Alert archive / Tennessee / Mesoscale Discussions in 2018

Mesoscale Discussion 148

March 19, 201814 counties in Tennessee

The Storm Prediction Center issued this mesoscale discussion at Mar 19, 2018, 6:22 PM CDT for 14 counties in Tennessee. It was in force for 83 min.

The area

The outline as issued.

The facts

Issued
Mar 19, 2018, 6:22 PM CDT (23:22 UTC)
Expired
Mar 19, 2018, 7:45 PM CDT
In force
83 min
Issued by
the Storm Prediction Center

Counties Cannon County, TN, Davidson County, TN, DeKalb County, TN, Jackson County, TN, Macon County, TN, Putnam County, TN, Rutherford County, TN, Smith County, TN, Sumner County, TN, Trousdale County, TN, Warren County, TN, White County, TN, Williamson County, TN, Wilson County, TN

The radar

The Nashville radar (KOHX), 36 km from the middle of the area, began a volume at 23:23 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, 11.4 hours before the alert went out and 36 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-pSkew-T log-p diagram, Nashville Metro, TN at 12:00Z on 2018-03-19Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Nashville Metro, TN at 12:00Z on 2018-03-19The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 113 square meters per square second.1939587897117Sfc1 km3 km6 km9 kmRMLM
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
1252 m above ground
0-6 km bulk shear
45 kt
0-1 km storm-relative helicity
113 m²/s²
0-3 km storm-relative helicity
231 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

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SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Mar 19, 2:06 PM CDTMesoscale DiscussionSPCFranklin, Giles, Hardin, Lawrence, Lincoln, McNairy and 3 more84 min
Mar 19, 3:28 PM CDTTornado Watch PDSSPCBedford, Coffee, Franklin, Giles, Grundy, Hardin and 8 more9 hr
Mar 19, 3:40 PM CDTTornado WatchSPCCannon, Cheatham, Davidson, DeKalb, Dickson, Hickman and 14 more5 hr

Nearby

Mesoscale Discussions in Tennessee, 2018Every mesoscale discussion 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.