Alert archive / Tennessee / Special Weather Statements in 2016

Special Weather Statement, NWS Nashville, TN

August 18, 2016White County, Tennessee

NWS Nashville, TN issued this special weather statement at Aug 18, 2016, 7:28 AM CDT for White County, Tennessee. It was in force for 47 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Aug 18, 2016, 7:28 AM CDT (12:28 UTC)
Expired: Aug 18, 2016, 8:15 AM CDT
In force: 47 min
Issued by: NWS Nashville, TN

County White County, TN

The radar

The Northeast Alabama radar (KHTX), 127 km from the middle of the area, began a volume at 12:32 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, 0.5 hours before the alert went out and 132 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: 354 J/kg
Mixed-layer CIN: -13 J/kg
Mixed-layer LCL: 723 m above ground
0-6 km bulk shear: 20 kt
0-1 km storm-relative helicity: 34 m²/s²
0-3 km storm-relative helicity: 92 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.0

Open this sounding in Storm Lab

The text

As transmitted.

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What forecasters said that day

The local office's own words before this special weather statement 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 special weather statement went out at Aug 18, 6:40 AM CDT, 48 minutes earlier.

Area forecast discussion, Aug 18, 6:40 AM CDT, 48 minutes before

Area Forecast Discussion
National Weather Service Nashville TN
640 AM CDT THU AUG 18 2016

.UPDATE...
FOR 12Z AVIATION DISCUSSION.

&&

.DISCUSSION...

Showers and thunderstorms look to continue today along a
stationary boundary and assisted by upper shortwave activity.
Models are slow to advance upper level support to the southeast
today, so expect the best chances for heavier rainfall to be along
the TN River Valley to I-65. With the storm motion along the
boundary and upper support, some training of thunderstorms will be
possible, and isolated flooding may be a concern. For now, current
activity is behaving and only seeing weaker showers so far during
the overnight hours.

Upper shortwave activity looks to continue on Friday, and model
consensus is to have likely pops along and south of the I-24
corridor during the daytime hours. Slight chances for showers and
thunderstorms will continue overnight Friday into Saturday before
the next trough begins to impact the region for the weekend. The
upper trough will slowly progress eastward across the Midwest and
Great Lakes region and drag a cold front through most of the
eastern CONUS. Have likely pops Saturday for the mid state and
even into the overnight hours Sunday morning. Cold front will push
through the region during the day Sunday, so chances for precip
look to decrease as the day goes on Sunday.

Upper ridging will build in for next week and finally give the mid
state a break from precip chances. Another welcomed surprise will
be cooler high temperatures as the cold front that will move
through Sunday will bring some relief from highs in the low 90s
and lows in the 70s. Monday through Wednesday will have highs in
the mid 80s and lows in the 60s. If the forecast holds for cooler
temperatures, Monday night into Tuesday morning may have some of
the mid state see highs in the upper 50s along the TN/KY border
and on the Plateau. Nashville has a low of 61 Tuesday morning with
the current forecast, and looks to have lows in the 60s through
the work week next week.

Next chances for precip may be on Thursday night into Friday as
another Midwest trough may drag a cold front through the region.
Only have slight chance pops for now as the ECMWF and GFS dont
quite agree on placement just yet this far out. Regardless, we are
looking at much welcomed cooler temperatures and drier weather
next week.

&&

.AVIATION...
12Z TAF DISCUSSION.

A mixed bag of showers and thunderstorms throughout this TAF
period. This will make for crazy flight categories, also. This
ongoing wave of TS will drop cigs/vis to MVFR at KCSV for a
couple of hours, then VFR should return for most of the afternoon.
Some light showers may still be across the mid-state, but we
should remain VFR. Some MVFR to IFR vis could rear its head later
tonight, especially at KCKV and KCSV.

Winds will be light and mainly out of the southwest.

&&

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

&&

DISCUSSION......Barnwell
AVIATION........Unger

Hazardous weather outlook, Aug 18, 7:16 AM CDT, 12 minutes before

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In the hours before

Special weather statement, Aug 18, 4:27 AM CDT, 3 hours 1 minute before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NASHVILLE TN
427 AM CDT THU AUG 18 2016

TNZ061-075-181015-
MARSHALL TN-BEDFORD TN-
427 AM CDT THU AUG 18 2016

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHERN MARSHALL AND SOUTHERN
BEDFORD COUNTIES UNTIL 515 AM CDT...

AT 427 AM CDT...DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM NEAR
LEWISBURG...MOVING EAST AT 40 MPH.

WINDS IN EXCESS OF 40 MPH WILL BE POSSIBLE WITH THIS STORM.

