Mesoscale Discussion 348

Issued

Mar 27, 2017, 5:43 PM EDT (21:43 UTC)

Expired

Mar 27, 2017, 7:15 PM EDT

In force

92 min

Issued by

the Storm Prediction Center

The Louisville radar (KLVX), 112 km from the middle of the area, began a volume at 21:42 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.

• Severe Thunderstorm Watch 92Mar 27, 6:00 PM EDT

362 
ACUS11 KWNS 272143
SWOMCD
SPC MCD 272143 
KYZ000-VAZ000-TNZ000-NCZ000-GAZ000-INZ000-ALZ000-272315-

Mesoscale Discussion 0348
NWS Storm Prediction Center Norman OK
0443 PM CDT Mon Mar 27 2017

Areas affected...Central/eastern KY...Middle/eastern TN...Far
northern AL...Far northeast GA

Concerning...Severe Thunderstorm Watch 91...

Valid 272143Z - 272315Z

The severe weather threat for Severe Thunderstorm Watch 91
continues.

SUMMARY...Threat for damaging wind gusts and hail will persist
across central and eastern portions of WW 91 for the next few hours.
Trends will also be monitored for downstream watch issuance across
eastern KY/TN and far northwest GA.

DISCUSSION...Convective line stretching from near HNB (in far
southern IN) southward across central KY and middle TN and into
northwest AL is expected to continue moving eastward/northeastward
over the next few hours. The downstream airmass is generally cooler
and has less low-level moisture and, as a result, less overall
instability. However, the line is well-organized and the bulk shear
is expected to remain relatively constant for the next several
hours. Some increase in the low-level flow is possible around 00Z.
Near-severe gusts have been measured at several sites as the line
moved through, most recently at MQY in middle TN, which measured a
gust of 42 kt. The ongoing severe threat will persist across WW 91
for the next few hours, with some threat possible downstream in
eastern KY/TN and far northwest GA. Additionally, the cluster of
storms well ahead of the line in eastern KY could pose an isolated
hail and damaging wind threat. Trends will be monitored for possible
watch issuance in these areas downstream from the current watch.

..Mosier.. 03/27/2017

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

ATTN...WFO...GSP...MRX...JKL...FFC...ILN...LMK...OHX...HUN...
PAH...

LAT...LON   38278659 38838542 38648402 38358344 37558300 36078347
            34788450 35048789 38278659

Mesoscale Discussions in Kentucky, 2017Mesoscale Discussions in Tennessee, 2017Mesoscale Discussions in Indiana, 2017Every mesoscale discussion in 2017

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.