Alert archive / Tennessee / Special Weather Statements in 2017

Special Weather Statement, NWS Nashville, TN

May 27, 2017Wayne County, Tennessee

NWS Nashville, TN issued this special weather statement at May 27, 2017, 11:59 PM CDT for Wayne County, Tennessee. It was in force for 46 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: May 27, 2017, 11:59 PM CDT (04:59 UTC)
Expired: May 28, 2017, 12:45 AM CDT
In force: 46 min
Issued by: NWS Nashville, TN

County Wayne County, TN

The radar

The Columbus AFB radar (KGWX), 137 km from the middle of the area, began a volume at 05:00 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 00:00Z, 5.0 hours before the alert went out and 165 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: 2109 J/kg
Mixed-layer CIN: -21 J/kg
Mixed-layer LCL: 841 m above ground
0-6 km bulk shear: 50 kt
0-1 km storm-relative helicity: 179 m²/s²
0-3 km storm-relative helicity: 175 m²/s²
Significant tornado parameter: 2.0
Supercell composite: 12.3

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 May 27, 6:47 PM CDT, 5 hours 12 minutes earlier.

Area forecast discussion, May 27, 6:47 PM CDT, 5 hours 12 minutes before

Area Forecast Discussion
National Weather Service Nashville TN
647 PM CDT Sat May 27 2017

.UPDATE...
FOR 00Z AVIATION DISCUSSION.

&&

.DISCUSSION...

Surface high is centered just off the Florida Gulf Coast this hour
as a warm front becomes established along the Ohio Valley. This
leaves Middle Tennessee in a warm, moist & unstable environment
that is primed for thunderstorms today & tomorrow. Earlier
activity has completely dissipated, but a second round of storms
is now developing north of the TN/KY line, with weaker cells
popping up across Middle Tennessee. Skies have partially cleared
after the earlier storms, so this is allowing temperatures to warm
considerably and should help destabilization.

The morning sounding from OHX shows a strong capping inversion
situated around 750 mb, with steep mid-level lapse rates and
surface-based lifted index of -3. MUCAPE was just shy of 2,000
J/kg. GFS forecast soundings do show some erosion of the cap by
18Z tomorrow with the mid-level lapse rates contributing to higher
CAPE's and impressive LI values. Forecast SRH's indicate very
weak shear, so straight-line winds and large hail appear to be the
primary threats with the anticipated severe weather tonight and
tomorrow.

It appears as though isolated/scattered storms will persist
throughout the day and early evening until more organized
convection enters the mid state maybe 02Z or later. There is some
discrepancy between the NAM and GFS regarding timing of later
(tomorrow) storms, so on Sunday we'll just stick with likely
POP's most areas to go along with SPC's slight risk for day 2.

We likely won't see fropa here in Middle Tennessee until after
12Z Monday, so we won't see POP's drop off until then. Look for
slightly cooler temperatures (near normal or slightly above) to
start off next week and lasting at least until next weekend. A wet
pattern will slip back in rather quickly, with isolated or
scattered POP's most areas from Tuesday through the end of the
forecast period.

&&

.AVIATION...
00Z TAF DISCUSSION.

Lots of action at TAF sites this evening. Small TSRA cluster hit
CSV earlier but is moving east/away. Meanwhile, larger and
stronger cluster hit CKV within past hour (23Z) and is moving
quickly southeast toward BNA with arrival there around 0030Z.
Otherwise, expect scattered to numerous TSRA across the region
this evening with occasional low vsbys/cigs and wind gusts to
40kts or more. Very low confidence in forecast timing of
additional rounds of TSRA after 05Z but still expect some showers
and storms off and on very late tonight into Sunday morning.
Redevelopment of storms possible again Sunday afternoon.

&&

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

&&

DISCUSSION......08
AVIATION........49

Hazardous weather outlook, May 27, 3:54 PM CDT, 8 hours 5 minutes before

Hazardous Weather Outlook
National Weather Service Nashville TN
354 PM CDT Sat May 27 2017

TNZ005>011-023>034-056>066-075-077>080-093>095-281015-
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-
354 PM CDT Sat May 27 2017

This Hazardous Weather Outlook is for portions of Middle
Tennessee.

.DAY ONE...Tonight

There is a slight to moderate risk of severe storms across Middle
Tennessee tonight. Damaging winds, large hail, and localized
flooding are the main threats, but a couple of tornadoes are also
possible.

.DAYS TWO THROUGH SEVEN...Sunday through Friday

There is a slight risk of severe storms across Middle Tennessee
again Sunday and Sunday night. Damaging winds, large hail, and
localized flooding will be possible once again.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may be needed tonight and again on Sunday.

