Alert archive / Tennessee / Severe Thunderstorm Warnings in 2019

Severe Thunderstorm Warning 17, NWS Nashville, TN

April 8, 2019Grundy County, Tennessee

NWS Nashville, TN issued this severe thunderstorm warning at Apr 8, 2019, 8:13 AM CDT for Grundy County, Tennessee. It was in force for 16 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: Apr 8, 2019, 8:13 AM CDT (13:13 UTC)
Expired: Apr 8, 2019, 8:29 AM CDT
In force: 16 min
Issued by: NWS Nashville, TN
Area: Storm-based polygon
Hail: 0.75 in
Wind: 70.0 mph

County Grundy County, TN

The radar

The Northeast Alabama radar (KHTX), 61 km from the middle of the area, began a volume at 13:14 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

Birmingham, AL (KBMX), launched 12:00Z, 1.2 hours before the alert went out and 264 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: 153 J/kg
Mixed-layer CIN: -90 J/kg
Mixed-layer LCL: 1012 m above ground
0-6 km bulk shear: 35 kt
0-1 km storm-relative helicity: 140 m²/s²
0-3 km storm-relative helicity: 204 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.3

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 Apr 7, 6:26 PM CDT, 13 hours 47 minutes earlier.

Area forecast discussion, Apr 7, 6:26 PM CDT, 13 hours 47 minutes before

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Hazardous weather outlook, Apr 7, 8:24 AM CDT, 23 hours 49 minutes before

Hazardous Weather Outlook
National Weather Service Nashville TN
824 AM CDT Sun Apr 7 2019

TNZ005>011-023>034-056>066-075-077>080-093>095-081330-
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-
824 AM CDT Sun Apr 7 2019

This Hazardous Weather Outlook is for portions of middle
Tennessee.

.DAY ONE...Today and Tonight

A few severe thunderstorms may occur across Middle Tennessee this
afternoon and evening. Damaging winds will be the main concern.

.DAYS TWO THROUGH SEVEN...Monday through Saturday

Showers and thunderstorms will create some locally heavy downpours
through Monday. Localized flooding may occur.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may be needed this afternoon and evening.

13

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 8, 7:49 AM CDT	Severe Thunderstorm Warning	OHX	Grundy	26 min
Apr 8, 9:10 AM CDT	Special Weather Statement	OHX	Cumberland	50 min

Nearby

Severe Thunderstorm Warnings in Tennessee, 2019 Every severe thunderstorm warning in 2019

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.