Alert archive / Tennessee / Dense Fog Advisories in 2021

Dense Fog Advisory 2, NWS Morristown, TN

June 4, 202133 counties in Tennessee; 7 counties in Virginia; Cherokee County, Clay County, North Carolina

NWS Morristown, TN issued this dense fog advisory at Jun 4, 2021, 5:19 AM EDT for 33 counties in Tennessee; 7 counties in Virginia; Cherokee County, Clay County, North Carolina. It was in force for 5 hr.

The area

The counties it named.

The facts

Issued: Jun 4, 2021, 5:19 AM EDT (09:19 UTC)
Expired: Jun 4, 2021, 10:00 AM EDT
In force: 5 hr
Issued by: NWS Morristown, TN

All 42 counties

Cherokee County, NC, Clay County, NC, Anderson County, TN, Bledsoe County, TN, Blount County, TN, Bradley County, TN, Campbell County, TN, Carter County, TN, Claiborne County, TN, Cocke County, TN, Grainger County, TN, Greene County, TN, Hamblen County, TN, Hamilton County, TN, Hancock County, TN, Hawkins County, TN, Jefferson County, TN, Johnson County, TN, Knox County, TN, Loudon County, TN, Marion County, TN, McMinn County, TN, Meigs County, TN, Monroe County, TN, Morgan County, TN, Polk County, TN, Rhea County, TN, Roane County, TN, Scott County, TN, Sequatchie County, TN, Sevier County, TN, Sullivan County, TN, Unicoi County, TN, Union County, TN, Washington County, TN, City of Bristol, VA, City of Norton, VA, Lee County, VA, Russell County, VA, Scott County, VA, Washington County, VA, Wise County, VA

The radar

The Knoxville radar (KMRX), 27 km from the middle of the area, began a volume at 09:21 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

Nashville Metro, TN (KBNA), launched 00:00Z, 9.3 hours before the alert went out and 265 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: 187 J/kg
Mixed-layer CIN: -24 J/kg
Mixed-layer LCL: 1411 m above ground
0-6 km bulk shear: 48 kt
0-1 km storm-relative helicity: -5 m²/s²
0-3 km storm-relative helicity: 28 m²/s²
Significant tornado parameter: -0.0
Supercell composite: -0.0

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 Morristown, TN wrote its last area forecast discussion before this dense fog advisory went out at Jun 4, 3:15 AM EDT, 2 hours 4 minutes earlier.

Area forecast discussion, Jun 4, 3:15 AM EDT, 2 hours 4 minutes before

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Hazardous weather outlook, Jun 4, 3:03 AM EDT, 2 hours 16 minutes before

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In the hours before

Special weather statement, Jun 4, 3:12 AM EDT, 2 hours 7 minutes before

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      <div class="status" id="status">Temporary Notice</div>
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The office that day

Everything else NWS Morristown, TN issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 3, 9:49 PM EDT	Special Weather Statement	MRX	Claiborne	41 min

Nearby

Dense Fog Advisories in Tennessee, 2021 Dense Fog Advisories in Virginia, 2021 Dense Fog Advisories in North Carolina, 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.