After a stretch of dry weather, we have some good news to report this morning. There is a good chance for heavy rainfall totals tonight into the day on Friday. Thunderstorms will develop in Western Iowa late this afternoon and into the evening and will move across the rest of the state tonight. A few of these storms could be strong to severe this evening with large hail and damaging winds the primary threats, mainly in western Iowa. Overnight, the severe threat will taper off but storms will be capable of producing locally heavy rainfall. Rainfall totals will be at least a quarter of an inch in much of the state with isolated higher amounts around an inch. Higher rainfall totals will be more common in southwestern Iowa.
Thunderstorms will linger on into the day of Friday, mainly south of highway 30. They will then slowly move out later in the day. No severe weather is expected on Friday. Friday night a large Canadian surface high pressure system will move southward towards the state of Iowa, bringing dry and cooler weather for most of the weekend. This area of high pressure will continue to push eastward and as it does, our next system will approach from the Dakotas. As this system passes, there is a chance it could generate more showers and thunderstorms from late Sunday into Monday, however, moisture will be more limited so any rain we do see will be light.
We will continue to track the chance for severe weather this afternoon on our facebook page and right here at Iowachase.com.