Alert archive / Virginia / Severe Thunderstorm Warnings in 2007

Severe Thunderstorm Warning 196, NWS Baltimore/Washington

July 19, 2007Fauquier County, Virginia

NWS Baltimore/Washington issued this severe thunderstorm warning at Jul 19, 2007, 2:01 PM EDT for Fauquier County, Virginia. It was in force for 44 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 19, 2007, 2:01 PM EDT (18:01 UTC)
Expired: Jul 19, 2007, 2:45 PM EDT
In force: 44 min
Issued by: NWS Baltimore/Washington
Area: Counties, with a storm outline in the text

County Fauquier County, VA

The radar

The Sterling radar (KLWX), 38 km from the middle of the area, began a volume at 18:03 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

Roanoke, VA (KRNK), launched 12:00Z, 6.0 hours before the alert went out and 226 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: 23 J/kg
Mixed-layer CIN: -188 J/kg
Mixed-layer LCL: 1295 m above ground
0-6 km bulk shear: 9 kt
0-1 km storm-relative helicity: -90 m²/s²
0-3 km storm-relative helicity: -59 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 Jul 19, 10:32 AM EDT, 3 hours 29 minutes earlier.

Area forecast discussion, Jul 19, 10:32 AM EDT, 3 hours 29 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 19, 10:35 AM EDT, 3 hours 26 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, Jul 19, 1:57 PM EDT, 4 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
157 PM EDT THU JUL 19 2007

VAZ041-191845-
FAUQUIER VA-
157 PM EDT THU JUL 19 2007

...STRONG THUNDERSTORMS TO AFFECT CENTRAL FAUQUIER COUNTY...

AT 157 PM EDT...DOPPLER RADAR INDICATED A STRONG THUNDERSTORM 4 MILES
WEST OF TURNBULL...MOVING EAST AT 30 MPH.

THIS STORM WILL BE CAPABLE OF PRODUCING SMALL HAIL AND WIND GUSTS TO
40 MPH.

THE COMMUNITIES OF WARRENTON AND BEALETON WILL BE AFFECTED BY THIS
STORM.

GMS

The office that day

Everything else NWS Baltimore/Washington issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 19, 2:17 PM EDT	Severe Thunderstorm Warning	LWX	Culpeper	43 min
Jul 19, 2:41 PM EDT	Severe Thunderstorm Warning	LWX	Stafford	49 min
Jul 19, 2:52 PM EDT	Special Marine Warning	LWX		83 min
Jul 19, 3:07 PM EDT	Severe Thunderstorm Warning	LWX	King George	53 min
Jul 19, 3:22 PM EDT	Special Marine Warning	LWX		96 min
Jul 19, 4:20 PM EDT	Special Marine Warning	LWX		72 min
Jul 19, 3:15 PM EDT	Severe Thunderstorm Warning	LWX	Saint Mary's	58 min
Jul 19, 3:24 PM EDT	Severe Thunderstorm Warning	LWX	Calvert	50 min
Jul 19, 4:21 PM EDT	Severe Thunderstorm Warning	LWX	Harford	38 min

Nearby

Severe Thunderstorm Warnings in Virginia, 2007 Every severe thunderstorm warning in 2007

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.