Spotter Thunderstorm Reporting Criteria
Tornado
Funnel Cloud
Flooding
Hail >= 1/2 inch
Winds > 50 MPH (Measured)
Structural Damage
Trees or Power Lines Down

Rose

In the hours before

Local storm report, May 27, 10:53 PM CDT, 1 hour 6 minutes before

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Local storm report, May 27, 10:54 PM CDT, 1 hour 5 minutes before

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Local storm report, May 27, 11:37 PM CDT, 22 minutes before

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Local storm report, May 27, 11:39 PM CDT, 20 minutes before

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Local storm report, May 27, 11:40 PM CDT, 19 minutes before

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Special weather statement, May 27, 11:59 PM 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
May 27, 7:15 PM CDT	Severe Thunderstorm Warning	OHX	Davidson, Macon, Robertson, Smith, Sumner, Trousdale and 1 more	30 min
May 27, 7:18 PM CDT	Severe Thunderstorm Warning	OHX	Cheatham, Davidson, Dickson, Rutherford, Smith, Sumner and 2 more	27 min
May 27, 7:19 PM CDT	Severe Thunderstorm Warning	OHX	Fentress, Overton, Pickett	26 min
May 27, 7:20 PM CDT	Severe Thunderstorm Warning	OHX	Cheatham, Davidson, Dickson, Hickman, Houston, Humphreys and 2 more	25 min
May 27, 7:22 PM CDT	Severe Thunderstorm Warning	OHX	Houston, Montgomery, Stewart	23 min
May 27, 7:24 PM CDT	Severe Thunderstorm Warning	OHX	Cumberland, Overton, Putnam, White	36 min
May 27, 7:41 PM CDT	Severe Thunderstorm Warning	OHX	Cheatham, Dickson, Houston, Humphreys, Montgomery, Robertson and 1 more	34 min
May 27, 7:43 PM CDT	Severe Thunderstorm Warning	OHX	Clay, DeKalb, Jackson, Macon, Putnam, Smith and 2 more	32 min
May 27, 7:47 PM CDT	Severe Thunderstorm Warning	OHX	Cannon, Davidson, DeKalb, Putnam, Rutherford, Smith and 2 more	28 min
May 27, 7:49 PM CDT	Severe Thunderstorm Warning	OHX	Cheatham, Davidson, Dickson, Hickman, Humphreys, Williamson	26 min
May 27, 7:54 PM CDT	Severe Thunderstorm Warning	OHX	Cumberland	36 min
May 27, 8:06 PM CDT	Severe Thunderstorm Warning	OHX	Clay, Cumberland, Fentress, Jackson, Overton, Pickett and 1 more	54 min
May 27, 8:09 PM CDT	Severe Thunderstorm Warning	OHX	Cannon, Cumberland, DeKalb, Putnam, Van Buren, Warren and 1 more	66 min
May 27, 8:16 PM CDT	Special Weather Statement	OHX	Hickman, Lewis, Maury, Perry, Williamson	44 min
May 27, 8:21 PM CDT	Tornado Warning	OHX	Cumberland	13 min
May 27, 8:25 PM CDT	Tornado Warning	OHX	Cumberland, Putnam	35 min
May 27, 8:26 PM CDT	Severe Thunderstorm Warning	OHX	Hickman	19 min
May 27, 8:27 PM CDT	Tornado Warning	OHX	Van Buren, White	21 min
May 27, 8:43 PM CDT	Severe Thunderstorm Warning	OHX	Giles, Hickman, Lewis, Marshall, Maury	32 min
May 27, 8:45 PM CDT	Tornado Warning	OHX	Cumberland	30 min
May 27, 8:56 PM CDT	Severe Thunderstorm Warning	OHX	Marshall, Maury	34 min
May 27, 8:57 PM CDT	Severe Thunderstorm Warning	OHX	Cumberland, Van Buren, Warren, White	18 min
May 27, 9:01 PM CDT	Special Weather Statement	OHX	Lewis, Wayne	29 min
May 27, 9:11 PM CDT	Special Weather Statement	OHX	Grundy	64 min
May 27, 9:14 PM CDT	Severe Thunderstorm Warning	OHX	Bedford, Giles, Marshall	31 min
May 27, 9:17 PM CDT	Severe Thunderstorm Warning	OHX	Bedford, Marshall, Rutherford	17 min
May 27, 9:22 PM CDT	Special Weather Statement	OHX	Giles, Lawrence, Wayne	53 min
May 27, 10:36 PM CDT	Special Weather Statement	OHX	Wayne	39 min
May 28, 12:36 AM CDT	Special Weather Statement	OHX	Lawrence	39 min

Nearby

Special Weather Statements in Tennessee, 2017 Every special weather statement in 2017

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.