Derived CAPE:
In our per-analysis there was a nose of stronger CAPE moving NE through E Nebraska, W Iowa towards the southern part of our CWA (Grand Forks).
During our warnings, around 2342Z, our southernmost cell was the strongest. We went back to Derived CAPE and observed that nose of higher CAPE was finally intruding into our southern sections, and hence starting to affect that storm.
IR 10.25:
Simultaneously, IR 10.35 was showing that storm was the one with the coldest top.
IR 0.64:
Showed the updraft very well.
Davis Nolan
WKRN Meteorologist
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