Alert archive / Tennessee / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 207, NWS Morristown, TN

June 17, 2009Blount County, Monroe County, Tennessee; Cherokee County, Clay County, North Carolina

NWS Morristown, TN issued this severe thunderstorm warning at Jun 17, 2009, 9:49 PM EDT for Blount County, Monroe County, Tennessee; Cherokee County, Clay County, North Carolina. It was in force for 56 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: Jun 17, 2009, 9:49 PM EDT (01:49 UTC)
Expired: Jun 17, 2009, 10:45 PM EDT
In force: 56 min
Issued by: NWS Morristown, TN
Area: Storm-based polygon

Counties Cherokee County, NC, Clay County, NC, Blount County, TN, Monroe County, TN

The radar

The Knoxville radar (KMRX), 108 km from the middle of the area, began a volume at 01:49 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
Jun 17, 12:54 PM EDT	Severe Thunderstorm Watch	SPC	9 hr

The nearest sounding before it

Peachtre/Fal Fld, GA (KFFC), launched 00:00Z, 1.8 hours before the alert went out and 223 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: 2353 J/kg
Mixed-layer CIN: -8 J/kg
Mixed-layer LCL: 1472 m above ground
0-6 km bulk shear: 23 kt
0-1 km storm-relative helicity: 30 m²/s²
0-3 km storm-relative helicity: 104 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.4

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 Jun 17, 7:21 PM EDT, 2 hours 28 minutes earlier.

Area forecast discussion, Jun 17, 7:21 PM EDT, 2 hours 28 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE MORRISTOWN TN
721 PM EDT WED JUN 17 2009

.AVIATION...A VERY MOIST AND UNSTABLE AIRMASS WILL PRODUCE
SCATTERED THUNDERSTORMS FOR THE NEXT HOUR OR TWO WITH THE BEST
CHANCE AT TYS. HAVE PUT TEMPO THUNDER IN AT TYS NEXT HOUR WITH VCTS
AT CHA UNTIL 03Z WITH ACTIVITY STILL UPSTREAM. CONVECTION WILL DISSIPATE BY
AROUND 1-2Z WITH POSSIBLE MVFR CEILING DEVELOPING. IFR CONDITIONS
EXPECTED AT TRI AFTER 06Z WITH SOME FOG. VFR CONDITIONS EXPECTED AT
ALL TAF SITES BY 14-15Z THURSDAY WITH SHOWERS AND THUNDERSTORMS AT
TRI AROUND 18Z.

&&

.MRX WATCHES/WARNINGS/ADVISORIES...
NC...NONE.
TN...FLASH FLOOD WATCH UNTIL 11 PM EDT THIS EVENING FOR THE FOLLOWING
     ZONES: ANDERSON...BLOUNT SMOKY MOUNTAINS...CAMPBELL...
     CLAIBORNE...COCKE SMOKY MOUNTAINS...GRAINGER...HAMBLEN...
     HANCOCK...HAWKINS...JEFFERSON...JOHNSON...KNOX...LOUDON...
     MORGAN...NW BLOUNT...NORTH SEVIER...NORTHWEST CARTER...
     NORTHWEST COCKE...NORTHWEST GREENE...ROANE...SCOTT TN...
     SEVIER SMOKY MOUNTAINS...SOUTHEAST CARTER...SOUTHEAST
     GREENE...SULLIVAN...UNICOI...UNION...WASHINGTON TN.

VA...FLASH FLOOD WATCH UNTIL 11 PM EDT THIS EVENING FOR THE FOLLOWING
     ZONES: LEE...RUSSELL...SCOTT...WASHINGTON...WISE.

&&

TD

Hazardous weather outlook, Jun 17, 10:53 AM EDT, 10 hours 56 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE MORRISTOWN TN
1053 AM EDT WED JUN 17 2009

NCZ060-061-TNZ012>018-035>047-067>074-081>087-098>102-VAZ001-002-
005-006-008-181500-
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-
1053 AM EDT WED JUN 17 2009 /953 AM CDT WED JUN 17 2009/

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

.DAY ONE...TODAY AND TONIGHT

...FLASH FLOOD WATCH IN EFFECT UNTIL THIS EVENING FOR SOUTHWEST
VIRGINIA AND NORTHERN HALF OF EAST TENNESSEE...
...SEVERE THUNDERSTORMS PRODUCING LARGE HAIL...DAMAGING WINDS...AND
ISOLATED TORNADOES POSSIBLE THIS AFTERNOON AND EVENING...

