Alert archive / Tennessee / Special Weather Statements in 2016

Special Weather Statement, NWS Nashville, TN

July 19, 2016Cannon County, Tennessee

NWS Nashville, TN issued this special weather statement at Jul 19, 2016, 3:32 PM CDT for Cannon County, Tennessee. It was in force for 28 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: Jul 19, 2016, 3:32 PM CDT (20:32 UTC)
Expired: Jul 19, 2016, 4:00 PM CDT
In force: 28 min
Issued by: NWS Nashville, TN

County Cannon County, TN

The radar

The Nashville radar (KOHX), 71 km from the middle of the area, began a volume at 20:34 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, 8.5 hours before the alert went out and 64 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: 2232 J/kg
Mixed-layer CIN: -28 J/kg
Mixed-layer LCL: 985 m above ground
0-6 km bulk shear: 14 kt
0-1 km storm-relative helicity: -3 m²/s²
0-3 km storm-relative helicity: 35 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 Jul 19, 3:16 PM CDT, 16 minutes earlier.

Area forecast discussion, Jul 19, 3:16 PM CDT, 16 minutes before

Area Forecast Discussion
National Weather Service Nashville TN
316 PM CDT TUE JUL 19 2016

.DISCUSSION...

So today we have a frontal boundary interacting with impressive heat
and humidity levels. As a result scattered thunderstorms are
occurring with some strong to severe storms as well, given the high
cape values. Environment possesses little in the way of shear and
thus storm structure will be the driving force for any high wind
impacts.

Going forward, we are currently under the influence of a
strengthening ridge of high pressure. Upper divergence and even semi
appreciable mrh levels are lacking from the nocturnal convection
equation. Thus, after 02z or so, convection should dissipate.

On Wednesday, upper high will strengthen with lower mrh values and
an increase in low level subsidence. Little if any pops will be
included. The same can be said for Thursday as well as the upper
high begins to show more in the way of anti-cyclonic flow around
the high.

As for the short term temps, the heat is on. After running the
apparent T tool however, it does appear that some slightly lower
dewpoints will allow us to remain below the 105F apparent T level.
High temps the next couple of days will still reach the mid to upper
90s.

In the ext fcst, upper high will weaken some and flatten a bit into
this weekend. High temps will still reach into the mid 90s. Humidity
levels will climb and with 850 mb temps still approaching 22c,
apparent t's might surpass 105f across western areas Friday and
Saturday. Would not surprise me if heat advisories are posted as we
move toward this weekend. High temps might back off into the lower
90s by the middle of next week.

Otherwise, with the humidity inching up and a slight decrease in the
strength of the upper high, our pops will return with generally 30
pops included for aft and eve convection.

&&

.AVIATION...
18Z TAF DISCUSSION.

Scattered summertime diurnal convection expected this afternoon
before dying off this evening. low-level moisture remains high
thus fog development...some dense...very possible again overnight.
Vsbys expected to improve by 14z.

&&

.PRELIMINARY POINT TEMPS/POPS...
Nashville      76  97  75  97  75 /  10  10  10  10  10
Clarksville    74  96  73  96  74 /  10  10  10  10  10
Crossville     70  90  70  91  71 /  20  10  10  10  10
Columbia       74  97  75  97  74 /  20  10  10  10  10
Lawrenceburg   74  96  74  97  73 /  20  20  10  10  10
Waverly        74  96  73  96  74 /  20  20  10  10  10

&&

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

&&

DISCUSSION......21
AVIATION........07

Hazardous weather outlook, Jul 19, 5:12 AM CDT, 10 hours 20 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE NASHVILLE TN
512 AM CDT TUE JUL 19 2016

TNZ005>011-023>034-056>066-075-077>080-093>095-201015-
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-
512 AM CDT TUE JUL 19 2016

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF MIDDLE
TENNESSEE.

.DAY ONE...TODAY AND TONIGHT

HIGH TEMPERATURES WILL CLIMB INTO THE LOW TO MID 90S ACROSS AREAS
WEST OF THE CUMBERLAND PLATEAU. THESE TEMPERATURES COUPLED WITH
HIGH HUMIDITIES WILL LEAD TO HEAT INDICES BETWEEN 100 AND 104
DEGREES IN AREAS MAINLY WEST OF THE I-65 CORRIDOR.

PLEASE EXERCISE CAUTION IF YOU MUST BE OUTSIDE TODAY. DRINK PLENTY
OF WATER AND WEAR LIGHT WEIGHT CLOTHING TO STAY AS COOL AS
POSSIBLE.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY

HEAT INDEX VALUES WILL BE BETWEEN 100 AND 105 DEGREES FOR MOST OF
THE MID STATE WEST OF THE CUMBERLAND PLATEAU WEDNESDAY AND
THURSDAY. FRIDAY AND SATURDAY APPEAR TO BE OUR WARMEST DAYS WITH
HEAT INDICES ABOVE 105 FOR A PORTION OF OUR AREA.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL NOT BE NEEDED.

In the hours before

Special weather statement, Jul 19, 3:02 PM CDT, 30 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NASHVILLE TN
302 PM CDT TUE JUL 19 2016

TNZ060-061-192030-
MARSHALL TN-MAURY TN-
302 PM CDT TUE JUL 19 2016

...SIGNIFICANT WEATHER ADVISORY FOR WEST CENTRAL MARSHALL AND
SOUTHEASTERN MAURY COUNTIES UNTIL 330 PM CDT...

AT 302 PM CDT...DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM NEAR
COLUMBIA...MOVING SOUTHWEST AT 15 MPH.

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

LOCATIONS IMPACTED INCLUDE...
COLUMBIA...MOUNT PLEASANT AND CULLEOKA.

