Alert archive / Tennessee / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 186, NWS Morristown, TN

June 17, 2009Claiborne County, Tennessee

NWS Morristown, TN issued this severe thunderstorm warning at Jun 17, 2009, 4:24 PM EDT for Claiborne County, Tennessee. It was in force for 66 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, 4:24 PM EDT (20:24 UTC)
Expired: Jun 17, 2009, 5:30 PM EDT
In force: 66 min
Issued by: NWS Morristown, TN
Area: Storm-based polygon

County Claiborne County, TN

The radar

The Knoxville radar (KMRX), 42 km from the middle of the area, began a volume at 20:27 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

Nashville Metro, TN (KBNA), launched 12:00Z, 8.4 hours before the alert went out and 266 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: 2932 J/kg
Mixed-layer CIN: -23 J/kg
Mixed-layer LCL: 772 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 101 m²/s²
0-3 km storm-relative helicity: 112 m²/s²
Significant tornado parameter: 1.2
Supercell composite: 6.2

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, 3:27 PM EDT, 57 minutes earlier.

Area forecast discussion, Jun 17, 3:27 PM EDT, 57 minutes before

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

.DISCUSSION...LATEST SURFACE ANALYSIS STILL SHOWS A STATIONARY
BOUNDARY ACROSS NORTHEAST TENNESSEE INTO SOUTHEAST KENTUCKY. THIS
BOUNDARY WILL REMAIN ACROSS THE AREA THROUGH THIS EVENING. A SERIES
OF SHORT WAVES MOVING SOUTHEAST ACROSS LOWER OHIO VALLEY AND TENNESSEE
VALLEY AND SOUTHERN APPALACHIANS LATE TODAY AND TONIGHT. SOUNDINGS
SHOW AIRMASS VERY UNSTABLE AND MOIST WITH HIGH CAPES AND HIGH PWS
VALUES. SCATTERED TO BROKEN CONVECTION SHOULD CONTINUE THE NEXT
SEVERAL HOURS AND PRODUCE TORRENTIAL RAINS WITH THE BOUNDARY ACTING
AS A FOCUS FOR TRAINING. FLOOD WATCH TO CONTINUE THROUGH MOST OF
THE EVENING WITH FOR THE NORTHERN HALF OF THE AREA. THINK ACTIVITY
LATER TONIGHT WILL STAY ALONG THE OHIO RIVER.

THURSDAY RIDGE BEGINS TO STRENGTHEN ACROSS SW HALF OF FORECAST
AREA BUT SHORT WAVES MOVING AROUND RIDGE WILL KEEP A CHANCE OF
SHOWERS AND THUNDERSTORMS ACROSS MAINLY NE TN AND SW VA NORTH OF
INTERSTATE 40. DAMAGING WINDS AND LARGE HAIL POSSIBLE DURING THE
AFTERNOON AND EVENING HOURS AS AFTERNOON HEATING PRODUCES A
UNSTABLE ATMOSPHERE ONCE AGAIN. HIGHS EXPECTED TO REACH THE LOWER
TO MID 90S SW AND UPPER 80S NE. RIDGE STRENGTHENS MORE FRIDAY AND
HAVE KEPT FRIDAY DRY FOR NOW. SATURDAY TROUGH MOVES INTO EASTERN
GREAT LAKES AND UPPER OHIO VALLEY BRINGING COLD FRONT INTO FORECAST
AREA WITH CHANCE OF SHOWERS AND THUNDERSTORMS. UPPER RIDGE GETS
PUSHED TO THE SOUTH AND SOUTHWEST. THE FRONT IS EXPECTED TO MOVE
FAR ENOUGH SOUTH AND WEST FOR CONDITIONS TO IMPROVE AND EXPECT
MAINLY DIURNAL AFTERNOON AND EVENING THUNDERSTORMS CONCENTRATED IN
THE HIGHER ELEVATIONS.

