ACUS11 KWNS 290302
SWOMCD
SPC MCD 290301=20
MTZ000-IDZ000-ORZ000-WAZ000-290430-

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 https://urldefense.com/v3/__http://www.spc.noaa.gov__;!!DZ3fj= g!4pbkvXJ3jjDvWvItxghRRwrWhr7uxHDo_juj39maR4JuDR2h4YKe-kRqY9cqlb8bGU0a_wrA_= o360svvUnGRPAB4E_c$ 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=20

MOST PROBABLE PEAK WIND GUST...55-70 MPH
MOST PROBABLE PEAK HAIL SIZE...1.00-1.75 IN


=3D =3D =3D
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