Alert archive / Tennessee / Heat Advisories in 2018

Heat Advisory 2, NWS Nashville, TN

July 4, 201817 counties in Tennessee

NWS Nashville, TN issued this heat advisory at Jul 4, 2018, 3:19 AM CDT for 17 counties in Tennessee. It took effect at Jul 4, 2018, 11:00 AM CDT. It was in force for 9 hr.

The area

The counties it named.

The facts

Issued: Jul 4, 2018, 3:19 AM CDT (08:19 UTC)
In effect from: Jul 4, 2018, 11:00 AM CDT
Expired: Jul 4, 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 08:18 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

Birmingham, AL (KBMX), launched 00:00Z, 8.3 hours before the alert went out and 336 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: 1606 J/kg
Mixed-layer CIN: -26 J/kg
Mixed-layer LCL: 1395 m above ground
0-6 km bulk shear: 17 kt
0-1 km storm-relative helicity: -13 m²/s²
0-3 km storm-relative helicity: -21 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 3, 11:23 PM CDT, 3 hours 56 minutes earlier.

Area forecast discussion, Jul 3, 11:23 PM CDT, 3 hours 56 minutes before

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Nearby

Heat Advisories in Tennessee, 2018 Every 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.