Alert archive / Tennessee / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 122, NWS Nashville, TN

June 28, 2020Coffee County, Grundy County, Tennessee

NWS Nashville, TN issued this severe thunderstorm warning at Jun 28, 2020, 6:42 PM CDT for Coffee County, Grundy County, Tennessee. It was in force for 33 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Jun 28, 2020, 6:42 PM CDT (23:42 UTC)
Expired: Jun 28, 2020, 7:15 PM CDT
In force: 33 min
Issued by: NWS Nashville, TN
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Coffee County, TN, Grundy County, TN

The radar

The Northeast Alabama radar (KHTX), 59 km from the middle of the area, began a volume at 23:44 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, 11.7 hours before the alert went out and 99 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: 1324 J/kg
Mixed-layer CIN: -13 J/kg
Mixed-layer LCL: 708 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 180 m²/s²
0-3 km storm-relative helicity: 166 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 4.0

Open this sounding in Storm Lab

What forecasters said that day

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

NWS Nashville, TN wrote its last area forecast discussion before this severe thunderstorm warning went out at Jun 28, 6:29 PM CDT, 13 minutes earlier.

Area forecast discussion, Jun 28, 6:29 PM CDT, 13 minutes before

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Hazardous weather outlook, Jun 28, 5:51 AM CDT, 12 hours 51 minutes before

Hazardous Weather Outlook
National Weather Service Nashville TN
551 AM CDT Sun Jun 28 2020

TNZ005>011-023>034-056>066-075-077>080-093>095-291100-
Stewart-Montgomery-Robertson-Sumner-Macon-Clay-Pickett-Houston-
Humphreys-Dickson-Cheatham-Davidson-Wilson-Trousdale-Smith-Jackson-
Putnam-Overton-Fentress-Perry-Hickman-Lewis-Williamson-Maury-
Marshall-Rutherford-Cannon-De Kalb-White-Cumberland-Bedford-Coffee-
Warren-Grundy-Van Buren-Wayne-Lawrence-Giles-
551 AM CDT Sun Jun 28 2020

This Hazardous Weather Outlook is for portions of Middle Tennessee.

.DAY ONE...Today and Tonight.

A few strong storms are possible today and tonight, especially
across the northeast. Gusty wind is the main threat. Isolated
minor flooding is also possible, also mainly across the northeast.

.DAYS TWO THROUGH SEVEN...Monday through Saturday.

No hazardous weather is expected at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not likely.

07

In the hours before

Special weather statement, Jun 28, 5:04 PM CDT, 1 hour 38 minutes before

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Special weather statement, Jun 28, 5:24 PM CDT, 1 hour 18 minutes before

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Special weather statement, Jun 28, 5:43 PM CDT, 59 minutes before

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Special weather statement, Jun 28, 6:05 PM CDT, 37 minutes before

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Special weather statement, Jun 28, 6:15 PM CDT, 27 minutes before

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Special weather statement, Jun 28, 6:41 PM CDT, 1 minute before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 27, 9:22 PM CDT	Special Weather Statement	OHX	Clay, Jackson, Overton, Pickett	38 min
Jun 27, 9:59 PM CDT	Special Weather Statement	OHX	Fentress, Overton, Pickett	61 min
Jun 28, 12:25 AM CDT	Areal Flood Advisory	OHX	Clay, Fentress, Jackson, Macon, Overton, Pickett	2 hr
Jun 28, 1:44 AM CDT	Flash Flood Warning	OHX	Clay, Jackson, Overton, Pickett	2 hr
Jun 28, 11:50 AM CDT	Special Weather Statement	OHX	Clay	40 min
Jun 28, 12:15 PM CDT	Special Weather Statement	OHX	Pickett	45 min
Jun 28, 12:50 PM CDT	Special Weather Statement	OHX	Fentress	25 min
Jun 28, 1:33 PM CDT	Special Weather Statement	OHX	Macon	42 min
Jun 28, 2:16 PM CDT	Areal Flood Advisory	OHX	Macon, Sumner	4 hr
Jun 28, 2:21 PM CDT	Special Weather Statement	OHX	Smith, Trousdale	39 min
Jun 28, 2:44 PM CDT	Areal Flood Advisory	OHX	Putnam	3 hr
Jun 28, 3:16 PM CDT	Areal Flood Advisory	OHX	Jackson, Macon, Smith, Sumner, Trousdale	4 hr
Jun 28, 3:40 PM CDT	Special Weather Statement	OHX	Robertson	35 min
Jun 28, 3:52 PM CDT	Special Weather Statement	OHX	Trousdale	38 min
Jun 28, 4:26 PM CDT	Areal Flood Advisory	OHX	Robertson, Sumner, Trousdale	3 hr
Jun 28, 4:37 PM CDT	Special Weather Statement	OHX	Robertson	23 min
Jun 28, 5:04 PM CDT	Special Weather Statement	OHX	Robertson	41 min
Jun 28, 5:24 PM CDT	Special Weather Statement	OHX	Van Buren, Warren	36 min
Jun 28, 5:43 PM CDT	Special Weather Statement	OHX	Warren	32 min
Jun 28, 6:05 PM CDT	Special Weather Statement	OHX	Coffee	40 min
Jun 28, 6:15 PM CDT	Special Weather Statement	OHX	Grundy	30 min
Jun 28, 6:41 PM CDT	Special Weather Statement	OHX	Grundy	49 min

Nearby

Severe Thunderstorm Warnings in Tennessee, 2020 Every severe thunderstorm warning in 2020

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.