. . ENVIRONMENT: GLOBAL WARMING AND CLIMATE CHANGE: Return of the Polar Vortex: Cold, at Times Downright Frigid for End of January; Increasing Snow Chances . . Return of the Polar Vortex: Cold, at Times Downright Frigid for End of January; Increasing Snow Chances By Wes Junker January 16, 2013 at 2:44 pm Washington Post http://www.washingtonpost.com/blogs/capital-weather-gang/wp/2014/01/16/ return-of-the-polar-vortex-cold-at-times-downright-frigid-for-end-of- january-increasing-snow-chances/ . A shorter URL for the above link: . http://tinyurl.com/lulwzxz . .The remainder or January is expected to be colder than normal, sometimes downright frigid. The pattern is very similar to the pattern during the first week of January when temperatures plunged more than 20 degrees below normal in the so-called polar vortex event. This time, the cold could stick around for a longer duration.
.Temperatures should average well below normal starting around next Tuesday, lasting at least through the end of January.
.For the period spanning January 21 (next Tuesday) through January 25 (next Saturday), similar patterns from the past known as analogs have resulted in highs not exceeding the mid-20s and lows falling into high single digits to low teens on some days (colder north and west of the District). Not every day and night will be that cold, but any warmer than normal period should be limited to a day at a time.
.From January 25 through the end of the month, models suggest it could be even colder. Analog patterns (e.g. 2007, 1961, and 2009) all had minimum temperatures in the single digits. Whether the coming cold will have any day quite that extreme is still uncertain but the pattern looks robust for sustained cold.
.Throughout this period, chances for snow are above normal. I think light snow events are more likely, but cannot rule out more significant storminess.
. Technical discussion .Why are you expecting the colder than normal weather to last through the end of the month?
. snip . . Topics Discussed in This Article: .Why are you expecting the colder than normal weather to last through the end of the month?
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