Alert archive / Oklahoma / Mesoscale Discussions in 2014

Mesoscale Discussion 416

April 27, 201422 counties in Oklahoma

The Storm Prediction Center issued this mesoscale discussion at Apr 27, 2014, 10:06 AM CDT for 22 counties in Oklahoma. It was in force for 84 min.

The area

The outline as issued.

The facts

Issued
Apr 27, 2014, 10:06 AM CDT (15:06 UTC)
Expired
Apr 27, 2014, 11:30 AM CDT
In force
84 min
Issued by
the Storm Prediction Center
All 22 counties

Atoka County, OK, Bryan County, OK, Cherokee County, OK, Choctaw County, OK, Coal County, OK, Craig County, OK, Creek County, OK, Haskell County, OK, Hughes County, OK, Johnston County, OK, Latimer County, OK, Mayes County, OK, McIntosh County, OK, Muskogee County, OK, Okfuskee County, OK, Okmulgee County, OK, Pittsburg County, OK, Pushmataha County, OK, Rogers County, OK, Tulsa County, OK, Wagoner County, OK, Washington County, OK

The radar

The Tulsa radar (KINX), 111 km from the middle of the area, began a volume at 15:06 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

Norman, OK (KOUN), launched 12:00Z, 3.1 hours before the alert went out and 145 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-pSkew-T log-p diagram, Norman, OK at 12:00Z on 2014-04-27Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1256 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Norman, OK at 12:00Z on 2014-04-27The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 335 square meters per square second.1939587897Sfc1 km3 km6 kmRMLM
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
1256 J/kg
Mixed-layer CIN
-16 J/kg
Mixed-layer LCL
580 m above ground
0-6 km bulk shear
50 kt
0-1 km storm-relative helicity
335 m²/s²
0-3 km storm-relative helicity
365 m²/s²
Significant tornado parameter
2.1
Supercell composite
10.7

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.

IssuedProductOfficeCountiesLasted
Apr 27, 5:09 AM CDTMesoscale DiscussionSPCAlfalfa, Blaine, Caddo, Canadian, Cleveland, Comanche and 26 more96 min
Apr 27, 5:33 AM CDTSevere Thunderstorm WatchSPCAlfalfa, Atoka, Blaine, Bryan, Caddo, Canadian and 51 more6 hr
Apr 27, 7:55 AM CDTMesoscale DiscussionSPCAtoka, Bryan, Canadian, Carter, Cherokee, Choctaw and 45 more95 min
Apr 27, 12:25 PM CDTMesoscale DiscussionSPCLeFlore, McCurtain, Sequoyah2 hr
Apr 27, 1:46 PM CDTTornado WatchSPCAdair, Cherokee, Choctaw, Craig, Delaware, Haskell and 11 more9 hr
Apr 27, 3:36 PM CDTTornado Watch PDSSPCLeFlore, McCurtain7 hr
Apr 27, 4:52 PM CDTMesoscale DiscussionSPCAdair, Cherokee, Haskell, LeFlore, McCurtain, Sequoyah53 min
Apr 27, 4:57 PM CDTMesoscale DiscussionSPCOttawa63 min
Apr 27, 6:10 PM CDTMesoscale DiscussionSPCOttawa95 min
Apr 27, 6:11 PM CDTMesoscale DiscussionSPCAdair, Haskell, LeFlore, McCurtain, Sequoyah64 min
Apr 27, 6:26 PM CDTTornado WatchSPCAdair, Cherokee, Choctaw, Delaware, Haskell, Latimer and 2 more8 hr

Nearby

Mesoscale Discussions in Oklahoma, 2014Every mesoscale discussion in 2014

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.