Alert archive / Tennessee / Special Weather Statements in 2016

Special Weather Statement, NWS Nashville, TN

September 10, 2016Montgomery County, Stewart County, Tennessee

NWS Nashville, TN issued this special weather statement at Sep 10, 2016, 2:39 PM CDT for Montgomery County, Stewart County, Tennessee. It was in force for 51 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: Sep 10, 2016, 2:39 PM CDT (19:39 UTC)
Expired: Sep 10, 2016, 3:30 PM CDT
In force: 51 min
Issued by: NWS Nashville, TN

Counties Montgomery County, TN, Stewart County, TN

The radar

The Ft Campbell radar (KHPX), 34 km from the middle of the area, began a volume at 19:44 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, 7.7 hours before the alert went out and 77 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: 5 J/kg
Mixed-layer CIN: -164 J/kg
Mixed-layer LCL: 1447 m above ground
0-6 km bulk shear: 23 kt
0-1 km storm-relative helicity: -17 m²/s²
0-3 km storm-relative helicity: 39 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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 Sep 10, 2:26 PM CDT, 13 minutes earlier.

Area forecast discussion, Sep 10, 2:26 PM CDT, 13 minutes before

Area Forecast Discussion
National Weather Service Nashville TN
226 PM CDT SAT SEP 10 2016

.DISCUSSION...

Current radar imagery showing a narrow band of showers and tstms
just now moving into our northwestern cwa. This convergence zone
should remain rather progressive with the activity approaching our
Plateau around 7 pm this evening. The activity should then exit
the plateau by midnight.

Latest sfc analysis indicates that this activity is just along and
ahead of the main cold frontal boundary. Thus, wind energy just
ahead of the boundary is elevated and the linear omega fields are
tapping into some elevated cape values as well.

For the fcst, will go ahead and include pre evening wording. Strong
storms are possible as well, with perhaps warning levels becoming
possible for a storm or two. Otw, look for clearing over western
areas late.

Moving forward, the next few days are looking dry with lower
humidity values. Still warm though as the shortwave pulls east and
heights quickly rebound.

In the ext fcst, weak w-e ridging will prevail. A weakening boundary
will attempt to approach around mid week but pops at best will be 20
percent. Late in the extended, we will see a pattern change as
stronger upper troughing and a frontal boundary moves our way. Will
include higher pops for next weekend.

For the ext temps, above normal values to continue although high
temps late in the extended will lower toward more seasonal levels.

&&

.AVIATION...
18Z TAF DISCUSSION.

VFR conditions for a few more hours this afternoon. Flight
categories will decrease for a couple of hours at each terminal as
a line of showers and thunderstorms pushes through the mid-state.
Cigs should remain around 4k feet, but vis will drop with the
heavier rains, then improve quickly behind the line. The only
other reduction in flight categories should be IFR at CSV late
tonight behind the front.

The other story will be the winds. Breezy southwest to west winds
will be out ahead of the front with gusts to 20 kts. Winds should
relax fairly quickly behind the FROPA and turn northerly.

&&

.PRELIMINARY POINT TEMPS/POPS...
Nashville      62  84  56  88  64 /  40   0   0   0   0
Clarksville    58  81  54  87  61 /  10   0   0   0   0
Crossville     63  79  55  82  63 /  50   0   0  10  10
Columbia       62  85  55  88  65 /  40   0   0   0   0
Lawrenceburg   63  85  55  89  65 /  50   0   0   0   0
Waverly        59  81  55  86  63 /  20   0   0   0   0

&&

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

&&

DISCUSSION......21
AVIATION........Unger

Hazardous weather outlook, Sep 10, 5:30 AM CDT, 9 hours 9 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE NASHVILLE TN
530 AM CDT SAT SEP 10 2016

TNZ005>011-023>034-056>066-075-077>080-093>095-111030-
STEWART-MONTGOMERY-ROBERTSON-SUMNER-MACON-CLAY-PICKETT-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-
530 AM CDT SAT SEP 10 2016

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF MIDDLE
TENNESSEE.

