THREAD - on winter storm headed to DC area. Snow moves in predawn and may become HEAVY at times sunrise into the morning. But, the question is WHEN sleet mixes and takes over. Mid-morning currently best estimate. (1/x)
Whether it's mostly snow or sleet in the morning, it will STICK w/ temps below 32. Sleet cuts down on snow totals but doesn't change the IMPACT of the storm. Because of mixing w/ sleet, we DECREASED snow/sleet forecast from 2-4 to 1-3" in DC and southern suburbs. (2/x) 
Areas that get less snow from this storm will get more sleet and, unfortunately, more freezing rain. SE of DC into Southern Maryland, ice could build-up to 0.25" or more causing areas of tree damage and even power outages. (3/x)
By far, we expect WORST travel conditions on Thursday in the morning to early afternoon, when snow/sleet heaviest, most accumulation is likely, and visibility will be reduced. Wintry mix poss after that be generally lighter/intermittent late Thursday afternoon into Fri AM. (4/x)
Our detailed briefing lays out all of this and will answer most of your questions. Read it here: wapo.st/3prRSIb (If there's anything we haven't addressed, feel free to ask) (5/5)
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