Alert archive / Georgia / Dense Fog Advisories in 2021

Dense Fog Advisory 1, NWS Tallahassee, FL

February 9, 202116 counties in Florida; 26 counties in Georgia; 5 counties in Alabama

NWS Tallahassee, FL issued this dense fog advisory at Feb 9, 2021, 5:21 PM CST for 16 counties in Florida; 26 counties in Georgia; 5 counties in Alabama. It was in force for 17 hr.

The area

The counties it named.

The facts

Issued: Feb 9, 2021, 5:21 PM CST (23:21 UTC)
Expired: Feb 10, 2021, 10:00 AM CST
In force: 17 hr
Issued by: NWS Tallahassee, FL

All 47 counties

Coffee County, AL, Dale County, AL, Geneva County, AL, Henry County, AL, Houston County, AL, Bay County, FL, Calhoun County, FL, Dixie County, FL, Franklin County, FL, Gadsden County, FL, Gulf County, FL, Holmes County, FL, Jackson County, FL, Jefferson County, FL, Lafayette County, FL, Leon County, FL, Madison County, FL, Taylor County, FL, Wakulla County, FL, Walton County, FL, Washington County, FL, Baker County, GA, Ben Hill County, GA, Berrien County, GA, Brooks County, GA, Calhoun County, GA, Clay County, GA, Colquitt County, GA, Cook County, GA, Decatur County, GA, Dougherty County, GA, Early County, GA, Grady County, GA, Irwin County, GA, Lanier County, GA, Lee County, GA, Lowndes County, GA, Miller County, GA, Mitchell County, GA, Quitman County, GA, Randolph County, GA, Seminole County, GA, Terrell County, GA, Thomas County, GA, Tift County, GA, Turner County, GA, Worth County, GA

The radar

The Tallahassee radar (KTLH), 66 km from the middle of the area, began a volume at 23:22 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

Tallahassee Rgnl, FL (KTLH), launched 12:00Z, 11.4 hours before the alert went out and 66 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 59 J/kg
Mixed-layer CIN: -183 J/kg
Mixed-layer LCL: 488 m above ground
0-6 km bulk shear: 70 kt
0-1 km storm-relative helicity: 55 m²/s²
0-3 km storm-relative helicity: 248 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -1.1

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this dense fog advisory went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Tallahassee, FL wrote its last area forecast discussion before this dense fog advisory went out at Feb 9, 2:11 PM CST, 3 hours 10 minutes earlier.

Area forecast discussion, Feb 9, 2:11 PM CST, 3 hours 10 minutes before

<!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>

In the hours before

Local storm report, Feb 9, 11:21 AM CST, 6 hours before

<!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>

Local storm report, Feb 9, 1:36 PM CST, 3 hours 45 minutes before

<!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>

The office that day

Everything else NWS Tallahassee, FL issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Feb 9, 5:46 AM CST	Special Weather Statement	TAE	Holmes, Walton	44 min
Feb 9, 6:31 AM CST	Special Weather Statement	TAE	Holmes, Jackson, Walton, Washington	44 min
Feb 9, 6:43 AM CST	Special Marine Warning	TAE		2 hr
Feb 9, 7:28 AM CST	Severe Thunderstorm Warning	TAE	Jackson	47 min
Feb 9, 8:17 AM CST	Special Weather Statement	TAE	Bay, Calhoun	43 min
Feb 9, 8:41 AM CST	Special Marine Warning	TAE		2 hr
Feb 9, 9:01 AM CST	Special Weather Statement	TAE	Liberty	44 min
Feb 9, 9:25 AM CST	Special Weather Statement	TAE	Gadsden	50 min
Feb 9, 9:43 AM CST	Special Weather Statement	TAE	Leon, Liberty, Wakulla	62 min
Feb 9, 2:21 PM CST	Marine Dense Fog Advisory	TAE		3 days
Feb 9, 7:12 AM CST	Special Weather Statement	TAE	Decatur, Miller, Seminole	48 min
Feb 9, 7:35 AM CST	Special Weather Statement	TAE	Berrien, Irwin, Tift	40 min
Feb 9, 8:10 AM CST	Special Weather Statement	TAE	Decatur, Grady	50 min
Feb 9, 1:16 AM CST	Special Weather Statement	TAE	Geneva	29 min
Feb 9, 4:14 AM CST	Special Weather Statement	TAE	Houston	31 min

Nearby

Dense Fog Advisories in Georgia, 2021 Dense Fog Advisories in Florida, 2021 Dense Fog Advisories in Alabama, 2021 Every dense fog advisory in 2021

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.