The scorching heat wave continues to hold southwestern Connecticut in its sizzling grip today, but relief appears to be on the horizon after what could be a stormy day tomorrow.

In the meantime, however, there is an excessive heat warning in effect today, from 11 a.m. to 8 p.m., with the daytime high temperature soaring into the upper-90s under sunny skies -- and heat index values that could make it feel as though it is as hot as 106 degrees.

The oppressive heat also has triggered another air-quality alert, with the potential for unhealthy ozone levels.

Tonight will be partly cloudy, with a low temperature in the mid-70s.

The first signs of relief from this week-long heat wave should be felt tomorrow, with the NWS warning there is a 60 percent chance of showers and thunderstorms, mainly after 3 p.m. Some of the storms could produce gusty winds, heavy rain and frequent lightning. Skies otherwise will be partly sunny, with a high temperature in the low-90s.

There remains a 60 percent chance of storms tomorrow night -- again, some could be severe -- mainly before 10 p.m. Skies will be cloudy, with a low temperature about 70 degrees.

On Sunday, there is a 20 percent chance of showers and thunderstorms after noon. However, skies are expected to remain mostly sunny, with a high temperature in the mid-80s. Sunday night will be partly cloudy, with the temperature dipping to a low in the mid-60s.

Monday is expected to be partly sunny, with a high temperature about 80 degrees. Nighttime will be partly cloudy, with a low temperature in the mid-60s.

The outlook for Tuesday, according to the weather service, is partly sunny and temperatures about 80 degrees.