Alert archive / Tennessee / Severe Thunderstorm Warnings in 2014

Severe Thunderstorm Warning 18, NWS Morristown, TN

February 21, 20145 counties in Tennessee

NWS Morristown, TN issued this severe thunderstorm warning at Feb 21, 2014, 3:14 AM EST for 5 counties in Tennessee. It was in force for 61 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: Feb 21, 2014, 3:14 AM EST (08:14 UTC)
Expired: Feb 21, 2014, 4:15 AM EST
In force: 61 min
Issued by: NWS Morristown, TN
Area: Storm-based polygon

Counties Carter County, TN, Greene County, TN, Johnson County, TN, Unicoi County, TN, Washington County, TN

The radar

The Knoxville radar (KMRX), 95 km from the middle of the area, began a volume at 08:15 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
Feb 20, 10:47 PM EST	Tornado Watch	SPC	6 hr

The nearest sounding before it

Roanoke, VA (KRNK), launched 00:00Z, 8.2 hours before the alert went out and 274 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 873 m above ground
0-6 km bulk shear: 59 kt
0-1 km storm-relative helicity: 364 m²/s²
0-3 km storm-relative helicity: 440 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

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 Feb 21, 12:20 AM EST, 2 hours 54 minutes earlier.

Area forecast discussion, Feb 21, 12:20 AM EST, 2 hours 54 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE MORRISTOWN TN
1220 AM EST FRI FEB 21 2014

.AVIATION...A COLD FRONT WILL SWING THROUGH EARLY IN THE
PERIOD...ALONG WITH SOME SHOWERS AND THUNDERSTORMS. GUSTY SOUTH TO
SOUTHWEST WINDS AHEAD OF THE FRONT...SWITCHING TO SOUTHWEST TO WEST
BEHIND IT. CLEARING BEHIND THE FRONT DURING THE FIRST PART OF THE
DAY. WILL CARRY BRIEF MVFR CONDITIONS AND THUNDER WITH THE MAIN
LINE OF PRECIP...OTHERWISE VFR CONDITIONS EXPECTED.

&&

.MRX WATCHES/WARNINGS/ADVISORIES...
NC...WIND ADVISORY UNTIL 4 AM EST FRIDAY FOR THE FOLLOWING ZONES:
     CHEROKEE...CLAY.

TN...WIND ADVISORY UNTIL 4 AM EST /3 AM CST/ FRIDAY FOR THE FOLLOWING
     ZONES: BLEDSOE...BLOUNT SMOKY MOUNTAINS...CAMPBELL...
     CLAIBORNE...COCKE SMOKY MOUNTAINS...EAST POLK...JOHNSON...
     MARION...MORGAN...SCOTT TN...SEQUATCHIE...SEVIER SMOKY
     MOUNTAINS...SOUTHEAST CARTER...SOUTHEAST GREENE...SOUTHEAST
     MONROE...UNICOI.

VA...WIND ADVISORY UNTIL 4 AM EST FRIDAY FOR THE FOLLOWING ZONES:
     LEE...RUSSELL...WISE.

&&

LW

Hazardous weather outlook, Feb 20, 4:46 AM EST, 22 hours 28 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE MORRISTOWN TN
446 AM EST THU FEB 20 2014

NCZ060-061-TNZ012>018-035>047-067>074-081>087-098>102-VAZ001-002-
005-006-008-211000-
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-
446 AM EST THU FEB 20 2014 /346 AM CST THU FEB 20 2014/

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF SOUTHWEST NORTH
CAROLINA...EAST TENNESSEE AND SOUTHWEST VIRGINIA.

.DAY ONE...TODAY AND TONIGHT...

...STRONG TO SEVERE THUNDERSTORMS EXPECTED ACROSS THE TENNESSEE
VALLEY AND SOUTHERN APPALACHIANS TONIGHT...

A STRONG LOW PRESSURE SYSTEM OVER THE MID MISSISSIPPI AND OHIO
VALLEYS WILL DRAG A COLD FRONT INTO THE TENNESSEE VALLEY TONIGHT...AND
BRING THE POSSIBILITY OF SOME STRONG TO SEVERE THUNDERSTORMS. GIVEN
THE STRONG WIND FIELD ASSOCIATED WITH THIS STORM SYSTEM...DAMAGING
WINDS WILL BE THE PRIMARY THREAT WITH THESE STORMS...BUT ISOLATED
TORNADOES COULD ALSO OCCUR WITH THE STRONGEST ACTIVITY.

IN ADDITION...WINDY CONDITIONS CAN BE EXPECTED THIS AFTERNOON
THROUGH LATE TONIGHT OVER THE HIGHER ELEVATIONS OF SOUTHWEST
VIRGINIA AND EAST TENNESSEE...THE CUMBERLAND PLATEAU...AND
SOUTHWEST NORTH CAROLINA. A WIND ADVISORY IS IN EFFECT FOR THESE
AREAS AS SUSTAINED WINDS OF 20 TO 30 MPH...WITH GUSTS TO 45 MPH ARE
EXPECTED FROM 1 PM EST THIS AFTERNOON THROUGH 4 AM ON FRIDAY.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY...

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL LIKELY BE NEEDED THIS EVENING THROUGH
TONIGHT DUE TO THE RISK OF SEVERE WEATHER.

