Alert archive / Tennessee / Flash Flood Warnings in 2022

Flash Flood Warning 44, NWS Morristown, TN

August 11, 2022Marion County, Sequatchie County, Tennessee

NWS Morristown, TN issued this flash flood warning at Aug 11, 2022, 12:26 AM CDT for Marion County, Sequatchie County, Tennessee. It was in force for 2 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Aug 11, 2022, 12:26 AM CDT (05:26 UTC)
Expired: Aug 11, 2022, 2:47 AM CDT
In force: 2 hr
Issued by: NWS Morristown, TN
Area: Storm-based polygon
Flood severity: None

Counties Marion County, TN, Sequatchie County, TN

The radar

The Northeast Alabama radar (KHTX), 63 km from the middle of the area, began a volume at 05:27 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, 5.4 hours before the alert went out and 138 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: 267 J/kg
Mixed-layer CIN: -95 J/kg
Mixed-layer LCL: 856 m above ground
0-6 km bulk shear: 3 kt
0-1 km storm-relative helicity: -15 m²/s²
0-3 km storm-relative helicity: -11 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 flash flood 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 flash flood warning went out at Aug 10, 6:47 PM CDT, 5 hours 39 minutes earlier.

Area forecast discussion, Aug 10, 6:47 PM CDT, 5 hours 39 minutes before

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Hazardous weather outlook, Aug 10, 2:33 PM CDT, 9 hours 53 minutes before

Hazardous Weather Outlook
National Weather Service Morristown TN
333 PM EDT Wed Aug 10 2022

NCZ060-061-TNZ012>018-035>047-067>074-081>087-098>102-VAZ001-002-
005-006-008-111945-
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-
333 PM EDT Wed Aug 10 2022 /233 PM CDT Wed Aug 10 2022/

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 will continue this afternoon then will
diminish this evening. The stronger storms will have the
potential for very heavy rain, and localized flash flooding will
possible today and into this evening mainly across portions of the
northern Plateau, northeast Tennessee, and Southwest Virginia.
Also, strong gusty winds remain possible from strong storms.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday

On Thursday, additional showers and storms can be expected, and a
few locations may see very heaving rainfall with localized
flooding, as well as gusty thunderstorm winds that could knock
down a few trees.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected. However, reports of storm
damage, such as downed trees, are appreciated, as well as reports
of flooding.

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 11, 12:09 AM CDT	Areal Flood Advisory	MRX	Hamilton, Marion, Sequatchie	3 hr
Aug 11, 4:36 PM CDT	Areal Flood Advisory	MRX	Marion	114 min
Aug 11, 5:05 PM CDT	Areal Flood Advisory	MRX	Marion	115 min

Nearby

Flash Flood Warnings in Tennessee, 2022 Every flash flood warning in 2022

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.