For the first time this year, the dew point surged to 77-degrees in Indianapolis. That is an incredibly high number and more typical for the Tropical Rain forest of Central America. We rarely have dew points this high, and when we do, the heat index hits dangerous levels. Shortly before 3 p.m. Monday, the heat index reached 100-degrees in Indianapolis — the highest since last July.
Locally, heavy downpours are ending as we’ve past peak heating of the day. Heavy rainfall occurred Monday with isolated totals of over 1″. The highest rainfall estimate was found in southern Madison County. Note that most official reporting stations did not record rainfall Monday.
Scattered showers and a few thunderstorms are in the mix for the next two days, but they are selective and are not area-wide. While there is the threat of rain, any storm that does move overhead can and will produce heavy amounts and drenching downpours. Again, the coverage here is limited and will likely hit its peak Tuesday before dropping through the rest of the week.
The jet stream is buckling, and a dome of heat is expanding across the heart of the nation later this week and expanding into the holiday weekend. High temperatures are likely to top 90-degrees starting Thursday and extend well into next week. Combined with unrelenting humidity, the heat index could be near 100-degrees for several days.