Mesoscale Discussion 0361
NWS Storm Prediction Center Norman OK
0540 PM CDT Wed Apr 02 2025
Areas affected...Portions of northeastern Illinois and northwestern
Indiana
Concerning...Tornado Watch 99...
Valid 022240Z - 030015Z
The severe weather threat for Tornado Watch 99 continues.
SUMMARY...Favorable corridor for tornadoes and damaging winds is
evident over the northern portion of Tornado Watch 99 from northeast
Illinois into northwest Indiana through at least 00Z.
DISCUSSION...A band of supercell clusters are tracking northeastward
from northeastern Illinois into northwestern Indiana. These storms,
along with warm-advection-driven evolving convection to the east,
are moving into an environment characterized by lower 60s dewpoints
and large clockwise-curved low-level hodographs (around 500 m2/s2
0-500m SRH per IWX VWP) along/south of the warm front draped across
northern Indiana. Despite a somewhat messy mode, this environment
may support an uptick in the intensity of supercell clusters over
the next hour or two, with an accompanying risk of tornadoes and
damaging wind gusts. Any supercells that can organize/intensify in
this zone would be capable of producing a strong tornado, though the aforementioned mode evolution casts uncertainty in this scenario
unfolding at this time.