,
8 tweets,
3 min read
Read on Twitter
A thread on Tuesday's winter weather event in DC area. First, be aware that some sneaky light snow/sleet could fall during AM COMMUTE - not just during afternoon/evening. A coating and some slick spots possible can't be ruled out, esp N of Beltway. Check conditions in AM. (1/x) 
Steadier precip should move mid-to-late morning - probably rain around the Beltway, but could be snow/mix in colder areas. Temps rise above freezing. (2/x)
Rain should start changing over snow from NW to SE across region in the early to mid-afternoon... temps still mostly above freezing. (3/x)
By the afternoon and evening commute, most spots should have snow with temps closing in on freezing. Road temps should initially be above freezing so NOT expecting things to get icy immediately...but some slush possible when snow comes down hard. (4/x)
Roads are most likely to get ICY as the snow is exiting toward the tail end of rush hour or a little later...when temps fall near to below freezing everywhere (5/x)
AFTER the snow ends, temperatures will really start to tank and wet/slushy untreated areas are likely to ice over. This animation suggests we go from wet/slushy to icy around 7 to 10p from west to east. (6/x)
We do not think this will be like Commutageddon in Jan 2011 when we had 5-10" during PM commute or like the encore in Jan 2016 when roads temps were in 20s, hadn't been treated, and everything turned to ice. But do stay flexible w/ plans, telecommute or consider metro Tues. (7/x)
This forecast is still subject to change so keep following our coverage for updates. We lay out all of our latest thinking and more at this link: wapo.st/2RTGCsj (8/8)
