Alert archive / Tennessee / Severe Thunderstorm Warnings in 2018
Severe Thunderstorm Warning 147, NWS Morristown, TN
NWS Morristown, TN issued this severe thunderstorm warning at Jul 20, 2018, 11:11 PM CDT for 4 counties in Tennessee. It was in force for 49 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
- Jul 20, 2018, 11:11 PM CDT (04:11 UTC)
- Expired
- Jul 21, 2018, 12:00 AM CDT
- In force
- 49 min
- Issued by
- NWS Morristown, TN
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
Counties Bledsoe County, TN, Hamilton County, TN, Rhea County, TN, Sequatchie County, TN
The radar
The Northeast Alabama radar (KHTX), 100 km from the middle of the area, began a volume at 04:12 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 watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Jul 20, 7:02 PM CDT | Tornado Watch | SPC | 7 hr |
The nearest sounding before it
Nashville Metro, TN (KBNA), launched 00:00Z, 4.2 hours before the alert went out and 150 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
- 3305 J/kg
- Mixed-layer CIN
- -1 J/kg
- Mixed-layer LCL
- 1217 m above ground
- 0-6 km bulk shear
- 53 kt
- 0-1 km storm-relative helicity
- 90 m²/s²
- 0-3 km storm-relative helicity
- 169 m²/s²
- Significant tornado parameter
- 2.2
- Supercell composite
- 11.6
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 Morristown, TN wrote its last area forecast discussion before this severe thunderstorm warning went out at Jul 20, 7:38 PM CDT, 3 hours 33 minutes earlier.
Area forecast discussion, Jul 20, 7:38 PM CDT, 3 hours 33 minutes before
Area Forecast Discussion National Weather Service Morristown TN 838 PM EDT Fri Jul 20 2018 .DISCUSSION...Showers and storms currently across southeastern KY and the northern Cumberland Plateau will continue to drift east southeast into the TN Valley this evening. The highest instability values remain across the central TN Valley and westward back toward the Cumberland Plateau. This area of moderate instability combined with 40 to 50 Knots of effective bulk shear will allow storms to maintain their strength as they drop down into our area. Low level shear is lacking right now so expect any rotation to remain confined to the mid levels unless a storm can latch onto a good boundary. Models do show low level shear increasing here in a few hours though, thus allowing for the current tornado watch. Wind damage and large hail will be the main threats with these storms but there is also the possibility of an isolated tornado due to the shear in place. Models still uncertain what happens later tonight after this first wave of storms rolls. However, thinking as of now is this line that is currently moving in will be the main show. New zones issued for tornado watch wording. && .PRELIMINARY POINT TEMPS/POPS... Chattanooga Airport, TN 72 89 70 85 / 60 60 60 50 Knoxville McGhee Tyson Airport, TN 70 85 68 82 / 60 60 60 70 Oak Ridge, TN 70 85 68 82 / 70 60 60 70 Tri Cities Airport, TN 66 82 65 79 / 60 70 70 70 && .MRX WATCHES/WARNINGS/ADVISORIES... NC...None. TN...None. VA...None. && SR
Hazardous weather outlook, Jul 20, 2:21 PM CDT, 8 hours 50 minutes before
Hazardous Weather Outlook National Weather Service Morristown TN 321 PM EDT Fri Jul 20 2018 NCZ060-061-TNZ012>018-035>047-067>074-081>087-098>102-VAZ001-002- 005-006-008-211930- Cherokee-Clay-Scott TN-Campbell-Claiborne-Hancock-Hawkins- Sullivan-Johnson-Morgan-Anderson-Union-Grainger-Hamblen- Northwest Cocke-Cocke Smoky Mountains-Northwest Greene- Southeast Greene-Washington TN-Unicoi-Northwest Carter- Southeast Carter-Roane-Loudon-Knox-Jefferson-NW Blount- Blount Smoky Mountains-North Sevier-Sevier Smoky Mountains- Sequatchie-Bledsoe-Rhea-Meigs-McMinn-Northwest Monroe- Southeast Monroe-Marion-Hamilton-Bradley-West Polk-East Polk-Lee- Wise-Scott-Russell-Washington- 321 PM EDT Fri Jul 20 2018 /221 PM CDT Fri Jul 20 2018/ This Hazardous Weather Outlook is for portions of Southwest North Carolina...East Tennessee and Southwest Virginia. .DAY ONE...This Afternoon and Tonight Showers and thunderstorms are likely tonight across much of the area, some of which may reach severe levels. The strongest storms are expected to move out of Kentucky into middle and east Tennessee late tonight, moving quickly into southeast Tennessee and southwest North Carolina into early morning Saturday. Some of these thunderstorms will be capable of producing damaging winds, large hail, and brief heavy rainfall. An isolated tornado cannot be ruled out, particularly across southern portions of the Tennessee Valley. .DAYS TWO THROUGH SEVEN...Saturday through Thursday The atmosphere will remain unstable into Saturday and strong to severe thunderstorms will again be possible Saturday afternoon into the evening. The main threats with any stronger storms will be damaging winds, large hail and brief heavy rainfall. .SPOTTER INFORMATION STATEMENT... Spotter activation will likely be needed tonight.
