Alert archive / Texas / Mesoscale Discussions in 2015
Mesoscale Discussion 286
The Storm Prediction Center issued this mesoscale discussion at Apr 12, 2015, 5:39 PM CDT for 26 counties in Texas. It was in force for 2 hr.
The area
The outline as issued.
The facts
- Issued
- Apr 12, 2015, 5:39 PM CDT (22:39 UTC)
- Expired
- Apr 12, 2015, 7:45 PM CDT
- In force
- 2 hr
- Issued by
- the Storm Prediction Center
- Chance of a watch
- 80%
All 26 counties
Atascosa County, TX, Bandera County, TX, Bee County, TX, Bexar County, TX, Brooks County, TX, Dimmit County, TX, Duval County, TX, Edwards County, TX, Frio County, TX, Hidalgo County, TX, Jim Hogg County, TX, Jim Wells County, TX, Kinney County, TX, Kleberg County, TX, La Salle County, TX, Live Oak County, TX, Maverick County, TX, McMullen County, TX, Medina County, TX, Real County, TX, Starr County, TX, Uvalde County, TX, Val Verde County, TX, Webb County, TX, Zapata County, TX, Zavala County, TX
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 (KDLF), launched 12:00Z, 10.7 hours before the alert went out and 197 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
- 1227 J/kg
- Mixed-layer CIN
- -10 J/kg
- Mixed-layer LCL
- 596 m above ground
- 0-6 km bulk shear
- 24 kt
- 0-1 km storm-relative helicity
- 34 m²/s²
- 0-3 km storm-relative helicity
- 120 m²/s²
- Significant tornado parameter
- 0.3
- Supercell composite
- 1.9
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 |
|---|---|---|---|---|
| Apr 11, 8:19 PM CDT | Mesoscale Discussion | SPC | Armstrong, Briscoe, Carson, Childress, Collingsworth, Crosby and 13 more | 56 min |
| Apr 12, 5:03 PM CDT | Mesoscale Discussion | SPC | Childress, Collingsworth, Hardeman, Hemphill, Lipscomb, Wheeler | 57 min |
| Apr 12, 5:05 PM CDT | Mesoscale Discussion | SPC | Andrews, Borden, Crane, Crockett, Dawson, Ector and 15 more | 115 min |
| Apr 12, 5:17 PM CDT | Severe Thunderstorm Watch | SPC | Briscoe, Childress, Collingsworth, Cottle, Crosby, Dickens and 16 more | 7 hr |
| Apr 12, 5:59 PM CDT | Severe Thunderstorm Watch | SPC | Atascosa, Bandera, Brooks, Cameron, Crockett, Dimmit and 28 more | 7 hr |
Nearby
Mesoscale Discussions in Texas, 2015Every mesoscale discussion in 2015
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.