Alert archive / Tennessee / Severe Thunderstorm Warnings in 1999
Severe Thunderstorm Warning 232, NWS Nashville, TN
NWS Nashville, TN issued this severe thunderstorm warning at Aug 12, 1999, 4:43 PM CDT for Davidson County, Tennessee. It was in force for 32 min. 2 reports came from inside the area while it was in force.
The area
The counties it named, with what was reported inside it.
The facts
- Issued
- Aug 12, 1999, 4:43 PM CDT (21:43 UTC)
- Expired
- Aug 12, 1999, 5:15 PM CDT
- In force
- 32 min
- Issued by
- NWS Nashville, TN
- Area
- Whole counties
County Davidson County, TN
The radar
The Nashville radar (KOHX), 21 km from the middle of the area, began a volume at 21:46 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Aug 12, 4:55 PM CDT | Hail 1.75 | Donelson, TN | Golf ball size hail covering the ground. |
| Aug 12, 4:55 PM CDT | Thunderstorm Wind | Nashville, TN | Newspaper article stated Antioch Middle School, Una Elementary School, and Donelson's Two Rivers Middle School sustained water damage after winds lifted the roofs, allowing rain to seep in. Also, 5 private planes were damaged, 3 of them heavily, on the ramp |
NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.
The nearest sounding before it
Nashville Metro, TN (KBNA), launched 12:00Z, 9.7 hours before the alert went out and 17 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
- 1559 J/kg
- Mixed-layer CIN
- -64 J/kg
- Mixed-layer LCL
- 988 m above ground
- 0-6 km bulk shear
- 17 kt
- 0-1 km storm-relative helicity
- 94 m²/s²
- 0-3 km storm-relative helicity
- 132 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 2.2
The text
The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.
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 Aug 12, 1:44 PM CDT, 2 hours 59 minutes earlier.
Area forecast discussion, Aug 12, 1:44 PM CDT, 2 hours 59 minutes before
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE NASHVILLE TN 144 PM CDT THU AUG 12 1999 ...CURRENT WEATHER... 1800 UTC SURFACE PLOT SHOWS SURFACE BOUNDARY EXTENDING ACROSS SOUTHERN KENTUCKY AND INTO THE NORTHERN CUMBERLAND PLATEAU. DEW POINTS ACROSS THE NASHVILLE COUNTY WARNING AREA ARE STILL BETWEEN 70 AND 75 DEGREES WITH TEMPERATURES CONTINUING TO RISE THROUGH THE 90S TO NEAR 100 IN SOME PLACES. WSR-88D SHOWS WIDELY SCATTERED SHOWERS AND THUNDERSTORMS DEVELOPING OVER SOUTHWEST MIDDLE TENNESSEE...WHERE SURFACE HEATING IS THE GREATEST. EXPECT THIS DEVELOPMENT TO CONTINUE ACROSS THE REMAINDER OF THE MID STATE AS THE AFTERNOON PROGRESSES. ...MODEL DISCUSSION... ETA AND NGM ARE IN GOOD AGREEMENT REGARDING THE MOVEMENT OF THE NEXT SURFACE SYSTEM. AVN SEEMS ABOUT 6 HOURS BEHIND...SO WILL FAVOR AN ETA/NGM BLEND THIS FORECAST. SURFACE FRONT SHOULD PASS THROUGH NASHVILLE AROUND 0600 UTC SATURDAY WITH BEST CHANCE FOR THUNDERSTORMS TOMORROW AFTERNOON. MODEL TIME SECTION PLOTS FOR BOTH NASHVILLE AND CROSSVILLE SHOW STRONGEST LIFT CENTERED BETWEEN 1800 AND 2100 UTC TOMORROW. MIDDLE LEVELS WILL EXPERIENCE SIGNIFICANT MOISTURE ADVECTION BY THIS TIME. MOST OF THE PRECIPITATION SHOULD END BY TOMORROW EVENING...AND NORTHWESTERLY FLOW BEHIND THE FRONT WILL BRING COOLER TEMPERATURES TO MIDDLE TENNESSEE. ...FORECAST DISCUSSION... FWC/FAN TEMPERATURES ARE VERY CLOSE THROUGH THE FORECAST PERIOD... AND IN AGREEMENT WITH VALUES GIVEN BY THE MASSIE/ROSE LOW LEVEL THICKNESS SCHEME. WILL GO WITH A BLEND OF THE FWC/FAN TEMPERATURES AND POPS. BNA BU 075/095 072/090 067 08242 CSV BU 069/090 068/085 062 08243 .BNA...NONE. 08
In the hours before
Local storm report, Aug 12, 4:40 PM CDT, 3 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NASHVILLE TN
440 PM CDT THU AUG 12 1999
TIME(CDT) .....CITY LOCATION..... STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0240 PM MCEWEN TN WIND DAMAGE
08/12/99 HUMPHREYS SMALL TREES DOWN
NEAR MCEWEN. REPORT BY
HWY DEPT.
