7:00 AM | Blocking pattern keeps us unsettled right into the weekend...coastal storm to produce more rain later tonight and Friday
Paul Dorian
6-Day DC Forecast
Today
Mostly cloudy, cool, occasional showers or some drizzle at times, highs near 60 degrees
Tonight
Mostly cloudy, cool, occasional showers, lows near 50 degrees
Friday
Mainly cloudy, cool, occasional rain, maybe a thunderstorm, near 60 degrees
Friday Night
Mostly cloudy, cool, showers still likely, near 50 degrees
Saturday
Mostly cloudy, milder, a few showers during the day and more showers are likely at night, near 70 degrees
Sunday
After early clouds and a possible lingering shower it should become mostly sunny and milder, low 70’s
Monday
Mainly sunny, nice, low-to-mid 70’s
Tuesday
Partly sunny, warm, mid 70’s
Discussion
As colder air pushes towards the east coast from the Upper Midwest, a deep upper-level trough will intensify along the east coast. At the same time, deep upper-level trough will strengthen along the US west coast and strong ridging will pop up across the middle of the country producing the signature of a classic “omega” blocking pattern across the US. Air over Mexico and the Southwest US will be forced to the north into the Northern Plains and then back south again into the southeastern US and Gulf of Mexico region by the vast high pressure ridge in the central US. In the Mid-Atlantic region, where we are stuck under a deep upper-level trough, surface low pressure will form just off the coastline later today and then meander around for the next 36 hours or so. The result will be periods of rain in the area both later tonight and Friday and given the prolonged period of onshore flow, this scenario could result in some coastal flooding at the Eastern Shore. The weekend will feature slow improvement given the "omega" blocking pattern. Showers are possible on Saturday and then likely Saturday night/early Sunday as a cold front crosses the region. The sun should break out Sunday afternoon and temperatures will climb to the 70 degrees mark for afternoon highs.
Meteorologist Paul Dorian
Vencore, Inc.
vencoreweather.com