Alert archive / Texas / Mesoscale Discussions in 2017
Mesoscale Discussion 1590
The Storm Prediction Center issued this mesoscale discussion at Aug 27, 2017, 9:50 PM CDT for 5 parishes in Louisiana; 8 counties in Texas. It was in force for 115 min.
The area
The outline as issued.
The facts
- Issued
- Aug 27, 2017, 9:50 PM CDT (02:50 UTC)
- Expired
- Aug 27, 2017, 11:45 PM CDT
- In force
- 115 min
- Issued by
- the Storm Prediction Center
Counties Acadia Parish, LA, Calcasieu Parish, LA, Cameron Parish, LA, Jefferson Davis Parish, LA, Vermilion Parish, LA, Brazoria County, TX, Chambers County, TX, Fort Bend County, TX, Galveston County, TX, Harris County, TX, Jefferson County, TX, Liberty County, TX, Orange County, TX
The radar
The Houston radar (KHGX), 64 km from the middle of the area, began a volume at 02:51 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
Lake Charles Mun, LA (KLCH), launched 00:00Z, 2.8 hours before the alert went out and 150 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
- 311 J/kg
- Mixed-layer CIN
- -31 J/kg
- Mixed-layer LCL
- 714 m above ground
- 0-6 km bulk shear
- 36 kt
- 0-1 km storm-relative helicity
- 148 m²/s²
- 0-3 km storm-relative helicity
- 253 m²/s²
- Significant tornado parameter
- 0.2
- Supercell composite
- 1.4
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 |
|---|---|---|---|---|
| Aug 28, 1:51 AM CDT | Tornado Watch | SPC | Acadia, Calcasieu, Cameron, Iberia, Jefferson Davis, Vermilion | 10 hr |
| Aug 28, 11:37 AM CDT | Mesoscale Discussion | SPC | Acadia, Ascension, Assumption, Calcasieu, Cameron, Iberia and 13 more | 83 min |
| Aug 28, 12:16 PM CDT | Tornado Watch | SPC | Acadia, Ascension, Assumption, Calcasieu, Cameron, East Baton Rouge and 20 more | 12 hr |
| Aug 28, 3:58 PM CDT | Mesoscale Discussion | SPC | Acadia, Calcasieu, Cameron, Iberia, Jefferson Davis, Lafayette and 3 more | 92 min |
| Aug 28, 6:49 PM CDT | Mesoscale Discussion | SPC | Acadia, Ascension, Assumption, Calcasieu, Cameron, Iberia and 16 more | 116 min |
| Aug 27, 7:45 PM CDT | Mesoscale Discussion | SPC | Carson, Dallam, Hansford, Hartley, Hutchinson, Moore and 3 more | 2 hr |
| Aug 28, 3:00 AM CDT | Mesoscale Discussion | SPC | Jefferson | 60 min |
Nearby
Mesoscale Discussions in Texas, 2017Mesoscale Discussions in Louisiana, 2017Every mesoscale discussion in 2017
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.