THUNDERSTORMS WILL REDEVELOP ACROSS ALL OF EAST TENNESSEE...
SOUTHWEST VIRGINIA...AND SOUTHWEST NORTH CAROLINA THIS AFTERNOON
AND EVENING. AIRMASS WILL BE QUITE UNSTABLE AND MOIST PRODUCING
STRONG TO SEVERE THUNDERSTORMS. THE MAIN CONCERN WILL BE LARGE
HAIL...DAMAGING WINDS...AND ISOLATED TORNADOES.

BESIDES THE SEVERE STORMS...TORRENTIAL RAINS ARE ALSO ANTICIPATED
WHICH MAY PRODUCE LOCALIZED FLASH FLOODING OF SMALL STREAMS...LOW
LYING AREAS...AND MUD SLIDES.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY

NO HAZARDOUS WEATHER IS EXPECTED.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL LIKELY BE NEEDED TODAY.

DH

In the hours before

Local storm report, Jun 17, 7:54 PM EDT, 1 hour 55 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MORRISTOWN TN
754 PM EDT WED JUN 17 2009

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

0625 PM     TSTM WND DMG     2 SW CASTLEWOOD         36.86N 82.31W
06/17/2009                   RUSSELL            VA   LAW ENFORCEMENT

            A FEW TREES DOWN NEAR CASTLEWOOD. REPORTED BY DISPATCH.

0700 PM     TSTM WND DMG     3 E CASTLEWOOD          36.88N 82.23W
06/17/2009                   RUSSELL            VA   LAW ENFORCEMENT

            A FEW TREES DOWN BETWEEN CASTLEWOOD AND LEBANON. REPORTED
            BY DISPATCH.

0742 PM     HAIL             FARRAGUT                35.87N 84.18W
06/17/2009  E0.75 INCH       KNOX               TN   TRAINED SPOTTER

            THREE QUARTER INCH HAIL IN FARRAGUT. REPORTED BY OFF-DUTY
            ASOS OBSERVER.

0742 PM     HAIL             SEVIERVILLE             35.89N 83.58W
06/17/2009  E0.75 INCH       SEVIER             TN   AMATEUR RADIO

            PENNY SIZED HAIL ON PINE HOLLOW WAY IN EAST SEVIERVILLE.
            REPORTED BY HAM RADIO OPERATOR.

&&

FERRELL

Local storm report, Jun 17, 8:06 PM EDT, 1 hour 43 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MORRISTOWN TN
806 PM EDT WED JUN 17 2009

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

0657 PM     TSTM WND DMG     MOUNTAIN CITY           36.47N 81.81W
06/17/2009                   JOHNSON            TN   LAW ENFORCEMENT

            SEVERAL TREES AND POWER LINES DOWN IN THE MOUNTAIN CITY
            AREA. REPORTED BY DISPATCH.

&&

FERRELL

Local storm report, Jun 17, 8:17 PM EDT, 1 hour 32 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MORRISTOWN TN
817 PM EDT WED JUN 17 2009

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

0815 PM     HAIL             MARYVILLE               35.75N 83.97W
06/17/2009  E0.75 INCH       BLOUNT             TN   AMATEUR RADIO

            PENNY SIZE HAIL AT WAL MART ON HWY 411.

&&

FERRELL

Local storm report, Jun 17, 8:26 PM EDT, 1 hour 23 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MORRISTOWN TN
826 PM EDT WED JUN 17 2009

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

0823 PM     HAIL             KNOXVILLE               35.97N 83.95W
06/17/2009  E0.75 INCH       KNOX               TN   TRAINED SPOTTER

            PENNY AND DIME SIZE HAIL ON MONTVALE RD.

