Storm Prediction Center issues Mesoscale Discussion #1693 concerning SEVERE THUNDERSTORM WATCH 506...508 [Most Prob: Tornado: 85-110 MPH, Hail: 1.00-1.75 IN, Gust: 55-70 MPH]835
ACUS11 KWNS 211909
SWOMCD
SPC MCD 211908
WVZ000-OHZ000-KYZ000-INZ000-212045-
Mesoscale Discussion 1693
NWS Storm Prediction Center Norman OK
0208 PM CDT Tue Jul 21 2026
Areas affected...portions of the middle and upper Ohio Valley
Concerning...Severe Thunderstorm Watch 506...508...
Valid 211908Z - 212045Z
The severe weather threat for Severe Thunderstorm Watch 506, 508
continues.
SUMMARY...Threat for all severe hazards continues across portions of
the middle and upper Ohio Valley. A gradual transition towards
damaging/severe wind gusts as the predominant hazard is then
expected through the afternoon.
DISCUSSION...Scattered convection with semi-discrete supercells has
developed along/ahead of an approaching cold front across portions
of the middle Ohio Valley with somewhat more isolated convection
also ongoing across western/central Ohio. The environment ahead of
these storms remains favorable for all severe hazards, especially
from eastern into southwestern Ohio where latest mesoanalysis
suggests effective SRH is greater and may support stronger
supercells in the near-term. Linear forcing along the front and
subsequent interactions between neighboring storms should then allow
for a transition into one or more clusters over the next 1-2 hours,
with a shift towards damaging/severe wind gusts as the main risk.
..Chalmers.. 07/21/2026
...Please see www.spc.noaa.gov for graphic product...
ATTN...WFO...PBZ...RLX...CLE...JKL...ILN...LMK...IND...PAH...
LAT...LON 38298742 38468724 38598672 38718603 38988522 39338439
39658381 40198301 40308271 40328220 40238163 40178125
40058088 39908074 39648075 39328100 38988139 38608204
38238268 37708379 37448446 37438597 37568674 37758714
38018735 38298742
MOST PROBABLE PEAK TORNADO INTENSITY...85-110 MPH
MOST PROBABLE PEAK WIND GUST...55-70 MPH
MOST PROBABLE PEAK HAIL SIZE...1.00-1.75 IN
Source:
Storm Prediction Center issues Mesoscale Discussion #1693 concerning SEVERE THUNDERSTORM WATCH 506...508 [Most Prob: Tornado: 85-110 MPH, Hail: 1.00-1.75 IN, Gust: 55-70 MPH]---------------
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