Alert archive / Tennessee / Severe Thunderstorm Warnings in 2009
Severe Thunderstorm Warning 304, NWS Nashville, TN
NWS Nashville, TN issued this severe thunderstorm warning at Sep 7, 2009, 4:16 PM CDT for 4 counties in Tennessee. It was in force for 19 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
- Sep 7, 2009, 4:16 PM CDT (21:16 UTC)
- Expired
- Sep 7, 2009, 4:35 PM CDT
- In force
- 19 min
- Issued by
- NWS Nashville, TN
- Area
- Storm-based polygon
Counties Benton County, TN, Houston County, TN, Humphreys County, TN, Stewart County, TN
The nearest sounding before it
Nashville Metro, TN (KBNA), launched 12:00Z, 9.3 hours before the alert went out and 113 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
- 1841 J/kg
- Mixed-layer CIN
- -20 J/kg
- Mixed-layer LCL
- 673 m above ground
- 0-6 km bulk shear
- 21 kt
- 0-1 km storm-relative helicity
- 82 m²/s²
- 0-3 km storm-relative helicity
- 74 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.9
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 Nashville, TN wrote its last area forecast discussion before this severe thunderstorm warning went out at Sep 7, 2:00 PM CDT, 2 hours 16 minutes earlier.
Area forecast discussion, Sep 7, 2:00 PM CDT, 2 hours 16 minutes before
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE NASHVILLE TN 200 PM CDT MON SEP 7 2009 .DISCUSSION...UPPER TROUGH MOVING ACROSS MIDDLE TENNESSEE TODAY, WITH SCATTERED CONVECTION FIRING IN THE UNSTABLE AIR MASS THATS IN PLACE. MORNING SOUNDING FROM OHX CAME IN WITH A LIFTED INDEX OF -7.2, CAPE OF 2703 J/KG, AND PRECIPITABLE WATER OF 1.61 INCHES. ATMOSPHERIC MODELS DO SHOW SOME DRYING DURING THE NEXT COUPLE OF DAYS, ALTHOUGH AN UPPER LOW REMAINS IN PLACE JUST TO OUR NORTH, MAINTAINING A NORTHWEST FLOW ALOFT AND KEEPING THE MID-LEVELS UNSTABLE. THUS, AFTERNOON ISOLATED THUNDERSTORMS WILL BE A FIXTURE IN THE PUBLIC FORECAST THROUGH SATURDAY. BY SUNDAY, THE NEXT SURFACE FRONT WILL MAKE ITS WAY INTO THE MISSISSIPPI VALLEY, INCREASING OUR CHANCE OF CONVECTION HERE IN MIDDLE TENNESSEE. OTHERWISE, LOOK FOR LITTLE CHANGE IN TEMPERATURE TRENDS THE NEXT 7 DAYS, WITH READINGS REMAINING CLOSE TO SEASONAL VALUES. && .PRELIMINARY POINT TEMPS/POPS... NASHVILLE 64 85 63 86 / 20 20 10 20 CLARKSVILLE 61 86 58 86 / 20 20 10 20 CROSSVILLE 60 80 60 81 / 20 20 10 20 COLUMBIA 63 86 63 86 / 20 20 10 20 LAWRENCEBURG 63 86 63 87 / 20 20 10 20 WAVERLY 62 86 61 86 / 20 20 10 20 && .OHX WATCHES/WARNINGS/ADVISORIES...NONE. && ROSE
Hazardous weather outlook, Sep 7, 5:03 AM CDT, 11 hours 13 minutes before
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE NASHVILLE TN 503 AM CDT MON SEP 7 2009 TNZ005>011-022>034-056>066-075-077>080-093>095-081000- STEWART-MONTGOMERY-ROBERTSON-SUMNER-MACON-CLAY-PICKETT-BENTON- HOUSTON-HUMPHREYS-DICKSON-CHEATHAM-DAVIDSON-WILSON-TROUSDALE- SMITH-JACKSON-PUTNAM-OVERTON-FENTRESS-PERRY-HICKMAN-LEWIS- WILLIAMSON-MAURY-MARSHALL-RUTHERFORD-CANNON-DEKALB-WHITE- CUMBERLAND-BEDFORD-COFFEE-WARREN-GRUNDY-VAN BUREN-WAYNE-LAWRENCE- GILES- 503 AM CDT MON SEP 7 2009 THIS HAZARDOUS WEATHER OUTLOOK IS FOR MIDDLE TENNESSEE. .DAY ONE...TODAY AND TONIGHT ISOLATED TO SCATTERED THUNDERSTORMS ARE EXPECTED TO AFFECT MIDDLE TENNESSEE THROUGH TONIGHT. DANGEROUS CLOUD TO GROUND LIGHTNING WILL ACCOMPANY ALL THE STORMS...AND A FEW STORMS COULD PRODUCE STRONG WINDS...HAIL...AND LOCALLY VERY HEAVY DOWNPOURS. PATCHY FOG DEVELOPMENT IS AGAIN EXPECTED AFTER MIDNIGHT TONIGHT ACROSS THE ENTIRE MID STATE. MOTORIST SHOULD EXERCISE CAUTION WHILE DRIVING ON AREA ROADWAYS AFTER MIDNIGHT TONIGHT. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... DUE TO THE BRIEF AND ISOLATED NATURE OF POSSIBLE SEVERE WEATHER... SPOTTER ACTIVATION IS NOT ANTICIPATED. 31/JBW
