Alert archive / Tennessee / Severe Thunderstorm Warnings in 2010

Severe Thunderstorm Warning 253, NWS Nashville, TN

July 16, 2010Davidson County, Tennessee

NWS Nashville, TN issued this severe thunderstorm warning at Jul 16, 2010, 6:21 PM CDT for Davidson County, Tennessee. It was in force for 24 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 16, 2010, 6:21 PM CDT (23:21 UTC)
Expired: Jul 16, 2010, 6:45 PM CDT
In force: 24 min
Issued by: NWS Nashville, TN
Area: Storm-based polygon

County Davidson County, TN

The radar

The Nashville radar (KOHX), 21 km from the middle of the area, began a volume at 23:22 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 nearest sounding before it

Nashville Metro, TN (KBNA), launched 12:00Z, 11.4 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.

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: 3144 J/kg
Mixed-layer CIN: -19 J/kg
Mixed-layer LCL: 639 m above ground
0-6 km bulk shear: 11 kt
0-1 km storm-relative helicity: 37 m²/s²
0-3 km storm-relative helicity: 24 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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 Nashville, TN wrote its last area forecast discussion before this severe thunderstorm warning went out at Jul 16, 2:57 PM CDT, 3 hours 24 minutes earlier.

Area forecast discussion, Jul 16, 2:57 PM CDT, 3 hours 24 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NASHVILLE TN
257 PM CDT FRI JUL 16 2010

.DISCUSSION...
SURFACE FRONT WEST TO EAST ACROSS CENTRAL KENTUCKY BACK INTO
MISSOURI AT MID-AFTERNOON WILL SAG SOUTHWARD BEFORE WASHING OUT
OVER THE NEXT 24 HOURS AS HIGH PRESSURE BRIDGES ACROSS. SCATTERED
CONVECTION HAS FIRED THIS AFTERNOON IN MIDDLE TENNESSEE WITH A
MORE ORGANIZED COMPLEX LAYING ACROSS NORTHEAST MISSISSIPPI/NORTHWEST
ALABAMA UP INTO SOUTHWEST MIDDLE TENNESSEE. STEERING FLOW HAS BEEN
VERY WEAK. STORMS APPEAR TO BE PROPAGATING IN ALL DIRECTIONS
INCLUDING WEST. EXPECT WET MICROBURTS UNDERNEATH THE STRONGER
STORMS WITH LOCALLY HEAVY DOWNPOURS IN A SHORT PERIOD OF TIME.

EXPECT SCATTERED SHOWERS AND THUNDERSTORMS IN MID STATE TONIGHT
AND WILL KEEP A LITTLE HIGHER POP OVER THE SOUTH AND EASTERN AREAS
INCLUDING PLATEAU AND THE SAME FOR SATURDAY. WILL DECREASE POPS
SATURDAY NIGHT AND SUNDAY BUT WILL KEEP THE HIGHER POPS BASICALLY
IN THE EAST AND ALONG PLATEAU. STILL LOOKING AT TEMPS IN THE LOW
90S BOTH SATURDAY AND SUNDAY WITH MID 80S ON PLATEAU.

UPPER PATTERN BECOMES ZONAL NORTH HALF OF U.S. AS UPPER RIDGE
ACROSS THE SOUTH HALF BUILDS BACK THIS WAY BEGINNING FIRST OF NEXT
WEEK AND STRENGTHENS OVER TENNESSEE BY MID WEEK. THIS WILL HEAT
TEMPS BACK UP INTO MID AND UPPER 90S. EXPECT ISOLATED AFTERNOON/EARLY
EVENING TSTMS NEXT WEEK BUT LITTLE IN THE WAY OF RELIEF.

SINCE JUNE 1ST NASHVILLE HAS RECORDED 30 DAYS OF MINIMUM TEMPERATURES
70 DEGREES AND ABOVE. THE AVERAGE NUMBER OF DAYS FOR THIS SAME TIME
PERIOD IS 17 DAYS. NASHVILLE ALSO HAD 30 DAYS BACK IN 1952 AND 32
DAYS IN 1943. THE MOST EVER IS 33 DAYS BACK IN 1921. IN 1972 THERE
WERE NO DAYS WITH MINIMUM TEMPERATURES OF 70 DEGREES OR ABOVE FROM
JUNE 1ST TO JULY 15TH.

&&

.PRELIMINARY POINT TEMPS/POPS...
NASHVILLE      74  91  73  92 /  40  50  20  20
CLARKSVILLE    73  91  72  92 /  40  30  20  20
CROSSVILLE     69  85  70  85 /  50  60  30  40
COLUMBIA       73  91  72  91 /  50  50  20  20
LAWRENCEBURG   73  90  72  90 /  50  60  20  40
WAVERLY        74  91  72  92 /  40  40  20  20

&&

.OHX WATCHES/WARNINGS/ADVISORIES...
NONE.
&&

BOYD

Hazardous weather outlook, Jul 16, 5:04 AM CDT, 13 hours 17 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE NASHVILLE TN
504 AM CDT FRI JUL 16 2010

TNZ005>011-022>034-056>066-075-077>080-093>095-171000-
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-DE KALB-WHITE-
CUMBERLAND-BEDFORD-COFFEE-WARREN-GRUNDY-VAN BUREN-WAYNE-LAWRENCE-
GILES-
504 AM CDT FRI JUL 16 2010

THIS HAZARDOUS WEATHER OUTLOOK IS FOR MIDDLE TENNESSEE.

