You're actually in a very good position for storms that run a bit inland. While DCA will be 40 and rain, you'll still stand a fighting chance of a mix or some frozen.
BOS observer near the water is slant sticking. Can we have this person train the DCA observer since they apparently know how to measure properly near water?
Let the peasants in the low lands have their rain. Indeed, us lords and ladies in the hills reap the mighty snows each dull winter day, whilst they wail and gnash their teeth in the fields.