It's a fairly comfortable start to your Thursday, with low humidity and temperatures hovering in the 60s.
With record high temperatures and dew points in the 70s, risky heat index values in excess of 105 degrees are expected Sunday. The warning is in effect until 7 p.m. Heat index numbers (top line) may exceed 100° on Father's Day.
It's going to be toasty through the Father's day weekend, which means that you have to make sure you remain hydrated (with water) through at least Monday. Temperatures will be climbing into the low to mid 90s in most spots with very humid conditions, making it feel like it is around 100. While the morning is starting off pleasant, southerly winds through the day will bring a return to the heat and humidity. As this front moves to the southeast, slowly, showers and storms will be possible along the front in central and southwestern Kansas, mainly late in the afternoon through the evening.
Excessive Heat Warning for STL through Monday
SUNDAY EVENING: Mostly cloudy, warm and breezy with a 20% chance for isolated showers or thunderstorms. As daytime heating kicks in again, storms will become likely by midday and last through the mid part of the afternoon.
Combine those highs with dew points and heat index numbers climb into the mid 90s to even triple-digits during peak heating hours. We'll keep rain chances near 30%, which is close to our average summertime rain chance.
While a couple storms could produce gusty winds and small hail, organized severe weather is not expected.
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