Alert archive / Tennessee / Severe Thunderstorm Warnings in 2015

Severe Thunderstorm Warning 160, NWS Nashville, TN

August 22, 2015Bedford County, Marshall County, Tennessee

NWS Nashville, TN issued this severe thunderstorm warning at Aug 22, 2015, 4:24 PM CDT for Bedford County, Marshall County, 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: Aug 22, 2015, 4:24 PM CDT (21:24 UTC)
Expired: Aug 22, 2015, 5:01 PM CDT
In force: 37 min
Issued by: NWS Nashville, TN
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Bedford County, TN, Marshall County, TN

The radar

The Northeast Alabama radar (KHTX), 79 km from the middle of the area, began a volume at 21:26 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, 9.4 hours before the alert went out and 71 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1430 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: 19 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 Aug 22, 2:59 PM CDT, 1 hour 25 minutes earlier.

Area forecast discussion, Aug 22, 2:59 PM CDT, 1 hour 25 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NASHVILLE TN
259 PM CDT SAT AUG 22 2015

.DISCUSSION...

UPPER LOW SPINNING OVER ARKANSAS EVIDENT IN WATER VAPOR IS
RESPONSIBLE FOR THE SCATTERED SHOWERS AND STORMS FROM MO SEWD TO
AL. THE LINE OF SCATTERED ACTIVITY MARKS A MOISTURE BOUNDARY...BUT
THAT/S RUNNING INTO RELATIVELY DRIER AIR ACROSS MIDDLE AND ERN TN.
THINK THE CURRENT ACTIVITY WILL CONTINUE TO PUSH TOWARD NRN MIDDLE
TN AND WILL WEAKEN AFTER SUNSET RUNNING INTO THIS DRIER AIR AND AS
THE UPPER LOW PUSHES EAST OVERNIGHT. HAVE HIGHER POPS OVER THE SRN
HALF OF MIDDLE TN CLOSER TO THE HIGHER MOISTURE...WITH JUST SLIGHT
CHC POPS AFTER MIDNIGHT.

BY SUNDAY MORNING...A STRONGER UPPER LOW AND ASSOCIATED TROUGH
WILL MOVE ACROSS THE GREAT LAKES DRAGGING ITS COLD FRONT ACROSS
THE TN VALLEY LATE SUNDAY INTO EARLY MONDAY MORNING. WITH MOST OF
THE ENERGY FOCUSED WELL NORTH...JUST KEPT LOWER CHC POPS ACROSS
THE AREA WITH THE BEST CHC OCCURRING SUNDAY AFTERNOON OVER WRN
MIDDLE TN. UNIMPRESSED WITH THE DYNAMICS BUT SOME INSTABILITY IN
PLACE MAY LEAD TO A FEW STRONGER STORMS WITH GUSTY WINDS. DESPITE
MORE CLOUD COVER AND POTENTIAL FOR STORMS...SHOULD STILL REACH
HIGHS IN THE MID-UPPER 80S SUNDAY AFTERNOON.

THEREAFTER...THE COLD FRONT WILL USHER IN A COOLER AND DRIER HIGH
PRESSURE AND NW FLOW PATTERN FOR THE ENTIRE WORK WEEK. HIGHS IN
THE LOW 80S AND LOWS IN THE 50S WILL FEEL OUTSTANDING FOR LATE
AUGUST. WE SHOULD SEE WARMER TEMPS AT OR ABOVE CLIMO BY NEXT
WEEKEND WITH A SLIGHTLY MORE SOUTHERLY FLOW AS SFC HIGH PRESSURE
SLIDES EASTWARD.

