Alert archive / Texas / Mesoscale Discussions in 2009
Mesoscale Discussion 2276
The Storm Prediction Center issued this mesoscale discussion at Dec 23, 2009, 7:50 PM CST for 4 states. It was in force for 85 min.
The area
The outline as issued.
The facts
- Issued
- Dec 23, 2009, 7:50 PM CST (01:50 UTC)
- Expired
- Dec 23, 2009, 9:15 PM CST
- In force
- 85 min
- Issued by
- the Storm Prediction Center
All 79 counties
Clark County, AR, Columbia County, AR, Hempstead County, AR, Howard County, AR, Lafayette County, AR, Little River County, AR, Miller County, AR, Nevada County, AR, Ouachita County, AR, Pike County, AR, Polk County, AR, Sevier County, AR, Union County, AR, Bienville Parish, LA, Bossier Parish, LA, Caddo Parish, LA, Claiborne Parish, LA, De Soto Parish, LA, Red River Parish, LA, Sabine Parish, LA, Webster Parish, LA, McCurtain County, OK, Anderson County, TX, Angelina County, TX, Bell County, TX, Bosque County, TX, Bowie County, TX, Brazos County, TX, Burleson County, TX, Camp County, TX, Cass County, TX, Cherokee County, TX, Coryell County, TX, Dallas County, TX, Delta County, TX, Ellis County, TX, Falls County, TX, Franklin County, TX, Freestone County, TX, Gregg County, TX, Grimes County, TX, Harrison County, TX, Henderson County, TX, Hill County, TX, Hopkins County, TX, Houston County, TX, Hunt County, TX, Johnson County, TX, Kaufman County, TX, Lamar County, TX, Leon County, TX, Limestone County, TX, Madison County, TX, Marion County, TX, McLennan County, TX, Milam County, TX, Morris County, TX, Nacogdoches County, TX, Navarro County, TX, Panola County, TX, Polk County, TX, Rains County, TX, Red River County, TX, Robertson County, TX, Rockwall County, TX, Rusk County, TX, Sabine County, TX, San Augustine County, TX, San Jacinto County, TX, Shelby County, TX, Smith County, TX, Titus County, TX, Trinity County, TX, Tyler County, TX, Upshur County, TX, Van Zandt County, TX, Walker County, TX, Williamson County, TX, Wood County, TX
The radar
The Dallas/Ft Worth radar (KFWS), 151 km from the middle of the area, began a volume at 01:53 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
Fort Worth, TX (KFWD), launched 00:00Z, 1.8 hours before the alert went out and 162 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.
- Mixed-layer CAPE
- 25 J/kg
- Mixed-layer CIN
- -42 J/kg
- Mixed-layer LCL
- 1512 m above ground
- 0-6 km bulk shear
- 50 kt
- 0-1 km storm-relative helicity
- -1 m²/s²
- 0-3 km storm-relative helicity
- 137 m²/s²
- Significant tornado parameter
- -0.0
- Supercell composite
- -0.0
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 |
|---|---|---|---|---|
| Dec 23, 8:48 PM CST | Tornado Watch | SPC | Columbia, Hempstead, Howard, Lafayette, Little River, Miller and 1 more | 9 hr |
| Dec 23, 11:06 PM CST | Mesoscale Discussion | SPC | Clark, Columbia, Dallas, Hempstead, Hot Spring, Howard and 7 more | 114 min |
| Dec 24, 3:30 AM CST | Mesoscale Discussion | SPC | Ashley, Bradley, Calhoun, Chicot, Columbia, Lafayette and 2 more | 2 hr |
| Dec 24, 4:50 AM CST | Tornado Watch | SPC | Ashley, Chicot, Union | 7 hr |
| Dec 24, 7:30 AM CST | Mesoscale Discussion | SPC | Ashley | 90 min |
| Dec 24, 10:13 AM CST | Mesoscale Discussion | SPC | Ashley, Chicot, Union | 62 min |
| Dec 24, 9:34 AM CST | Mesoscale Discussion | SPC | Ascension, Assumption, East Baton Rouge, East Feliciana, Iberville, Jefferson and 16 more | 56 min |
| Dec 24, 10:37 AM CST | Tornado Watch | SPC | Jefferson, Orleans, Plaquemines, Saint Bernard, Saint Charles, Saint Tammany and 2 more | 7 hr |
| Dec 24, 1:14 PM CST | Mesoscale Discussion | SPC | Jefferson, Orleans, Plaquemines, Saint Bernard, Saint Tammany, Washington | 61 min |
| Dec 23, 11:43 PM CST | Mesoscale Discussion | SPC | Comanche, Cotton, Harmon, Jackson, Kiowa, Tillman | 6 hr |
| Dec 24, 7:25 AM CST | Mesoscale Discussion | SPC | Beckham, Blaine, Caddo, Canadian, Carter, Cleveland and 23 more | 6 hr |
| Dec 24, 11:23 AM CST | Mesoscale Discussion | SPC | Atoka, Bryan, Cherokee, Choctaw, Coal, Craig and 26 more | 6 hr |
Nearby
Mesoscale Discussions in Texas, 2009Mesoscale Discussions in Arkansas, 2009Mesoscale Discussions in Louisiana, 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.