Alert archive / Tennessee / Flash Flood Warnings in 2023

Flash Flood Warning 1, NWS Morristown, TN

February 16, 20234 counties in Tennessee

NWS Morristown, TN issued this flash flood warning at Feb 16, 2023, 5:26 AM EST for 4 counties in Tennessee. It was in force for 3 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: Feb 16, 2023, 5:26 AM EST (10:26 UTC)
Expired: Feb 16, 2023, 8:30 AM EST
In force: 3 hr
Issued by: NWS Morristown, TN
Area: Storm-based polygon
Flood severity: None

Counties Anderson County, TN, Campbell County, TN, Claiborne County, TN, Union County, TN

The radar

The Knoxville radar (KMRX), 53 km from the middle of the area, began a volume at 10:28 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, 10.4 hours before the alert went out and 238 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: 107 J/kg
Mixed-layer CIN: -50 J/kg
Mixed-layer LCL: 952 m above ground
0-6 km bulk shear: 60 kt
0-1 km storm-relative helicity: 140 m²/s²
0-3 km storm-relative helicity: 166 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.5

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 Feb 16, 3:36 AM EST, 1 hour 50 minutes earlier.

Area forecast discussion, Feb 16, 3:36 AM EST, 1 hour 50 minutes before

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Hazardous weather outlook, Feb 16, 3:17 AM EST, 2 hours 9 minutes before

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In the hours before

Special weather statement, Feb 16, 4:04 AM EST, 1 hour 22 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Feb 16, 4:04 AM EST	Special Weather Statement	MRX	Campbell	41 min
Feb 16, 5:12 AM EST	Areal Flood Advisory	MRX	Anderson, Campbell, Claiborne, Scott, Union	3 hr
Feb 16, 10:01 AM EST	River Flood Warning	MRX	Bledsoe, Marion, Sequatchie	70 hr

Nearby

Flash Flood Warnings in Tennessee, 2023 Every flash flood 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.