Alert archive / Tennessee / Freeze Warnings in 2018

Freeze Warning 8, NWS Memphis, TN

October 21, 20185 counties in Tennessee

NWS Memphis, TN issued this freeze warning at Oct 21, 2018, 2:46 PM CDT for 5 counties in Tennessee. It took effect at Oct 22, 2018, 3:00 AM CDT. It was in force for 6 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Oct 21, 2018, 2:46 PM CDT (19:46 UTC)
In effect from: Oct 22, 2018, 3:00 AM CDT
Expired: Oct 22, 2018, 8:59 AM CDT
In force: 6 hr
Issued by: NWS Memphis, TN

Counties Benton County, TN, Carroll County, TN, Decatur County, TN, Henderson County, TN, Henry County, TN

The radar

The Ft Campbell radar (KHPX), 126 km from the middle of the area, began a volume at 19:43 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 12:00Z, 7.8 hours before the alert went out and 151 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: 1075 m above ground
0-6 km bulk shear: 46 kt
0-1 km storm-relative helicity: -176 m²/s²
0-3 km storm-relative helicity: -69 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 freeze warning 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 freeze warning went out at Oct 20, 6:34 PM CDT, 20 hours 12 minutes earlier.

Area forecast discussion, Oct 20, 6:34 PM CDT, 20 hours 12 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Oct 21, 3:22 AM CDT	Frost Advisory	MEG	Benton, Carroll, Chester, Crockett, Decatur, Dyer and 15 more	30 hr

Nearby

Freeze Warnings in Tennessee, 2018 Every freeze warning in 2018

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.