.DAY ONE...TODAY AND TONIGHT

HEAT INDEX VALUES WILL RANGE FROM 100 TO 105 DEGREES ACROSS LOCATIONS
ACROSS MIDDLE TENNESSEE WEST OF THE CUMBERLAND PLATEAU REGION BY
AS EARLY AS NOON TODAY...AND LAST THROUGH THE LATE AFTERNOON HOURS.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

31

In the hours before

Special weather statement, Jul 16, 5:08 PM CDT, 1 hour 13 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NASHVILLE TN
508 PM CDT FRI JUL 16 2010

TNZ024-025-057-162230-
DICKSON-HICKMAN-HUMPHREYS-
508 PM CDT FRI JUL 16 2010

...SIGNIFICANT WEATHER ADVISORY FOR DICKSON...HICKMAN AND HUMPHREYS
COUNTIES...

AT 502 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING
SEVERAL STRONG THUNDERSTORMS FROM NEAR DICKSON...AND EXTENDING 12
MILES TO THE SOUTHWEST OF DICKSON. MOVEMENT WAS NORTHEAST AT 5 MPH.

ONE OF THE STORMS WILL BE ABOUT...
  5 MILES WEST OF WHITE BLUFF BY 530 PM CDT.

PEOPLE IN DICKSON...EASTERN HUMPHREYS AND NORTHERN HICKMAN
COUNTIES...INCLUDING THE CITIES OF DICKSON AND BURNS...SHOULD MONITOR
THE WEATHER SITUATION CLOSELY. LISTEN FOR POSSIBLE WARNINGS AND BE
PREPARED TO TAKE APPROPRIATE ACTION SHOULD SEVERE WEATHER THREATEN.

HALF INCH SIZE HAIL...AND WINDS 40 TO 50 MPH ARE EXPECTED WITH THESE
STORMS. ALSO...BRIEF BUT VERY HEAVY RAINFALL MAY CAUSE CONSIDERABLE
PONDING OF WATER ON ROADS AND HIGHWAYS.

STEIGERWALDT

Local storm report, Jul 16, 5:14 PM CDT, 1 hour 7 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NASHVILLE TN
514 PM CDT FRI JUL 16 2010

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

0445 PM     TSTM WND DMG     3 NW DICKSON            36.11N 87.42W
07/16/2010                   DICKSON            TN   LAW ENFORCEMENT

            TREE BLOWN DOWN ON HIGHWAY 46 JUST NW OF DICKSON.

&&

JLM

Local storm report, Jul 16, 5:16 PM CDT, 1 hour 5 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NASHVILLE TN
516 PM CDT FRI JUL 16 2010

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

0450 PM     HAIL             1 E DICKSON             36.08N 87.36W
07/16/2010  E0.50 INCH       DICKSON            TN   LAW ENFORCEMENT

            SMALL HAIL REPORTED ON THE EAST SIDE OF THE CITY OF
            DICKSON.

&&

JLM

Special weather statement, Jul 16, 5:50 PM CDT, 31 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NASHVILLE TN
550 PM CDT FRI JUL 16 2010

TNZ027-059-162330-
DAVIDSON-WILLIAMSON-
550 PM CDT FRI JUL 16 2010

...SIGNIFICANT WEATHER ADVISORY FOR DAVIDSON AND WILLIAMSON
COUNTIES...

AT 547 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A
STRONG THUNDERSTORM NEAR FRANKLIN. THE STORM SHOWED LITTLE MOVEMENT.

PEOPLE IN NORTHERN WILLIAMSON AND SOUTHERN DAVIDSON COUNTIES...
INCLUDING THE CITY OF FRANKLIN...SHOULD MONITOR THE WEATHER SITUATION
CLOSELY. LISTEN FOR POSSIBLE WARNINGS AND BE PREPARED TO TAKE
APPROPRIATE ACTION SHOULD SEVERE WEATHER THREATEN.

PENNY SIZE HAIL...AND WINDS 40 TO 50 MPH ARE EXPECTED WITH THIS
STORM. IN ADDITION...BRIEF BUT VERY HEAVY RAINFALL WILL CAUSE
CONSIDERABLE PONDING OF WATHER ON ROADS AND HIGHWAYS.

STEIGERWALDT

Local storm report, Jul 16, 5:52 PM CDT, 29 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NASHVILLE TN
552 PM CDT FRI JUL 16 2010

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

0520 PM     TSTM WND DMG     DICKSON                 36.08N 87.38W
07/16/2010                   DICKSON            TN   LAW ENFORCEMENT

            ONE TREE REPORTED DOWN IN DICKSON...AND OTHER TREES DOWN
            OVER SOUTHWEST PART OF COUNTY.

&&

STEIGERWALDT

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 16, 3:32 PM CDT	Severe Thunderstorm Warning	OHX	Benton, Houston	43 min
Jul 16, 4:21 PM CDT	Severe Thunderstorm Warning	OHX	Dickson, Houston, Montgomery	24 min
Jul 16, 6:17 PM CDT	Severe Thunderstorm Warning	OHX	Rutherford, Wilson	28 min
Jul 16, 6:25 PM CDT	Severe Thunderstorm Warning	OHX	Montgomery	20 min
Jul 16, 6:40 PM CDT	Severe Thunderstorm Warning	OHX	Montgomery, Robertson	35 min

Nearby

Severe Thunderstorm Warnings in Tennessee, 2010 Every severe thunderstorm warning in 2010

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.