Earlier today we told you about a system that will effect portions of the central US. But how will it affect us here in Iowa? To recap, a large upper level low pressure system will come onshore on the west coast beginning early Monday and will push eastward with a surface low developing over Colorado. The low and cold front will push to the east through Thursday bringing a chance of severe weather and heavy rainfall totals to the central part of the United States.
Monday will be partly sunny with highs in the mid 50s. The rain will start to push into the state late Monday night and into the morning hours on Tuesday. As of now, temperatures should remain above freezing, so no snow is expected in the overnight hours. It is possible a few snowflakes could mix in, however, all rain is expected. What will need to be watched, is if the low moves further to the south, temperatures will be colder and then we could see some snow showers. There could be a break in the rain on Tuesday but as of now, it is hard to determine at what hour that will be with the inconsistency of the model runs. The low will continue to slide to the east on Wednesday, and this looks to be the best chance for rain.
A band of heavier precipitation stretching north to south across the state pushing to the east through the afternoon is anticipated during the day Wednesday. Lingering showers are possible on Thursday before the system finally pushes further to the east Thursday afternoon. Instability is fairly high for this time of year on Wednesday so it is likely that we will see some thunderstorms. However, no severe weather is expected at this time. Rainfall totals will be impressive with this system as totals will be between a half inch to an inch, with locally higher amounts possible in thunderstorms. After the system pushes though, the weekend will be dry with cooler temperatures, but seasonal for this time of year.