Alert archive / Tennessee / Severe Thunderstorm Warnings in 2009
Severe Thunderstorm Warning 71, NWS Morristown, TN
NWS Morristown, TN issued this severe thunderstorm warning at May 8, 2009, 4:20 PM EDT for 4 counties in Tennessee. It was in force for 55 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
- May 8, 2009, 4:20 PM EDT (20:20 UTC)
- Expired
- May 8, 2009, 5:15 PM EDT
- In force
- 55 min
- Issued by
- NWS Morristown, TN
- Area
- Storm-based polygon
Counties Anderson County, TN, Campbell County, TN, Morgan County, TN, Scott County, TN
The radar
The Knoxville radar (KMRX), 88 km from the middle of the area, began a volume at 20:21 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 |
|---|---|---|---|
| May 8, 1:44 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
The nearest sounding before it
Nashville Metro, TN (KBNA), launched 12:00Z, 8.3 hours before the alert went out and 200 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
- 117 J/kg
- Mixed-layer CIN
- -90 J/kg
- Mixed-layer LCL
- 739 m above ground
- 0-6 km bulk shear
- 40 kt
- 0-1 km storm-relative helicity
- 88 m²/s²
- 0-3 km storm-relative helicity
- 73 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
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 May 8, 2:27 PM EDT, 1 hour 53 minutes earlier.
Area forecast discussion, May 8, 2:27 PM EDT, 1 hour 53 minutes before
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE MORRISTOWN TN 227 PM EDT FRI MAY 8 2009 .SHORT TERM (TONIGHT THROUGH SUNDAY NIGHT)...CURRENT SURFACE ANALYSIS SHOWS A LOW PRESSURE SYSTEM STRENGTHENING OVER THE MID MS RIVER VALLEY...WITH A WELL-DEFINED MCS OVER THE WESTERN TN RIVER VALLEY MOVING EASTWARD. MODELS INDICATE THAT A MODERATELY UNSTABLE AIR MASS WILL DEVELOP ACROSS THE TN RIVER VALLEY THIS AFTERNOON... WHICH IS SUPPORTED BY THE SPECIAL BNA SOUNDING TAKEN AT 18Z. THUS... EXPECT THIS MCS TO CONTINUE MOVING INTO THE FORECAST AREA LATER THIS AFTERNOON AND EVENING...BRINGING THE POTENTIAL FOR WIDESPREAD DAMAGING WINDS...LARGE HAIL AND LOCALLY HEAVY RAINFALL. FORECAST HELICITY VALUES ALSO SUPPORT THE POSSIBILITY OF AN ISOLATED TORNADO OR TWO. THIS LOW PRESSURE SYSTEM IS PROGGED TO MOVE NORTHEAST ACROSS THE OHIO RIVER VALLEY TONIGHT...BUT ITS TRAILING COLD FRONT SHOULD ONLY SLOWLY MOVE INTO THE FORECAST AREA AND LINGER THROUGH SATURDAY NIGHT. BY SUNDAY...ANOTHER LOW PRESSURE AREA IS PROGGED TO DEVELOP ALONG THE FRONTAL BOUNDARY OVER THE DEEP SOUTH...RESULTING IN SOME LINGERING CONVECTION ON SUNDAY. WHILE IT APPEARS TO BE A WET WEEKEND FOR ALREADY SATURATED GROUNDS ACROSS THE FORECAST AREA...WILL NOT ISSUE A FLOOD WATCH AT THIS TIME SINCE HEAVY RAINFALL AMOUNTS MAY NOT BE ORGANIZED ENOUGH FOR A WATCH...ALTHOUGH THIS POSSIBILITY WILL NEED TO BE EVALUATED BY LATER SHIFTS AS CONVECTIVE TRENDS BECOME MORE APPARENT. AS FOR TEMPS...GUIDANCE VALUES ARE IN GOOD AGREEMENT THROUGH THE PERIOD AND LOOK REASONABLE. .LONG TERM (MONDAY THROUGH FRIDAY)...SCATTERED SHOWERS WILL BE EXITING THE CWA TO OUR SOUTH DURING THE DAY MONDAY AS A FRONT CONTINUES TO PUSH SOUTH OF THE AREA. HIGH PRESSURE BUILDS IN FOR A DRYING TREND TUESDAY AND WEDNESDAY. CONFIDENCE LOW ON DETAILS...BUT THE NEXT WEATHER SYSTEM SHOULD REACH INTO THE AREA THURSDAY INTO FRIDAY. STAYED NEAR GUIDANCE FOR TEMPS THROUGH THE EXTENDED. && .PRELIMINARY POINT TEMPS/POPS... CHATTANOOGA AIRPORT, TN 64 78 59 72 53 / 70 60 50 50 50 KNOXVILLE AIRPORT, TN 63 77 58 71 51 / 70 60 40 50 50 OAK RIDGE, TN 63 77 58 71 52 / 70 60 40 50 50 TRI CITIES AIRPORT, TN 62 75 57 69 49 / 70 60 40 40 40 && .MRX WATCHES/WARNINGS/ADVISORIES... NC...NONE. TN...NONE. VA...NONE. && DMG/MJB
