Scrolling around trying to find the worst ob. Philly's 95 with 6 mile viz is a candidate. Grand Rapids, MI with an 88 and 3/4 mile viz is another. HGR is entering the game with 91 and 4 miles.
Good news is that the HRRR is being less aggressive on the smoke over the past several runs. Bad news is that it is undershooting the visibility reduction in the Great Lakes right now. Much of WI and MI have 1 mile or less visibility.
To be clear, IAD has never recorded an 80+ low for any day. The morning low was 81. The question is whether it falls below 80 by the end of the day. It did drop down to 79 last evening when the winds went calm, and then rose again before midnight.
DCA is taking advantage of the west wind. Up to 93. Milky sky, but not a ton of irradiance reduction today.
90.5 at home. Likely a late high day as the warm pocket aloft is still advecting in.