Alert archive / Oklahoma / Mesoscale Discussions in 2009

Mesoscale Discussion 665

May 2, 200940 counties in Oklahoma; 4 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at May 2, 2009, 2:58 AM CDT for 40 counties in Oklahoma; 4 counties in Texas. It was in force for 3 hr.

The area

The outline as issued.

The facts

Issued
May 2, 2009, 2:58 AM CDT (07:58 UTC)
Expired
May 2, 2009, 5:30 AM CDT
In force
3 hr
Issued by
the Storm Prediction Center
All 44 counties

Beckham County, OK, Blaine County, OK, Caddo County, OK, Canadian County, OK, Cleveland County, OK, Comanche County, OK, Creek County, OK, Custer County, OK, Dewey County, OK, Ellis County, OK, Garfield County, OK, Grady County, OK, Grant County, OK, Greer County, OK, Harmon County, OK, Jackson County, OK, Kay County, OK, Kingfisher County, OK, Kiowa County, OK, Lincoln County, OK, Logan County, OK, Major County, OK, Mayes County, OK, McClain County, OK, Noble County, OK, Okfuskee County, OK, Oklahoma County, OK, Okmulgee County, OK, Osage County, OK, Pawnee County, OK, Payne County, OK, Pottawatomie County, OK, Roger Mills County, OK, Rogers County, OK, Seminole County, OK, Tulsa County, OK, Wagoner County, OK, Washington County, OK, Washita County, OK, Woodward County, OK, Collingsworth County, TX, Gray County, TX, Hemphill County, TX, Wheeler County, TX

The radar

The Norman radar (KTLX), 49 km from the middle of the area, began a volume at 08:00 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 nearest sounding before it

Fort Worth, TX (KFWD), launched 00:00Z, 8.0 hours before the alert went out and 309 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, Fort Worth, TX at 00:00Z on 2009-05-02Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 3417 joules per kilogram.LCLEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Fort Worth, TX at 00:00Z on 2009-05-02The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 105 square meters per square second.193958Sfc1 km3 km6 km9 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
3417 J/kg
Mixed-layer CIN
-2 J/kg
Mixed-layer LCL
667 m above ground
0-6 km bulk shear
30 kt
0-1 km storm-relative helicity
105 m²/s²
0-3 km storm-relative helicity
145 m²/s²
Significant tornado parameter
1.5
Supercell composite
7.4

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
May 1, 7:19 PM CDTMesoscale DiscussionSPCAtoka, Bryan, Carter, Cleveland, Coal, Comanche and 16 more86 min
May 1, 9:36 PM CDTMesoscale DiscussionSPCAdair, Atoka, Bryan, Carter, Cherokee, Choctaw and 24 more84 min
May 1, 9:56 PM CDTSevere Thunderstorm WatchSPCChoctaw, Haskell, Latimer, LeFlore, McCurtain, Pittsburg and 2 more6 hr
May 2, 1:45 AM CDTMesoscale DiscussionSPCChoctaw, Haskell, Latimer, LeFlore, McCurtain, Pittsburg and 1 more90 min
May 2, 6:50 AM CDTMesoscale DiscussionSPCAtoka, Coal, Haskell, Hughes, Johnston, Latimer and 10 more3 hr
May 2, 9:23 AM CDTMesoscale DiscussionSPCChoctaw, Latimer, LeFlore, McCurtain, Pushmataha97 min
May 2, 12:17 PM CDTTornado WatchSPCAtoka, Bryan, Choctaw, Coal, Johnston, McCurtain and 2 more7 hr
May 2, 6:03 PM CDTTornado WatchSPCMcCurtain6 hr
May 2, 1:24 PM CDTMesoscale DiscussionSPCBell, Blanco, Bosque, Burnet, Collin, Coryell and 31 more66 min
May 2, 1:56 PM CDTTornado WatchSPCBell, Bosque, Coryell, Dallas, Ellis, Falls and 18 more4 hr
May 2, 3:04 PM CDTMesoscale DiscussionSPCAnderson, Camp, Cherokee, Gregg, Harrison, Houston and 10 more26 min
May 2, 3:47 PM CDTMesoscale DiscussionSPCBowie, Camp, Cass, Dallas, Delta, Franklin and 12 more58 min
May 2, 5:10 PM CDTMesoscale DiscussionSPCHarrison, Panola, Rusk65 min
May 2, 5:25 PM CDTMesoscale DiscussionSPCBowie95 min
May 2, 6:49 PM CDTMesoscale DiscussionSPCCamp, Cass, Franklin, Hopkins, Hunt, Kaufman and 7 more86 min

Nearby

Mesoscale Discussions in Oklahoma, 2009Mesoscale Discussions in Texas, 2009Every mesoscale discussion in 2009

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.