Alert archive / Tennessee / Dense Fog Advisories in 2021

Dense Fog Advisory 3, NWS Memphis, TN

January 25, 2021DeSoto County, Mississippi; 21 counties in Tennessee; 8 counties in Arkansas

NWS Memphis, TN issued this dense fog advisory at Jan 25, 2021, 7:59 PM CST for DeSoto County, Mississippi; 21 counties in Tennessee; 8 counties in Arkansas. It was in force for 13 hr.

The area

The counties it named.

The facts

Issued: Jan 25, 2021, 7:59 PM CST (01:59 UTC)
Expired: Jan 26, 2021, 9:00 AM CST
In force: 13 hr
Issued by: NWS Memphis, TN

All 30 counties

Clay County, AR, Craighead County, AR, Crittenden County, AR, Cross County, AR, Greene County, AR, Mississippi County, AR, Poinsett County, AR, St. Francis County, AR, DeSoto County, MS, Benton County, TN, Carroll County, TN, Chester County, TN, Crockett County, TN, Decatur County, TN, Dyer County, TN, Fayette County, TN, Gibson County, TN, Hardeman County, TN, Hardin County, TN, Haywood County, TN, Henderson County, TN, Henry County, TN, Lake County, TN, Lauderdale County, TN, Madison County, TN, McNairy County, TN, Obion County, TN, Shelby County, TN, Tipton County, TN, Weakley County, TN

The radar

The Memphis radar (KNQA), 58 km from the middle of the area, began a volume at 02:00 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, 2.0 hours before the alert went out and 256 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 548 m above ground
0-6 km bulk shear: 66 kt
0-1 km storm-relative helicity: 654 m²/s²
0-3 km storm-relative helicity: 735 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.2

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 Memphis, TN wrote its last area forecast discussion before this dense fog advisory went out at Jan 25, 7:56 PM CST, 3 minutes earlier.

Area forecast discussion, Jan 25, 7:56 PM CST, 3 minutes before

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Hazardous weather outlook, Jan 25, 6:10 PM CST, 1 hour 49 minutes before

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In the hours before

Local storm report, Jan 25, 3:53 PM CST, 4 hours 6 minutes before

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Local storm report, Jan 25, 4:28 PM CST, 3 hours 31 minutes before

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Local storm report, Jan 25, 4:30 PM CST, 3 hours 29 minutes before

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Local storm report, Jan 25, 5:20 PM CST, 2 hours 39 minutes before

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Local storm report, Jan 25, 5:22 PM CST, 2 hours 37 minutes before

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Local storm report, Jan 25, 5:27 PM CST, 2 hours 32 minutes before

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Nearby

Dense Fog Advisories in Tennessee, 2021 Dense Fog Advisories in Arkansas, 2021 Dense Fog Advisories in Mississippi, 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.