In the hours before

Local storm report, Feb 21, 1:52 AM EST, 1 hour 22 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MORRISTOWN TN
152 AM EST FRI FEB 21 2014

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0150 AM     TSTM WND DMG     LOUDON                  35.74N 84.36W
02/21/2014                   LOUDON             TN   911 CALL CENTER

            SEVERAL TREES DOWN ACROSS THE COUNTY.

&&

Local storm report, Feb 21, 1:53 AM EST, 1 hour 21 minutes before

PRELIMINARY LOCAL STORM REPORT...SUMMARY
NATIONAL WEATHER SERVICE MORRISTOWN TN
153 AM EST FRI FEB 21 2014

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1225 AM     TSTM WND DMG     SOUTH PITTSBURG         35.02N 85.71W
02/21/2014                   MARION             TN   EMERGENCY MNGR

            *** 1 INJ *** SEVERAL TREES DOWN ACROSS THE COUNTY WITH
            STRUCTURAL DAMAGE TO A MOBILE HOME.

1255 AM     TSTM WND DMG     DEERLODGE               36.20N 84.76W
02/21/2014                   MORGAN             TN   911 CALL CENTER

            SEVERAL TREES DOWN NEAR DEELODGE AREA.

0115 AM     TSTM WND DMG     HARRIMAN                35.93N 84.56W
02/21/2014                   ROANE              TN   911 CALL CENTER

            SEVERAL TREES DOWN NEAR HARRIMAN.

0150 AM     TSTM WND DMG     LOUDON                  35.74N 84.36W
02/21/2014                   LOUDON             TN   911 CALL CENTER

            SEVERAL TREES DOWN ACROSS THE COUNTY.

&&

Local storm report, Feb 21, 2:04 AM EST, 1 hour 10 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MORRISTOWN TN
204 AM EST FRI FEB 21 2014

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0140 AM     TSTM WND DMG     DECATUR                 35.53N 84.79W
02/21/2014                   MEIGS              TN   911 CALL CENTER

            TWO TREES DOWN ON HWY 58 AND HWY 54

&&

Local storm report, Feb 21, 2:12 AM EST, 1 hour 2 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MORRISTOWN TN
212 AM EST FRI FEB 21 2014

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1255 AM     TSTM WND DMG     CHATTANOOGA             35.07N 85.26W
02/21/2014                   HAMILTON           TN   911 CALL CENTER

            NUMEROUS TREES DOWN ACROSS THE COUNTY

&&

Local storm report, Feb 21, 2:58 AM EST, 16 minutes before

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Local storm report, Feb 21, 3:12 AM EST, 2 minutes before

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      <h1 id="headline">This service is currently unavailable.</h1>
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        The site you requested is temporarily down for maintenance or an unexpected outage.
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      <p id="message2">
        Please try again in a few minutes.
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The office that day

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

Issued	Product	Office	Counties	Lasted
Feb 20, 11:17 PM EST	Severe Thunderstorm Warning	MRX	Bledsoe, Marion, Sequatchie	58 min
Feb 20, 11:21 PM EST	Severe Thunderstorm Warning	MRX	Campbell, Morgan, Scott	54 min
Feb 21, 12:06 AM EST	Severe Thunderstorm Warning	MRX	Bledsoe, Hamilton, Marion, Meigs, Rhea, Sequatchie	54 min
Feb 21, 12:10 AM EST	Severe Thunderstorm Warning	MRX	Anderson, Campbell, Claiborne, Morgan, Roane, Scott	65 min
Feb 21, 12:15 AM EST	Severe Thunderstorm Warning	MRX	Marion	15 min
Feb 21, 12:53 AM EST	Severe Thunderstorm Warning	MRX	Anderson, Campbell, Knox, Loudon, Morgan, Roane	67 min
Feb 21, 12:54 AM EST	Severe Thunderstorm Warning	MRX	Bradley, Hamilton, McMinn, Meigs, Monroe, Rhea	51 min
Feb 21, 1:00 AM EST	Severe Thunderstorm Warning	MRX	Bradley, Hamilton	60 min
Feb 21, 1:36 AM EST	Severe Thunderstorm Warning	MRX	McMinn, Monroe	39 min
Feb 21, 1:39 AM EST	Severe Thunderstorm Warning	MRX	Anderson, Blount, Campbell, Claiborne, Grainger, Hamblen and 5 more	66 min
Feb 21, 1:58 AM EST	Severe Thunderstorm Warning	MRX	Bradley, McMinn, Monroe, Polk	47 min
Feb 21, 2:16 AM EST	Severe Thunderstorm Warning	MRX	Claiborne, Grainger, Hancock, Hawkins, Sullivan	44 min
Feb 21, 2:34 AM EST	Severe Thunderstorm Warning	MRX	Blount, Cocke, Greene, Hamblen, Jefferson, Knox and 1 more	56 min
Feb 21, 3:08 AM EST	Severe Thunderstorm Warning	MRX	Hawkins, Sullivan	52 min
Feb 21, 3:58 AM EST	Severe Thunderstorm Warning	MRX	Carter, Johnson, Sullivan	47 min

Nearby

Severe Thunderstorm Warnings in Tennessee, 2014 Every severe thunderstorm warning in 2014

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.