This is why you read the headlines and the AFD. The mesos were all over the place with exactly where the localized heavy rains would set up, even this morning. My local forecast had 1-2 for today, and it looks pretty spot on as of now. Further NW was more iffy based on most guidance, so probably why LWX went more generic/conservative with amounts on the point/click.
And again, WPC highlighted the risk for excessive rains for DC-BWI-PHI and points east yesterday.