Today and this weekend's forecast will largely be driven by a large mid-level trough located in western Canada. As shown in the mid-level 500 mb vorticity map below, the main trough is along the Canada/Montana border. However, embedded in the flow are several smaller shortwave low pressure systems. This will be the story today and tomorrow. As the upper trough …

Andy

Andy

Born and raised in St. Louis, Andrew obtained a Ph.D. in Atmospheric Science from the University of Colorado in 2015. From 2015 to 2020, he worked remotely in Boulder as an atmospheric scientist with NOAA's Atlantic Oceanographic and Meteorological Laboratory in Miami. Andy is now a full-time meteorologist.

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