We haven't seen rain-free weather like this since late July. A shift in our weather pattern is leading to a long stretch of dry and sunny weather. Actually, At Reagan National Airport (DCA), today will be the first day so far this month without at least a trace of rain, and the longest stretch of dry weather in September only lasted three consecutive days. What we call an "Omega Block" is setting up in the atmosphere as the jet stream takes the shape of the greek letter Omega. The D.C. area will be on the dry side of this new pattern, so today will mark the start of many sunny days in a row.
This shift in our weather pattern gives us high confidence in rain-free days and nothing but sunshine today through at least early next week. The last time we experienced weather like this was in late July and early August when DCA had eight dry days in a row (July 26-Aug. 2). Our region was also dealing with a bit of a drought back then, but all drought concerns were wiped away in late August. As a matter of fact, if we can make it through next Thursday without even a trace of rain at DCA, it will be the longest stretch of dry weather since February, when there were nine consecutive precipitation-free days.
At DCA, July ended 0.63 inches below average for rainfall, but August was 5.99 inches above average and September 5.12 inches above average. So far for this month, the D.C. area has experienced record cold and 0.47 inches of rain.