In the hours before
Local storm report, Jul 20, 10:25 PM CDT, 46 minutes before
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</html>Local storm report, Jul 20, 11:11 PM CDT, 0 minutes before
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</html>The office that day
Everything else NWS Morristown, TN issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 20, 8:02 PM CDT | Severe Thunderstorm Warning | MRX | Claiborne, Hancock | 58 min |
| Jul 20, 8:12 PM CDT | Severe Thunderstorm Warning | MRX | Campbell, Claiborne, Scott | 48 min |
| Jul 20, 8:42 PM CDT | Severe Thunderstorm Warning | MRX | Grainger, Hamblen, Hawkins | 63 min |
| Jul 20, 8:56 PM CDT | Severe Thunderstorm Warning | MRX | Anderson, Campbell, Claiborne, Union | 49 min |
| Jul 20, 9:10 PM CDT | Severe Thunderstorm Warning | MRX | Cocke, Greene, Jefferson, Sullivan, Unicoi, Washington | 65 min |
| Jul 20, 9:17 PM CDT | Severe Thunderstorm Warning | MRX | Anderson, Blount, Knox, Sevier | 58 min |
| Jul 20, 9:31 PM CDT | Tornado Warning | MRX | Bledsoe, Rhea | 44 min |
| Jul 20, 9:44 PM CDT | Severe Thunderstorm Warning | MRX | Hamblen | 16 min |
| Jul 20, 9:48 PM CDT | Severe Thunderstorm Warning | MRX | Carter, Johnson, Unicoi | 57 min |
| Jul 20, 10:10 PM CDT | Tornado Warning | MRX | Bledsoe, Meigs, Rhea | 50 min |
| Jul 20, 10:13 PM CDT | Severe Thunderstorm Warning | MRX | Cocke, Sevier | 32 min |
| Jul 20, 10:18 PM CDT | Severe Thunderstorm Warning | MRX | Bledsoe, Rhea | 42 min |
| Jul 20, 10:42 PM CDT | Severe Thunderstorm Warning | MRX | Bradley, McMinn, Meigs, Rhea | 48 min |
| Jul 20, 10:47 PM CDT | Areal Flood Advisory | MRX | Bledsoe, Meigs, Rhea, Roane | 3 hr |
| Jul 20, 11:02 PM CDT | Special Weather Statement | MRX | Bledsoe | 43 min |
| Jul 20, 11:14 PM CDT | Special Weather Statement | MRX | Scott | 46 min |
| Jul 20, 11:24 PM CDT | Severe Thunderstorm Warning | MRX | Bradley, McMinn, Meigs, Polk | 51 min |
| Jul 20, 11:55 PM CDT | Severe Thunderstorm Warning | MRX | Bledsoe, Hamilton, Meigs, Rhea | 50 min |
| Jul 20, 11:58 PM CDT | Areal Flood Advisory | MRX | McMinn, Meigs, Rhea | 3 hr |
| Jul 20, 11:58 PM CDT | Severe Thunderstorm Warning | MRX | Polk | 62 min |
| Jul 21, 12:16 AM CDT | Areal Flood Advisory | MRX | Bledsoe, Rhea | 3 hr |
| Jul 21, 12:21 AM CDT | Severe Thunderstorm Warning | MRX | Bledsoe, Rhea | 39 min |
| Jul 21, 12:27 AM CDT | Severe Thunderstorm Warning | MRX | Anderson, Campbell, Claiborne, Scott | 48 min |
| Jul 21, 12:28 AM CDT | Severe Thunderstorm Warning | MRX | Bradley, McMinn | 47 min |
| Jul 21, 1:02 AM CDT | Severe Thunderstorm Warning | MRX | Bradley, Polk | 28 min |
| Jul 21, 1:11 AM CDT | Severe Thunderstorm Warning | MRX | Anderson, Campbell, Morgan, Roane, Scott | 52 min |
| Jul 21, 1:16 AM CDT | Severe Thunderstorm Warning | MRX | Anderson, Campbell, Claiborne, Grainger, Knox, Union | 59 min |
| Jul 21, 1:39 AM CDT | Areal Flood Advisory | MRX | Bradley, McMinn, Polk | 3 hr |
| Jul 21, 1:54 AM CDT | Special Weather Statement | MRX | Blount, Loudon, Roane | 66 min |
