Alert archive / Tennessee / Heat Advisories in 2018

Heat Advisory 3, NWS Nashville, TN

July 5, 201817 counties in Tennessee

NWS Nashville, TN issued this heat advisory at Jul 5, 2018, 3:14 AM CDT for 17 counties in Tennessee. It took effect at Jul 5, 2018, 11:00 AM CDT. It was in force for 9 hr.

The area

The counties it named.

The facts

Issued
Jul 5, 2018, 3:14 AM CDT (08:14 UTC)
In effect from
Jul 5, 2018, 11:00 AM CDT
Expired
Jul 5, 2018, 8:00 PM CDT
In force
9 hr
Issued by
NWS Nashville, TN

Counties Cheatham County, TN, Davidson County, TN, Dickson County, TN, Hickman County, TN, Houston County, TN, Humphreys County, TN, Macon County, TN, Montgomery County, TN, Perry County, TN, Robertson County, TN, Rutherford County, TN, Smith County, TN, Stewart County, TN, Sumner County, TN, Trousdale County, TN, Williamson County, TN, Wilson County, TN

The radar

The Nashville radar (KOHX), 36 km from the middle of the area, began a volume at 08:16 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

Little Rock, AR (KBYH), launched 00:00Z, 8.2 hours before the alert went out and 311 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, Little Rock, AR at 00:00Z on 2018-07-05Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 677 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, Little Rock, AR at 00:00Z on 2018-07-05The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -6 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
677 J/kg
Mixed-layer CIN
-18 J/kg
Mixed-layer LCL
1541 m above ground
0-6 km bulk shear
12 kt
0-1 km storm-relative helicity
-6 m²/s²
0-3 km storm-relative helicity
18 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this heat advisory 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 heat advisory went out at Jul 4, 11:20 PM CDT, 3 hours 54 minutes earlier.

Area forecast discussion, Jul 4, 11:20 PM CDT, 3 hours 54 minutes before
Area Forecast Discussion
National Weather Service Nashville TN
1120 PM CDT Wed Jul 4 2018

.UPDATE...
FOR 06Z AVIATION DISCUSSION.

&&

.DISCUSSION...

Ongoing showers and thunderstorms are mainly impacting the
southwest part of the CWA tonight associated with minor upper
level disturbances moving westward around the upper high. Chances
for additional showers and storms will continue for an hour or two
this evening before dissipating or moving out of the mid state.

Latest 00Z model guidance is just starting to trickle in, and a
few suggest additional showers and thunderstorms during the
overnight hours associated with additional upper shortwaves. For
now left the forecast dry overnight but may need to add pops
overnight should more guidance get on board with overnight
convection. Rest of the forecast is on track.

&&

.AVIATION...
06Z TAF DISCUSSION.

VFR. Scattered cumulus are expected overnight and again on
Thursday as the upper level ridge to our north shifts westward
into the Plains states. No precipitation is expected overnight
into Thursday morning, but a few showers or storms are possible
near airports Thursday afternoon/evening, especially at CSV. Not
enough confidence to include VCTS mention attm. Light northeast
to east winds are anticipated through the TAF period.

&&

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

&&

DISCUSSION......Barnwell
AVIATION........Shamburger
Hazardous weather outlook, Jul 4, 9:19 PM CDT, 5 hours 55 minutes before
Hazardous Weather Outlook
National Weather Service Nashville TN
919 PM CDT Wed Jul 4 2018

TNZ005>011-023>034-056>066-075-077>080-093>095-060230-
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-
919 PM CDT Wed Jul 4 2018

This Hazardous Weather Outlook is for portions of Middle
Tennessee.

.DAY ONE...Tonight

No hazardous weather is expected at this time.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday

Heat index values may reach 100 to 105 in some locations again on
Thursday.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will not be needed.

In the hours before

Special weather statement, Jul 5, 1:39 AM CDT, 1 hour 35 minutes before
Special Weather Statement
National Weather Service Nashville TN
139 AM CDT THU JUL 5 2018

TNZ026-027-050715-
Davidson TN-Cheatham TN-
139 AM CDT THU JUL 5 2018

...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN DAVIDSON AND
NORTHEASTERN CHEATHAM COUNTIES UNTIL 215 AM CDT...

At 138 AM CDT, Doppler radar was tracking a strong thunderstorm near
Ashland City, moving northwest at 20 mph.

Winds in excess of 40 mph will be possible with this storm.

Locations impacted include...
Ashland City, Pleasant View, Beaman Park and Bells Bend.

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 3629 8683 3613 8692 3618 8715 3639 8706
TIME...MOT...LOC 0638Z 113DEG 16KT 3624 8697

13
Special weather statement, Jul 5, 2:12 AM CDT, 1 hour 2 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Jul 4, 7:33 PM CDTSpecial Weather StatementOHXLawrence42 min
Jul 4, 8:03 PM CDTSpecial Weather StatementOHXWayne42 min
Jul 4, 8:43 PM CDTSpecial Weather StatementOHXWayne32 min
Jul 5, 1:39 AM CDTSpecial Weather StatementOHXCheatham36 min
Jul 5, 2:12 AM CDTSpecial Weather StatementOHXMontgomery33 min
Jul 5, 3:44 PM CDTSpecial Weather StatementOHXGiles31 min
Jul 5, 3:55 PM CDTSevere Thunderstorm WarningOHXGiles, Lawrence35 min
Jul 5, 4:07 PM CDTSpecial Weather StatementOHXMontgomery53 min
Jul 5, 4:27 PM CDTSevere Thunderstorm WarningOHXLawrence, Wayne48 min
Jul 5, 4:59 PM CDTSpecial Weather StatementOHXMontgomery31 min
Jul 5, 5:04 PM CDTSpecial Weather StatementOHXCoffee, Grundy41 min
Jul 5, 5:09 PM CDTSpecial Weather StatementOHXWayne51 min
Jul 5, 5:22 PM CDTSpecial Weather StatementOHXHouston, Stewart38 min
Jul 5, 5:41 PM CDTSevere Thunderstorm WarningOHXHouston, Humphreys, Stewart24 min
Jul 5, 5:51 PM CDTSpecial Weather StatementOHXVan Buren39 min
Jul 5, 5:58 PM CDTSevere Thunderstorm WarningOHXGrundy, Warren32 min
Jul 5, 6:13 PM CDTAreal Flood AdvisoryOHXGrundy, Van Buren, Warren2 hr
Jul 5, 6:21 PM CDTSpecial Weather StatementOHXMaury24 min
Jul 5, 6:33 PM CDTSpecial Weather StatementOHXStewart27 min
Jul 5, 6:35 PM CDTSpecial Weather StatementOHXVan Buren, Warren40 min
Jul 5, 6:45 PM CDTSpecial Weather StatementOHXMaury45 min
Jul 5, 6:56 PM CDTSpecial Weather StatementOHXStewart34 min

Nearby

Heat Advisories in Tennessee, 2018Every heat advisory 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.