From a Special Weather Statement by NOAA earlier this evening:
An arctic front will move offshore early this evening. Behind this front, temperatures will rapidly fall. This will result in brief gusty winds approaching 50 mph...which could cause some tree damage and isolated power outages. High profile vehicles are likely to be impacted as well. Gusty winds will diminish later this evening. In addition...the rapid drop in temperature will also produce a flash freeze. Untreated...wet surfaces will ice over...making travel hazardous tonight into Monday morning. Motorists should be aware for rapidly deteriorating travel conditions late this afternoon into tonight. Black ice is difficult to see. A road surface that appears wet may in fact be very icy.