Alert archive / Tennessee / Severe Thunderstorm Warnings in 2023

Severe Thunderstorm Warning 267, NWS Morristown, TN

September 9, 2023Cocke County, Greene County, Tennessee

NWS Morristown, TN issued this severe thunderstorm warning at Sep 9, 2023, 1:58 PM EDT for Cocke County, Greene County, Tennessee. It was in force for 47 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
Sep 9, 2023, 1:58 PM EDT (17:58 UTC)
Expired
Sep 9, 2023, 2:45 PM EDT
In force
47 min
Issued by
NWS Morristown, TN
Area
Storm-based polygon
Hail
1.0 in
Wind
60.0 mph

Counties Cocke County, TN, Greene County, TN

The radar

The Knoxville radar (KMRX), 40 km from the middle of the area, began a volume at 18:00 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

Peachtre/Fal Fld, GA (KFFC), launched 12:00Z, 6.0 hours before the alert went out and 329 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, Peachtre/Fal Fld, GA at 12:00Z on 2023-09-09Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 498 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, Peachtre/Fal Fld, GA at 12:00Z on 2023-09-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 13 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
498 J/kg
Mixed-layer CIN
-76 J/kg
Mixed-layer LCL
1029 m above ground
0-6 km bulk shear
16 kt
0-1 km storm-relative helicity
13 m²/s²
0-3 km storm-relative helicity
85 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 severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Morristown, TN wrote its last area forecast discussion before this severe thunderstorm warning went out at Sep 9, 1:16 PM EDT, 42 minutes earlier.

Area forecast discussion, Sep 9, 1:16 PM EDT, 42 minutes before
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Hazardous weather outlook, Sep 9, 11:42 AM EDT, 2 hours 16 minutes before
Hazardous Weather Outlook...UPDATED
National Weather Service Morristown TN
1142 AM EDT Sat Sep 9 2023

NCZ060-061-TNZ012>018-035>047-067>074-081>087-098>102-VAZ001-002-
005-006-008-101545-
Cherokee-Clay-Scott TN-Campbell-Claiborne-Hancock-Hawkins-
Sullivan-Johnson-Morgan-Anderson-Union-Grainger-Hamblen-
Northwest Cocke-Cocke Smoky Mountains-Northwest Greene-
Southeast Greene-Washington TN-Unicoi-Northwest Carter-
Southeast Carter-Roane-Loudon-Knox-Jefferson-Northwest Blount-
Blount Smoky Mountains-North Sevier-Sevier Smoky Mountains-
Sequatchie-Bledsoe-Rhea-Meigs-McMinn-Northwest Monroe-
Southeast Monroe-Marion-Hamilton-Bradley-West Polk-East Polk-Lee-
Wise-Scott VA-Russell-Washington VA-
1142 AM EDT Sat Sep 9 2023 /1042 AM CDT Sat Sep 9 2023/

This Hazardous Weather Outlook is for portions of southwest North
Carolina...east Tennessee and southwest Virginia.

.DAY ONE...This Afternoon and Tonight

Showers and thunderstorms are likely in southwest North Carolina,
southwest Virginia, and eastern portions of East Tennessee and in
this afternoon. The main threats with these storms will be
frequent lightning and heavy rainfall. Slow-moving storms with
heavy rain may result in localized flooding.

.DAYS TWO THROUGH SEVEN...Sunday through Friday

The probability for widespread hazardous weather is low.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not needed at this time.

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 8, 8:54 PM EDTAreal Flood AdvisoryMRXCocke, Greene, Hamblen, Jefferson3 hr
Sep 8, 10:03 PM EDTAreal Flood AdvisoryMRXGreene3 hr
Sep 9, 2:46 PM EDTSpecial Weather StatementMRXMonroe29 min
Sep 9, 2:49 PM EDTSpecial Weather StatementMRXBledsoe26 min
Sep 9, 2:54 PM EDTSpecial Weather StatementMRXCocke36 min
Sep 9, 2:59 PM EDTSpecial Weather StatementMRXSevier31 min
Sep 9, 3:18 PM EDTSpecial Weather StatementMRXMonroe27 min
Sep 9, 3:31 PM EDTSpecial Weather StatementMRXHamilton29 min
Sep 9, 3:33 PM EDTSpecial Weather StatementMRXSevier42 min
Sep 9, 3:33 PM EDTSevere Thunderstorm WarningMRXMonroe30 min
Sep 9, 3:36 PM EDTAreal Flood AdvisoryMRXSevier2 hr
Sep 9, 3:38 PM EDTAreal Flood AdvisoryMRXMonroe2 hr
Sep 9, 4:01 PM EDTSpecial Weather StatementMRXMarion44 min
Sep 9, 4:10 PM EDTSpecial Weather StatementMRXBlount35 min
Sep 9, 4:24 PM EDTFlash Flood WarningMRXMonroe80 min
Sep 9, 4:43 PM EDTSpecial Weather StatementMRXLoudon47 min
Sep 9, 4:47 PM EDTAreal Flood AdvisoryMRXGreene, Hawkins4 hr
Sep 9, 4:51 PM EDTSpecial Weather StatementMRXHamilton39 min
Sep 9, 5:05 PM EDTAreal Flood AdvisoryMRXBlount, Loudon, Monroe3 hr
Sep 9, 5:32 PM EDTAreal Flood AdvisoryMRXGreene, Sullivan, Unicoi, Washington3 hr
Sep 9, 6:00 PM EDTSpecial Weather StatementMRXRhea45 min
Sep 9, 6:11 PM EDTAreal Flood AdvisoryMRXSullivan3 hr
Sep 9, 6:30 PM EDTSpecial Weather StatementMRXAnderson45 min
Sep 9, 6:44 PM EDTSpecial Weather StatementMRXHamblen46 min
Sep 9, 6:53 PM EDTSevere Thunderstorm WarningMRXAnderson, Campbell52 min
Sep 9, 7:11 PM EDTSevere Thunderstorm WarningMRXCampbell, Union49 min
Sep 9, 7:27 PM EDTAreal Flood AdvisoryMRXAnderson, Campbell, Union3 hr
Sep 9, 7:44 PM EDTSpecial Weather StatementMRXScott46 min
Sep 9, 7:54 PM EDTSpecial Weather StatementMRXClaiborne51 min
Sep 9, 7:55 PM EDTSevere Thunderstorm WarningMRXClaiborne37 min
Sep 9, 2:06 PM EDTSpecial Weather StatementMRXScott39 min
Sep 9, 5:42 PM EDTSpecial Weather StatementMRXWashington48 min
Sep 9, 5:51 PM EDTSpecial Weather StatementMRXWise39 min
Sep 9, 5:58 PM EDTSpecial Weather StatementMRXRussell47 min
Sep 9, 6:03 PM EDTSpecial Weather StatementMRXLee42 min
Sep 9, 6:13 PM EDTAreal Flood AdvisoryMRXRussell, Washington4 hr
Sep 9, 6:19 PM EDTSevere Thunderstorm WarningMRXLee41 min
Sep 9, 7:01 PM EDTSpecial Weather StatementMRXLee44 min
Sep 9, 7:06 PM EDTAreal Flood AdvisoryMRXRussell, Washington3 hr
Sep 9, 7:20 PM EDTAreal Flood AdvisoryMRXLee3 hr
Sep 9, 2:12 PM EDTSpecial Weather StatementMRXCherokee48 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.