Des Moines is the destination for today’s forecast. I was just there for Easter, so I feel like I should have their forecast pretty well locked down.
At 936AM, CT, Des Moines was reporting a temperature of 68 degrees with overcast skies. While there was no rain presently seen in the Des Moines area, a batch of activity was moving through the Omaha area, and overcast riding over the top of a tropical airmass was shifting north behind a warm front, and smothered most of the Upper Midwest, particularly east of the Missouri. There was a strong ridge over the eastern 3/4ths of the US, but a weak undercutting trough was providing for some rough weather in the south central US, and the exit arm of the trough was helping usher in the soupier air mass across Iowa.
The undercutting trough is expected to fold back into the primary jet, while the surface ridge should start to retrograde a little over the next 24 hours. This will strengthen the return flow, and only stand to make Iowa more humid. A Canadian trough will dangle a cold front into Minnesota, but it won’t be strong enough to organize much convective activity in Iowa, however the latent moisture of the area, along with the brisk flow on the back end of the ridge in the Eastern United States will be enough to provide for garden variety showers and isolated storms through the day tomorrow and into the early afternoon on Friday. The ridge will build in at a more fortunate angle to dissuade more moisture from driving into Iowa, and it should switch off the threat for storms by nightfall.
Tomorrow – Scattered showers and thunderstorms, otherwise stuffy and partly cloudy, High 75, Low 63
Friday – Showers and storms early, then clearing but still muggy, High 80, Low 65
TWC: Tomorrow – Mixed clouds and sun with scattered thunderstorms High 76, Low 65
Friday – Scattered thunderstorms, especially in the afternoon. High 80, Low 66
AW: Tomorrow – Cloudy; a couple of morning thunderstorms followed by a shower in the afternoon High 74, Low 64
Friday – Remaining cloudy with a couple of thunderstorms High 81, Low 66
NWS: Tomorrow – A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 2pm. Cloudy, High 76, Low 64
Friday – A 40 percent chance of showers and thunderstorms, mainly before 2pm. Partly sunny, High 82, Low 66
WB: Tomorrow – Showers likely and a chance of thunderstorms. High 73, Low 64
Friday – Partly sunny with a 40 percent chance of thunderstorms, High 78, Low 66
WN: Tomorrow – Mostly cloudy with light showers likely, High 76, Low 64
Friday – Partly cloudy, High 81, Low 68
FIO: Tomorrow – Possible light rain until afternoon. High 77, Low 65
Friday – Mostly cloudy throughout the day. High 79, Low 67
This is a real summer time pattern. An open flow from the Gulf, but no real organization to do anything with it. It’s early in the season, so it seems glum, but it should warm up pretty quick when the sun comes out.