In the hours before
Special weather statement, Sep 7, 10:50 AM CDT, 5 hours 26 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE NASHVILLE TN 1050 AM CDT MON SEP 7 2009 TNZ011-032>034-065-066-071700- PICKETT-PUTNAM-OVERTON-FENTRESS-WHITE-CUMBERLAND- INCLUDING THE CITIES OF...BYRDSTOWN...COOKEVILLE...LIVINGSTON... JAMESTOWN...ALLARDT...SPARTA...CROSSVILLE...FAIRFIELD GLADE 1050 AM CDT MON SEP 7 2009 ...STRONG STORMS ACROSS FENTRESS AND SOUTHEAST OVERTON COUNTIES... AT 1045 AM CDT...STRONG STORMS WERE DEVELOPING IN FENTRESS AND OVERTON COUNTIES...FROM 10 MILES NORTHEAST OF JAMESTOWN TO CRAWFORD IN OVERTON COUNTY. WIND GUSTS TO 40 MPH AND PEA SIZE HAIL CAN BE EXPECTED WITH THE STRONGER STORMS...ALONG WITH DANGEROUS CLOUD TO GROUND LIGHTNING STRIKES. THE STORMS WILL MOVE NORTHEAST AT 20 MPH. BOYD
Special weather statement, Sep 7, 12:28 PM CDT, 3 hours 48 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE NASHVILLE TN 1228 PM CDT MON SEP 7 2009 TNZ032>034-066-071830- PUTNAM-OVERTON-FENTRESS-CUMBERLAND- INCLUDING THE CITIES OF...COOKEVILLE...LIVINGSTON...JAMESTOWN... ALLARDT...CROSSVILLE...FAIRFIELD GLADE 1228 PM CDT MON SEP 7 2009 ...STRONG THUNDERSTORM MOVING ALONG NORTH END OF PLATEAU... AT 1220 PM CDT...A STRONG THUNDERSTORM WAS LOCATED IN SOUTHEAST OVERTON COUNTY FROM NEAR CRAWFORD...SOUTH ALONG STATE ROUTE 164. THIS STORM WAS PRODUCING GUSTY WINDS AROUND 35 MPH...LOCALLY HEAVY DOWNPOURS...AND FREQUENT CLOUD TO GROUND LIGHTNING STRIKES. MOTORISTS ARE URGED TO USE CAUSE IN THIS AREA AND WATCH FOR PONDING OF WATER ON ROADWAYS. IF OUTDOORS...MOVE INDOORS WHEN THUNDERSTORMS APPROACH. THE STORM WILL BE MOVING EAST AT ABOUT 15 MPH...AND WILL MOVE INTO SOUTHERN FENTRESS COUNTY SHORTLY AND THEN ACROSS TOWN OF CLARKRANGE. BOYD
Special weather statement, Sep 7, 2:59 PM CDT, 1 hour 17 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE NASHVILLE TN 259 PM CDT MON SEP 7 2009 TNZ077-079-072100- COFFEE-GRUNDY- INCLUDING THE CITIES OF...TULLAHOMA...MANCHESTER...TRACY CITY... ALTAMONT...COALMONT 259 PM CDT MON SEP 7 2009 ...STRONG STORMS ACROSS SOUTHERN COFFEE AND GRUNDY COUNTIES... AT 3 PM CDT...STRONG THUNDERSTORMS WERE MOVING ACROSS ARNOLD ENGINEERING DEVELOPMENT CENTER WITH FREQUENT CLOUD TO GROUND LIGHTNING STRIKES AND WIND GUSTS TO 35 MPH ALONG WITH PEA SIZE HAIL. STRONG STORMS ALSO EXTENDED ACROSS NORTHERN GRUNDY COUNTY. THESE STORMS ARE BEING MONITORED CLOSELY AND COULD QUICKLY BECOME SEVERE. MOVE INDOORS WHERE THUNDERSTORMS APPROACH. BOYD
The office that day
Everything else NWS Nashville, TN issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 7, 12:47 PM CDT | Severe Thunderstorm Warning | OHX | Cumberland, Fentress, Overton | 42 min |
| Sep 7, 2:31 PM CDT | Severe Thunderstorm Warning | OHX | Cumberland | 44 min |
| Sep 7, 3:05 PM CDT | Severe Thunderstorm Warning | OHX | Grundy | 40 min |
| Sep 7, 5:17 PM CDT | Severe Thunderstorm Warning | OHX | Cannon, DeKalb, Smith, Wilson | 28 min |
| Sep 7, 5:36 PM CDT | Severe Thunderstorm Warning | OHX | Clay, Overton, Pickett | 24 min |
| Sep 7, 5:51 PM CDT | Severe Thunderstorm Warning | OHX | DeKalb | 24 min |
| Sep 7, 6:22 PM CDT | Severe Thunderstorm Warning | OHX | Cannon, DeKalb, Warren | 23 min |
| Sep 7, 6:44 PM CDT | Tornado Warning | OHX | Warren | 31 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.