Alert archive / Florida / Mesoscale Discussions in 2017
Mesoscale Discussion 156
The Storm Prediction Center issued this mesoscale discussion at Feb 7, 2017, 6:58 PM EST for 11 counties in Florida; 7 counties in Georgia. It was in force for 3 hr.
The area
The outline as issued.
The facts
- Issued
- Feb 7, 2017, 6:58 PM EST (23:58 UTC)
- Expired
- Feb 7, 2017, 9:30 PM EST
- In force
- 3 hr
- Issued by
- the Storm Prediction Center
- Chance of a watch
- 40%
Counties Alachua County, FL, Baker County, FL, Bradford County, FL, Clay County, FL, Columbia County, FL, Duval County, FL, Gilchrist County, FL, Marion County, FL, Nassau County, FL, Putnam County, FL, Union County, FL, Brantley County, GA, Camden County, GA, Charlton County, GA, Glynn County, GA, Pierce County, GA, Ware County, GA, Wayne County, GA
The radar
The Jacksonville radar (KJAX), 74 km from the middle of the area, began a volume at 00:03 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
Jacksonville, FL (KJAX), launched 12:00Z, 12.0 hours before the alert went out and 75 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
- 13 J/kg
- Mixed-layer CIN
- -152 J/kg
- Mixed-layer LCL
- 1028 m above ground
- 0-6 km bulk shear
- 28 kt
- 0-1 km storm-relative helicity
- 58 m²/s²
- 0-3 km storm-relative helicity
- 95 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
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 |
|---|---|---|---|---|
| Feb 7, 12:20 PM EST | Mesoscale Discussion | SPC | Escambia, Holmes, Okaloosa, Santa Rosa, Walton, Washington | 115 min |
| Feb 7, 12:50 PM EST | Tornado Watch | SPC | Escambia, Okaloosa, Santa Rosa | 6 hr |
| Feb 7, 3:44 PM EST | Mesoscale Discussion | SPC | Bay, Calhoun, Escambia, Gadsden, Gulf, Holmes and 9 more | 91 min |
| Feb 7, 4:27 PM EST | Severe Thunderstorm Watch | SPC | Bay, Calhoun, Gulf, Holmes, Jackson, Walton and 1 more | 3 hr |
| Feb 7, 5:33 PM EST | Severe Thunderstorm Watch | SPC | Dixie, Franklin, Gadsden, Jefferson, Lafayette, Leon and 4 more | 4 hr |
| Feb 7, 6:24 PM EST | Mesoscale Discussion | SPC | Calhoun, Gadsden, Jefferson, Leon, Liberty, Madison and 2 more | 96 min |
| Feb 7, 5:25 PM EST | Mesoscale Discussion | SPC | Baldwin, Bibb, Bleckley, Butts, Crawford, Dodge and 23 more | 2 hr |
Nearby
Mesoscale Discussions in Florida, 2017Mesoscale Discussions in Georgia, 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.