Alert archive / Maryland / Mesoscale Discussions in 2004

Mesoscale Discussion 906

May 25, 20044 states

The Storm Prediction Center issued this mesoscale discussion at May 25, 2004, 9:50 PM EDT for 4 states. It was in force for 55 min.

The area

The outline as issued.

The facts

Issued: May 25, 2004, 9:50 PM EDT (01:50 UTC)
Expired: May 25, 2004, 10:45 PM EDT
In force: 55 min
Issued by: the Storm Prediction Center

All 22 counties

Kent County, DE, Sussex County, DE, Calvert County, MD, Caroline County, MD, Dorchester County, MD, Queen Anne's County, MD, Saint Mary's County, MD, Somerset County, MD, Talbot County, MD, Wicomico County, MD, Worcester County, MD, Atlantic County, NJ, Cape May County, NJ, Cumberland County, NJ, Salem County, NJ, Accomack County, VA, Essex County, VA, King and Queen County, VA, Lancaster County, VA, Northumberland County, VA, Richmond County, VA, Westmoreland County, VA

The nearest sounding before it

Wallops Is Stn, VA (KWAL), launched 00:00Z, 1.8 hours before the alert went out and 79 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: 1416 J/kg
Mixed-layer CIN: -62 J/kg
Mixed-layer LCL: 992 m above ground
0-6 km bulk shear: 23 kt
0-1 km storm-relative helicity: 80 m²/s²
0-3 km storm-relative helicity: 153 m²/s²
Significant tornado parameter: 0.5
Supercell composite: 2.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

<!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>

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 26, 5:45 PM EDT	Severe Thunderstorm Watch	SPC	New Castle	5 hr
May 26, 12:55 PM EDT	Mesoscale Discussion	SPC	Allegany, Garrett	95 min
May 26, 5:15 PM EDT	Mesoscale Discussion	SPC	Carroll	2 hr
May 26, 1:38 PM EDT	Mesoscale Discussion	SPC	Albemarle, Alleghany, Amherst, Appomattox, Arlington, Augusta and 72 more	97 min
May 26, 2:50 PM EDT	Severe Thunderstorm Watch	SPC	Alleghany, Bath, Bland, Buchanan, Clarke, Craig and 20 more	7 hr
May 26, 4:25 PM EDT	Severe Thunderstorm Watch	SPC	Lee, Scott, Washington, Wise, City of Bristol, City of Norton	6 hr
May 26, 6:27 PM EDT	Mesoscale Discussion	SPC	Lee, Scott, Washington, City of Bristol, City of Norton	93 min

Nearby

Mesoscale Discussions in Maryland, 2004 Mesoscale Discussions in Virginia, 2004 Mesoscale Discussions in New Jersey, 2004 Every mesoscale discussion in 2004

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.