Alert archive / Tennessee / Flash Flood Watches in 2018
Flash Flood Watch 4, NWS Morristown, TN
NWS Morristown, TN issued this flash flood watch at Jul 31, 2018, 3:35 AM EDT for 9 counties in Tennessee; Cherokee County, Clay County, North Carolina. It took effect at Aug 1, 2018, 8:00 AM EDT. It was in force for 48 hr.
The area
The counties it named.
The facts
- Issued
- Jul 31, 2018, 3:35 AM EDT (07:35 UTC)
- In effect from
- Aug 1, 2018, 8:00 AM EDT
- Expired
- Aug 3, 2018, 8:00 AM EDT
- In force
- 48 hr
- Issued by
- NWS Morristown, TN
- Flood severity
- None
Counties Cherokee County, NC, Clay County, NC, Blount County, TN, Carter County, TN, Cocke County, TN, Greene County, TN, Johnson County, TN, Monroe County, TN, Polk County, TN, Sevier County, TN, Unicoi County, TN
The radar
The Knoxville radar (KMRX), 48 km from the middle of the area, began a volume at 07:36 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
Peachtre/Fal Fld, GA (KFFC), launched 00:00Z, 7.6 hours before the alert went out and 286 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
- 1645 J/kg
- Mixed-layer CIN
- -2 J/kg
- Mixed-layer LCL
- 939 m above ground
- 0-6 km bulk shear
- 18 kt
- 0-1 km storm-relative helicity
- 42 m²/s²
- 0-3 km storm-relative helicity
- 32 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.7
The office that day
Everything else NWS Morristown, TN issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 31, 3:40 PM EDT | Special Weather Statement | MRX | McMinn, Monroe | 35 min |
| Jul 31, 4:23 PM EDT | Areal Flood Warning | MRX | Bradley, McMinn | 3 hr |
| Jul 31, 5:56 PM EDT | Special Weather Statement | MRX | Hamilton | 49 min |
| Jul 31, 7:24 PM EDT | Areal Flood Advisory | MRX | Bledsoe, Meigs, Rhea | 3 hr |
Nearby
Flash Flood Watches in Tennessee, 2018Flash Flood Watches in North Carolina, 2018Every flash flood watch 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.