A heat advisory remains in effect for Columbia County through 7 p.m. Friday.
The National Weather Service in Shreveport said the advisory is also in effect for Lafayette and Union counties, and adjacent North Louisiana parishes.
An upper level heat ridge remains for most of the Four State area on Friday and may expand back over all this weekend.
Highs temperatures will continue in the mid to upper 90s with heat index values ranging from 105 to 110 degrees. There will be limited relief overnight with lows into the mid and upper 70s.
High heat index readings will increase the risk of heat-related illnesses.
Widely scattered thunderstorms will be possible across some portions of Southwest Arkansas and North Central Louisiana this afternoon and early evening. However, no significant hazardous weather is expected.
Isolated to widely scattered thunderstorms will remain possible across southern Arkansas and northern Louisiana through the weekend, with some storms producing brief but very strong wind gusts.
Dangerously hot temperatures to continue mainly into the middle and upper 90s. This will lead to afternoon heat indices at or above 105 degrees.