Alert archive / Tennessee / Severe Thunderstorm Warnings in 2023

Severe Thunderstorm Warning 152, NWS Morristown, TN

July 18, 2023Greene County, Hawkins County, Tennessee

NWS Morristown, TN issued this severe thunderstorm warning at Jul 18, 2023, 6:56 AM EDT for Greene County, Hawkins County, Tennessee. It was in force for 22 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Jul 18, 2023, 6:56 AM EDT (10:56 UTC)
Expired
Jul 18, 2023, 7:18 AM EDT
In force
22 min
Issued by
NWS Morristown, TN
Area
Storm-based polygon
Hail
1.0 in
Wind
60.0 mph

Counties Greene County, TN, Hawkins County, TN

The radar

The Knoxville radar (KMRX), 48 km from the middle of the area, began a volume at 10:55 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, 10.9 hours before the alert went out and 333 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 00:00Z on 2023-07-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1308 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 00:00Z on 2023-07-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 31 square meters per square second.193958Sfc1 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
1308 J/kg
Mixed-layer CIN
-18 J/kg
Mixed-layer LCL
1604 m above ground
0-6 km bulk shear
30 kt
0-1 km storm-relative helicity
31 m²/s²
0-3 km storm-relative helicity
88 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.9

Open this sounding in Storm Lab

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 18, 6:41 AM EDTSpecial Weather StatementMRXCampbell34 min
Jul 18, 6:44 AM EDTSpecial Weather StatementMRXHawkins31 min
Jul 18, 7:09 AM EDTSpecial Weather StatementMRXJefferson36 min
Jul 18, 8:04 AM EDTSpecial Weather StatementMRXCocke, Jefferson, Sevier41 min
Jul 18, 6:51 PM EDTSevere Thunderstorm WarningMRXHamilton, Marion, Sequatchie54 min
Jul 18, 6:55 PM EDTSpecial Weather StatementMRXBledsoe, Rhea65 min
Jul 18, 7:40 PM EDTSpecial Weather StatementMRXBradley, Hamilton65 min
Jul 18, 7:43 PM EDTSpecial Weather StatementMRXMcMinn, Meigs, Rhea62 min

Nearby

Severe Thunderstorm Warnings in Tennessee, 2023Every severe thunderstorm warning in 2023

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.