Mesoscale Discussion 1385
   NWS Storm Prediction Center Norman OK
   0720 PM CDT Tue Aug 28 2018

   Areas affected...Portions of Lower MI

   Concerning...Severe Thunderstorm Watch 358...

   Valid 290020Z - 290115Z

   The severe weather threat for Severe Thunderstorm Watch 358
   continues.

   SUMMARY...Mainly a strong to damaging wind threat continues across
   WW 358, although a tornado or two may also occur in the short term.

   DISCUSSION...A broken line of thunderstorms is moving eastward
   around 35-45 kt across much of Lower MI as of 0020Z. The airmass
   downstream of this convection remains weakly to moderately unstable,
   and 40-50 kt of effective bulk shear will likely support continued
   maintenance of these storms for at least the next couple of hours.
   Given the linear mode of the ongoing thunderstorms, strong to
   locally damaging winds should be the primary threat. 00Z sounding
   from Gaylord, MI show some veering/strengthening winds in the low
   levels, with measured effective SRH of 178 m2/s2. An embedded
   circulation within the line with a TDS signature occurred around
   2355Z in eastern Antrim County MI. Accordingly, another tornado or
   two cannot be ruled out in the short term (mainly across northern
   Lower MI in the vicinity of a front) given the low-level shear
   present ahead of the line.

   ..Gleason.. 08/29/2018

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

   ATTN...WFO...DTX...APX...GRR...

   LAT...LON   43318591 44738541 45198514 45198244 43568209 42568264
               42438618 43318591