
Jun 9, 4:10 PM EDT	Severe Thunderstorm Warning	LWX	Clarke, Frederick, Loudoun, Warren, City of Winchester	50 min
Jun 9, 4:15 PM EDT	Severe Thunderstorm Warning	LWX	Page, Shenandoah	45 min
Jun 9, 4:21 PM EDT	Severe Thunderstorm Warning	LWX	Clarke, Fauquier, Frederick, Page, Rappahannock, Shenandoah and 1 more	39 min
Jun 9, 4:26 PM EDT	Severe Thunderstorm Warning	LWX	Fairfax, Loudoun	49 min
Jun 9, 4:27 PM EDT	Severe Thunderstorm Warning	LWX	Albemarle, Augusta, Rockingham, City of Waynesboro	48 min
Jun 9, 4:47 PM EDT	Special Marine Warning	LWX		118 min
Jun 9, 4:47 PM EDT	Special Marine Warning	LWX		118 min
Jun 9, 4:52 PM EDT	Severe Thunderstorm Warning	LWX	Clarke, Culpeper, Fairfax, Fauquier, Loudoun, Page and 3 more	53 min
Jun 9, 4:55 PM EDT	Severe Thunderstorm Warning	LWX	Madison, Page, Rappahannock, Shenandoah	54 min
Jun 9, 4:59 PM EDT	Severe Thunderstorm Warning	LWX	Fairfax, Loudoun	61 min
Jun 9, 5:01 PM EDT	Special Marine Warning	LWX		119 min
Jun 9, 5:02 PM EDT	Severe Thunderstorm Warning	LWX	Albemarle, Augusta, Nelson, City of Waynesboro	58 min
Jun 9, 5:13 PM EDT	Severe Thunderstorm Warning	LWX	Arlington, Fairfax, Loudoun, City of Alexandria, City of Fairfax, City of Falls Church	62 min
Jun 9, 5:22 PM EDT	Severe Thunderstorm Warning	LWX	Albemarle, City of Charlottesville	53 min
Jun 9, 5:26 PM EDT	Special Marine Warning	LWX		2 hr
Jun 9, 5:27 PM EDT	Severe Thunderstorm Warning	LWX	Culpeper, Fairfax, Fauquier, Loudoun, Madison, Orange and 6 more	63 min
Jun 9, 5:30 PM EDT	Special Marine Warning	LWX		2 hr
Jun 9, 5:46 PM EDT	Severe Thunderstorm Warning	LWX	Culpeper, Fairfax, Fauquier, King George, Orange, Prince William and 3 more	59 min
Jun 9, 5:59 PM EDT	Special Marine Warning	LWX		46 min
Jun 9, 6:04 PM EDT	Severe Thunderstorm Warning	LWX	Albemarle, Nelson	41 min
Jun 9, 6:12 PM EDT	Severe Thunderstorm Warning	LWX	Nelson	48 min
Jun 9, 6:17 PM EDT	Severe Thunderstorm Warning	LWX	King George	43 min
Jun 9, 6:45 PM EDT	Severe Thunderstorm Warning	LWX	King George, Orange, Spotsylvania, Stafford, City of Fredericksburg	45 min
Jun 9, 6:49 PM EDT	Severe Thunderstorm Warning	LWX	Albemarle, Nelson	26 min
Jun 9, 7:25 PM EDT	Special Marine Warning	LWX		50 min
Jun 9, 6:02 AM EDT	Severe Thunderstorm Warning	LWX	Montgomery, Prince George's	43 min
Jun 9, 6:51 AM EDT	Severe Thunderstorm Warning	LWX	Charles	39 min
Jun 9, 2:28 PM EDT	Severe Thunderstorm Warning	LWX	Allegany	47 min
Jun 9, 2:52 PM EDT	Severe Thunderstorm Warning	LWX	Allegany	38 min
Jun 9, 3:09 PM EDT	Severe Thunderstorm Warning	LWX	Frederick, Washington	51 min
Jun 9, 4:39 PM EDT	Severe Thunderstorm Warning	LWX	Harford	39 min
Jun 9, 5:01 PM EDT	Flash Flood Warning	LWX	Baltimore, City of Baltimore	119 min
Jun 9, 5:13 PM EDT	Flash Flood Warning	LWX	Harford	2 hr
Jun 9, 5:18 PM EDT	Severe Thunderstorm Warning	LWX	Baltimore, Harford, Howard, City of Baltimore	57 min

Nearby

Severe Thunderstorm Warnings in Virginia, 2009 Every severe thunderstorm warning in 2009

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.