Alert archive / Virginia / Mesoscale Discussions in 2022

Mesoscale Discussion 936

May 27, 202211 counties in Maryland; 6 counties in North Carolina; 38 counties in Virginia

The Storm Prediction Center issued this mesoscale discussion at May 27, 2022, 10:59 AM EDT for 11 counties in Maryland; 6 counties in North Carolina; 38 counties in Virginia. It was in force for 91 min.

The area

The outline as issued.

The facts

Issued: May 27, 2022, 10:59 AM EDT (14:59 UTC)
Expired: May 27, 2022, 12:30 PM EDT
In force: 91 min
Issued by: the Storm Prediction Center
Concerning: Tornado watch 276

All 55 counties

Anne Arundel County, MD, Baltimore County, MD, Calvert County, MD, Carroll County, MD, Charles County, MD, City of Baltimore, MD, Frederick County, MD, Howard County, MD, Montgomery County, MD, Prince George's County, MD, Saint Mary's County, MD, Edgecombe County, NC, Halifax County, NC, Nash County, NC, Northampton County, NC, Warren County, NC, Wilson County, NC, Arlington County, VA, Brunswick County, VA, Caroline County, VA, Charles City County, VA, Chesterfield County, VA, City of Alexandria, VA, City of Colonial Heights, VA, City of Emporia, VA, City of Fairfax, VA, City of Falls Church, VA, City of Fredericksburg, VA, City of Hopewell, VA, City of Manassas, VA, City of Manassas Park, VA, City of Petersburg, VA, City of Richmond, VA, Dinwiddie County, VA, Essex County, VA, Fairfax County, VA, Fauquier County, VA, Greensville County, VA, Hanover County, VA, Henrico County, VA, James City County, VA, King and Queen County, VA, King George County, VA, King William County, VA, Loudoun County, VA, New Kent County, VA, Prince George County, VA, Prince William County, VA, Richmond County, VA, Southampton County, VA, Spotsylvania County, VA, Stafford County, VA, Surry County, VA, Sussex County, VA, Westmoreland County, VA

The radar

The Norfolk radar (KAKQ), 71 km from the middle of the area, began a volume at 14:59 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 watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 12:00Z, 3.0 hours before the alert went out and 166 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: 221 J/kg
Mixed-layer CIN: -19 J/kg
Mixed-layer LCL: 481 m above ground
0-6 km bulk shear: 48 kt
0-1 km storm-relative helicity: 94 m²/s²
0-3 km storm-relative helicity: 182 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 0.4

Open this sounding in Storm Lab

The text

As transmitted.

<!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 27, 6:24 AM EDT	Tornado Watch	SPC	Anne Arundel, Baltimore, Calvert, Carroll, Charles, Frederick and 6 more	8 hr
May 27, 8:13 AM EDT	Mesoscale Discussion	SPC	Charles, Prince George's	2 hr
May 27, 11:50 AM EDT	Tornado Watch	SPC	Cecil, Dorchester, Harford, Somerset, Wicomico, Worcester	4 hr
May 27, 11:55 AM EDT	Mesoscale Discussion	SPC	Caroline, Cecil	95 min
May 27, 12:57 PM EDT	Severe Thunderstorm Watch	SPC	Caroline, Kent, Queen Anne's, Talbot	5 hr
May 27, 5:45 PM EDT	Severe Thunderstorm Watch	SPC	Anne Arundel, Calvert, Charles, Prince George's, Saint Mary's	4 hr
May 27, 7:22 PM EDT	Mesoscale Discussion	SPC	Calvert, Charles, Prince George's, Saint Mary's	83 min
May 26, 8:32 PM EDT	Mesoscale Discussion	SPC	Alexander, Cabarrus, Catawba, Davidson, Davie, Forsyth and 8 more	118 min
May 27, 5:00 AM EDT	Mesoscale Discussion	SPC	Anson, Cabarrus, Davidson, Davie, Gaston, Guilford and 11 more	2 hr
May 27, 6:01 AM EDT	Mesoscale Discussion	SPC	Alamance, Caswell, Durham, Franklin, Granville, Guilford and 6 more	119 min
May 27, 10:44 AM EDT	Mesoscale Discussion	SPC	Beaufort, Bertie, Camden, Chowan, Craven, Currituck and 14 more	91 min
May 27, 2:21 PM EDT	Mesoscale Discussion	SPC	Bladen, Chatham, Columbus, Cumberland, Duplin, Durham and 20 more	84 min
May 27, 3:38 PM EDT	Mesoscale Discussion	SPC	Alleghany, Ashe, Surry	97 min
May 27, 4:26 PM EDT	Mesoscale Discussion	SPC	Alamance, Bladen, Caswell, Chatham, Columbus, Cumberland and 24 more	2 hr

Nearby

Mesoscale Discussions in Virginia, 2022 Mesoscale Discussions in Maryland, 2022 Mesoscale Discussions in North Carolina, 2022 Every mesoscale discussion in 2022

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.