Hazardous weather outlook, May 8, 9:35 AM EDT, 6 hours 45 minutes before
HAZARDOUS WEATHER OUTLOOK...UPDATED NATIONAL WEATHER SERVICE MORRISTOWN TN 935 AM EDT (835 CDT) FRI MAY 8 2009 NCZ060-061-TNZ012>018-035>047-067>074-081>087-098>102-VAZ001-002- 005-006-008-091000- 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- 935 AM EDT (835 CDT) FRI MAY 8 2009 THIS HAZARDOUS WEATHER OUTLOOK IS FOR EAST TENNESSEE...SOUTHWEST VIRGINIA AND EXTREME SOUTHWEST NORTH CAROLINA. .DAY ONE...TODAY AND TONIGHT ANOTHER COMPLEX OF SHOWERS AND THUNDERSTORMS IS EXPECTED TO MOVE ACROSS THE TENNESSEE RIVER VALLEY THIS AFTERNOON. WITH THIS NEXT SYSTEM...THERE WILL BE THE POTENTIAL FOR WIDESPREAD DAMAGING WINDS...LARGE HAIL...AND LOCALLY HEAVY RAINFALL. IN ADDITION...AN ISOLATED TORNADO OR TWO WILL BE POSSIBLE. .DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY A SERIES OF UPPER LEVEL DISTURBANCES AND FRONTAL BOUNDARIES WILL CREATE A GOOD CHANCE OF MORE SHOWERS AND THUNDERSTORMS THROUGH SUNDAY. NO WIDESPREAD HAZARDOUS WEATHER IS ANTICIPATED...BUT A FEW STRONG TO MARGINALLY SEVERE THUNDERSTORMS COULD DEVELOP JUST ABOUT ANY AFTERNOON OR EVENING THROUGH SUNDAY. SATURATED GROUNDS FROM SEVERAL WET DAYS COULD CAUSE TREES TO FALL MORE EASILY THAN NORMAL. ANY ADDITIONAL SIGNIFICANT RAINFALL MAY CAUSE RIVERS AND STREAMS TO RISE TO NEAR OR ABOVE ABOVE FLOOD STAGE...AND LEAD TO FLASH FLOODING AND POSSIBLE MUD SLIDES. REMAIN ALERT FOR THIS POTENTIALLY DANGEROUS WEATHER...ESPECIALLY IF YOU LIVE NEAR AREA CREEKS AND STREAMS...AND ANY OTHER FLOOD PRONE AREAS. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL LIKELY BE NEEDED THIS AFTERNOON...AND MAY BE NEEDED AT TIMES THROUGH SUNDAY. DMG
In the hours before
Local storm report, May 8, 11:36 AM EDT, 4 hours 44 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MORRISTOWN TN
1136 AM EDT FRI MAY 08 2009
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0715 AM TSTM WND DMG LA FOLLETTE 36.37N 84.13W
05/08/2009 CAMPBELL TN DEPT OF HIGHWAYS
NUMEROUS TREES DOWN COUNTY WIDE. REPORTED BY HWY DEPT.
0810 AM FLASH FLOOD 7 N LA FOLLETTE 36.47N 84.13W
05/08/2009 CAMPBELL TN DEPT OF HIGHWAYS
MUDSLIDE WITH TREES DOWN, DUE TO FLASH FLOODING ON ROCK
CREEK LANE. REPORTED BY HWY DEPT.
0954 AM TSTM WND DMG MADISONVILLE 35.52N 84.36W
05/08/2009 MONROE TN LAW ENFORCEMENT
FEW TREES AND POWER LINES DOWN BETWEEN MADISONVILLE AND
TELLICO PLAINS.
1040 AM TSTM WND DMG 3 NW HAYESVILLE 35.08N 83.86W
05/08/2009 CLAY NC DEPT OF HIGHWAYS
TREE DOWN ON FIRES CREEK RD. REPORTED BY HWY DEPT.
&&
MEPLocal storm report, May 8, 11:38 AM EDT, 4 hours 42 minutes before
PRELIMINARY LOCAL STORM REPORT...SUMMARY
NATIONAL WEATHER SERVICE MORRISTOWN TN
1138 AM EDT FRI MAY 08 2009
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0630 AM HAIL HUNTSVILLE 36.41N 84.49W
05/08/2009 E0.75 INCH SCOTT TN LAW ENFORCEMENT
PENNY SIZE HAIL REPORTED.
0715 AM TSTM WND DMG LA FOLLETTE 36.37N 84.13W
05/08/2009 CAMPBELL TN DEPT OF HIGHWAYS
NUMEROUS TREES DOWN COUNTY WIDE. REPORTED BY HWY DEPT.
