18z HRRR is insistent on //some// rain for everyone, but it really tries to run a few decent thunderstorms north of I-66 that drop localized 1" amounts.
April is just about in the books, so we turn our attention to May flowers and the prospects of thunderstorms. CPC says cool and wet may be in order first.
That event was the biggest tornado outbreak that I can remember. The only other event that even comes close in my mind was April 16-17, 2011. Both events even spun tornadoes up into our area.
Only M0.11" RSTM2 COOP site. Didn't even get under the cars wet. To further illustrate how dry things have been, the Thurmont mesonet site recorded almost 0.4" of rain today, but the four inch soil moisture probe hasn't budged.
More records fall today:
BWI: 91 (breaks old record of 90 set in 2002 and 2012)
HGR: 90 (breaks old record of 88 set in 2002)
IAD: 92 (breaks old record of 91 set in 2002)
MRB: 92 (breaks old record of 90 set in 1941, 1976, and 2002)
We don't need a flood, just a steady and soaking rain that totals about 1.5" regionwide. You could parse it out about 0.1" - 0.2" per hour over several hours.
Nearly half and inch of rain across portions of far northern Frederick County, as well as Carroll and Baltimore counties. Yet the two and four inch soil moisture values barely moved on any of the mesonet stations in this area. It really goes to show you how thirsty the vegetation is right now.