| Jul 21, 2:06 AM CDT | Severe Thunderstorm Warning | MRX | Bledsoe, Rhea | 39 min |
| Jul 21, 2:10 AM CDT | Special Weather Statement | MRX | Cocke, Grainger, Hamblen, Jefferson | 50 min |
| Jul 21, 2:30 AM CDT | Severe Thunderstorm Warning | MRX | Bledsoe, Hamilton, Meigs, Rhea | 45 min |
| Jul 21, 2:36 AM CDT | Areal Flood Warning | MRX | Bledsoe, Bradley, Hamilton, McMinn, Meigs, Rhea | 3 hr |
| Jul 21, 2:41 AM CDT | Severe Thunderstorm Warning | MRX | Hamilton, Marion, Sequatchie | 48 min |
| Jul 21, 2:53 AM CDT | Severe Thunderstorm Warning | MRX | McMinn, Monroe | 41 min |
| Jul 21, 3:05 AM CDT | Severe Thunderstorm Warning | MRX | Bradley, Hamilton, McMinn, Polk | 40 min |
| Jul 21, 3:33 AM CDT | Areal Flood Advisory | MRX | Bradley, Hamilton, Marion, Polk | 117 min |
| Jul 21, 5:39 AM CDT | Severe Thunderstorm Warning | MRX | Bledsoe | 36 min |
| Jul 21, 6:05 AM CDT | Severe Thunderstorm Warning | MRX | Bledsoe, Hamilton, Meigs, Rhea | 25 min |
| Jul 21, 6:24 AM CDT | Special Weather Statement | MRX | Bradley, Polk | 36 min |
| Jul 21, 3:06 PM CDT | Special Weather Statement | MRX | Knox | 39 min |
| Jul 21, 3:17 PM CDT | Special Weather Statement | MRX | Monroe | 43 min |
| Jul 21, 3:45 PM CDT | Special Weather Statement | MRX | Hancock, Hawkins | 60 min |
| Jul 21, 3:47 PM CDT | Special Weather Statement | MRX | Sevier | 58 min |
| Jul 21, 4:12 PM CDT | Special Weather Statement | MRX | Bradley | 63 min |
| Jul 21, 4:19 PM CDT | Severe Thunderstorm Warning | MRX | Bradley, Hamilton, McMinn, Meigs | 56 min |
| Jul 21, 4:33 PM CDT | Special Weather Statement | MRX | Monroe | 42 min |
| Jul 21, 4:44 PM CDT | Special Weather Statement | MRX | Grainger | 46 min |
| Jul 21, 4:49 PM CDT | Special Weather Statement | MRX | Bradley | 26 min |
| Jul 21, 4:53 PM CDT | Severe Thunderstorm Warning | MRX | Bradley, Hamilton | 37 min |
| Jul 21, 5:07 PM CDT | Special Weather Statement | MRX | Polk | 53 min |
| Jul 21, 5:24 PM CDT | Special Weather Statement | MRX | Monroe | 51 min |
| Jul 21, 5:26 PM CDT | Severe Thunderstorm Warning | MRX | Polk | 49 min |
| Jul 21, 6:00 PM CDT | Special Weather Statement | MRX | Blount | 30 min |
| Jul 21, 6:15 PM CDT | Severe Thunderstorm Warning | MRX | Blount, Sevier | 34 min |
| Jul 20, 7:14 PM CDT | Special Weather Statement | MRX | Scott, Wise, City of Norton | 46 min |
| Jul 20, 8:23 PM CDT | Severe Thunderstorm Warning | MRX | Lee | 37 min |
| Jul 20, 10:50 PM CDT | Areal Flood Advisory | MRX | Wise, City of Norton | 3 hr |
| Jul 21, 3:15 PM CDT | Special Weather Statement | MRX | Russell | 45 min |
| Jul 21, 3:59 PM CDT | Special Weather Statement | MRX | Scott | 61 min |
| Jul 21, 4:43 PM CDT | Special Weather Statement | MRX | Russell | 47 min |
| Jul 21, 5:34 PM CDT | Special Weather Statement | MRX | Smyth | 41 min |
| Jul 21, 5:10 PM CDT | Special Weather Statement | MRX | Cherokee | 50 min |
Nearby
Severe Thunderstorm Warnings in Tennessee, 2018Every severe thunderstorm warning 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.