Central Iowa has a few weather concerns for the next 24 hours that range from heat to flash flooding.
All of us will deal with extreme heat and humidity. A large ridge of surface high pressure continues to sit over the Central US pumping in the heat and moisture. Temperatures started unusually warm with morning lows in the mid 70s. Our typical daytime high for today’s date is 74 degrees. From there temperatures will rise to the low 90s. Dew points will be in the upper 60s to low 70s, so it will feel very oppressive with heat index values in the upper 90s.
The next concern is flash flooding potential overnight in Northern Iowa. A Flash Flood Watch goes into effect at 7 PM and will last until 7 PM Thursday. The northern half of the state is a part of this watch. Thunderstorms which will be heavy rain producers are expected to develop in northern Iowa by early Thursday morning. Some storms may produce more than 2″ of rainfall. This will lead to some flash flooding on area streets and low lying areas.
A stationary front is in place along the Iowa-Minnesota border. The most active weather will stay closest to this front as significant tropical moisture continues to be pumped into the upper Midwest. Iowa will continue to remain in a southwest flow through the day Thursday and as weak disturbances roll through on Thursday, it will continue to bring periods of rain, mainly across northwest and northern Iowa.
The front is not expected to drop south, so we will remain in the warm humid sector the next few days. Temperatures will not be as high on Thursday, but we will still be in the 80s. We will hold in the mid 80s through the weekend with drier periods Friday and Saturday.
A stronger cold front is set to cross the state late Saturday night through Sunday morning. This will bring a line of rain across Iowa and some cooler temperatures in the 70s for next week.