Alert archive / Tennessee / Areal Flood Warnings in 2021

Areal Flood Warning 23, NWS Morristown, TN

March 31, 20214 counties in Tennessee

NWS Morristown, TN issued this areal flood warning at Mar 31, 2021, 1:31 PM EDT for 4 counties in Tennessee. It was in force for 6 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Mar 31, 2021, 1:31 PM EDT (17:31 UTC)
Expired
Mar 31, 2021, 8:00 PM EDT
In force
6 hr
Issued by
NWS Morristown, TN
Area
Storm-based polygon
Flood severity
None

Counties Bradley County, TN, Hamilton County, TN, Marion County, TN, Sequatchie County, TN

The radar

The Northeast Alabama radar (KHTX), 81 km from the middle of the area, began a volume at 17:31 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, 5.5 hours before the alert went out and 158 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-pSkew-T log-p diagram, Nashville Metro, TN at 12:00Z on 2021-03-31Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Nashville Metro, TN at 12:00Z on 2021-03-31The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 80 square meters per square second.1939587897Sfc1 km3 km6 km9 kmRMLM
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
498 m above ground
0-6 km bulk shear
52 kt
0-1 km storm-relative helicity
80 m²/s²
0-3 km storm-relative helicity
201 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.1

Open this sounding in Storm Lab

The office that day

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

IssuedProductOfficeCountiesLasted
Mar 30, 9:37 PM EDTWind AdvisoryMRXBlount, Carter, Cocke, Greene, Johnson, Monroe and 2 more15 hr
Mar 31, 4:57 AM EDTAreal Flood AdvisoryMRXMarion2 hr
Mar 31, 5:40 AM EDTAreal Flood AdvisoryMRXBradley, Hamilton3 hr
Mar 31, 7:57 AM EDTAreal Flood AdvisoryMRXMarion46 min
Mar 31, 8:42 AM EDTFlash Flood WarningMRXBradley, Hamilton, Marion, Sequatchie5 hr
Mar 31, 8:52 AM EDTAreal Flood AdvisoryMRXBlount, Jefferson, Loudon, Sevier5 hr
Mar 31, 8:59 AM EDTAreal Flood AdvisoryMRXBledsoe, Rhea, Sequatchie4 hr
Mar 31, 9:05 AM EDTAreal Flood AdvisoryMRXMonroe5 hr
Mar 31, 9:52 AM EDTAreal Flood AdvisoryMRXMonroe, Polk3 hr
Mar 31, 10:55 AM EDTRiver Flood WarningMRXBledsoe, Marion, Sequatchie35 hr
Mar 31, 10:57 AM EDTRiver Flood WarningMRXHamilton47 hr
Mar 31, 12:46 PM EDTRiver Flood WarningMRXCocke22 hr
Mar 31, 2:04 PM EDTRiver Flood WarningMRXPolk14 hr
Mar 31, 3:38 PM EDTFreeze WatchMRXAnderson, Bledsoe, Blount, Bradley, Campbell, Carter and 25 more18 hr
Mar 31, 3:38 PM EDTFreeze WarningMRXAnderson, Bledsoe, Blount, Bradley, Campbell, Carter and 25 more17 hr
Mar 31, 3:38 PM EDTWind AdvisoryMRXBlount, Carter, Cocke, Greene, Johnson, Monroe and 3 more12 hr

Nearby

Areal Flood Warnings in Tennessee, 2021Every areal flood warning in 2021

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.