Alert archive / Texas / Mesoscale Discussions in 2020
Mesoscale Discussion 197
The Storm Prediction Center issued this mesoscale discussion at Mar 18, 2020, 8:45 PM CDT for 24 counties in Texas. It was in force for 60 min.
The area
The outline as issued.
The facts
- Issued
- Mar 18, 2020, 8:45 PM CDT (01:45 UTC)
- Expired
- Mar 18, 2020, 9:45 PM CDT
- In force
- 60 min
- Issued by
- the Storm Prediction Center
- Chance of a watch
- 80%
All 24 counties
Bandera County, TX, Coke County, TX, Concho County, TX, Crockett County, TX, Edwards County, TX, Irion County, TX, Kerr County, TX, Kimble County, TX, Kinney County, TX, Mason County, TX, Maverick County, TX, McCulloch County, TX, Menard County, TX, Reagan County, TX, Real County, TX, Runnels County, TX, Schleicher County, TX, Sterling County, TX, Sutton County, TX, Terrell County, TX, Tom Green County, TX, Uvalde County, TX, Val Verde County, TX, Zavala County, TX
The radar
The Laughlin AFB radar (KDFX), 133 km from the middle of the area, began a volume at 01:49 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
Del Rio, TX (KDRT), launched 00:00Z, 1.8 hours before the alert went out and 97 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
- 487 J/kg
- Mixed-layer CIN
- -195 J/kg
- Mixed-layer LCL
- 1608 m above ground
- 0-6 km bulk shear
- 64 kt
- 0-1 km storm-relative helicity
- 172 m²/s²
- 0-3 km storm-relative helicity
- 381 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 3.0
The text
As transmitted.
<!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 18, 9:34 PM CDT | Mesoscale Discussion | SPC | Cooke, Grayson, Wise | 56 min |
| Mar 18, 11:37 PM CDT | Tornado Watch | SPC | Brown, Callahan, Coke, Coleman, Comanche, Concho and 34 more | 5 hr |
| Mar 19, 1:28 AM CDT | Mesoscale Discussion | SPC | Brown, Callahan, Coke, Coleman, Comanche, Concho and 23 more | 2 hr |
| Mar 19, 2:08 AM CDT | Mesoscale Discussion | SPC | Shackelford, Stephens | 67 min |
| Mar 19, 3:33 AM CDT | Mesoscale Discussion | SPC | Bandera, Brown, Callahan, Coleman, Comanche, Concho and 24 more | 117 min |
| Mar 19, 1:58 PM CDT | Mesoscale Discussion | SPC | Bosque, Bowie, Camp, Collin, Dallas, Delta and 26 more | 62 min |
| Mar 19, 2:24 PM CDT | Tornado Watch | SPC | Bowie, Camp, Cass, Collin, Delta, Fannin and 18 more | 8 hr |
| Mar 19, 6:51 PM CDT | Mesoscale Discussion | SPC | Bell, Bosque, Coryell, Falls, Freestone, Hamilton and 9 more | 54 min |
Nearby
Mesoscale Discussions in Texas, 2020Every mesoscale discussion in 2020
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.