One to two inches of rain has fallen from the current coastal storm, and it’s not over, by a long shot. While the heaviest and steadiest rain has come and gone, cool, showery weather continues through Friday as this “Ghost of Karen” sits and spins off the coast.
Through Tonight: On and off showers, with drizzle and fog in between. Overnight rainfall totals are probably around 0.25″ – plus or minus a tenth or two. Temps only fall a handful of degrees, with lows 50-55 (suburbs-city). Winds from the north around 10mph.
Tomorrow (Friday): We see continued intermittent showers with drizzle during breaks in the action. We should pick up another 0.25″ or so of rain. Highs range from the upper 50s to low 60s with winds from the north at 10 mph.
Rainfall so far: Through 4 p.m., 1.65 inches of rain had fallen at Reagan National Airport, 1.75″ at Dulles, and 1.99″ at BWI. The map of doppler estimated rainfall in the region (below) generally shows 1-2 inches.
How much more?: The coverage and intensity has waned some and we’re seeing more showery weather rather than persistent rains. But, still, as the storm spins offshore, showers cycling inland will produce measurable rain. Models generally indicate that through Friday evening another 0.5″ of rain is possible, plus or minus 0.25″. And we can’t rule out a bit more Friday night. I don’t expect much additional rain Saturday.
Here’s a NAM model simulation showing rainfall totals every 3 hours through Saturday night as well as surface pressure. Gray shades represent 0.01-0.1″ of rain. Greens are 0.1-0.4″ and blues are 0.4-0.9″. Notice how the area of low pressure off the coast just meanders, moving little.