Alert archive / Tennessee / Frost Advisories in 2014

Frost Advisory 3, NWS Morristown, TN

April 16, 201425 counties in Tennessee

NWS Morristown, TN issued this frost advisory at Apr 16, 2014, 3:36 AM EDT for 25 counties in Tennessee. It took effect at Apr 17, 2014, 4:00 AM EDT. It was in force for 5 hr.

The area

The counties it named.

The facts

Issued: Apr 16, 2014, 3:36 AM EDT (07:36 UTC)
In effect from: Apr 17, 2014, 4:00 AM EDT
Expired: Apr 17, 2014, 9:00 AM EDT
In force: 5 hr
Issued by: NWS Morristown, TN

All 25 counties

Anderson County, TN, Bledsoe County, TN, Blount County, TN, Bradley County, TN, Campbell County, TN, Claiborne County, TN, Cocke County, TN, Grainger County, TN, Hamblen 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, Scott County, TN, Sequatchie County, TN, Sevier County, TN, Union County, TN

The radar

The Knoxville radar (KMRX), 92 km from the middle of the area, began a volume at 07:35 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 00:00Z, 7.6 hours before the alert went out and 209 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: 1746 m above ground
0-6 km bulk shear: 42 kt
0-1 km storm-relative helicity: 27 m²/s²
0-3 km storm-relative helicity: 41 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 Apr 15, 3:10 PM EDT, 12 hours 26 minutes earlier.

Area forecast discussion, Apr 15, 3:10 PM EDT, 12 hours 26 minutes before

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Hazardous weather outlook, Apr 15, 3:45 PM EDT, 11 hours 51 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
Apr 16, 3:36 AM EDT	Freeze Warning	MRX	Blount, Carter, Cocke, Greene, Hancock, Hawkins and 6 more	29 hr

Nearby

Frost Advisories in Tennessee, 2014 Every frost advisory in 2014

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.