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ACUS11 KWNS 290401
SWOMCD
SPC MCD 290400
ALZ000-TNZ000-MSZ000-MOZ000-ARZ000-290530-

Mesoscale Discussion 0935
NWS Storm Prediction Center Norman OK
1100 PM CDT Thu Jun 28 2018

Areas affected...Portions of eastern AR...western TN...and northern
MS

Concerning...Severe Thunderstorm Watch 237...238...

Valid 290400Z - 290530Z

The severe weather threat for Severe Thunderstorm Watch 237, 238
continues.

SUMMARY...An isolated threat for strong to damaging winds should
continue for another hour or two before diminishing. Additional
Severe Thunderstorm Watch issuance into northern MS is unlikely.

DISCUSSION...A long-lived squall line that produced widespread wind
damage across the mid MS Valley earlier today has finally begun to
show signs of weakening as it moves across parts of western TN and
vicinity. Still, recent velocity data from area radars and a few
observing stations have shown generally 35-45 kt wind gusts remain
possible with the strongest portion of the line in western TN as of
0355Z. An outflow boundary from prior convection has greatly limited instability across much of AL, with an instability gradient noted on
RAP mesoanalysis across eastern MS. With continued nocturnal cooling
tonight and strengthening convective inhibition, the overall wind
threat should continue to slowly diminish as the line moves into
northern MS. A local extension in area of WW 238 could be made in
northern MS, but additional Severe Thunderstorm Watch issuance is
not expected.

..Gleason.. 06/29/2018

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

ATTN...WFO...HUN...MEG...

LAT...LON 35549098 36499051 35988928 35758814 34898812 34588874
34689016 35049070 35549098



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