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Scattered showers and isolated thunderstorms continue to develop along an outflow boundary as storms continue to develop and move eastward through the early evening. Severe risk remains low, but brief periods of moderate rainfall and gusty winds to 40 mph remain possible. Isolated thunderstorms will continue through the early evening.
Very warm and muggy conditions are expected to fuel thunderstorms through evening. Storms will continue along the I-70 corridor this evening. Overnight another line of storm is expected to form after midnight between US 36 and I-70. These storms are capable of producing heavy rainfall. A flood watch is in effect for portions of eastern Missouri.
Little relief is expected from the heat as low temperatures are only expected to fall into the mid to upper 70s. This will magnify impact of the heat during the day. Watch for signs of heat stress and illness.