Alert archive / Tennessee / Special Weather Statements in 2018

Special Weather Statement, NWS Nashville, TN

August 9, 2018Perry County, Tennessee

NWS Nashville, TN issued this special weather statement at Aug 9, 2018, 6:51 PM CDT for Perry 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 outline as issued.

The facts

Issued
Aug 9, 2018, 6:51 PM CDT (23:51 UTC)
Expired
Aug 9, 2018, 7:15 PM CDT
In force
24 min
Issued by
NWS Nashville, TN

County Perry County, TN

The radar

The Ft Campbell radar (KHPX), 149 km from the middle of the area, began a volume at 23:53 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, 11.9 hours before the alert went out and 142 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-pSkew-T log-p diagram, Nashville Metro, TN at 12:00Z on 2018-08-09Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 407 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Nashville Metro, TN at 12:00Z on 2018-08-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 50 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
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
407 J/kg
Mixed-layer CIN
-54 J/kg
Mixed-layer LCL
876 m above ground
0-6 km bulk shear
11 kt
0-1 km storm-relative helicity
50 m²/s²
0-3 km storm-relative helicity
75 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 Aug 9, 1:37 PM CDT, 5 hours 14 minutes earlier.

Area forecast discussion, Aug 9, 1:37 PM CDT, 5 hours 14 minutes before
Area Forecast Discussion
National Weather Service Nashville TN
137 PM CDT Thu Aug 9 2018

.DISCUSSION...

A broken line of convection is currently making its way across
Middle Tennessee, somewhat similar to yesterday's activity, albeit
with less severity. Despite the presence of a weak surface ridge
bisecting the mid state this afternoon, another upper trough
approaching from the west is once again providing the lift and
focusing necessary for today's convection. Additional activity
forming over West Tennessee may cross the river later on, but the
latest HRRR suggests this progressive line of storms may be the
strongest we'll see today. Atmospheric models suggest a
persistently amplified upper pattern that will send a series of
shortwaves across Middle Tennessee through Sunday night, and then
a strong upper ridge developing over the region starting on
Monday. So look for a decrease in POP's lasting at least through
the middle of next week. However, the upper pattern will remain
amplified even during this nadir of active weather, and both the
GFS and Euro bring another shortwave into Middle Tennessee by
about Thursday, with a corresponding increase in POP's. Forecast
soundings continue to show only modest levels of instability for
the foreseeable future, and the SPC isn't hinting at anything
severe for Middle Tennessee in its latest convective outlooks. As
for temperatures, readings will remain at or slightly below normal
until the middle of next week. Even then, highs will only top out
in the low 90's. So no heat-related issues are anticipated for at
least the next 7 days.

&&

.AVIATION...
18Z TAF DISCUSSION.

Scattered showers and thunderstorms continue to move across the
area. CSV will see this main line of storms arrive between 18Z and
19Z bringing potential IFR conditions with it. Another band of
showers developing in Western TN will move into CKV between 19Z
and 20Z bringing MVFR conditions along with it. Have left in
VCTS/VCSH at all terminals through the afternoon hours. MVFR may
develop overnight at CSV and CKV around 08Z. Fog will dissipate
around 12Z.

In terms of additional showers at all terminals, short term models
are struggling with timing early tomorrow morning through mid day
tomorrow. Have left out any mention of showers due to the
uncertainty and will re-address the issue in a later TAF cycle.

&&

.PRELIMINARY POINT TEMPS/POPS...
Nashville      71  85  69  90  71 /  50  60  20  20  20
Clarksville    69  84  67  88  69 /  50  50   0  20  20
Crossville     66  78  64  82  66 /  50  70  30  20  20
Columbia       69  84  67  88  69 /  50  60  10  20  20
Lawrenceburg   68  84  65  87  67 /  50  60  20  20  20
Waverly        68  84  67  88  69 /  50  50   0  20  20

&&

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

&&

DISCUSSION......08
AVIATION........MacDonald
Hazardous weather outlook, Aug 9, 8:15 AM CDT, 10 hours 36 minutes before
Hazardous Weather Outlook
National Weather Service Nashville TN
815 AM CDT Thu Aug 9 2018

TNZ005>011-023>034-056>066-075-077>080-093>095-101315-
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-
815 AM CDT Thu Aug 9 2018

This Hazardous Weather Outlook is for portions of Middle
Tennessee.

.DAY ONE...Today and Tonight

No hazardous weather is expected at this time.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday

No hazardous weather is expected at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will not be needed.

In the hours before

Local storm report, Aug 9, 3:46 PM CDT, 3 hours 5 minutes before
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Local storm report, Aug 9, 5:29 PM CDT, 1 hour 22 minutes before
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Local storm report, Aug 9, 5:31 PM CDT, 1 hour 20 minutes before
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Local storm report, Aug 9, 5:50 PM CDT, 1 hour 1 minute before
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Local storm report, Aug 9, 6:09 PM CDT, 42 minutes before
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Special weather statement, Aug 9, 6:51 PM CDT, 0 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Aug 9, 11:25 AM CDTSpecial Weather StatementOHXWilson35 min
Aug 9, 11:50 AM CDTSpecial Weather StatementOHXCannon40 min
Aug 9, 12:36 PM CDTSpecial Weather StatementOHXDeKalb24 min
Aug 9, 1:13 PM CDTSpecial Weather StatementOHXPutnam47 min
Aug 9, 1:19 PM CDTSpecial Weather StatementOHXCoffee26 min
Aug 9, 1:57 PM CDTSpecial Weather StatementOHXCumberland48 min
Aug 9, 2:17 PM CDTSpecial Weather StatementOHXVan Buren28 min
Aug 9, 3:03 PM CDTSpecial Weather StatementOHXDickson, Houston42 min

Nearby

Special Weather Statements in Tennessee, 2018Every special weather statement in 2018

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.