&&

FERRELL

Local storm report, Jun 17, 9:17 PM EDT, 32 minutes before

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Local storm report, Jun 17, 9:29 PM EDT, 20 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 17, 8:10 PM EDT	Areal Flood Advisory	MRX	Blount, Cocke, Knox, Loudon, Monroe, Roane and 1 more	3 hr
Jun 17, 8:13 PM EDT	Severe Thunderstorm Warning	MRX	Blount, Loudon, McMinn, Monroe, Polk	47 min
Jun 17, 8:29 PM EDT	Severe Thunderstorm Warning	MRX	Anderson, Blount, Knox, Loudon, Morgan, Roane and 1 more	61 min
Jun 17, 8:42 PM EDT	Flash Flood Warning	MRX	Anderson, Blount, Knox, Loudon, Roane, Sevier	3 hr
Jun 17, 8:47 PM EDT	Severe Thunderstorm Warning	MRX	Blount, Loudon, Monroe, Polk	58 min
Jun 17, 10:16 PM EDT	Severe Thunderstorm Warning	MRX	Bradley, McMinn, Monroe, Polk	59 min
Jun 17, 11:17 PM EDT	Severe Thunderstorm Warning	MRX	McMinn, Monroe, Polk	44 min
Jun 18, 12:52 PM EDT	Severe Thunderstorm Warning	MRX	Morgan, Scott	53 min
Jun 18, 1:17 PM EDT	Severe Thunderstorm Warning	MRX	Anderson, Campbell	58 min
Jun 18, 1:42 PM EDT	Severe Thunderstorm Warning	MRX	Morgan, Scott	63 min
Jun 18, 1:49 PM EDT	Severe Thunderstorm Warning	MRX	Knox, Union	56 min
Jun 18, 2:07 PM EDT	Severe Thunderstorm Warning	MRX	Claiborne, Hancock, Hawkins	53 min
Jun 18, 2:13 PM EDT	Severe Thunderstorm Warning	MRX	Anderson, Campbell	32 min
Jun 18, 2:17 PM EDT	Severe Thunderstorm Warning	MRX	Loudon, Roane	58 min
Jun 18, 2:26 PM EDT	Severe Thunderstorm Warning	MRX	Blount, Sevier	64 min
Jun 18, 2:30 PM EDT	Severe Thunderstorm Warning	MRX	Grainger, Hamblen, Jefferson	60 min
Jun 18, 2:45 PM EDT	Severe Thunderstorm Warning	MRX	Knox	30 min
Jun 18, 2:45 PM EDT	Severe Thunderstorm Warning	MRX	Greene, Hawkins, Sullivan, Washington	60 min
Jun 18, 2:54 PM EDT	Severe Thunderstorm Warning	MRX	Monroe	66 min
Jun 18, 3:08 PM EDT	Severe Thunderstorm Warning	MRX	Cocke	52 min
Jun 18, 3:13 PM EDT	Severe Thunderstorm Warning	MRX	Loudon	32 min
Jun 18, 3:14 PM EDT	Severe Thunderstorm Warning	MRX	Carter, Greene, Johnson, Sullivan, Unicoi, Washington	45 min
Jun 18, 3:30 PM EDT	Severe Thunderstorm Warning	MRX	Blount, Sevier	30 min
Jun 18, 1:38 PM EDT	Severe Thunderstorm Warning	MRX	Lee, Scott, Wise, City of Norton	52 min
Jun 18, 2:28 PM EDT	Severe Thunderstorm Warning	MRX	Lee, Russell, Scott, Washington, Wise, City of Bristol and 1 more	62 min
Jun 17, 10:48 PM EDT	Severe Thunderstorm Warning	MRX	Cherokee, Clay	57 min
Jun 18, 3:47 PM EDT	Severe Thunderstorm Warning	MRX	Cherokee, Clay	41 min

Nearby

Severe Thunderstorm Warnings in Tennessee, 2009 Severe Thunderstorm Warnings in North Carolina, 2009 Every severe thunderstorm warning in 2009

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.