Alert archive / Tennessee / Mesoscale Discussions in 2018
Mesoscale Discussion 906
The Storm Prediction Center issued this mesoscale discussion at Jun 27, 2018, 2:29 PM EDT for 5 states. It was in force for 3 hr.
The area
The outline as issued.
The facts
- Issued
- Jun 27, 2018, 2:29 PM EDT (18:29 UTC)
- Expired
- Jun 27, 2018, 5:00 PM EDT
- In force
- 3 hr
- Issued by
- the Storm Prediction Center
- Chance of a watch
- 40%
All 103 counties
Banks County, GA, Catoosa County, GA, Fannin County, GA, Franklin County, GA, Gilmer County, GA, Habersham County, GA, Hart County, GA, Lumpkin County, GA, Murray County, GA, Rabun County, GA, Stephens County, GA, Towns County, GA, Union County, GA, White County, GA, Whitfield County, GA, Allen County, KY, Barren County, KY, Clinton County, KY, Cumberland County, KY, Edmonson County, KY, Metcalfe County, KY, Monroe County, KY, Simpson County, KY, Warren County, KY, Buncombe County, NC, Burke County, NC, Cabarrus County, NC, Catawba County, NC, Cherokee County, NC, Clay County, NC, Cleveland County, NC, Gaston County, NC, Graham County, NC, Haywood County, NC, Henderson County, NC, Iredell County, NC, Jackson County, NC, Lincoln County, NC, Macon County, NC, Madison County, NC, McDowell County, NC, Mecklenburg County, NC, Polk County, NC, Rowan County, NC, Rutherford County, NC, Stanly County, NC, Swain County, NC, Transylvania County, NC, Union County, NC, Abbeville County, SC, Anderson County, SC, Cherokee County, SC, Chester County, SC, Fairfield County, SC, Greenville County, SC, Lancaster County, SC, Laurens County, SC, Newberry County, SC, Oconee County, SC, Pickens County, SC, Spartanburg County, SC, Union County, SC, York County, SC, Anderson County, TN, Bledsoe County, TN, Blount County, TN, Bradley County, TN, Cannon County, TN, Clay County, TN, Cocke County, TN, Coffee County, TN, Cumberland County, TN, DeKalb County, TN, Fentress County, TN, Grundy County, TN, Hamilton County, TN, Jackson County, TN, Jefferson County, TN, Knox County, TN, Loudon County, TN, Macon County, TN, Marion County, TN, McMinn County, TN, Meigs County, TN, Monroe County, TN, Morgan County, TN, Overton County, TN, Pickett County, TN, Polk County, TN, Putnam County, TN, Rhea County, TN, Roane County, TN, Rutherford County, TN, Scott County, TN, Sequatchie County, TN, Sevier County, TN, Smith County, TN, Sumner County, TN, Trousdale County, TN, Van Buren County, TN, Warren County, TN, White County, TN, Wilson County, TN
The radar
The Knoxville radar (KMRX), 68 km from the middle of the area, began a volume at 18:33 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 watches that followed
Watches SPC issued over any of the same counties within four hours of this discussion.
The nearest sounding before it
Peachtre/Fal Fld, GA (KFFC), launched 12:00Z, 6.5 hours before the alert went out and 270 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.
- Mixed-layer CAPE
- 440 J/kg
- Mixed-layer CIN
- -104 J/kg
- Mixed-layer LCL
- 883 m above ground
- 0-6 km bulk shear
- 15 kt
- 0-1 km storm-relative helicity
- 82 m²/s²
- 0-3 km storm-relative helicity
- 115 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.6
The text
As transmitted.
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</html>SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 27, 3:36 PM EDT | Severe Thunderstorm Watch | SPC | Columbia, Elbert, Franklin, Habersham, Hart, Lincoln and 4 more | 5 hr |
| Jun 27, 5:55 PM EDT | Mesoscale Discussion | SPC | Columbia, Elbert, Lincoln, McDuffie, Richmond, Wilkes | 2 hr |
| Jun 27, 6:24 PM EDT | Mesoscale Discussion | SPC | Baldwin, Banks, Barrow, Bibb, Butts, Carroll and 41 more | 2 hr |
| Jun 26, 8:41 PM EDT | Mesoscale Discussion | SPC | Ballard, Breckinridge, Butler, Caldwell, Calloway, Carlisle and 25 more | 2 hr |
| Jun 26, 11:06 PM EDT | Mesoscale Discussion | SPC | Butler, Logan, Todd | 84 min |
| Jun 27, 2:42 PM EDT | Mesoscale Discussion | SPC | Ballard, Calloway, Carlisle, Fulton, Graves, Hickman and 4 more | 93 min |
Nearby
Mesoscale Discussions in Tennessee, 2018Mesoscale Discussions in North Carolina, 2018Mesoscale Discussions in Georgia, 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.