0743 AM FLASH FLOOD 2 SE ELGIN 36.31N 84.58W
05/08/2009 SCOTT TN AMATEUR RADIO
SEVERAL INCHES OF WATER COVERING WOLF CREEK ROAD.
0743 AM FLASH FLOOD 5 N HUNTSVILLE 36.49N 84.49W
05/08/2009 SCOTT TN DEPT OF HIGHWAYS
SEVERAL INCHES OF WATER COVERING BUFFALO ROAD.
0810 AM FLASH FLOOD 7 N LA FOLLETTE 36.47N 84.13W
05/08/2009 CAMPBELL TN DEPT OF HIGHWAYS
MUDSLIDE WITH TREES DOWN, DUE TO FLASH FLOODING ON ROCK
CREEK LANE. REPORTED BY HWY DEPT.
0815 AM TSTM WND DMG 2 NE NORRIS 36.23N 84.04W
05/08/2009 ANDERSON TN LAW ENFORCEMENT
NUMEROUS TREES DOWNED BY THUNDERSTORM WINDS.
0815 AM TSTM WND DMG 3 SW MAYNARDVILLE 36.22N 83.84W
05/08/2009 UNION TN LAW ENFORCEMENT
NUMEROUS TREES DOWNED BY THUNDERSTORM WINDS.
0818 AM HAIL ALPHA 36.18N 83.38W
05/08/2009 E0.75 INCH HAMBLEN TN AMATEUR RADIO
PENNY SIZE HAIL AT NATIONAL WEATHER SERVICE.
0840 AM TSTM WND DMG 2 SW KNOXVILLE 35.95N 83.97W
05/08/2009 KNOX TN LAW ENFORCEMENT
A FEW TREES DOWNED BY THUNDERSTORM WINDS.
0841 AM TSTM WND DMG 2 SW MAYNARDVILLE 36.23N 83.83W
05/08/2009 UNION TN LAW ENFORCEMENT
A TREE DOWNED BY THUNDERSTORM WINDS ALONG HIGHWAY 61
WEST.
0930 AM TSTM WND DMG BENTON 35.18N 84.65W
05/08/2009 POLK TN UTILITY COMPANY
FEW POWER LINES DOWN ON MOUNTAIN VIEW ROAD. REPORTED BY
THE ELECTRIC COMPANY.
0954 AM TSTM WND DMG MADISONVILLE 35.52N 84.36W
05/08/2009 MONROE TN LAW ENFORCEMENT
FEW TREES AND POWER LINES DOWN BETWEEN MADISONVILLE AND
TELLICO PLAINS.
1040 AM TSTM WND DMG 3 NW HAYESVILLE 35.08N 83.86W
05/08/2009 CLAY NC DEPT OF HIGHWAYS
TREE DOWN ON FIRES CREEK RD. REPORTED BY HWY DEPT.
&&
MEPThe office that day
Everything else NWS Morristown, TN issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 8, 6:21 AM EDT | Severe Thunderstorm Warning | MRX | Campbell, Scott | 24 min |
| May 8, 6:43 AM EDT | Severe Thunderstorm Warning | MRX | Campbell, Scott | 47 min |
| May 8, 7:30 AM EDT | Flash Flood Warning | MRX | Campbell, Morgan, Scott | 60 min |
| May 8, 8:07 AM EDT | Severe Thunderstorm Warning | MRX | Anderson, Campbell, Grainger, Hamblen, Jefferson, Knox and 1 more | 53 min |
| May 8, 8:24 AM EDT | Severe Thunderstorm Warning | MRX | Anderson, Blount, Knox, Loudon, Roane, Sevier | 51 min |
| May 8, 9:10 AM EDT | Severe Thunderstorm Warning | MRX | Blount, Bradley, Hamilton, Loudon, McMinn, Monroe and 2 more | 50 min |
| May 8, 4:37 PM EDT | Severe Thunderstorm Warning | MRX | McMinn, Monroe | 53 min |
| May 8, 4:46 PM EDT | Severe Thunderstorm Warning | MRX | Blount, Knox, Loudon, McMinn, Monroe | 59 min |
| May 8, 4:58 PM EDT | Tornado Warning | MRX | Blount, McMinn, Monroe | 62 min |
| May 8, 5:15 PM EDT | Tornado Warning | MRX | Morgan, Scott | 60 min |
| May 8, 5:51 PM EDT | Tornado Warning | MRX | Campbell, Claiborne, Union | 54 min |
| May 8, 6:38 PM EDT | Tornado Warning | MRX | Campbell, Claiborne, Grainger, Union | 52 min |
| May 8, 7:26 PM EDT | Tornado Warning | MRX | Claiborne, Grainger, Greene, Hamblen, Hancock, Hawkins | 64 min |
| May 8, 10:11 AM EDT | Severe Thunderstorm Warning | MRX | Cherokee, Clay | 34 min |
Nearby
Severe Thunderstorm Warnings in Tennessee, 2009Every 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.