From the ABC 7 Weather team

Coldest air of the season rolls in, but for how long?

November 12, 2013 - 11:55 AM
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This cold swing brought much colder air into the region, but how much longer will it hang around?

The high temperature for Tuesday occurred at 6:16 a.m. with a temperature of 53°F.

This happened just ahead of the strong arctic cold front which helped drop the temperature to 41°F by noon. Temperatures in the outlying suburbs are sitting in the upper 30s and will be there through the early afternoon.

It's not only the temperatures that have changed. The winds have accelerated to 10 to 20 mph out of the northwest with some higher gusts. This will make it feel like the 30s and even upper 20s through the afternoon and evening.

Courtesy: Weatherbell.com Models

Take a look at the forecast low temperatures tonight from the 4km NAM model from WeatherBell.com. Tuesday is forecast to be the first night with temperatures below freezing at Reagan National Airport. So far, the lowest temperature at Reagan has been 34°F which happened on the Nov. 9 The average first freeze at Reagan is Nov. 18, so we're pretty close!

Last year, Reagan National didn't hit the freezing mark until the Nov. 26, and didn't dip into the 20s until Dec. 23!

In 2011, the first day at freezing was the Dec. 23 and the first day with lows in the 20s was the 11th, so it appears this year we'll be ahead. Don't worry, this doesn't have a direct correlation to how much snow we'll see this winter.

The winter of 2009-2010 (record 56.1 inches of snow) didn't observe the first day below freezing until the Dec. 6.

Another interesting thing happened Tuesday speaking of averages. The average high temperature is now 59°F (at Reagan), and average temperatures won't hit 60°F again until late March.

So what about the rest of the week?

This will be a short-lived cold swing, with high temperatures back around average come Friday into the weekend. Beyond that, temperatures are expected to swing well-above normal by early next week. Highs may be near 70 degrees (though more than likely in the 60s) by Monday ahead of another cold front.

Temperature anomalies Monday evening (Courtesy: WeatherBell.com Models)

This is the time of year many people start to get sick so be sure to take care of yourself! Keep an eye on our latest 7-Day Forecast to watch for the next temperature swing.

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