Alert archive / Tennessee / Special Weather Statements in 2018
Special Weather Statement, NWS Morristown, TN
NWS Morristown, TN issued this special weather statement at May 31, 2018, 7:21 PM EDT for Sevier County, Tennessee. It was in force for 39 min. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- May 31, 2018, 7:21 PM EDT (23:21 UTC)
- Expired
- May 31, 2018, 8:00 PM EDT
- In force
- 39 min
- Issued by
- NWS Morristown, TN
County Sevier County, TN
The radar
The Knoxville radar (KMRX), 43 km from the middle of the area, began a volume at 23:24 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 263 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
- 1202 J/kg
- Mixed-layer CIN
- -109 J/kg
- Mixed-layer LCL
- 822 m above ground
- 0-6 km bulk shear
- 22 kt
- 0-1 km storm-relative helicity
- 234 m²/s²
- 0-3 km storm-relative helicity
- 224 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 5.2
The text
As transmitted.
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</html>What forecasters said that day
The local office's own words before this special weather statement 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 special weather statement went out at May 31, 6:14 PM EDT, 1 hour 7 minutes earlier.
Area forecast discussion, May 31, 6:14 PM EDT, 1 hour 7 minutes before
Area Forecast Discussion National Weather Service Morristown TN 614 PM EDT Thu May 31 2018 .DISCUSSION...Quick update to the forecast to raise POPs quite a bit than what was previously forecast. Areas along and north of I-40 raised to categorical and just south of I-40 raised to likely. This is all to account for the showers and storms currently seen on radar. Also raised QPF quite a bit for these areas as well, generally around half an inch for most places. Some areas will see more and some less. Storms not overly strong at this hour. However, still a threat for isolated wind damage and flooding as some of these storms have moderate to heavy rainfall. && .PRELIMINARY POINT TEMPS/POPS... Chattanooga Airport, TN 71 86 70 87 / 50 60 60 20 Knoxville McGhee Tyson Airport, TN 70 84 69 87 / 80 60 60 40 Oak Ridge, TN 70 84 69 87 / 80 60 40 30 Tri Cities Airport, TN 66 81 65 81 / 80 60 60 50 && .MRX WATCHES/WARNINGS/ADVISORIES... NC...None. TN...None. VA...None. && SR
Hazardous weather outlook, May 31, 3:22 PM EDT, 3 hours 59 minutes before
Hazardous Weather Outlook National Weather Service Morristown TN 322 PM EDT Thu May 31 2018 NCZ060-061-TNZ012>018-035>047-067>074-081>087-098>102-VAZ001-002- 005-006-008-011930- 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- 322 PM EDT Thu May 31 2018 /222 PM CDT Thu May 31 2018/ This Hazardous Weather Outlook is for portions of Southwest North Carolina...East Tennessee and Southwest Virginia. .DAY ONE...This Afternoon and Tonight Strong to marginally severe storms will be possible this afternoon across the Southern Appalachians. The main impacts with these storms will be damaging winds and hail up to quarter size. Heavy downpours on an already saturated ground will lead to areas of localized flash flooding, especially in areas of poor drainage. Another round of showers and storms will move in late tonight into early Friday morning. The threats with these storms will once again be damaging winds and hail up to quarter size. Best chances for severe weather this evening will be north of I-40 and west of I-75. Heavy rainfall will once again lead to the possibility of localized flash flooding, especially in areas of poor drainage. A flood warning remains in effect for areas in southwest North Carolina along the Hiawasse River and associated tributaries related to the higher than normal dam release from Lake Chatuge. .DAYS TWO THROUGH SEVEN...Friday through Wednesday Showers and thunderstorms will move across the forecast area Friday afternoon into Friday night. Some strong to severe storms could occur, especially north of the Knoxville area, Friday evening. Damaging winds would be the main concern, with some hail possibly occurring as well. .SPOTTER INFORMATION STATEMENT... Spotter activation maybe needed this afternoon and evening.
In the hours before
Special weather statement, May 31, 6:16 PM EDT, 1 hour 5 minutes before
Special Weather Statement
National Weather Service Morristown TN
616 PM EDT THU MAY 31 2018
TNZ016>018-042>047-VAZ008-312315-
Sullivan TN-Washington TN-Northwest Greene TN-Northwest Carter TN-
Southeast Carter TN-Southeast Greene TN-Unicoi TN-Hawkins TN-
Johnson TN-Washington VA-
616 PM EDT THU MAY 31 2018
...SIGNIFICANT WEATHER ADVISORY FOR SULLIVAN...SOUTHERN HAWKINS...
WASHINGTON...GREENE...UNICOI...JOHNSON...CARTER AND SOUTHEASTERN
WASHINGTON COUNTIES UNTIL 715 PM EDT...
At 616 PM EDT, Doppler radar was tracking strong thunderstorms along
a line extending from 6 miles south of Rogersville to near Whitetop.
Movement was southeast at 25 mph.
Winds in excess of 40 mph will be possible with these storms.
Locations impacted include...
Johnson City, Kingsport, Bristol Tn, Greeneville, Elizabethton,
Erwin, Mountain City, Jonesborough, Tusculum, Banner Hill, Central,
Midway, Pine Crest, Colonial Heights, Gray, Oak Grove, Hampton,
Spurgeon, Walnut Hill and Unicoi.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Torrential rainfall is also occurring with these storms, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.
Frequent cloud to ground lightning is occurring with these storms.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.
