Alert archive / Tennessee / Severe Thunderstorm Warnings in 2009
Severe Thunderstorm Warning 250, NWS Nashville, TN
NWS Nashville, TN issued this severe thunderstorm warning at Jul 4, 2009, 7:53 PM CDT for 4 counties in Tennessee. It was in force for 37 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
- Jul 4, 2009, 7:53 PM CDT (00:53 UTC)
- Expired
- Jul 4, 2009, 8:30 PM CDT
- In force
- 37 min
- Issued by
- NWS Nashville, TN
- Area
- Storm-based polygon
Counties Cheatham County, TN, Davidson County, TN, Robertson County, TN, Sumner County, TN
The radar
The Nashville radar (KOHX), 24 km from the middle of the area, began a volume at 00:54 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 |
|---|---|---|---|
| Jul 4, 5:56 PM CDT | Severe Thunderstorm Watch | SPC | 3 hr |
The nearest sounding before it
Nashville Metro, TN (KBNA), launched 00:00Z, 0.9 hours before the alert went out and 31 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
- 238 J/kg
- Mixed-layer CIN
- -104 J/kg
- Mixed-layer LCL
- 1204 m above ground
- 0-6 km bulk shear
- 28 kt
- 0-1 km storm-relative helicity
- 201 m²/s²
- 0-3 km storm-relative helicity
- 297 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 0.7
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 Jul 4, 7:45 PM CDT, 8 minutes earlier.
Area forecast discussion, Jul 4, 7:45 PM CDT, 8 minutes before
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</html>Hazardous weather outlook, Jul 4, 5:23 AM CDT, 14 hours 30 minutes before
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE NASHVILLE TN 523 AM CDT SAT JUL 4 2009 TNZ005>011-022>034-056>066-075-077>080-093>095-051030- 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- 523 AM CDT SAT JUL 4 2009 THIS HAZARDOUS WEATHER OUTLOOK IS FOR MIDDLE TENNESSEE. .DAY ONE...TODAY AND TONIGHT A COLD FRONT WILL APPROACH THE MID STATE THIS EVENING...AND SWING THROUGH THE AREA TONIGHT AND SUNDAY. THUNDERSTORMS WILL BECOME LIKELY...AND A FEW MAY BECOME SEVERE...WITH DAMAGING WINDS AND HAIL. HEAVY RAINFALL WILL ALSO OCCUR...WITH AVERAGE RAIN AMOUNTS BETWEEN ONE AND ONE AND A HALF INCHES. LOCALIZED FLOOD PROBLEMS MAY DEVELOP DURING THUNDERSTORM DOWNPOURS. .DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY THUNDERSTORMS WILL CONTINUE TO PRODUCE LOCALLY HEAVY RAINFALL ON SUNDAY...AND A FEW STORMS COULD BECOME SEVERE...ESPECIALLY ACROSS THE SOUTHEASTERN HALF OF THE MID STATE. .SPOTTER INFORMATION STATEMENT... SPOTTER AND EMERGENCY MANAGER ACTIVATION MAY BE NEEDED. 19
In the hours before
Special weather statement, Jul 4, 5:51 PM CDT, 2 hours 2 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE NASHVILLE TN 551 PM CDT SAT JUL 4 2009 TNZ007-008-026>028-059-050100- ROBERTSON-SUMNER-CHEATHAM-DAVIDSON-WILSON-WILLIAMSON- INCLUDING THE CITIES OF...SPRINGFIELD...GALLATIN...ASHLAND CITY... KINGSTON SPRINGS...NASHVILLE...LEBANON...MOUNT JULIET... FRANKLIN...BRENTWOOD 551 PM CDT SAT JUL 4 2009 ...STORMS APPROACHING DOWNTOWN NASHVILLE... THE LEADING EDGE OF A CLUSTER OF THUNDERSTORMS HAS MOVED INTO WESTERN DAVIDSON COUNTY AT 550 PM CDT. A STORM OR TWO COULD BE STRONG WITH WIND GUSTS TO 35 MPH AND SMALL HAIL...ALONG WITH DANGEROUS CLOUD TO GROUND LIGHTNING STRIKES. STORMS ARE MOVING EAST AT 35 MPH...AND WILL BE IN THE NASHVILLE AREA FOR THE NEXT 1 TO 2 HOURS. BOYD
Special weather statement, Jul 4, 6:22 PM CDT, 1 hour 31 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE NASHVILLE TN 622 PM CDT SAT JUL 4 2009 TNZ005-050030- STEWART- INCLUDING THE CITY OF...DOVER 622 PM CDT SAT JUL 4 2009 ...STRONG TO SEVERE THUNDERSTORMS JUST TO THE NORTHWEST OF STEWART COUNTY... A LINE OF STRONG TO SEVERE HAVE MOVED DOWN FROM WESTERN KENTUCKY...AND AT 615 PM CDT THE LEADING EDGE EXTENDED FROM CLIFTY TO CADIZ TO AURORA AND THEN TO JUST WEST OF MURRAY. STORMS ALONG THIS LINE HAVE PRODUCED SEVERAL SEVERE THUNDERSTORM WARNINGS FROM OUR NEIGHBORING WEATHER SEVICE OFFICE IN PADUCAH. SOME ROTATION WAS INDICATED EARLIER IN A STORM THAT MOVED INTO TRIGG COUNTY. THE LINE OF STORMS WILL ENTER NORTHWEST STEWART COUNTY SHORTLY...IN THE LAND BETWEEN THE LAKES AREA. BOATERS ALONG THE TENNESSEE AND CUMBERLAND RIVERS ARE URGED TO HEAD FOR SHORE AT THIS TIME. CAMPERS SHOULD PREPARE FOR GUSTY WINDS...HAIL AND FREQUENT CLOUD TO GROUND LIGHTNING STRIKES. REMEMBER...MOVE INDOORS WHEN THUNDER ROARS. BOYD
