Alert archive / Tennessee / Frost Advisories in 2016

Frost Advisory 6, NWS Morristown, TN

November 12, 201619 counties in Tennessee; Cherokee County, Clay County, North Carolina

NWS Morristown, TN issued this frost advisory at Nov 12, 2016, 2:52 PM EST for 19 counties in Tennessee; Cherokee County, Clay County, North Carolina. It took effect at Nov 13, 2016, 12:00 AM EST. It was in force for 9 hr.

The area

The counties it named.

The facts

Issued: Nov 12, 2016, 2:52 PM EST (19:52 UTC)
In effect from: Nov 13, 2016, 12:00 AM EST
Expired: Nov 13, 2016, 9:00 AM EST
In force: 9 hr
Issued by: NWS Morristown, TN

All 21 counties

Cherokee County, NC, Clay County, NC, Anderson County, TN, Bledsoe County, TN, Blount County, TN, Bradley County, TN, Hamilton County, TN, Jefferson County, TN, Knox County, TN, Loudon County, TN, Marion County, TN, McMinn County, TN, Meigs County, TN, Monroe County, TN, Morgan County, TN, Polk County, TN, Rhea County, TN, Roane County, TN, Sequatchie County, TN, Sevier County, TN, Union County, TN

The radar

The Knoxville radar (KMRX), 115 km from the middle of the area, began a volume at 19:56 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, 7.9 hours before the alert went out and 202 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1273 m above ground
0-6 km bulk shear: 47 kt
0-1 km storm-relative helicity: -87 m²/s²
0-3 km storm-relative helicity: -57 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 frost advisory 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 frost advisory went out at Nov 12, 11:58 AM EST, 2 hours 54 minutes earlier.

Area forecast discussion, Nov 12, 11:58 AM EST, 2 hours 54 minutes before

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Hazardous weather outlook, Nov 12, 3:13 AM EST, 11 hours 39 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
Nov 12, 3:04 AM EST	Freeze Warning	MRX	Campbell, Carter, Claiborne, Cocke, Grainger, Greene and 9 more	30 hr

Nearby

Frost Advisories in Tennessee, 2016 Frost Advisories in North Carolina, 2016 Every frost advisory in 2016

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.