Alert archive / Tennessee / Freeze Warnings in 2018

Freeze Warning 4, NWS Memphis, TN

April 4, 201820 counties in Tennessee; 15 counties in Mississippi; 6 counties in Arkansas

NWS Memphis, TN issued this freeze warning at Apr 4, 2018, 3:44 AM CDT for 20 counties in Tennessee; 15 counties in Mississippi; 6 counties in Arkansas. It took effect at Apr 5, 2018, 1:00 AM CDT. It was in force for 7 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: Apr 4, 2018, 3:44 AM CDT (08:44 UTC)
In effect from: Apr 5, 2018, 1:00 AM CDT
Expired: Apr 5, 2018, 8:22 AM CDT
In force: 7 hr
Issued by: NWS Memphis, TN

All 41 counties

Clay County, AR, Craighead County, AR, Greene County, AR, Lawrence County, AR, Mississippi County, AR, Randolph County, AR, Alcorn County, MS, Benton County, MS, Calhoun County, MS, Chickasaw County, MS, Itawamba County, MS, Lafayette County, MS, Lee County, MS, Marshall County, MS, Monroe County, MS, Pontotoc County, MS, Prentiss County, MS, Tippah County, MS, Tishomingo County, MS, Union County, MS, Yalobusha 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, Tipton County, TN, Weakley County, TN

The radar

The Memphis radar (KNQA), 66 km from the middle of the area, began a volume at 08:48 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

Little Rock, AR (KBYH), launched 00:00Z, 8.7 hours before the alert went out and 90 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: 837 m above ground
0-6 km bulk shear: 57 kt
0-1 km storm-relative helicity: -148 m²/s²
0-3 km storm-relative helicity: -8 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 Apr 3, 11:24 PM CDT, 4 hours 20 minutes earlier.

Area forecast discussion, Apr 3, 11:24 PM CDT, 4 hours 20 minutes before

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Hazardous weather outlook, Apr 3, 9:56 PM CDT, 5 hours 48 minutes before

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In the hours before

Local storm report, Apr 3, 10:08 PM CDT, 5 hours 36 minutes before

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Local storm report, Apr 3, 10:21 PM CDT, 5 hours 23 minutes before

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Local storm report, Apr 3, 10:31 PM CDT, 5 hours 13 minutes before

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Local storm report, Apr 3, 10:40 PM CDT, 5 hours 4 minutes before

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Local storm report, Apr 3, 11:12 PM CDT, 4 hours 32 minutes before

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Local storm report, Apr 3, 11:13 PM CDT, 4 hours 31 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
Apr 3, 7:30 PM CDT	Severe Thunderstorm Warning	MEG	Crockett, Dyer, Gibson, Haywood, Lauderdale, Madison	10 min
Apr 3, 8:37 PM CDT	Severe Thunderstorm Warning	MEG	Benton, Carroll, Decatur, Henderson	23 min
Apr 4, 5:23 PM CDT	Frost Advisory	MEG	Shelby	15 hr
Apr 3, 7:06 PM CDT	Severe Thunderstorm Warning	MEG	DeSoto, Tate, Tunica	39 min
Apr 3, 7:31 PM CDT	Special Weather Statement	MEG	Marshall	29 min
Apr 3, 8:05 PM CDT	Special Weather Statement	MEG	Pontotoc, Union	25 min
Apr 3, 8:16 PM CDT	Severe Thunderstorm Warning	MEG	Itawamba, Lafayette, Lee, Pontotoc, Union	44 min
Apr 3, 8:21 PM CDT	Special Weather Statement	MEG	Calhoun, Chickasaw	24 min
Apr 3, 8:26 PM CDT	Severe Thunderstorm Warning	MEG	Itawamba, Lee, Monroe, Pontotoc, Prentiss, Tippah and 2 more	49 min
Apr 3, 8:50 PM CDT	Severe Thunderstorm Warning	MEG	Calhoun, Chickasaw, Itawamba, Lee, Monroe, Pontotoc	40 min
Apr 3, 8:54 PM CDT	Special Weather Statement	MEG	Tishomingo	51 min
Apr 3, 9:29 PM CDT	Severe Thunderstorm Warning	MEG	Monroe	31 min

Nearby

Freeze Warnings in Tennessee, 2018 Freeze Warnings in Mississippi, 2018 Freeze Warnings in Arkansas, 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.