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Forecast Discussion: Today, moderate easterly winds ahead of an approaching cold front will disperse pollutants in the Twin Cities, leading to Good AQI levels. Tomorrow, a cold front will pass through Minnesota, producing scattered showers and thunderstorms and keeping the atmosphere well-mixed. In addition, moderate westerly winds behind the departing cold front will transport a clean air mass into the region, limiting particle formation and keeping AQI levels Good. Friday and Saturday, as surface high pressure builds into the Dakotas, northwesterly winds will disperse pollutants in Minneapolis-St. Paul, yielding Good AQI levels on both days. Sunday and Monday, light to moderate southeasterly winds ahead of a weak low-pressure system over the western Plains will limit pollutant dispersion and gradually transport moisture and pollutants into the Twin Cities, enhancing particle production. Furthermore, an upper-level ridge of high pressure will limit vertical mixing in the atmosphere, trapping pollutants near the surface. Therefore, AQI levels will be Moderate on both days. |
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