The National Weather Service has issued a Severe Thunderstorm Warning for Champaign and Logan counties until 3:30 a.m. this morning.

The National Weather Service has issued a Severe Thunderstorm Warning for Logan county until 2:45 a.m. this morning.

EXCESSIVE HEAT WARNING: Montgomery, Preble, Miami, Darke, Shelby, Mercer, Auglaize, Butler, Warren, Wayne, and Randolph from Noon - 9 PM Thursday. Heat index up to 109.

EXCESSIVE HEAT WATCH: Greene, Logan, Champaign, Clinton

QUICK-LOOK FORECAST:

• Excessive Heat Warning Thursday

• Heat Index up to 109 degrees

• Relief arrives this weekend

>>TRACK THE CONDITIONS: Live Doppler 7 Radar

DETAILED FORECAST:

OVERNIGHT: There is the outside chance that some storms try to make it to the Miami Valley by early Thursday... not a guarantee by any means. Warm and muggy. Lows in the low to mid-70s

THURSDAY: Dangerous heat expected Thursday. Regardless of the possibility of an early morning shower/storm, we see plenty of sunshine into Thursday afternoon. That sunshine and humidity combine for a very comfortable afternoon. Highs in the mid-90s. Heat index values up to 109 degrees possible. Take frequent breaks, and stay hydrated. We won’t get much relief from the warmth overnight as lows only fall to the mid/upper 70s.

FRIDAY: Heat continues on Friday. Highs in the lower 90s with continued humidity will make it feel like 95 to 100 degrees.

SATURDAY: Mostly sunny. More seasonable on Saturday with highs in the mid-80s.

SUNDAY: A great day. Mostly sunny with highs in the upper 70s. to lower 80s.

MONDAY: Partly cloudy. Highs in the lower 80s.

TUESDAY: Partly cloudy with a few showers and storms possible. Highs in the lower 80s.

WEDNESDAY: Partly cloudy. Cooler with highs in the mid-70s.