Heat and humidity jump Sunday, hottest air of season could bring storms

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RPM forecast Sunday night


We will be waking up to a chill in the air with the coolest morning here in almost 3 weeks.  The Saturday morning temperatures fell into the 40s away from city. The  low of 52° in city was no record but only the 4th time ever this cool beyond June 14th and in the ‘summer’ months.


Low temps coolest in nearly 3 weeks


This is dry air so it rebounds quickly from those early morning low temperature, up nearly 30° in some spots.  The humidity was only 35 percent at 3 PM Saturday with temps creeping into the upper 70s.


Saturday 3 PM temperatures


The humidity will surge in the next 24 hours as winds shift and a warm front passes the city between 9 AM and 12 noon Sunday.  The dew point temperature climbs as east winds turn south and gulf moisture returns.

The dew point (measure of moisture in the atmosphere) is the real gauge as to how ‘humid’ the air is.  When it moves above 60° like it will Sunday afternoon it becomes stickier – the return of air found in the south.  The higher that number goes the more uncomfortable it gets.


Humidity to rise quickly Sunday



Scanning weather records back to 1950 – 57 percent of those have had rainfall.  Most Father’s Days are warm with nearly 50 percent in the 80s.  Only 10 days were in the 90s with a high of 96° back in 1954.  The coolest Father’s Day was most recently 66° in 1992 and again in 1974.



A nasty night of severe storms is possible across portions of the Central Plains later this evening and tonight.  Severe storm and tornado watches are to be hoisted later this evening and tonight.

Central Indiana will remain dry for the rest of the weekend but there is a chance a few storms make their way into the state late Sunday evening or overnight into Monday morning. The SPC (Storm Prediction Center) has included a portion of western Indiana in a ‘slight’ risk of severe storms late Sunday.  Should storms that form west of the state late Sunday afternoon or evening hold they could reach us late night.  We will monitor.

DAY 2 SPC Forecastv Sunday

Day 2 severe outlook Sunday


RPM forecast Sunday night