Alert archive / Tennessee / Frost Advisories in 2018
Frost Advisory 5, NWS Morristown, TN
NWS Morristown, TN issued this frost advisory at Oct 21, 2018, 3:35 AM EDT for 16 counties in Tennessee. It took effect at Oct 22, 2018, 2:00 AM EDT. It was in force for 7 hr.
The area
The counties it named.
The facts
- Issued
- Oct 21, 2018, 3:35 AM EDT (07:35 UTC)
- In effect from
- Oct 22, 2018, 2:00 AM EDT
- Expired
- Oct 22, 2018, 9:00 AM EDT
- In force
- 7 hr
- Issued by
- NWS Morristown, TN
Counties Anderson County, TN, Bledsoe County, TN, Blount County, TN, Bradley County, TN, Hamilton County, TN, Knox County, TN, Loudon County, TN, Marion County, TN, McMinn County, TN, Meigs County, TN, Monroe County, TN, Polk County, TN, Rhea County, TN, Roane County, TN, Sequatchie County, TN, Sevier County, TN
The radar
The Knoxville radar (KMRX), 129 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 191 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.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1854 m above ground
- 0-6 km bulk shear
- 59 kt
- 0-1 km storm-relative helicity
- 119 m²/s²
- 0-3 km storm-relative helicity
- -9 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
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 Oct 20, 7:40 PM EDT, 7 hours 55 minutes earlier.
Area forecast discussion, Oct 20, 7:40 PM EDT, 7 hours 55 minutes before
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</html>The office that day
Everything else NWS Morristown, TN issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Oct 21, 3:35 AM EDT | Freeze Warning | MRX | Blount, Campbell, Carter, Claiborne, Cocke, Grainger and 15 more | 29 hr |
Nearby
Frost Advisories in Tennessee, 2018Every frost advisory in 2018
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.