&&

.PRELIMINARY POINT TEMPS/POPS...
NASHVILLE      68  88  67  83 /  30  30  30   0
CLARKSVILLE    67  86  62  80 /  30  30  30   0
CROSSVILLE     66  82  66  78 /  30  30  30  10
COLUMBIA       67  88  67  83 /  40  30  20   0
LAWRENCEBURG   68  87  68  82 /  40  40  20   0
WAVERLY        67  86  64  81 /  40  40  30   0

&&

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

&&

AL

Hazardous weather outlook, Aug 22, 3:53 PM CDT, 31 minutes before

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In the hours before

Special weather statement, Aug 22, 3:23 PM CDT, 1 hour 1 minute before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NASHVILLE TN
323 PM CDT SAT AUG 22 2015

TNZ060-061-095-222100-
MARSHALL TN-GILES TN-MAURY TN-
323 PM CDT SAT AUG 22 2015

...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN GILES...SOUTHERN
MAURY AND WEST CENTRAL MARSHALL COUNTIES UNTIL 400 PM CDT...

AT 322 PM CDT...DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM 8
MILES SOUTH OF MOUNT PLEASANT...OR 14 MILES SOUTHWEST OF COLUMBIA...
MOVING EAST AT 30 MPH.

WINDS IN EXCESS OF 30 MPH WILL BE POSSIBLE WITH THIS STORM.

LOCATIONS IMPACTED INCLUDE...
COLUMBIA...MOUNT PLEASANT...CORNERSVILLE...LYNNVILLE...I-65 EAST OF
COLUMBIA AND CULLEOKA.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TORRENTIAL RAINFALL IS ALSO OCCURRING WITH THIS STORM...AND MAY LEAD
TO FLASH FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED
ROADWAYS.

&&

LAT...LON 3539 8722 3543 8721 3544 8723 3543 8723
      3544 8729 3546 8729 3547 8728 3550 8728
      3550 8727 3551 8728 3565 8687 3537 8682
      3532 8721
TIME...MOT...LOC 2022Z 255DEG 27KT 3544 8717

21

Special weather statement, Aug 22, 3:23 PM CDT, 1 hour 1 minute before

SPECIAL WEATHER STATEMENT...UPDATED
NATIONAL WEATHER SERVICE
NASHVILLE TN 323 PM CDT SAT AUG 22 2015

TNZ060-061-095-222100-
MARSHALL TN-GILES TN-MAURY TN-
323 PM CDT SAT AUG 22 2015

...SIGNIFICANT WEATHER ADVISORY CONTINUES FOR NORTHWESTERN
GILES...SOUTHERN MAURY AND WEST CENTRAL MARSHALL COUNTIES UNTIL 400
PM CDT...

AT 322 PM CDT...DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM 8
MILES SOUTH OF MOUNT PLEASANT...OR 14 MILES SOUTHWEST OF COLUMBIA...
MOVING EAST AT 30 MPH.

ONE HALF INCH HAIL AND WINDS IN EXCESS OF 30 MPH WILL BE POSSIBLE
WITH THIS STORM.

LOCATIONS IMPACTED INCLUDE...
COLUMBIA...MOUNT PLEASANT...CORNERSVILLE...LYNNVILLE...I-65 EAST OF
COLUMBIA AND CULLEOKA.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TORRENTIAL RAINFALL IS ALSO OCCURRING WITH THIS STORM...AND MAY LEAD
TO FLASH FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED
ROADWAYS.

&&

LAT...LON 3539 8722 3543 8721 3544 8723 3543 8723
      3544 8729 3546 8729 3547 8728 3550 8728
      3550 8727 3551 8728 3565 8687 3537 8682
      3532 8721
TIME...MOT...LOC 2022Z 255DEG 27KT 3544 8717

21

Special weather statement, Aug 22, 3:57 PM CDT, 27 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 22, 2:18 PM CDT	Areal Flood Advisory	OHX	Lawrence, Lewis, Wayne	117 min
Aug 22, 3:23 PM CDT	Special Weather Statement	OHX	Maury	37 min
Aug 22, 3:32 PM CDT	Severe Thunderstorm Warning	OHX	Giles, Maury	43 min
Aug 22, 3:57 PM CDT	Special Weather Statement	OHX	Marshall	48 min
Aug 22, 6:36 PM CDT	Special Weather Statement	OHX	Grundy	24 min

Nearby

Severe Thunderstorm Warnings in Tennessee, 2015 Every severe thunderstorm warning in 2015

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.