By: Stephen McCoy - @stephenmmcc
On Friday, a warm front extending from a surface low pressure system over the northern Great Plains is expected to track eastward through Missouri; the front will bring a likely chance for showers through much of the day. Breezy conditions with some stronger gusts are possible just ahead of the front as it forces winds to the north towards the center of the low pressure system. Drier air will move into the area behind the front, causing partly cloudy conditions into the evening and night. As was mentioned in the previous forecast, the timing of the frontal passage will largely determine the high temperature for the day, with an early passing creating warmer temperatures, but cooler temperatures with a later passage; for the moment, the model average indicates around 80 degrees.
On Saturday, warm air at the surface will move in behind the front, with winds from the south to southwest bringing moisture to the region from the Gulf Coast. In the upper levels, a slight high pressure ridge is expected to build in after the passage of the shortwave trough. This will trap heat at the lower levels and surface, resulting in much warmer temperatures than Friday, with highs in the low to mid 90's. With the moisture from the Gulf, dew point temperatures are expected to be in the low 70's, causing the heat index to reach or even exceed 100 degrees. Again, with the Indycar series race starting in the evening, temperatures will cool as the night progresses. Drier air in the low levels will keep conditions partly cloudy through much of the day.
One thing to note for Saturday is there is a slight chance for scattered showers in the mid morning to early afternoon, but there should be no impact to the day's races. However, if there is a trend towards showers occurring later in the day, it will be noted in the next forecast update.
On Saturday, warm air at the surface will move in behind the front, with winds from the south to southwest bringing moisture to the region from the Gulf Coast. In the upper levels, a slight high pressure ridge is expected to build in after the passage of the shortwave trough. This will trap heat at the lower levels and surface, resulting in much warmer temperatures than Friday, with highs in the low to mid 90's. With the moisture from the Gulf, dew point temperatures are expected to be in the low 70's, causing the heat index to reach or even exceed 100 degrees. Again, with the Indycar series race starting in the evening, temperatures will cool as the night progresses. Drier air in the low levels will keep conditions partly cloudy through much of the day.
One thing to note for Saturday is there is a slight chance for scattered showers in the mid morning to early afternoon, but there should be no impact to the day's races. However, if there is a trend towards showers occurring later in the day, it will be noted in the next forecast update.
