Alert archive / Texas / Mesoscale Discussions in 2009
Mesoscale Discussion 2138
The Storm Prediction Center issued this mesoscale discussion at Oct 25, 2009, 11:40 PM CDT for 4 counties in Arkansas; 4 counties in Oklahoma; 55 counties in Texas. It was in force for 95 min.
The area
The outline as issued.
The facts
- Issued
- Oct 25, 2009, 11:40 PM CDT (04:40 UTC)
- Expired
- Oct 26, 2009, 1:15 AM CDT
- In force
- 95 min
- Issued by
- the Storm Prediction Center
All 63 counties
Howard County, AR, Little River County, AR, Polk County, AR, Sevier County, AR, Choctaw County, OK, LeFlore County, OK, McCurtain County, OK, Pushmataha County, OK, Anderson County, TX, Bandera County, TX, Bell County, TX, Blanco County, TX, Bosque County, TX, Bowie County, TX, Burnet County, TX, Camp County, TX, Collin County, TX, Comal County, TX, Coryell County, TX, Dallas County, TX, Delta County, TX, Edwards County, TX, Ellis County, TX, Falls County, TX, Fannin County, TX, Franklin County, TX, Freestone County, TX, Gillespie County, TX, Hays County, TX, Henderson County, TX, Hill County, TX, Hopkins County, TX, Hunt County, TX, Kaufman County, TX, Kendall County, TX, Kerr County, TX, Kimble County, TX, Kinney County, TX, Lamar County, TX, Lampasas County, TX, Leon County, TX, Limestone County, TX, Llano County, TX, Mason County, TX, McLennan County, TX, Medina County, TX, Milam County, TX, Morris County, TX, Navarro County, TX, Rains County, TX, Real County, TX, Red River County, TX, Robertson County, TX, Rockwall County, TX, San Saba County, TX, Smith County, TX, Titus County, TX, Travis County, TX, Upshur County, TX, Uvalde County, TX, Van Zandt County, TX, Williamson County, TX, Wood County, TX
The radar
The Ft Hood radar (KGRK), 107 km from the middle of the area, began a volume at 04:40 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, 4.7 hours before the alert went out and 153 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
- 2288 J/kg
- Mixed-layer CIN
- -4 J/kg
- Mixed-layer LCL
- 1025 m above ground
- 0-6 km bulk shear
- 36 kt
- 0-1 km storm-relative helicity
- 95 m²/s²
- 0-3 km storm-relative helicity
- 208 m²/s²
- Significant tornado parameter
- 1.7
- Supercell composite
- 8.4
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 |
|---|---|---|---|---|
| Oct 25, 7:13 PM CDT | Severe Thunderstorm Watch | SPC | Atoka, Bryan, Carter, Choctaw, Coal, Jefferson and 6 more | 6 hr |
| Oct 25, 9:44 PM CDT | Mesoscale Discussion | SPC | Atoka, Bryan, Choctaw, Coal, Johnston, Latimer and 3 more | 91 min |
Nearby
Mesoscale Discussions in Texas, 2009Mesoscale Discussions in Arkansas, 2009Mesoscale Discussions in Oklahoma, 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.