Alert archive / Tennessee / Special Weather Statements in 2017

Special Weather Statement, NWS Morristown, TN

August 4, 2017Knox County, Tennessee

NWS Morristown, TN issued this special weather statement at Aug 4, 2017, 5:29 PM EDT for Knox County, Tennessee. It was in force for 46 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: Aug 4, 2017, 5:29 PM EDT (21:29 UTC)
Expired: Aug 4, 2017, 6:15 PM EDT
In force: 46 min
Issued by: NWS Morristown, TN

County Knox County, TN

The nearest sounding before it

Nashville Metro, TN (KBNA), launched 12:00Z, 9.5 hours before the alert went out and 253 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: 955 J/kg
Mixed-layer CIN: -43 J/kg
Mixed-layer LCL: 947 m above ground
0-6 km bulk shear: 34 kt
0-1 km storm-relative helicity: 100 m²/s²
0-3 km storm-relative helicity: 92 m²/s²
Significant tornado parameter: 0.4
Supercell composite: 2.2

Open this sounding in Storm Lab

The text

As transmitted.

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The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 4, 6:32 PM EDT	Special Weather Statement	MRX	Anderson	43 min
Aug 4, 7:08 PM EDT	Special Weather Statement	MRX	Knox, Loudon, Roane	52 min
Aug 4, 7:50 PM EDT	Special Weather Statement	MRX	Loudon, Roane	40 min

Nearby

Special Weather Statements in Tennessee, 2017 Every special weather statement in 2017

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.