&&
LAT...LON 3659 8168 3653 8171 3647 8170 3640 8174
3634 8171 3634 8177 3636 8179 3634 8184
3630 8191 3620 8198 3615 8219 3616 8222
3613 8225 3614 8229 3604 8261 3607 8264
3601 8275 3632 8314 3671 8166 3664 8161
TIME...MOT...LOC 2216Z 308DEG 23KT 3632 8301 3667 8165
DGSLocal storm report, May 31, 7:09 PM EDT, 12 minutes before
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</html>Local storm report, May 31, 7:12 PM EDT, 9 minutes before
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</html>Local storm report, May 31, 7:16 PM EDT, 5 minutes before
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</html>Local storm report, May 31, 7:20 PM EDT, 1 minute before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MORRISTOWN TN
720 PM EDT THU MAY 31 2018
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0705 PM TSTM WND DMG MAYNARDVILLE 36.25N 83.81W
05/31/2018 UNION TN 911 CALL CENTER
TREES AND POWER LINES DOWN COUNTY-WIDE IN UNION COUNTY.
&&
DHSpecial weather statement, May 31, 7:21 PM EDT, 0 minutes before
Special Weather Statement
National Weather Service Morristown TN
721 PM EDT THU MAY 31 2018
TNZ069>071-073-010000-
Jefferson TN-Knox TN-NW Blount TN-North Sevier TN-
721 PM EDT THU MAY 31 2018
...SIGNIFICANT WEATHER ADVISORY FOR SOUTHEASTERN KNOX...SOUTH CENTRAL
JEFFERSON AND CENTRAL SEVIER COUNTIES UNTIL 800 PM EDT...
At 721 PM EDT, Doppler radar was tracking a strong thunderstorm near
Knoxville, moving east at 25 mph.
Nickel size hail and winds in excess of 40 mph will be possible with
this storm.
Locations impacted include...
Knoxville, Sevierville, Gatlinburg, Pigeon Forge, McMahan, Lake
Forest, Harrisburg, Fairgarden, Seymour, Kodak and Kimberlin Heights.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Torrential rainfall is also occurring with this storm, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.
&&
LAT...LON 3580 8382 3590 8398 3607 8390 3595 8335
3576 8344 3572 8354
TIME...MOT...LOC 2321Z 291DEG 24KT 3597 8386
SRThe office that day
Everything else NWS Morristown, TN issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 31, 12:26 PM EDT | Special Weather Statement | MRX | Bledsoe, Rhea | 49 min |
| May 31, 1:14 PM EDT | Special Weather Statement | MRX | Bledsoe, Meigs, Rhea | 46 min |
| May 31, 1:33 PM EDT | Areal Flood Advisory | MRX | Bledsoe, Meigs, Rhea | 3 hr |
| May 31, 1:53 PM EDT | Special Weather Statement | MRX | Bledsoe, McMinn, Meigs, Sequatchie | 37 min |
| May 31, 1:59 PM EDT | Areal Flood Advisory | MRX | Marion | 3 hr |
| May 31, 2:28 PM EDT | Special Weather Statement | MRX | Bradley, Hamilton, McMinn, Monroe, Polk, Sequatchie | 32 min |
| May 31, 2:47 PM EDT | Areal Flood Advisory | MRX | Bradley, McMinn, Monroe, Polk | 3 hr |
| May 31, 2:55 PM EDT | Areal Flood Warning | MRX | Bledsoe, Meigs, Rhea | 3 hr |
| May 31, 3:01 PM EDT | Special Weather Statement | MRX | Polk | 44 min |
| May 31, 3:16 PM EDT | Areal Flood Warning | MRX | Bradley, Hamilton, Polk | 89 min |
| May 31, 5:17 PM EDT | Severe Thunderstorm Warning | MRX | Morgan, Scott | 43 min |
| May 31, 5:28 PM EDT | Special Weather Statement | MRX | Hancock, Hawkins, Sullivan | 62 min |
| May 31, 5:52 PM EDT | Severe Thunderstorm Warning | MRX | Campbell, Scott | 53 min |
| May 31, 6:16 PM EDT | Special Weather Statement | MRX | Carter, Greene, Johnson, Sullivan, Unicoi, Washington | 59 min |
| May 31, 6:24 PM EDT | Areal Flood Advisory | MRX | Campbell, Scott | 2 hr |
| May 31, 6:29 PM EDT | Severe Thunderstorm Warning | MRX | Grainger, Hamblen, Hancock, Hawkins | 46 min |
| May 31, 6:32 PM EDT | Severe Thunderstorm Warning | MRX | Anderson, Campbell, Union | 58 min |
| May 31, 6:36 PM EDT | Severe Thunderstorm Warning | MRX | Greene, Unicoi, Washington | 54 min |
| May 31, 6:47 PM EDT | Severe Thunderstorm Warning | MRX | Grainger, Hamblen, Jefferson | 43 min |
| May 31, 6:59 PM EDT | Flash Flood Warning | MRX | Scott | 4 hr |
| May 31, 7:03 PM EDT | Severe Thunderstorm Warning | MRX | Grainger, Hamblen, Jefferson, Knox | 31 min |
| May 31, 7:27 PM EDT | Severe Thunderstorm Warning | MRX | Cocke, Greene, Hamblen, Jefferson | 48 min |
| May 31, 7:49 PM EDT | Areal Flood Advisory | MRX | Cocke, Greene | 116 min |
| May 30, 10:09 PM EDT | Areal Flood Advisory | MRX | Lee, Scott, Wise, City of Norton | 2 hr |
| May 31, 2:57 AM EDT | Areal Flood Warning | MRX | Cherokee, Clay | 36 hr |
| May 31, 1:16 PM EDT | Special Weather Statement | MRX | Graham | 29 min |
| May 31, 3:38 PM EDT | Flash Flood Warning | MRX | Cherokee, Clay | 69 min |
Nearby
Special Weather Statements in Tennessee, 2018Every special weather statement 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.