Alert archive / Tennessee / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 21, NWS Morristown, TN

March 17, 2018Cocke County, Sevier County, Tennessee

NWS Morristown, TN issued this severe thunderstorm warning at Mar 17, 2018, 9:29 PM EDT for Cocke County, Sevier County, Tennessee. It was in force for 46 min. 1 report came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Mar 17, 2018, 9:29 PM EDT (01:29 UTC)
Expired: Mar 17, 2018, 10:15 PM EDT
In force: 46 min
Issued by: NWS Morristown, TN
Area: Storm-based polygon
Hail: 1.25 in
Wind: 60.0 mph

Counties Cocke County, TN, Sevier County, TN

The radar

The Knoxville radar (KMRX), 43 km from the middle of the area, began a volume at 01:29 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.

What was reported inside it

Time	Report	Where	Remark
Mar 17, 9:30 PM EDT	HAIL 1	2 E Pigeon Forge, TN

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Mar 17, 4:33 PM EDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Greensboro/Hi Pt, NC (KGSO), launched 00:00Z, 1.5 hours before the alert went out and 294 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: 6 J/kg
Mixed-layer CIN: -163 J/kg
Mixed-layer LCL: 1662 m above ground
0-6 km bulk shear: 66 kt
0-1 km storm-relative helicity: 154 m²/s²
0-3 km storm-relative helicity: 261 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

331 
WUUS54 KMRX 180129
SVRMRX
TNC029-155-180215-
/O.NEW.KMRX.SV.W.0021.180318T0129Z-180318T0215Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Morristown TN
929 PM EDT SAT MAR 17 2018

The National Weather Service in Morristown has issued a

* Severe Thunderstorm Warning for...
  Southern Cocke County in east Tennessee...
  Central Sevier County in east Tennessee...

* Until 1015 PM EDT

* At 929 PM EDT, a severe thunderstorm was located over Pigeon Forge,
  or near Sevierville, moving east at 55 mph.

  HAZARD...60 mph wind gusts and half dollar size hail. 

  SOURCE...Radar indicated. 

  IMPACT...Hail damage to vehicles is expected. Expect wind damage 
           to roofs, siding, and trees. 

* Locations impacted include...
  Sevierville, Gatlinburg, Pigeon Forge, Pittman Center, Del Rio,
  Fairgarden, Round Mountain, Cosby, Harrisburg, Hartford, Max Patch,
  Waterville and Great Smoky Mountains National Park.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Prepare immediately for large hail and damaging winds. People outside
should move immediately to shelter inside a strong building. Stay
away from windows.

&&

LAT...LON 3573 8367 3586 8367 3591 8332 3590 8331
      3591 8329 3596 8292 3595 8290 3593 8290
      3593 8292 3588 8290 3587 8292 3584 8292
      3577 8299 3579 8303 3579 8308 3577 8311
      3577 8316 3573 8320
TIME...MOT...LOC 0129Z 266DEG 48KT 3582 8357 

HAIL...1.25IN
WIND...60MPH
 
$$

dh

2 follow-up statements

258 
WWUS54 KMRX 180140
SVSMRX

Severe Weather Statement
National Weather Service Morristown TN
940 PM EDT SAT MAR 17 2018

TNC029-155-180215-
/O.CON.KMRX.SV.W.0021.000000T0000Z-180318T0215Z/
Cocke TN-Sevier TN-
940 PM EDT SAT MAR 17 2018

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1015 PM EDT
FOR SOUTHERN COCKE AND EAST CENTRAL SEVIER COUNTIES...

At 940 PM EDT, a severe thunderstorm was located 9 miles northeast of
Gatlinburg, moving east at 55 mph.

HAZARD...60 mph wind gusts and half dollar size hail. 

SOURCE...Radar indicated. 

IMPACT...Hail damage to vehicles is expected. Expect wind damage to 
         roofs, siding, and trees. 

Locations impacted include...
Gatlinburg, Pittman Center, Del Rio, Round Mountain, Cosby, Hartford,
Max Patch, Fairgarden, Waterville and Great Smoky Mountains National
Park.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

Prepare immediately for large hail and damaging winds. People outside
should move to a shelter, inside a strong building and away from
windows.

