T-storms target parts of Indiana overnight; Cooler for Mother’s Day
Good Saturday evening! Sct showers kept temps from rising (only officially 70° in Indianapolis) but have also prevented thunderstorms from developing. The showers that settle south this evening are not in unstable air and rain chances look limited.
The most unstable air is in southwest Indiana just before 5 PM and would support t-storm development. We could see an up tick in storm activity by 8 PM per latest short range modeling.
There is a cluster of storms forming near St. Louis and may track east tonight. Overnight showers and storms are most likely to develop as a nighttime jet stream kicks in, spread the storm complex into southwest Indiana. Shortly before 5 p.m., a Severe Thunderstorm Watch was issued for a large portion of southern Illinois. Most of the rain overnight will target the southern quarter of the state.
A passing front will freshen up the breeze from the northwest this evening and temperatures will cool into the 40s along and north of the stalling cold front early Sunday morning. The clouds may be rather persistent into late morning and early afternoon and along with the front a few light rain showers are possible for Mother’s day. There will be plenty of rain free time. Coverage of rain wil likely be at its peak around daybreak at 31% the slip back by early afternoon. New showers and storms are likely again overnight Sunday into Monday morning.