Mesoscale Discussion 1051

Issued

Jun 21, 2021, 3:03 PM CDT (20:03 UTC)

Expired

Jun 21, 2021, 5:00 PM CDT

In force

117 min

Issued by

the Storm Prediction Center

Concerning

Severe thunderstorm watch 301

The Nashville radar (KOHX), 130 km from the middle of the area, began a volume at 20:06 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.

237 
ACUS11 KWNS 212004
SWOMCD
SPC MCD 212003 
KYZ000-VAZ000-TNZ000-212200-

Mesoscale Discussion 1051
NWS Storm Prediction Center Norman OK
0303 PM CDT Mon Jun 21 2021

Areas affected...Northern Tennessee and central to eastern Kentucky

Concerning...Severe Thunderstorm Watch 301...

Valid 212003Z - 212200Z

The severe weather threat for Severe Thunderstorm Watch 301
continues.

SUMMARY...The severe threat continues across WW 301. Damaging wind
gusts remain the primary hazard, but instances of severe hail will
remain possible through the late afternoon.

DISCUSSION...Thunderstorms continue to develop along the surface
cold front across KY and middle TN with only loose storm
organization noted in regional radar imagery. In general, the
somewhat weak and along-boundary shear is promoting numerous storm
interactions that are limiting the severe threat to some degree.
However, east/northeasterly 30 knot 0-3 km shear is noted in
regional VWPs, suggesting that any north-south oriented cluster may
become organized and pose a more robust damaging wind risk. New
convective development is also noted ahead of the front within the
open warm sector - primarily being driven by weak low-level theta-e
advection and parcels reaching their convective temperatures as
highs climb into the mid/upper 80s. This convection has primarily
been discrete but short-lived with transient strong updrafts. Given
favorable instability (around 2000 J/kg MLCAPE), this activity may
pose a brief hail risk as well as a damaging wind risk amid
low-level lapse rates between 7-8 C/km. In general, the severe
threat should continue across northern TN and east/southeast KY for
the next few hours.

..Moore.. 06/21/2021

...Please see www.spc.noaa.gov for graphic product...

ATTN...WFO...MRX...JKL...LMK...OHX...

LAT...LON   36028730 36528679 37178627 37588539 37708444 37648339
            37378309 36878289 36588335 36298427 35838482 35738520
            35738609 35758694 36028730

Mesoscale Discussions in Kentucky, 2021Mesoscale Discussions in Tennessee, 2021Every mesoscale discussion in 2021

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.