Alert archive / Tennessee / Special Weather Statements in 2021

Special Weather Statement, NWS Morristown, TN

July 11, 2021Hamilton County, Tennessee

NWS Morristown, TN issued this special weather statement at Jul 11, 2021, 12:26 PM EDT for Hamilton County, Tennessee. It was in force for 49 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Jul 11, 2021, 12:26 PM EDT (16:26 UTC)
Expired: Jul 11, 2021, 1:15 PM EDT
In force: 49 min
Issued by: NWS Morristown, TN

County Hamilton County, TN

The radar

The Northeast Alabama radar (KHTX), 56 km from the middle of the area, began a volume at 16:30 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, 4.4 hours before the alert went out and 152 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: 343 J/kg
Mixed-layer CIN: -53 J/kg
Mixed-layer LCL: 642 m above ground
0-6 km bulk shear: 23 kt
0-1 km storm-relative helicity: 158 m²/s²
0-3 km storm-relative helicity: 176 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 1.0

Open this sounding in Storm Lab

The text

As transmitted.

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What forecasters said that day

The local office's own words before this special weather statement 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 special weather statement went out at Jul 11, 10:22 AM EDT, 2 hours 4 minutes earlier.

Area forecast discussion, Jul 11, 10:22 AM EDT, 2 hours 4 minutes before

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Hazardous weather outlook, Jul 11, 3:14 AM EDT, 9 hours 12 minutes before

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In the hours before

Special weather statement, Jul 11, 11:50 AM EDT, 36 minutes before

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Special weather statement, Jul 11, 12:26 PM EDT, 0 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 10, 9:44 PM EDT	Special Weather Statement	MRX	Knox	46 min
Jul 11, 11:50 AM EDT	Special Weather Statement	MRX	Marion	40 min
Jul 11, 6:06 PM EDT	Special Weather Statement	MRX	Marion	39 min
Jul 11, 6:52 PM EDT	Special Weather Statement	MRX	Bledsoe, Meigs, Rhea, Sequatchie	38 min
Jul 11, 7:03 PM EDT	Areal Flood Advisory	MRX	Marion	3 hr
Jul 11, 7:19 PM EDT	Areal Flood Advisory	MRX	Bledsoe, Sequatchie	3 hr
Jul 11, 7:59 PM EDT	Special Weather Statement	MRX	Meigs	46 min

Nearby

Special Weather Statements in Tennessee, 2021 Every special weather statement 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.