A break from the heat on Monday, then excessive heat returns

(TULSA, Okla.) Well, it’s still hot, but at least it’s not 120-degree heat index hot like we saw Saturday across eastern Oklahoma. Slightly cooler and drier air started to filter into far northeast Oklahoma/northwest Arkansas Sunday afternoon behind the front. Further south, across far southeast Oklahoma, where low level moisture remains, heat indices climbed into the 105-107-degree range. A brief break from the excessive heat is expected on Monday across most of the area with increased cloud cover, including a few isolated thunderstorms possible in the warm advection regime. The warming trend returns for the remainder of the week as an upper ridge begins to build into the southern Plains. Given the recent rainfall over the past few days, dew-points are expected to be higher. This will likely push heat indices back into the 105-110 degree range each afternoon Thursday through Sunday with little chance for rainfall. Unfortunately, no real relief from the heat is expected in the 7 to 10-day range either, as upper high continues to dominate the overall weather pattern. Monday A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 91. Southeast wind 5 to 10 mph. Monday Night Partly cloudy, with a low around 78. Southeast wind 5 to 10 mph. Tuesday Mostly sunny, with a high near 98. Heat index values as high as 106. South wind around 10 mph. Tuesday Night Partly cloudy, with a low around 79. South wind 5 to 10 mph. Wednesday Partly sunny, with a high near 98. Southwest wind around 5 mph. Wednesday Night Mostly cloudy, with a low around 78. South wind around 5 mph. Thursday Partly sunny, with a high near 98. South wind around 5 mph. Thursday Night Partly cloudy, with a low around 77. South wind around 5 mph. Friday Sunny, with a high near 99. South wind 5 to 10 mph. Friday Night Mostly clear, with a low around 78. South wind 5 to 10 mph. Saturday Sunny, with a high near 99. South wind 5 to 10 mph. Saturday Night Mostly clear, with a low around 78. South wind 5 to 10 mph. Sunday Sunny, with a high near 99. South wind 5 to 10 mph.