Alert archive / Tennessee / Areal Flood Warnings in 2021

Areal Flood Warning 25, NWS Morristown, TN

August 17, 2021Monroe County, Tennessee

NWS Morristown, TN issued this areal flood warning at Aug 17, 2021, 6:00 PM EDT for Monroe County, 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: Aug 17, 2021, 6:00 PM EDT (22:00 UTC)
Expired: Aug 17, 2021, 9:00 PM EDT
In force: 3 hr
Issued by: NWS Morristown, TN
Area: Storm-based polygon
Flood severity: None

County Monroe County, TN

The radar

The Knoxville radar (KMRX), 111 km from the middle of the area, began a volume at 22:00 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, 10.0 hours before the alert went out and 232 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: 259 J/kg
Mixed-layer CIN: 0 J/kg
Mixed-layer LCL: 461 m above ground
0-6 km bulk shear: 11 kt
0-1 km storm-relative helicity: 113 m²/s²
0-3 km storm-relative helicity: 197 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 0.8

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this areal 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 areal flood warning went out at Aug 17, 3:37 PM EDT, 2 hours 23 minutes earlier.

Area forecast discussion, Aug 17, 3:37 PM EDT, 2 hours 23 minutes before

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Hazardous weather outlook, Aug 17, 3:45 PM EDT, 2 hours 15 minutes before

Hazardous Weather Outlook...UPDATED
National Weather Service Morristown TN
345 PM EDT Tue Aug 17 2021

NCZ060-061-TNZ012>018-035>047-067>074-081>087-098>102-VAZ001-002-
005-006-008-181200-
Cherokee-Clay-Scott-Campbell-Claiborne-Hancock-Hawkins-Sullivan-
Johnson-Morgan-Anderson-Union-Grainger-Hamblen-Northwest Cocke-
Cocke Smoky Mountains-Northwest Greene-Southeast Greene-
Washington-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-Russell-
345 PM EDT Tue Aug 17 2021 /245 PM CDT Tue Aug 17 2021/

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

.DAY ONE...This Afternoon and Tonight

Rainfall associated with the remnants of Tropical Storm Fred will
continue to affect the area through late tonight. Heavy tropical
downpours could produce flash flooding, and a potential for
mudslides. A Flash Flood Watch remains in effect for portions of
the area.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday

An unsettled pattern will continue Thursday through the weekend
with showers and thunderstorms each day.

.SPOTTER INFORMATION STATEMENT...

Spotter reports of flooding are encouraged.

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 16, 8:55 PM EDT	River Flood Warning	MRX	Cocke, Jefferson	45 hr
Aug 17, 11:54 AM EDT	Special Weather Statement	MRX	Polk	51 min
Aug 17, 3:06 PM EDT	Areal Flood Advisory	MRX	Blount, Sevier	5 hr
Aug 17, 4:09 PM EDT	Areal Flood Advisory	MRX	Monroe, Polk	4 hr
Aug 17, 7:02 PM EDT	Areal Flood Advisory	MRX	Blount, Knox	118 min
Aug 17, 11:43 AM EDT	Special Weather Statement	MRX	Cherokee, Clay	47 min
Aug 17, 12:45 PM EDT	Areal Flood Advisory	MRX	Cherokee, Clay	5 hr
Aug 17, 5:48 PM EDT	Areal Flood Advisory	MRX	Cherokee, Clay	2 hr

Nearby

Areal Flood Warnings in Tennessee, 2021 Every areal flood warning in 2021

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.