&&

LAT...LON 3574 8344 3588 8344 3591 8332 3590 8331
      3591 8329 3596 8292 3595 8290 3593 8290
      3593 8292 3588 8290 3587 8292 3584 8292
      3577 8299 3579 8303 3579 8308 3577 8311
      3577 8316 3573 8320
TIME...MOT...LOC 0140Z 266DEG 48KT 3583 8339 

HAIL...1.25IN
WIND...60MPH
 
$$

dh

929 
WWUS54 KMRX 180156
SVSMRX

Severe Weather Statement
National Weather Service Morristown TN
956 PM EDT SAT MAR 17 2018

TNC155-180206-
/O.CAN.KMRX.SV.W.0021.000000T0000Z-180318T0215Z/
Sevier TN-
956 PM EDT SAT MAR 17 2018

...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL SEVIER COUNTY IS
CANCELLED...
    
The severe thunderstorm which prompted the warning has moved out of 
the warned area. Therefore, the warning has been cancelled.

A severe thunderstorm watch remains in effect until midnight EDT for
east Tennessee.

LAT...LON 3576 8321 3589 8321 3596 8292 3595 8290
      3593 8290 3593 8292 3588 8290 3587 8292
      3584 8292 3577 8299 3579 8303 3579 8308
      3577 8311 3577 8316
TIME...MOT...LOC 0156Z 266DEG 49KT 3584 8310 

$$

TNC029-180215-
/O.CON.KMRX.SV.W.0021.000000T0000Z-180318T0215Z/
Cocke TN-
956 PM EDT SAT MAR 17 2018

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1015 PM EDT
FOR SOUTHEASTERN COCKE COUNTY...

At 956 PM EDT, a severe thunderstorm was located near Smoky
Mountains-Big Creek, or 9 miles southeast of Newport, moving east at
55 mph.

HAZARD...60 mph wind gusts and quarter size hail. 

SOURCE...Radar indicated. 

IMPACT...Hail damage to vehicles is expected. Expect wind damage to 
         roofs, siding, and trees. 

Locations impacted include...
Round Mountain, Del Rio, Hartford, Max Patch and Waterville. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Prepare immediately for large hail and damaging winds. People outside
should move to a shelter, inside a strong building and away from
windows.

&&

LAT...LON 3576 8321 3589 8321 3596 8292 3595 8290
      3593 8290 3593 8292 3588 8290 3587 8292
      3584 8292 3577 8299 3579 8303 3579 8308
      3577 8311 3577 8316
TIME...MOT...LOC 0156Z 266DEG 49KT 3584 8310 

HAIL...1.00IN
WIND...60MPH
 
$$

dh

The office that day

Everything else NWS Morristown, TN issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Mar 17, 8:02 PM EDT	Severe Thunderstorm Warning	MRX	Greene, Hawkins, Sullivan, Washington	43 min
Mar 17, 8:11 PM EDT	Severe Thunderstorm Warning	MRX	Loudon, Meigs, Rhea, Roane	49 min
Mar 17, 8:37 PM EDT	Severe Thunderstorm Warning	MRX	Greene, Hawkins, Washington	53 min
Mar 17, 8:41 PM EDT	Severe Thunderstorm Warning	MRX	Carter, Johnson, Sullivan, Unicoi, Washington	64 min
Mar 17, 8:41 PM EDT	Severe Thunderstorm Warning	MRX	Polk	19 min
Mar 17, 9:01 PM EDT	Special Weather Statement	MRX	Sevier	44 min
Mar 17, 9:11 PM EDT	Severe Thunderstorm Warning	MRX	Greene, Hancock, Hawkins, Sullivan, Washington	49 min
Mar 17, 9:36 PM EDT	Special Weather Statement	MRX	Greene, Hamblen	39 min
Mar 17, 9:44 PM EDT	Severe Thunderstorm Warning	MRX	Grainger, Greene, Hamblen, Hawkins	31 min
Mar 17, 9:51 PM EDT	Severe Thunderstorm Warning	MRX	Carter, Johnson, Sullivan, Unicoi, Washington	54 min
Mar 17, 10:16 PM EDT	Special Weather Statement	MRX	Greene, Unicoi	44 min
Mar 17, 10:23 PM EDT	Severe Thunderstorm Warning	MRX	Blount, Sevier	35 min

Nearby

Severe Thunderstorm Warnings in Tennessee, 2018 Every 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.