With unseasonably warm days early in spring, sometimes you get an unstable air mass, that becomes unpredictable. That’s what we’re seeing tonight, with this line of showers and thunderstorms, that resemble something you might expect to see in mid May, rather than mid March.
8pm Radar Loop
Guidance didn’t pick up on this threat until the last minute, and its caught just about everyone by surprise. The frontal boundary that will shift the winds out of the northwest tonight, and bring us a return to some seasonably cold air… has capitalized on unseasonably warm, moist air mass. The clash of air masses, has provided the perfect area for development of this line of thunderstorms. Wind gusts over 50mph, and small hail have been indicated on radar, as well as locally heavy rains. Likely the most notable feature is the frequent lightning associated with some of the storms, that is providing quite the light show for our southern viewers.
Unfortunately, this comes with some undesirable consequences. Reports of low visibility, due to warm advection fog… resulting from the warm air over areas of cold snow pack and heavy rain. Clogged drains are also leading to areas of urban flooding, and ponding on roadways, so be sure to use extra caution while driving tonight.
This line of showers and thunderstorms should exit the region over the next hour or two, clearing the region entirely before midnight. Areas over 1″ of rain can’t be ruled out, with these downpours continuing over the same areas for an extended period of time.