Excessive Heat Warning through Thursday. Mostly sunny, hot and humid.
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HEADING TO 100 DEGREES
Excessive heat warnings and heat advisories will remain in effect through today and tomorrow. Temperatures are on their way to reaching triple digits for much of southern Missouri and northern Arkansas this afternoon. The heat index could approach 105 degrees in the advisory areas and may reach nearly 110 degrees in the warned areas to the north and to the west in the Ozarks.
The upper level high pressure that is currently in control will flatten out a bit aloft and a surface front could move into northern Missouri. Moisture will also increase throughout the atmosphere at that point. All of that will allow for the possibility of some thunderstorms by Friday afternoon. There will continue to be a chance for rain and thunderstorms on Saturday and Sunday also.
Temperatures are expected to be a little cooler for Friday and Saturday but still plenty hot and humid. Highs will likely warm into the low to mid 90s during that time frame. The upper level high will then build and expand northward next week which will cause temperatures to warm back to near 100 degrees for at least a few days.