A line of thunderstorms developed Sunday evening in northern Illinois and have been moving southeast near 30mph.
The thunderstorms developed ahead of a cold front that resides along Lake Michigan to Kirksville, Missouri. The thunderstorms should continue to weaken as they move southeast in to central Indiana. While rain will be a high likelihood in Lafayette and Peru, it appears the line should quickly weaken and may not reach Indianapolis.
The cold front will begin to slowly move through Indiana Monday. Ahead of the front, humidity will remain high – dew points in the lower to middle 70°s. Showers and thunderstorms should begin to develop by mid-afternoon along and ahead of the front. The best chance for rain will be along and south of I-70.
Temperatures should be a few degrees cooler than Sunday. Highs should be in the upper 80°s to lower 90°s.
As previously mentioned, humidity will remain high for southern parts of the state. That means the heat index should get in to the upper 90°s to near 100° for places like Bedford, Bloomington, Columbus, and Seymour.
In Indianapolis, it should feel about 10° cooler than Sunday. Expect peak heat indices from 92° to 95°.
CUTTING THE HUMIDITY
Once the cold front passes central Indiana, drier air should begin to move in to central Indiana. This will allow for it to feel more comfortable, especially Tuesday and Wednesday.
Don’t get me wrong, it will still be warm, just not as hot as it was over the weekend. The heat index should top out in the upper 80°s to lower 90°s Tuesday and Wednesday.
WARMEST DAY OF 2016 — SO FAR
Sunday was the warmest day of the year in Indianapolis. The mercury climbed to 92°. The warmest
Central Indiana has definitely been in the midst of a mid-summer heat wave. Through 11pm Sunday, Indianapolis has been at or above 70°s for 154 consecutive hours. The last time Indianapolis was below 70° was 9:54am Monday, July 18.
COOLER AIR ON THE WAY
Long range computer models continue to advertise cooler air moving to central Indiana later this week and this weekend.