0251 PM TN WIND DAMAGE
08/12/99 GILES TREES DOWN ALL OVER THE
COUNTY. REPORT BY SHERIFFS
OFFICE.
0426 PM SANTA FE TN WIND DAMAGE
08/12/99 MAURY TREES DOWN NEAR HWY 7. REPORT
BY SHERIFFS OFFICE.
0440 PM NORTHERN PART TN WIND DAMAGE
08/12/99 CHEATHAM SHERIFFS OFFICE REPORTED
TREES DOWN.
END/ORCHANIANLocal storm report, Aug 12, 4:40 PM CDT, 3 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NASHVILLE TN
440 PM CDT THU AUG 12 1999
TIME(CDT) .....CITY LOCATION..... STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0240 PM MCEWEN TN WIND DAMAGE
08/12/99 HUMPHREYS SMALL TREES DOWN
NEAR MCEWEN. REPORT BY
HWY DEPT.
0251 PM TN WIND DAMAGE
08/12/99 GILES TREES DOWN ALL OVER THE
COUNTY. REPORT BY SHERIFFS
OFFICE.
0426 PM SANTA FE TN WIND DAMAGE
08/12/99 MAURY TREES DOWN NEAR HWY 7. REPORT
BY SHERIFFS OFFICE.
0440 PM NORTHERN PART TN WIND DAMAGE
08/12/99 CHEATHAM SHERIFFS OFFICE REPORTED
TREES DOWN.
END/ORCHANIANThe office that day
Everything else NWS Nashville, TN issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 12, 2:38 PM CDT | Severe Thunderstorm Warning | OHX | Humphreys | 52 min |
| Aug 12, 2:48 PM CDT | Severe Thunderstorm Warning | OHX | Giles | 42 min |
| Aug 12, 3:16 PM CDT | Severe Thunderstorm Warning | OHX | Dickson | 44 min |
| Aug 12, 3:23 PM CDT | Severe Thunderstorm Warning | OHX | Humphreys | 52 min |
| Aug 12, 3:38 PM CDT | Severe Thunderstorm Warning | OHX | Bedford | 37 min |
| Aug 12, 4:10 PM CDT | Severe Thunderstorm Warning | OHX | Franklin, Moore | 50 min |
| Aug 12, 4:11 PM CDT | Severe Thunderstorm Warning | OHX | Cheatham | 49 min |
| Aug 12, 4:14 PM CDT | Severe Thunderstorm Warning | OHX | Maury | 31 min |
| Aug 12, 4:15 PM CDT | Severe Thunderstorm Warning | OHX | Rutherford, Williamson | 45 min |
| Aug 12, 4:21 PM CDT | Severe Thunderstorm Warning | OHX | Cannon | 39 min |
| Aug 12, 4:44 PM CDT | Severe Thunderstorm Warning | OHX | Robertson | 31 min |
| Aug 12, 4:48 PM CDT | Tornado Warning | OHX | Rutherford | 27 min |
| Aug 12, 4:56 PM CDT | Severe Thunderstorm Warning | OHX | Wilson | 34 min |
| Aug 12, 5:08 PM CDT | Severe Thunderstorm Warning | OHX | Sumner | 37 min |
| Aug 12, 5:17 PM CDT | Severe Thunderstorm Warning | OHX | Davidson | 13 min |
| Aug 12, 5:22 PM CDT | Severe Thunderstorm Warning | OHX | Robertson | 23 min |
| Aug 12, 5:27 PM CDT | Severe Thunderstorm Warning | OHX | Wilson | 33 min |
| Aug 12, 5:49 PM CDT | Severe Thunderstorm Warning | OHX | Sumner, Trousdale | 26 min |
| Aug 12, 5:53 PM CDT | Severe Thunderstorm Warning | OHX | Hickman, Lewis | 37 min |
| Aug 12, 5:53 PM CDT | Severe Thunderstorm Warning | OHX | Giles, Lawrence | 37 min |
| Aug 12, 6:33 PM CDT | Flash Flood Warning | OHX | Lawrence, Lewis | 117 min |
| Aug 12, 6:36 PM CDT | Severe Thunderstorm Warning | OHX | Hickman, Lewis, Maury | 34 min |
Nearby
Severe Thunderstorm Warnings in Tennessee, 1999Every severe thunderstorm warning in 1999
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.