Alert archive / Georgia / Mesoscale Discussions in 2017

Mesoscale Discussion 248

March 1, 20179 counties in Alabama; 34 counties in Georgia

The Storm Prediction Center issued this mesoscale discussion at Mar 1, 2017, 2:43 PM CST for 9 counties in Alabama; 34 counties in Georgia. It was in force for 3 hr.

The area

The outline as issued.

The facts

Issued: Mar 1, 2017, 2:43 PM CST (20:43 UTC)
Expired: Mar 1, 2017, 5:15 PM CST
In force: 3 hr
Issued by: the Storm Prediction Center
Chance of a watch: 40%

All 43 counties

Autauga County, AL, Chambers County, AL, Chilton County, AL, Clay County, AL, Coosa County, AL, Elmore County, AL, Lee County, AL, Randolph County, AL, Tallapoosa County, AL, Barrow County, GA, Butts County, GA, Carroll County, GA, Clarke County, GA, Clayton County, GA, Cobb County, GA, Coweta County, GA, DeKalb County, GA, Douglas County, GA, Fayette County, GA, Fulton County, GA, Greene County, GA, Gwinnett County, GA, Harris County, GA, Heard County, GA, Henry County, GA, Jackson County, GA, Jasper County, GA, Jones County, GA, Lamar County, GA, Meriwether County, GA, Monroe County, GA, Morgan County, GA, Newton County, GA, Oconee County, GA, Oglethorpe County, GA, Pike County, GA, Putnam County, GA, Rockdale County, GA, Spalding County, GA, Talbot County, GA, Troup County, GA, Upson County, GA, Walton County, GA

The radar

The Atlanta radar (KFFC), 57 km from the middle of the area, began a volume at 20:45 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.

Severe Thunderstorm Watch 60Mar 1, 3:45 PM CST

The nearest sounding before it

Peachtre/Fal Fld, GA (KFFC), launched 12:00Z, 8.7 hours before the alert went out and 63 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 680 m above ground
0-6 km bulk shear: 53 kt
0-1 km storm-relative helicity: 173 m²/s²
0-3 km storm-relative helicity: 306 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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
Mar 1, 4:19 AM CST	Mesoscale Discussion	SPC	Lauderdale	56 min
Mar 1, 5:28 AM CST	Mesoscale Discussion	SPC	Lauderdale	2 hr
Mar 1, 10:08 AM CST	Mesoscale Discussion	SPC	Blount, Calhoun, Cherokee, Colbert, Cullman, DeKalb and 19 more	2 hr
Mar 1, 11:48 AM CST	Tornado Watch	SPC	Blount, Calhoun, Cherokee, Colbert, Cullman, DeKalb and 20 more	6 hr
Mar 1, 2:11 PM CST	Mesoscale Discussion	SPC	Blount, Calhoun, Cherokee, Cullman, DeKalb, Etowah and 7 more	2 hr
Mar 1, 3:43 PM CST	Severe Thunderstorm Watch	SPC	Autauga, Bibb, Chambers, Chilton, Clay, Cleburne and 10 more	4 hr
Mar 1, 5:54 PM CST	Mesoscale Discussion	SPC	Autauga, Bibb, Chambers, Chilton, Choctaw, Clarke and 16 more	2 hr
Mar 1, 1:07 PM CST	Mesoscale Discussion	SPC	Rabun	113 min
Mar 1, 2:02 PM CST	Severe Thunderstorm Watch	SPC	Elbert, Franklin, Habersham, Hart, Rabun, Stephens	7 hr

Nearby

Mesoscale Discussions in Georgia, 2017 Mesoscale Discussions in Alabama, 2017 Every mesoscale discussion in 2017

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.