Alert archive / Oklahoma / Mesoscale Discussions in 2015

Mesoscale Discussion 140

March 25, 2015Labette County, Montgomery County, Kansas; 38 counties in Oklahoma

The Storm Prediction Center issued this mesoscale discussion at Mar 25, 2015, 1:45 PM CDT for Labette County, Montgomery County, Kansas; 38 counties in Oklahoma. It was in force for 3 hr.

The area

The outline as issued.

The facts

Issued: Mar 25, 2015, 1:45 PM CDT (18:45 UTC)
Expired: Mar 25, 2015, 4:15 PM CDT
In force: 3 hr
Issued by: the Storm Prediction Center
Chance of a watch: 95%

All 40 counties

Labette County, KS, Montgomery County, KS, Adair County, OK, Caddo County, OK, Canadian County, OK, Carter County, OK, Cherokee County, OK, Cleveland County, OK, Comanche County, OK, Craig County, OK, Creek County, OK, Delaware County, OK, Garvin County, OK, Grady County, OK, Hughes County, OK, Kingfisher County, OK, Lincoln County, OK, Logan County, OK, Mayes County, OK, McClain County, OK, McIntosh County, OK, Murray County, OK, Muskogee County, OK, Noble County, OK, Nowata County, OK, Okfuskee County, OK, Oklahoma County, OK, Okmulgee County, OK, Osage County, OK, Ottawa County, OK, Pawnee County, OK, Payne County, OK, Pontotoc County, OK, Pottawatomie County, OK, Rogers County, OK, Seminole County, OK, Stephens County, OK, Tulsa County, OK, Wagoner County, OK, Washington County, OK

The radar

The Norman radar (KTLX), 87 km from the middle of the area, began a volume at 18:47 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 6Mar 25, 2:15 PM CDT

The nearest sounding before it

Norman, OK (KOUN), launched 12:00Z, 6.8 hours before the alert went out and 103 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: 1301 J/kg
Mixed-layer CIN: -224 J/kg
Mixed-layer LCL: 889 m above ground
0-6 km bulk shear: 42 kt
0-1 km storm-relative helicity: 147 m²/s²
0-3 km storm-relative helicity: 324 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.7

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
Mar 25, 10:56 AM CDT	Mesoscale Discussion	SPC	Allen, Anderson, Bourbon, Butler, Coffey, Crawford and 9 more	3 hr
Mar 25, 2:16 PM CDT	Severe Thunderstorm Watch	SPC	Chautauqua, Cherokee, Cowley, Labette, Montgomery	8 hr
Mar 25, 5:33 PM CDT	Mesoscale Discussion	SPC	Cherokee	87 min
Mar 24, 7:34 PM CDT	Mesoscale Discussion	SPC	Latimer, LeFlore, Pittsburg	116 min
Mar 25, 2:50 PM CDT	Mesoscale Discussion	SPC	Cotton, Jefferson, Tillman	115 min
Mar 25, 5:09 PM CDT	Mesoscale Discussion	SPC	Caddo, Comanche, Kiowa, Washita	66 min

Nearby

Mesoscale Discussions in Oklahoma, 2015 Mesoscale Discussions in Kansas, 2015 Every mesoscale discussion in 2015

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.