.DAY ONE...TODAY AND TONIGHT

A FEW STRONG THUNDERSTORMS...WITH GUSTY WINDS AND HEAVY
DOWNPOURS...CAN BE EXPECTED THIS AFTERNOON AND EVENING. SMALL
BRANCHES COULD FALL VICTIM TO THE WIND...AND HEAVY DOWNPOURS MAY
PRODUCE LOCALIZED PONDING.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

SPOTTERS AND EMERGENCY MANAGERS ARE ENCOURAGED TO REPORT ANY STORM
DAMAGE OR FLOOD REPORTS TO THE NATIONAL WEATHER SERVICE.

19

In the hours before

Special weather statement, Sep 10, 2:39 PM CDT, 0 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NASHVILLE TN
239 PM CDT SAT SEP 10 2016

TNZ005-006-102030-
MONTGOMERY TN-STEWART TN-
239 PM CDT SAT SEP 10 2016

...SIGNIFICANT WEATHER ADVISORY FOR EASTERN STEWART AND MONTGOMERY
COUNTIES UNTIL 330 PM CDT...

AT 239 PM CDT...DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM NEAR
BIG ROCK...OR 8 MILES EAST OF DOVER...MOVING EAST AT 45 MPH.

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

LOCATIONS IMPACTED INCLUDE...
CLARKSVILLE...DOVER...BIG ROCK...CUMBERLAND CITY...PALMYRA...
WOODLAWN...CUNNINGHAM AND INDIAN MOUND.

RIVERFEST IN CLARKSVILLE WILL ALSO BE IMPACTED.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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 3664 8711 3656 8714 3655 8713 3655 8712
      3646 8712 3644 8715 3642 8715 3643 8717
      3641 8718 3641 8721 3635 8728 3632 8729
      3634 8757 3634 8759 3636 8759 3637 8761
      3637 8772 3633 8779 3633 8787 3664 8778
TIME...MOT...LOC 1939Z 247DEG 40KT 3651 8770

27

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 10, 2:53 PM CDT	Severe Thunderstorm Warning	OHX	Montgomery, Stewart	52 min
Sep 10, 3:26 PM CDT	Special Weather Statement	OHX	Robertson	34 min
Sep 10, 3:29 PM CDT	Special Weather Statement	OHX	Dickson	46 min
Sep 10, 3:34 PM CDT	Special Weather Statement	OHX	Hickman	41 min
Sep 10, 4:00 PM CDT	Special Weather Statement	OHX	Cheatham	30 min
Sep 10, 4:03 PM CDT	Special Weather Statement	OHX	Sumner	27 min
Sep 10, 4:21 PM CDT	Special Weather Statement	OHX	Davidson, Williamson	39 min
Sep 10, 4:28 PM CDT	Severe Thunderstorm Warning	OHX	Cheatham, Davidson, Sumner, Williamson	32 min
Sep 10, 4:50 PM CDT	Severe Thunderstorm Warning	OHX	Davidson, Rutherford, Williamson, Wilson	40 min
Sep 10, 5:01 PM CDT	Special Weather Statement	OHX	Marshall, Maury	29 min
Sep 10, 5:03 PM CDT	Special Weather Statement	OHX	Clay, Jackson, Macon, Smith, Trousdale	27 min
Sep 10, 5:18 PM CDT	Severe Thunderstorm Warning	OHX	Cannon, DeKalb, Putnam, Rutherford, Smith, Wilson	42 min
Sep 10, 5:33 PM CDT	Special Weather Statement	OHX	Bedford, Marshall	42 min
Sep 10, 5:46 PM CDT	Special Weather Statement	OHX	Clay, Jackson, Overton, Pickett, Putnam	29 min
Sep 10, 5:54 PM CDT	Special Weather Statement	OHX	Cannon, Cumberland, DeKalb, Van Buren, Warren, White	66 min
Sep 10, 5:57 PM CDT	Special Weather Statement	OHX	Coffee, Grundy	63 min
Sep 10, 6:24 PM CDT	Special Weather Statement	OHX	Fentress, Overton, Pickett	66 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.