Alert archive / Tennessee / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 140, NWS Morristown, TN

July 25, 2020Anderson County, Campbell County, Union County, Tennessee

NWS Morristown, TN issued this severe thunderstorm warning at Jul 25, 2020, 1:25 PM EDT for Anderson County, Campbell County, Union County, Tennessee. It was in force for 35 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 25, 2020, 1:25 PM EDT (17:25 UTC)
Expired: Jul 25, 2020, 2:00 PM EDT
In force: 35 min
Issued by: NWS Morristown, TN
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

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

The radar

The Knoxville radar (KMRX), 60 km from the middle of the area, began a volume at 17:27 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 12:00Z, 5.4 hours before the alert went out and 228 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: 466 J/kg
Mixed-layer CIN: -59 J/kg
Mixed-layer LCL: 1100 m above ground
0-6 km bulk shear: 11 kt
0-1 km storm-relative helicity: -50 m²/s²
0-3 km storm-relative helicity: -34 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 Jul 25, 1:25 PM EDT, 0 minutes earlier.

Area forecast discussion, Jul 25, 1:25 PM EDT, 0 minutes before

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Hazardous weather outlook, Jul 25, 3:21 AM EDT, 10 hours 4 minutes before

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In the hours before

Special weather statement, Jul 25, 11:50 AM EDT, 1 hour 35 minutes before

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Special weather statement, Jul 25, 1:19 PM EDT, 6 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
Jul 24, 8:08 PM EDT	Severe Thunderstorm Warning	MRX	McMinn, Meigs, Rhea	30 min
Jul 24, 8:42 PM EDT	Areal Flood Advisory	MRX	Bledsoe, Sequatchie	3 hr
Jul 24, 8:45 PM EDT	Areal Flood Advisory	MRX	Meigs, Rhea	2 hr
Jul 24, 9:45 PM EDT	Special Weather Statement	MRX	Sequatchie	45 min
Jul 25, 11:50 AM EDT	Special Weather Statement	MRX	Morgan	40 min
Jul 25, 12:12 PM EDT	Areal Flood Advisory	MRX	Morgan, Scott	2 hr
Jul 25, 1:19 PM EDT	Special Weather Statement	MRX	Campbell	41 min
Jul 25, 1:35 PM EDT	Special Weather Statement	MRX	Loudon	40 min
Jul 25, 1:40 PM EDT	Areal Flood Advisory	MRX	Anderson, Campbell	110 min
Jul 25, 1:45 PM EDT	Special Weather Statement	MRX	Loudon	45 min
Jul 25, 2:39 PM EDT	Areal Flood Advisory	MRX	Blount, Knox, Loudon	3 hr
Jul 25, 2:41 PM EDT	Special Weather Statement	MRX	Cocke	34 min
Jul 25, 2:43 PM EDT	Special Weather Statement	MRX	Sevier	32 min
Jul 25, 2:48 PM EDT	Special Weather Statement	MRX	Jefferson	42 min
Jul 25, 3:04 PM EDT	Areal Flood Advisory	MRX	Blount, Knox, Sevier	3 hr
Jul 25, 3:07 PM EDT	Special Weather Statement	MRX	Jefferson	38 min
Jul 25, 3:10 PM EDT	Areal Flood Advisory	MRX	McMinn, Monroe	110 min
Jul 25, 3:42 PM EDT	Flash Flood Warning	MRX	Knox, Sevier	2 hr
Jul 25, 4:22 PM EDT	Areal Flood Advisory	MRX	Jefferson	3 hr
Jul 25, 4:51 PM EDT	Special Weather Statement	MRX	Hancock	39 min
Jul 25, 4:53 PM EDT	Special Weather Statement	MRX	Greene	52 min
Jul 25, 4:55 PM EDT	Special Weather Statement	MRX	Hawkins	50 min
Jul 25, 4:57 PM EDT	Special Weather Statement	MRX	Hancock	48 min
Jul 25, 5:12 PM EDT	Special Weather Statement	MRX	Hawkins	33 min
Jul 25, 5:18 PM EDT	Severe Thunderstorm Warning	MRX	Hancock, Hawkins	31 min
Jul 25, 5:55 PM EDT	Areal Flood Advisory	MRX	Hancock, Hawkins	2 hr
Jul 25, 6:12 PM EDT	Special Weather Statement	MRX	Washington	48 min
Jul 25, 6:38 PM EDT	Flash Flood Warning	MRX	Sullivan, Washington	3 hr
Jul 25, 6:50 PM EDT	Special Weather Statement	MRX	Carter	25 min
Jul 25, 7:25 PM EDT	Areal Flood Advisory	MRX	Carter, Unicoi	2 hr
Jul 25, 7:27 PM EDT	Special Weather Statement	MRX	Carter	33 min
Jul 25, 7:34 PM EDT	Flash Flood Warning	MRX	Carter	3 hr
Jul 25, 4:03 PM EDT	Special Weather Statement	MRX	Washington	27 min
Jul 25, 4:52 PM EDT	Areal Flood Advisory	MRX	Russell, Washington, City of Bristol	3 hr
Jul 25, 6:42 PM EDT	Special Weather Statement	MRX	Scott	33 min

Nearby

Severe Thunderstorm Warnings in Tennessee, 2020 Every severe thunderstorm warning in 2020

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.