Sunset on L’Enfant Promenade. (Brian Moulton/Flickr)

After nearly a week’s worth of above-average warmth, temperatures tumbled back to reality today. It wasn’t all that bad, though, given the lack of any measurable wind and lots of sunshine. And today’s more seasonable temps will not seem that bad once we get into the wintry mess that awaits us Sunday night onward.

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Through tonight: High pressure settles over the region tonight, which will result in some pretty cold temperatures. Skies will be clear, and winds will be nearly nonexistent, setting up a nice environment for radiational cooling. How low will temperatures go? Downtown D.C. should bottom out around 20 degrees, while surrounding suburbs will easily fall into the teens.

View the current weather at The Washington Post.

Tomorrow (Sunday): Sunday will start out clear and cold, as temperatures will not breach the freezing mark until the afternoon. By then, we should be under mostly cloudy skies, limiting just how much daytime temperatures will rise. Highs will range from the mid to upper 30s, with a light southeast wind developing. Things will get interesting Sunday night as precipitation builds in from the west after 10 p.m. We are expecting a mixed bag of light precipitation overnight, with lows hovering around the 32-degree mark.

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Mount Washington: Things got a little windy at the summit of Mount Washington in New Hampshire this morning. Strong winds are not abnormal at the highest mountaintop in the Northeast, where a record wind speed of 231 mph was once recorded back in 1934.

But even for a notoriously windy place, this morning’s 148 mph gust is quite impressive. According to the legendary Mount Washington weather observatory, this morning’s gust was the strongest recorded in more than a decade. The high winds were the result of a tight pressure gradient created by a strong low pressure system over Newfoundland and a building high-pressure system over the eastern United States.

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