LAT...LON 3540 8693 3541 8692 3542 8696 3541 8697
      3542 8698 3541 8699 3542 8702 3543 8703
      3543 8706 3546 8712 3545 8715 3544 8716
      3543 8719 3561 8713 3559 8682 3539 8683
TIME...MOT...LOC 2002Z 025DEG 12KT 3558 8700

JACKSON

Special weather statement, Jul 19, 3:07 PM CDT, 25 minutes before

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Local storm report, Jul 19, 3:09 PM CDT, 23 minutes before

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Special weather statement, Jul 19, 3:09 PM CDT, 23 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NASHVILLE TN
309 PM CDT TUE JUL 19 2016

TNZ028-030-192045-
SMITH TN-WILSON TN-
309 PM CDT TUE JUL 19 2016

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHWESTERN SMITH AND
NORTHEASTERN WILSON COUNTIES UNTIL 345 PM CDT...

AT 308 PM CDT...DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM NEAR
HARTSVILLE...MOVING SOUTH AT 10 MPH.

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

LOCATIONS IMPACTED INCLUDE...
LEBANON...DICKERSON CHAPEL RECREATION AREA AND TUCKERS CROSSROADS.

LAT...LON 3632 8619 3633 8617 3629 8613 3630 8612
      3632 8611 3632 8603 3616 8602 3618 8629
      3633 8623 3633 8620
TIME...MOT...LOC 2008Z 008DEG 9KT 3631 8614

JACKSON

Special weather statement, Jul 19, 3:24 PM CDT, 8 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NASHVILLE TN
324 PM CDT TUE JUL 19 2016

TNZ006-007-023-025-026-192115-
CHEATHAM TN-ROBERTSON TN-MONTGOMERY TN-DICKSON TN-HOUSTON TN-
324 PM CDT TUE JUL 19 2016

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHWESTERN ROBERTSON...NORTHERN
DICKSON...NORTHWESTERN CHEATHAM...EASTERN HOUSTON AND SOUTHERN
MONTGOMERY COUNTIES UNTIL 415 PM CDT...

AT 323 PM CDT...DOPPLER RADAR WAS TRACKING STRONG THUNDERSTORMS ALONG
A LINE EXTENDING FROM 6 MILES WEST OF COOPERTOWN TO 11 MILES
NORTHEAST OF ERIN. MOVEMENT WAS SOUTH AT 20 MPH.

HALF INCH HAIL AND WINDS IN EXCESS OF 40 MPH WILL BE POSSIBLE WITH
THESE STORMS.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

HEAVY RAIN AND FREQUENT CLOUD TO GROUND LIGHTNING ARE OCCURRING WITH
THESE STORMS. LIGHTNING CAN STRIKE 10 MILES AWAY FROM A
THUNDERSTORM. SEEK A SAFE SHELTER INSIDE A BUILDING OR VEHICLE.

&&

LAT...LON 3620 8699 3618 8758 3619 8758 3620 8759
      3620 8760 3637 8763 3637 8759 3649 8762
      3650 8704
TIME...MOT...LOC 2023Z 353DEG 17KT 3642 8707 3641 8753

JACKSON

Special weather statement, Jul 19, 3:32 PM CDT, 0 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NASHVILLE TN
332 PM CDT TUE JUL 19 2016

TNZ063-077-192100-
CANNON TN-COFFEE TN-
332 PM CDT TUE JUL 19 2016

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHERN CANNON AND NORTHWESTERN
COFFEE COUNTIES UNTIL 400 PM CDT...

AT 331 PM CDT...DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM NEAR
WOODBURY...MOVING SOUTH AT 15 MPH.

HALF INCH HAIL AND WINDS IN EXCESS OF 40 MPH WILL BE POSSIBLE WITH
THIS STORM.

LOCATIONS IMPACTED INCLUDE...
WOODBURY AND BRADYVILLE.

LAT...LON 3565 8624 3569 8625 3571 8622 3571 8621
      3573 8621 3576 8618 3579 8619 3580 8618
      3582 8618 3582 8595 3577 8595 3573 8599
      3571 8600 3570 8599 3565 8599 3565 8598
      3563 8597
TIME...MOT...LOC 2031Z 350DEG 12KT 3578 8608

JACKSON

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 19, 2:03 PM CDT	Special Weather Statement	OHX	Clay, Jackson	42 min
Jul 19, 2:16 PM CDT	Severe Thunderstorm Warning	OHX	Jackson, Overton, Putnam	29 min
Jul 19, 2:43 PM CDT	Severe Thunderstorm Warning	OHX	Cannon, DeKalb, Wilson	20 min
Jul 19, 2:49 PM CDT	Special Weather Statement	OHX	Montgomery	41 min
Jul 19, 2:53 PM CDT	Severe Thunderstorm Warning	OHX	Montgomery	37 min
Jul 19, 3:02 PM CDT	Special Weather Statement	OHX	Maury	28 min
Jul 19, 3:07 PM CDT	Special Weather Statement	OHX	Davidson	23 min
Jul 19, 3:09 PM CDT	Special Weather Statement	OHX	Wilson	36 min
Jul 19, 3:24 PM CDT	Special Weather Statement	OHX	Cheatham	51 min
Jul 19, 4:07 PM CDT	Special Weather Statement	OHX	Sumner	23 min
Jul 19, 4:12 PM CDT	Special Weather Statement	OHX	Cheatham, Dickson	33 min
Jul 19, 4:22 PM CDT	Severe Thunderstorm Warning	OHX	Dickson, Hickman	38 min
Jul 19, 4:33 PM CDT	Special Weather Statement	OHX	Davidson	42 min
Jul 19, 4:40 PM CDT	Severe Thunderstorm Warning	OHX	Hickman	20 min
Jul 19, 6:31 PM CDT	Special Weather Statement	OHX	Wayne	29 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.