&&

.PRELIMINARY POINT TEMPS/POPS...
CHATTANOOGA AIRPORT, TN             70  95  71  96  71 /  40  20  10  10  10
KNOXVILLE MCGHEE TYSON AIRPORT, TN  68  92  71  94  71 /  50  20  10  10  10
OAK RIDGE, TN                       68  93  70  94  71 /  50  20  10  10  20
TRI CITIES AIRPORT, TN              63  88  65  92  65 /  50  30  20  10  10

&&

.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, 5 hours 31 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, 2:26 PM EDT, 1 hour 58 minutes before

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Local storm report, Jun 17, 2:50 PM EDT, 1 hour 34 minutes before

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

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

0220 PM     TSTM WND DMG     2 SE ROGERSVILLE        36.39N 82.98W
06/17/2009                   HAWKINS            TN   LAW ENFORCEMENT

            ONE TREE DOWN ON MCKINNEY CHAPEL ROAD. REPORTED BY
            DISPATCH.

&&

FERRELL

Local storm report, Jun 17, 2:54 PM EDT, 1 hour 30 minutes before

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

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

0220 PM     TSTM WND DMG     DANDRIDGE               36.02N 83.42W
06/17/2009                   JEFFERSON          TN   LAW ENFORCEMENT

            TWO TREES DOWN IN DANDRIDGE. REPORTED BY DISPATCH.

&&

FERRELL

Local storm report, Jun 17, 3:04 PM EDT, 1 hour 20 minutes before

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

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

0220 PM     TSTM WND DMG     KNOXVILLE               35.97N 83.95W
06/17/2009                   KNOX               TN   LAW ENFORCEMENT

            SEVERAL TREES AND TRAFFIC LIGHTS DOWN IN KNOXVILLE.
            REPORTED BY DISPATCH.

&&

FERRELL

Local storm report, Jun 17, 3:19 PM EDT, 1 hour 5 minutes before

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

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

0312 PM     TSTM WND DMG     JONESBOROUGH            36.29N 82.48W
06/17/2009                   WASHINGTON         TN   LAW ENFORCEMENT

            NUMEROUS TREES DOWN COUNTYWIDE. REPORTED BY DISPATCH.

&&

FERRELL

Local storm report, Jun 17, 4:23 PM EDT, 1 minute before

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

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

0400 PM     TSTM WND DMG     MAYNARDVILLE            36.25N 83.81W
06/17/2009                   UNION              TN   LAW ENFORCEMENT

            FOUR TREES AND MANY POWERLINES DOWN COUNTYWIDE. REPORTED
            BY DISPATCH.