LOCATIONS IMPACTED INCLUDE...
SHELBYVILLE...LEWISBURG...PETERSBURG...CORNERSVILLE...NORMANDY...
RAUS...BELFAST AND FARMINGTON.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

FREQUENT CLOUD TO GROUND LIGHTNING IS OCCURRING WITH THIS STORM.
LIGHTNING CAN STRIKE 10 MILES AWAY FROM A THUNDERSTORM. SEEK A SAFE
SHELTER INSIDE A BUILDING OR VEHICLE.

&&

LAT...LON 3535 8692 3540 8693 3552 8687 3550 8687
      3555 8684 3550 8625 3541 8625 3541 8629
      3538 8633 3536 8633 3535 8641 3532 8642
      3533 8646 3536 8649 3535 8653 3537 8658
      3536 8660 3533 8660 3530 8669
TIME...MOT...LOC 0927Z 279DEG 33KT 3543 8685

27

Special weather statement, Aug 18, 5:13 AM CDT, 2 hours 15 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NASHVILLE TN
513 AM CDT THU AUG 18 2016

TNZ075-077-181100-
BEDFORD TN-COFFEE TN-
513 AM CDT THU AUG 18 2016

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHEASTERN BEDFORD AND COFFEE
COUNTIES UNTIL 600 AM CDT...

AT 513 AM CDT...DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM OVER
SHELBYVILLE...MOVING EAST AT 35 MPH.

WINDS IN EXCESS OF 40 MPH WILL BE POSSIBLE WITH THIS STORM.

LOCATIONS IMPACTED INCLUDE...
SHELBYVILLE...MANCHESTER...TULLAHOMA...WARTRACE...NORMANDY...RAUS...
SUMMITVILLE...HILLSBORO...ARNOLD AFB AND WOODS RESERVOIR.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

FREQUENT CLOUD TO GROUND LIGHTNING IS OCCURRING WITH THIS STORM.
LIGHTNING CAN STRIKE 10 MILES AWAY FROM A THUNDERSTORM. SEEK A SAFE
SHELTER INSIDE A BUILDING OR VEHICLE.

&&

LAT...LON 3531 8600 3534 8603 3536 8615 3534 8620
      3535 8623 3534 8626 3536 8625 3537 8628
      3538 8625 3539 8628 3541 8625 3541 8628
      3535 8637 3534 8647 3556 8649 3561 8595
      3557 8595 3554 8589 3535 8588 3530 8591
TIME...MOT...LOC 1013Z 268DEG 28KT 3548 8640

27

Special weather statement, Aug 18, 6:14 AM CDT, 1 hour 14 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NASHVILLE TN
614 AM CDT THU AUG 18 2016

TNZ063-078-181200-
CANNON TN-WARREN TN-
614 AM CDT THU AUG 18 2016

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHEASTERN CANNON AND WARREN
COUNTIES UNTIL 700 AM CDT...

AT 614 AM CDT...DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM 10
MILES SOUTHEAST OF WOODBURY...MOVING EAST AT 25 MPH.

WIND GUSTS UP TO 50 MPH WILL BE POSSIBLE WITH THIS STORM.

LOCATIONS IMPACTED INCLUDE...
MCMINNVILLE...MORRISON AND CENTERTOWN.

LAT...LON 3565 8598 3565 8599 3566 8599 3565 8600
      3566 8601 3564 8604 3572 8607 3585 8579
      3584 8578 3585 8575 3581 8565 3570 8560
      3564 8560 3561 8595
TIME...MOT...LOC 1114Z 252DEG 24KT 3569 8598

27

Local storm report, Aug 18, 6:39 AM CDT, 49 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NASHVILLE TN
639 AM CDT THU AUG 18 2016

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

0606 AM     TSTM WND DMG     7 NNE NORMANDY          35.54N  86.21W
08/18/2016                   COFFEE             TN   LAW ENFORCEMENT

            A COUPLE OF TREES REPORTED DOWN ON HIGHWAY 280 AND ON
            LAKEWOOD DRIVE.

&&

EVENT NUMBER OHX1601068

FB

Special weather statement, Aug 18, 7:28 AM CDT, 0 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 18, 4:27 AM CDT	Special Weather Statement	OHX	Bedford, Marshall	48 min
Aug 18, 5:06 AM CDT	Areal Flood Advisory	OHX	Giles, Marshall, Maury	114 min
Aug 18, 5:13 AM CDT	Special Weather Statement	OHX	Bedford, Coffee	47 min
Aug 18, 5:46 AM CDT	Severe Thunderstorm Warning	OHX	Cannon, Coffee, Warren	29 min
Aug 18, 6:14 AM CDT	Special Weather Statement	OHX	Warren	46 min
Aug 18, 6:27 AM CDT	Severe Thunderstorm Warning	OHX	Warren	33 min
Aug 18, 6:56 AM CDT	Severe Thunderstorm Warning	OHX	Van Buren, Warren, White	34 min

Nearby

Special Weather Statements in Tennessee, 2016 Every special weather statement in 2016

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.