Storm Prediction Center Mesoscale Discussion 1870

   Mesoscale Discussion 1870
   NWS Storm Prediction Center Norman OK
   0534 PM CDT Sat Aug 08 2026

   Areas affected...Northeast Connecticut...northern Rhode Island...and
   eastern Massachusetts

   Concerning...Severe Thunderstorm Watch 544...

   Valid 082234Z - 090030Z

   The severe weather threat for Severe Thunderstorm Watch 544
   continues.

   SUMMARY...Some threat for damaging/severe winds will likely persist
   into portions of eastern Massachusetts over the next 1-2 hours. A
   local expansion of WW 544 has been made to address this potential.

   DISCUSSION...A band of convection with a history of wind damage
   continues to move east across the New England region. Although the
   band has taken on a somewhat more pronounced bowing structure,
   latest radar imagery from KBOX shows the emergence of an outflow
   boundary on the southern flank of the line. This hints at some
   degree of weakening. However, surface observations downstream
   continue to show a warm and moist air mass in place that is
   supporting a pocket of MLCAPE between 1500-2000 J/kg. Additionally,
   the KBOX VWP is sampling 30-50 knot flow between 5-7 km AGL, which
   is yielding stronger deep-layer bulk shear than depicted by recent
   mesoanalyses. Consequently, is seems probable that this line will
   maintain some degree of intensity (especially on the northern flank)
   as it moves into eastern MA over the next 1-2 hours with some threat
   for damaging/severe winds (most likely peak gusts in the 45-60 mph
   range based on recent observations and the downstream environment).

   ..Moore.. 08/08/2026

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

   ATTN...WFO...BOX...

   LAT...LON   41927257 42207218 42447206 42457079 42017041 41747044
               41617046 41527069 41927257 

   MOST PROBABLE PEAK WIND GUST...UP TO 60 MPH