Special weather statement, Jul 4, 7:06 PM CDT, 47 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE NASHVILLE TN 706 PM CDT SAT JUL 4 2009 TNZ005-006-050115- STEWART-MONTGOMERY- INCLUDING THE CITIES OF...DOVER...CLARKSVILLE 706 PM CDT SAT JUL 4 2009 ...TORNADO WARNING REMAINS IN EFFECT FOR STEWART AND WESTERN MONTGOMERY COUNTIES UNTIL 730 PM CDT... CLASSIC BOW ECHO MOVING EASTWARD AT 40 MPH THROUGH EASTERN STEWART COUNTY AT 705 PM...WITH COMMA HEAD JUST NORTH OF KENTUCKY BORDER. GOOD REAR INFLOW ON BACKSIDE OF BOW WILL PRODUCE DAMAGING WINDS ALONG ITS PATH. BOYD
Local storm report, Jul 4, 7:11 PM CDT, 42 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NASHVILLE TN
711 PM CDT SAT JUL 04 2009
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0705 PM TORNADO 6 W CLARKSVILLE 36.56N 87.46W
07/04/2009 MONTGOMERY TN LAW ENFORCEMENT
2 TORNADOES REPORTED ON GROUND AT WOODLAWN AND SEVERAL
MILES SOUTHWEST OF WOODLAWN
&&
MGIRODOSpecial weather statement, Jul 4, 7:32 PM CDT, 21 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE NASHVILLE TN 732 PM CDT SAT JUL 4 2009 TNZ006>008-026-050145- MONTGOMERY-ROBERTSON-SUMNER-CHEATHAM- INCLUDING THE CITIES OF...CLARKSVILLE...SPRINGFIELD...GALLATIN... ASHLAND CITY...KINGSTON SPRINGS 732 PM CDT SAT JUL 4 2009 ...TORNADO WARNINGS REMAIN IN EFFECT FOR MONTGOMERY...WESTERN ROBERTSON... NORTHERN CHEATHAM...UNTIL 800 PM CDT... A CLASSIC BOW ECHO IS MOVING THROUGH EASTERN MONTGOMERY COUNTY AT THIS TIME AND WILL MOVE INTO WESTERN ROBERTSON COUNTY BY 745 PM CDT...AND WILL CLIP THE NORTHERN THIRD OF CHEATHAM COUNTY AS IT PASSES. WINDS UPWARDS OF 80 MPH CAN BE EXPECTED ALONG WITH TORNADOES AND LARGE HAIL. HIGH WINDS AND TORNADOES WERE REPORTED IN MONTGOMERY COUNTY AFTER 700 PM CDT WITH THIS STORM SYSTEM. THE SAFEST PLACE TO BE DURING A TORNADO IS IN A BASEMENT. GET UNDER A WORKBENCH OR OTHER PIECE OF STURDY FURNITURE. IF NO BASEMENT IS AVAILABLE...SEEK SHELTER ON THE LOWEST FLOOR OF THE BUILDING IN AN INTERIOR HALLWAY OR ROOM SUCH AS A CLOSET. USE BLANKETS OR PILLOWS TO COVER YOUR BODY AND ALWAYS STAY AWAY FROM WINDOWS. IF IN MOBILE HOMES OR VEHICLES...EVACUATE THEM AND GET INSIDE A SUBSTANTIAL SHELTER. IF NO SHELTER IS AVAILABLE...LIE FLAT IN THE NEAREST DITCH OR OTHER LOW SPOT AND COVER YOUR HEAD WITH YOUR HANDS. A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1100 PM CDT SATURDAY EVENING FOR CENTRAL TENNESSEE. SEVERE THUNDERSTORMS CAN AND OCCASIONALLY DO PRODUCE TORNADOES. BOYD
The office that day
Everything else NWS Nashville, TN issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 4, 7:21 PM CDT | Tornado Warning | OHX | Cheatham, Montgomery, Robertson | 39 min |
| Jul 4, 9:31 PM CDT | Areal Flood Advisory | OHX | Davidson | 3 hr |
| Jul 4, 11:03 PM CDT | Areal Flood Advisory | OHX | Benton, Humphreys | 3 hr |
| Jul 5, 1:05 AM CDT | Flash Flood Warning | OHX | Hickman, Lewis, Perry | 115 min |
| Jul 5, 1:15 AM CDT | Severe Thunderstorm Warning | OHX | Lawrence, Lewis, Perry, Wayne | 30 min |
| Jul 5, 3:19 AM CDT | Areal Flood Advisory | OHX | Giles, Lawrence, Wayne | 3 hr |
| Jul 5, 4:07 AM CDT | Flash Flood Warning | OHX | Hickman, Lewis, Perry, Wayne | 83 min |
| Jul 5, 4:20 AM CDT | Flash Flood Warning | OHX | Lawrence | 85 min |
| Jul 5, 4:53 AM CDT | Areal Flood Advisory | OHX | Giles, Lawrence, Lewis, Marshall, Maury | 3 hr |
| Jul 5, 3:10 PM CDT | Severe Thunderstorm Warning | OHX | Hickman, Maury, Williamson | 35 min |
| Jul 5, 3:39 PM CDT | Areal Flood Advisory | OHX | Lewis, Perry, Wayne | 3 hr |
| Jul 5, 4:14 PM CDT | Flash Flood Warning | OHX | Wayne | 91 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.