Next heatwave forecast until Friday, at least

(TULSA, Okla.) The main forecast concern for the next several days is the heat and humidity. Another Heat Advisory was issued for Monday, this time for the entire forecast area. Depending on dew point trends, an Excessive Heat Warning may be needed for a few spots again Monday but will let the mid shift have another look at that Sunday night.

A few showers and thunderstorms developed Sunday, largely tied to the terrain in Arkansas, as well as the northern edge of an enhanced cu field across southeast and east central Oklahoma. Dew points remained fairly high Sunday, due in part to recent rains and also winds that kept a notable easterly component in most spots. 

Low level winds shift more westerly Monday, which should lead to lower dew points than we saw Sunday. Despite this, dew points from the blended guidance look too low, especially across western parts of the forecast area. This combination leads to at least 105-degree heat index values across much of the area, including the climatologically less favorable far northwest Arkansas counties.

The trend should be toward lower dew points and hotter temperatures for Tuesday and Wednesday, with the position of the upper high favoring Wednesday for the warmest day of the period. Conditions remain likely to improve late in the week and into next weekend as the position of the ridge shifts and cloud cover and rain chances increase. Expect additional heat advisories through at least Wednesday and likely Thursday as well.

Monday

Sunny, with a high near 93. Heat index values as high as 101. Southwest wind around 5 mph.

Monday Night

Mostly clear, with a low around 73. South wind around 5 mph.

Tuesday

Sunny, with a high near 94. South wind 5 to 10 mph.

Tuesday Night

Clear, with a low around 73. South wind around 5 mph becoming calm after midnight.

Wednesday

Sunny, with a high near 94. Calm wind becoming south around 5 mph in the morning.

Wednesday Night

Mostly clear, with a low around 73. Southeast wind around 5 mph.

Thursday

Sunny, with a high near 92. Southeast wind around 5 mph.

Thursday Night

Mostly clear, with a low around 71. Southeast wind around 5 mph.

Friday

Sunny, with a high near 89. South wind around 5 mph.

Friday Night

Mostly clear, with a low around 71. Southeast wind around 5 mph.

Saturday

A 20 percent chance of showers and thunderstorms. Sunny, with a high near 88. South wind 5 to 10 mph.

Saturday Night

Mostly clear, with a low around 70. Southeast wind around 5 mph.

Sunday

A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 86. South wind around 5 mph.