&&

FERRELL

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 16, 8:17 PM EDT	Tornado Warning	MRX	Johnson	43 min
Jun 17, 4:37 AM EDT	Severe Thunderstorm Warning	MRX	Claiborne, Hancock	53 min
Jun 17, 5:01 AM EDT	Tornado Warning	MRX	Claiborne, Grainger, Hancock	44 min
Jun 17, 5:21 AM EDT	Severe Thunderstorm Warning	MRX	Grainger, Hamblen, Hancock, Hawkins	54 min
Jun 17, 5:49 AM EDT	Severe Thunderstorm Warning	MRX	Greene	56 min
Jun 17, 6:21 AM EDT	Severe Thunderstorm Warning	MRX	Cocke, Greene	24 min
Jun 17, 6:33 AM EDT	Severe Thunderstorm Warning	MRX	Cocke, Greene, Hamblen, Jefferson	42 min
Jun 17, 6:38 AM EDT	Areal Flood Advisory	MRX	Cocke, Grainger, Greene, Hamblen, Hancock, Hawkins and 4 more	3 hr
Jun 17, 7:13 AM EDT	Severe Thunderstorm Warning	MRX	Cocke, Greene	47 min
Jun 17, 7:15 AM EDT	Severe Thunderstorm Warning	MRX	Cocke	18 min
Jun 17, 7:45 AM EDT	Flash Flood Warning	MRX	Greene	82 min
Jun 17, 10:01 AM EDT	Flash Flood Watch	MRX	Anderson, Blount, Campbell, Carter, Claiborne, Cocke and 17 more	13 hr
Jun 17, 1:25 PM EDT	Severe Thunderstorm Warning	MRX	Grainger, Jefferson, Knox, Union	65 min
Jun 17, 2:05 PM EDT	Severe Thunderstorm Warning	MRX	Jefferson	55 min
Jun 17, 2:06 PM EDT	Severe Thunderstorm Warning	MRX	Greene, Hamblen, Hawkins	54 min
Jun 17, 2:12 PM EDT	Severe Thunderstorm Warning	MRX	Knox, Sevier	63 min
Jun 17, 2:26 PM EDT	Severe Thunderstorm Warning	MRX	Carter, Johnson, Unicoi	64 min
Jun 17, 2:30 PM EDT	Severe Thunderstorm Warning	MRX	Cocke	44 min
Jun 17, 2:42 PM EDT	Severe Thunderstorm Warning	MRX	Carter, Greene, Unicoi, Washington	63 min
Jun 17, 2:54 PM EDT	Severe Thunderstorm Warning	MRX	Carter, Johnson, Sullivan	51 min
Jun 17, 3:17 PM EDT	Severe Thunderstorm Warning	MRX	Carter, Johnson, Sullivan	58 min
Jun 17, 3:28 PM EDT	Severe Thunderstorm Warning	MRX	Campbell, Claiborne, Union	62 min
Jun 17, 3:29 PM EDT	Severe Thunderstorm Warning	MRX	Carter, Unicoi	29 min
Jun 17, 3:43 PM EDT	Severe Thunderstorm Warning	MRX	Johnson	32 min
Jun 17, 4:34 PM EDT	Severe Thunderstorm Warning	MRX	Grainger, Hamblen, Hancock, Hawkins	56 min
Jun 17, 4:38 PM EDT	Severe Thunderstorm Warning	MRX	Campbell, Scott	52 min
Jun 17, 4:53 PM EDT	Areal Flood Advisory	MRX	Campbell, Claiborne, Grainger, Hamblen, Jefferson, Scott and 1 more	3 hr
Jun 17, 5:04 PM EDT	Severe Thunderstorm Warning	MRX	Grainger, Union	56 min
Jun 17, 5:26 PM EDT	Severe Thunderstorm Warning	MRX	Campbell, Claiborne	64 min
Jun 17, 5:29 PM EDT	Flash Flood Warning	MRX	Campbell, Claiborne, Union	3 hr
Jun 17, 5:54 PM EDT	Severe Thunderstorm Warning	MRX	Grainger, Hamblen, Jefferson	66 min
Jun 17, 6:34 PM EDT	Flash Flood Warning	MRX	Grainger, Hamblen, Jefferson, Union	3 hr
Jun 17, 6:37 PM EDT	Severe Thunderstorm Warning	MRX	Cocke, Sevier	53 min
Jun 17, 6:44 PM EDT	Severe Thunderstorm Warning	MRX	Anderson, Knox, Morgan, Roane	61 min
Jun 17, 6:55 PM EDT	Severe Thunderstorm Warning	MRX	Johnson	50 min
Jun 17, 7:12 PM EDT	Severe Thunderstorm Warning	MRX	Knox	63 min
Jun 17, 7:21 PM EDT	Tornado Warning	MRX	Campbell, Scott	39 min
Jun 17, 7:29 PM EDT	Severe Thunderstorm Warning	MRX	Blount, Loudon	61 min
Jun 17, 7:32 PM EDT	Severe Thunderstorm Warning	MRX	Cocke, Sevier	58 min
Jun 17, 7:33 PM EDT	Severe Thunderstorm Warning	MRX	Johnson	57 min
Jun 17, 7:44 PM EDT	Severe Thunderstorm Warning	MRX	Anderson, Knox, Morgan, Roane	61 min
Jun 16, 8:11 PM EDT	Severe Thunderstorm Warning	MRX	Russell	34 min
Jun 17, 12:14 PM EDT	Areal Flood Advisory	MRX	Russell, Wise	2 hr
Jun 17, 4:43 PM EDT	Severe Thunderstorm Warning	MRX	Russell, Wise	62 min
Jun 17, 5:44 PM EDT	Severe Thunderstorm Warning	MRX	Russell, Washington	61 min
Jun 17, 6:04 PM EDT	Areal Flood Advisory	MRX	Russell, Washington, Wise, City of Bristol, City of Norton	3 hr
Jun 17, 6:16 PM EDT	Severe Thunderstorm Warning	MRX	Russell, Scott, Washington, Wise, City of Norton	29 min
Jun 17, 6:49 PM EDT	Severe Thunderstorm Warning	MRX	Russell, Scott, Washington, City of Bristol	41 min
Jun 17, 7:30 PM EDT	Flash Flood Warning	MRX	Russell, Washington, City of Bristol	3 hr
Jun 17, 7:46 PM EDT	Flash Flood Warning	MRX	Wise, City of Norton	3 hr

Nearby

Severe Thunderstorm Warnings in Tennessee, 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.