ZCZC SPCSWOMCD ALL ACUS11 KWNS 110425 SPC MCD 110425 INZ000-ILZ000-110600- Mesoscale Discussion 2002 NWS Storm Prediction Center Norman OK 1025 PM CST Fri Dec 10 2021 Areas affected...much of Indiana Concerning...Tornado Watch 557... Valid 110425Z - 110600Z The severe weather threat for Tornado Watch 557 continues. SUMMARY...The severe threat continues across Tornado Watch 557, and may progress eastward across much of Indiana. Damaging gusts are expected to be the main threat across northern into central Indiana, with a couple of brief tornadoes possible across southern Indiana. An additional Tornado Watch issuance may be needed in southern Indiana. DISCUSSION...A broken line of storms, including occasional embedded supercells, persists across central and eastern parts of Tornado Watch 557. Mainly strong/damaging gusts have been observed over the past couple of hours, though a TDS (suggesting the presence of a tornado) has recently been noted in Coles, County IL. Across Indiana, a near saturated low-level airmass is in place, with surface observations showing both temperatures and dewpoints in the mid to upper 50s F in northern/central IN, with lower 60s F temperatures/dewpoints observed in southern IN. Given the modest low-level temperatures and mid-level lapse rates, buoyancy is currently poor across IN, with modest convective inhibition in place. Since low-level airmass recovery is not expected to be overly robust across northern/central IN, near-surface based storms may support occasional strong to damaging wind gusts. A relatively greater threat for damaging gusts and perhaps a couple of tornadoes may develop farther south in southern IN where the richer low-level moisture is in place. A downstream Tornado Watch may be needed in southern IN. ..Squitieri/Grams.. 12/11/2021 ...Please see www.spc.noaa.gov for graphic product... ATTN...WFO...ILN...LMK...IWX...IND...LOT...ILX... LAT...LON 38688735 40058754 40978735 41338701 41438673 41488650 41518625 41508576 41368548 40878502 40438490 39958495 39318502 38978516 38788608 38688735 NNNN