6:05 p.m. update: National ended up tying its previous record of 85 in addition to the new records at Baltimore-Washington (86) and Dulles (84).
4:15 p.m. update: Highs of at least 83 at Dulles and 84 at Baltimore-Washington have set new record highs for the date. As of this hour National sits at 84, which is one degree off its record high of 85 in 1956.
3:15 pm.: We’re still a few weeks off average highs of 70 or greater, and a long while from 80 or higher, but after all the cool weather of recently it almost felt like we were owed this one. Highs now topping out in the upper 70s to mid-80s do feel mighty fine! This is the warmest day at D.C. since October 12 of last year, when it hit 83 degrees (it hit 88 the day prior). March 18 was not far behind, with a high of 80 and some places warmer.
Through Tonight: We start off the evening with just a few clouds, but they increase heading past midnight as a cold front works toward us. In the pre-dawn period, a line of showers and storms should be moving out of the Appalachians, arriving and then moving east across the area somewhere between about 3 a.m. and 9 a.m. Temperatures still in the 60s after midnight eventually dip into the 50s as rainfall gets underway.
Tomorrow (Tuesday): [Edited at 7:45 p.m.] Showers and storms should be on the outs during the morning as the cold front passes. Rain showers may persist behind the front ‘til about noon, with event totals over .5” in some spots. Clearing is expected during the day. Official highs probably occur overnight before the front gets here. Afternoon readings ranging from near 50 to maybe the mid-50s are going to feel chilly, especially with winds around 20-25 mph and some gusts probably past 40 mph.
Severe weather: The storm system slated to impact the area late tonight into tomorrow morning has already caused numerous severe weather incidents today, and the numbers are still on their way up. As of publication, well over 100 reports have come in, including a handful of tornadoes. One apparent tornado seems to have done some damage in Kentucky. Similar severe reports are likely into the evening, and perhaps even a few crossing over to this side of the Appalachians for tomorrow morning.