Not surprising that we have so many locations hitting 100 degrees. The latest SPC mesoanalysis has 850 temps of +22C and warming. Might explain the lack of a cu field.
Per NWS:
Baltimore (BWI) has tied its longest streak of days with temps of 101F+ at three (3) days -- previous occurrences 8/26-28/1948 & 7/19-21/1930
Washington DC (DCA) has tied its longest streak of days with temps of 101F+ at three (3) days -- previous occurrences 7/19-21/1930
One more degree and the Baltimore City mesonet site becomes the first site to hit 100 in the (short) history of the network.
https://www.weather.gov/wrh/timeseries?site=008MD&hours=72
Even our mesonet sites, which are on grassy & open areas, are flirting with the century mark. This isn't a few poorly placed temp sensors. It's legit heat.
We've blown by the convective temp of 93 degrees per the 12z IAD balloon. Yet the cumulus field is just now struggling to bubble up. There has to be a cap or something.
There appears to be a lack of a kicker, save a mesoscale boundary, and a mid level temperature inversion for today. The upside is that tomorrow's potential probably kicks up a notch if the instability isn't turned over today.