Storm approaches Wausau -- note pressure drop and lowering cloud base. With winds from the south, temperatures continue to rise through the day and into the night. 

Temperature rise continues through the night until cold front passes at 12Z -- note temp drop and wind veer and rising pressure. With winds from the north, temperatures continue to drop throughout the day.

Finally, we see the influence of the new low pressure center developing in Missouri along the wave front -- pressure has started to drop at 08Z and clouds have formed.