Tuesday, April 4, 2023

Day 2 of Des Moines, IA (KDSM)

After thick clouds in the morning, the warm front finally pushed to the north in the afternoon, allowing for a rapid, last-minute warm up as expected, with a high of 76F. Surprisingly though, it did not get any warmer, and winds never really turned southerly. The true hot air remained just to the south. It has not been as windy as expected so far, but there could still be a brief period of strong winds with approaching strong showers and thunderstorms ahead of the cold front mixing down strong winds from aloft. It will cool down rapidly afterward with winds switching to westerly before 06z. Given the strength of the cold air mass behind the front, most models are likely too gradual with the initial temperature drop, leading to a lower than modeled high temperature (at the beginning or Wednesday 06z). It will be windy and dry with increasing sunshine through the day tomorrow with the sunshine battling cold advection leading to slowly rising temperatures, and the daytime heating allowing for mixing of strong winds from aloft. Winds will weaken tomorrow night to borderline favorable or still a tad too strong for ideal radiational cooling, but the low will still be at the end (Thursday 06z) given the colder air mass having established by then.

Source: NWS

Source: RadarScope

Source: Wunderground

Source: PivotalWeather

Source: PivotalWeather


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