Mesoscale Discussion 0890 NWS Storm Prediction Center Norman OK 1001 PM CDT Thu May 28 2026 Areas affected...central and eastern Washington into the Idaho Panhandle and northwest Montana Concerning...Severe Thunderstorm Watch 249... Valid 290301Z - 290430Z The severe weather threat for Severe Thunderstorm Watch 249 continues. SUMMARY...The potential for severe weather continues across the watch area. Through 04 UTC, the highest probability of severe-weather occurrence is expected across portions of eastern Washington into central and northern parts of the Idaho Panhandle. Hail up to 1.25" and locally severe wind gusts of 60-70 mph will be the primary hazards. DISCUSSION...The interaction of two separate thunderstorm clusters has lead to widespread cold pool generation across eastern WA and the central ID Panhandle as of 0250 UTC. Recent radar trends suggest that the cold pool strength is much greater than the ambient, low-level shear, resulting in storms becoming undercut and gradually weakening. However, that process is yielding channels of stronger winds, which are being sampled by the KOTX radar, suggesting the potential for wind gusts up to 60-70 mph. Elsewhere, storms are gradually increasing in areal coverage across south-central WA, presumably along outflow moving north from OR, with the downstream air mass over central WA remaining quite warm and unstable. As such, some potential exists for cold pool organization with that activity, and given the presence of DCAPE values of 1000-1500 J/kg (per objective analysis), an associated risk for damaging wind would exist with further storm intensification. ..Mead.. 05/29/2026 ...Please see www.spc.noaa.gov for graphic product... ATTN...WFO...TFX...MSO...OTX...PDT...SEW... LAT...LON 46051743 46031948 45752088 45892129 46892134 47942109 48602083 49002080 49011407 48041308 47251316 46671276 46341309 46071348 45451477 45211523 45281645 45831656 46051743 MOST PROBABLE PEAK WIND GUST...55-70 MPH MOST PROBABLE PEAK HAIL SIZE...1.00-1.75 IN
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