Alert archive / Tennessee / Mesoscale Discussions in 2015

Mesoscale Discussion 1401

July 13, 201516 counties in Tennessee

The Storm Prediction Center issued this mesoscale discussion at Jul 13, 2015, 7:38 PM CDT for 16 counties in Tennessee. It was in force for 97 min.

The area

The outline as issued.

The facts

Issued: Jul 13, 2015, 7:38 PM CDT (00:38 UTC)
Expired: Jul 13, 2015, 9:15 PM CDT
In force: 97 min
Issued by: the Storm Prediction Center

Counties Bledsoe County, TN, Clay County, TN, Cumberland County, TN, Fentress County, TN, Grundy County, TN, Hamilton County, TN, Jackson County, TN, McMinn County, TN, Meigs County, TN, Overton County, TN, Pickett County, TN, Putnam County, TN, Rhea County, TN, Sequatchie County, TN, Van Buren County, TN, White County, TN

The radar

The Nashville radar (KOHX), 119 km from the middle of the area, began a volume at 00:40 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 00:00Z, 0.6 hours before the alert went out and 119 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: 1428 J/kg
Mixed-layer CIN: -30 J/kg
Mixed-layer LCL: 1559 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: 17 m²/s²
0-3 km storm-relative helicity: 105 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 4.9

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 14, 5:35 AM CDT	Mesoscale Discussion	SPC	Anderson, Campbell, Claiborne, Grainger, Hamblen, Hancock and 4 more	55 min
Jul 14, 12:13 PM CDT	Severe Thunderstorm Watch	SPC	Benton, Carroll, Chester, Crockett, Decatur, Dyer and 15 more	7 hr
Jul 14, 12:14 PM CDT	Mesoscale Discussion	SPC	Anderson, Bedford, Bledsoe, Blount, Bradley, Campbell and 51 more	91 min
Jul 14, 1:46 PM CDT	Severe Thunderstorm Watch	SPC	Anderson, Bedford, Bledsoe, Blount, Bradley, Campbell and 60 more	7 hr
Jul 14, 2:41 PM CDT	Mesoscale Discussion	SPC	Anderson, Bedford, Benton, Bledsoe, Blount, Bradley and 81 more	94 min
Jul 14, 3:55 PM CDT	Mesoscale Discussion	SPC	Bradley, Fayette, Franklin, Giles, Hamilton, Hardeman and 8 more	65 min
Jul 14, 5:24 PM CDT	Mesoscale Discussion	SPC	Anderson, Bedford, Benton, Bledsoe, Blount, Bradley and 58 more	2 hr

Nearby

Mesoscale Discussions in Tennessee, 2015 Every mesoscale discussion in 2015

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.