Day 1 Convective Outlook CORR 1
NWS Storm Prediction Center Norman OK
0809 PM CDT Sat Jul 18 2026
Valid 190100Z - 191200Z
...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS ...
CORRECTED FOR INCORRECT CATEGORICAL LINES
...SUMMARY...
Storms capable of wind damage may continue for another hour or so
across central Pennsylvania before dissipating. Additional
strong-to-severe thunderstorms capable of damaging winds and hail
will be likely across portions western Montana
... 01Z Update ...
Overall thunderstorm intensity continues to wane across much of the
northeast with the loss of daytime heating and multiple rounds of
thunderstorms acting to stabilize the airmass. However, a few
damaging thunderstorm wind gusts will be possible from far eastern
Ohio into southern New England for perhaps another hour or two. The
most likely area for wind damage is across central Pennsylvania
where the most intense thunderstorms are currently found. These
storms should weaken further in the next couple of hours, bringing
an end to the organized severe threat.
Across western Montana, sufficient buoyancy is in place to support
ongoing convection, some of which has produced severe wind gusts
this afternoon. Steep lapse rates coupled with gradually
strengthening mid-level flow will support an ongoing severe threat,
including a couple of outflow-driven convective clusters. Please see
MCD #1656 for more details.
..Marsh.. 07/19/2026
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