Sitting and Spinning

If you look at the radar image in the last post (which is automatically updated because it links directly to the source), you can see that the area of precipitation has moved very little.  As the storm off the coast strengthens (meteorologists also say "deepens" because the pressure is decreasing) it is actually retrograding slightly. 

This means that the low is moving against the prevailing flow and is either stationary or even moving slightly south and west.

This has kept bands of precipitation from just south of DC northward for the past few hours and looks like it will continue into the mid-afternoon.

9 inches or so here in south Arlington although measuring has become a guessing game due to the wind.