Alert archive / Tennessee / Severe Thunderstorm Warnings in 2017
Severe Thunderstorm Warning 109, NWS Morristown, TN
NWS Morristown, TN issued this severe thunderstorm warning at Nov 18, 2017, 10:16 PM EST for Carter County, Johnson County, Sullivan County, Tennessee; Washington County, City of Bristol, Virginia. It was in force for 29 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
- Nov 18, 2017, 10:16 PM EST (03:16 UTC)
- Expired
- Nov 18, 2017, 10:45 PM EST
- In force
- 29 min
- Issued by
- NWS Morristown, TN
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties Carter County, TN, Johnson County, TN, Sullivan County, TN, City of Bristol, VA, Washington County, VA
The radar
The Knoxville radar (KMRX), 124 km from the middle of the area, began a volume at 03:17 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
Greensboro/Hi Pt, NC (KGSO), launched 00:00Z, 3.3 hours before the alert went out and 202 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1276 m above ground
- 0-6 km bulk shear
- 49 kt
- 0-1 km storm-relative helicity
- 373 m²/s²
- 0-3 km storm-relative helicity
- 491 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
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 Nov 18, 6:46 PM EST, 3 hours 30 minutes earlier.
Area forecast discussion, Nov 18, 6:46 PM EST, 3 hours 30 minutes before
Area Forecast Discussion
National Weather Service Morristown TN
646 PM EST Sat Nov 18 2017
.AVIATION...
The fropa occurs during the opening 6 hour period, 00Z-06Z, with
lowering cigs, rain-reduced vsbys, strong SSW winds becoming WNW
with fropa around 01-02Z. Expect mostly MVFR vsbys and cigs
during the weather; MVFR cigs will linger even after the vsbys
improve with rain departure. Cigs improving after 12Z to VFR.
&&
.MRX WATCHES/WARNINGS/ADVISORIES...
NC...Wind Advisory until 4 AM EST Sunday for Cherokee-Clay.
TN...Wind Advisory until 4 AM EST /3 AM CST/ Sunday for Anderson-
Bledsoe-Blount Smoky Mountains-Bradley-Campbell-Claiborne-
Cocke Smoky Mountains-East Polk-Grainger-Hamblen-Hamilton-
Hancock-Hawkins-Jefferson-Johnson-Knox-Loudon-Marion-McMinn-
Meigs-Morgan-NW Blount-North Sevier-Northwest Carter-
Northwest Cocke-Northwest Greene-Northwest Monroe-Rhea-
Roane-Scott TN-Sequatchie-Sevier Smoky Mountains-Southeast
Carter-Southeast Greene-Southeast Monroe-Sullivan-Unicoi-
Union-Washington TN-West Polk.
VA...Wind Advisory until 4 AM EST Sunday for Lee-Russell-Scott-
Washington-Wise.
&&
GCHazardous weather outlook, Nov 18, 3:29 PM EST, 6 hours 47 minutes before
Hazardous Weather Outlook National Weather Service Morristown TN 329 PM EST Sat Nov 18 2017 NCZ060-061-TNZ012>018-035>047-067>074-081>087-098>102-VAZ001-002- 005-006-008-192030- 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- 329 PM EST Sat Nov 18 2017 /229 PM CST Sat Nov 18 2017/ This Hazardous Weather Outlook is for portions of Southwest North Carolina...East Tennessee and Southwest Virginia. .DAY ONE...This Afternoon and Tonight A wind advisory is in effect through tonight. South to southwest winds will continue to be gusty through this evening. Winds will shift to the west northwest tonight but remain gusty as a cold front crosses the area. An isolated thunderstorm this evening may also produce locally stronger wind gusts, which could potentially cause damage. Light snow accumulations are possible overnight at the highest elevations. .DAYS TWO THROUGH SEVEN...Sunday through Friday The weather will be turning suddenly much colder for Sunday, with wind chill readings in the teens in the higher elevations on Sunday afternoon. .SPOTTER INFORMATION STATEMENT... Spotter activation will not be needed, but are encouraged to report any damaging winds.
In the hours before
Special weather statement, Nov 18, 9:11 PM EST, 1 hour 5 minutes before
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</html>Local storm report, Nov 18, 9:23 PM EST, 53 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 |
|---|---|---|---|---|
| Nov 18, 7:16 PM EST | Special Weather Statement | MRX | Bledsoe, Marion, Sequatchie | 44 min |
| Nov 18, 7:25 PM EST | Special Weather Statement | MRX | Scott | 65 min |
| Nov 18, 7:59 PM EST | Special Weather Statement | MRX | Hamilton, Marion, Meigs, Rhea | 61 min |
| Nov 18, 8:21 PM EST | Special Weather Statement | MRX | Anderson, Blount, Knox, Loudon, Roane | 54 min |
| Nov 18, 8:25 PM EST | Special Weather Statement | MRX | Bradley, McMinn, Monroe, Polk | 65 min |
| Nov 18, 9:09 PM EST | Special Weather Statement | MRX | Cocke, Grainger, Hamblen, Jefferson, Sevier | 51 min |
| Nov 18, 9:37 PM EST | Special Weather Statement | MRX | Greene, Hawkins, Sullivan, Washington | 53 min |
| Nov 18, 10:13 PM EST | Special Weather Statement | MRX | Carter, Johnson | 62 min |
| Nov 18, 10:00 PM EST | Special Weather Statement | MRX | Washington, City of Bristol | 60 min |
| Nov 18, 9:11 PM EST | Special Weather Statement | MRX | Cherokee, Clay | 64 min |
Nearby
Severe Thunderstorm Warnings in Tennessee, 2017Severe Thunderstorm Warnings in Virginia, 2017Every severe thunderstorm warning in 2017
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.