|Dew Point:||34.8°F (1.6°C)|
|Sea Level Pressure:||29.76" (1007.7 mb)|
Lo 34 °F
Lo 32 °F
Lo 22 °F
Lo 21 °F
Lo 25 °F
Patchy fog. Otherwise, mostly cloudy, with a low around 34. Northwest wind 10 to 13 mph.
Patchy fog before 7am. Otherwise, mostly cloudy, then gradually becoming sunny, with a high near 47. Northwest wind 6 to 11 mph becoming light west in the afternoon.
Increasing clouds, with a low around 32. South wind 3 to 7 mph.
Partly sunny, with a high near 40. West wind 6 to 16 mph, with gusts as high as 24 mph.
Mostly clear, with a low around 22. West wind 14 to 17 mph, with gusts as high as 22 mph.
Sunny, with a high near 32.
Mostly clear, with a low around 21.
Mostly sunny, with a high near 33.
Partly cloudy, with a low around 25.
Tue Dec 6 2016
SYNOPSIS... Coastal low pressure will move away from the region tonight before high pressure briefly returns Wednesday. A potent cold front will pass through Thursday. Arctic high pressure builds overhead Friday into the weekend.
NEAR TERM /THROUGH WEDNESDAY/... Precip is ending sooner than advertised by models. While there could be some patchy light drizzle overnight, temps have risen above freezing everywhere and both 00Z RAOBs from IAD and PIT show that you have to go above 10 kft to see any sub-freezing air. Main concern is for fog development overnight, but current obs show vsbys still good in many places much better than suggested by guidance. Have cancelled all warnings and advisories.
SHORT TERM /WEDNESDAY NIGHT THROUGH THURSDAY NIGHT/... Higher pressure will move into the Mid-Atlantic Wednesday and mostly sunny conditions are expected. Temps will climb into the 40s n/w of the metros and 50s elsewhere.
A strong jet stream will be located over the Mid-Atlantic Wed night into Thursday. A disturbance in the SW flow aloft will result in clouds and showers Thursday morning. Rain or snow showers are expected with the activity which will mostly stay south of DC and near the Tidewater region of VA. Although sfc temps will be well above freezing the warm layer may be shallow enough for snow showers. It will likely be light and no accumulation is expected.
Mild weather will leave the Mid-Atlantic for awhile Thursday night as an arctic front moves into the region. Temps will drop into the 20s across the region Thursday night. Wind chill values will also drop into the teens/20s.
LONG TERM /FRIDAY THROUGH TUESDAY/... High pressure is expected to build in from the west Friday through Saturday. This high will reinforce chilly air. An upslope flow could generate snow showers in the Potomac Highlands.
The high will move to the East Coast Saturday night, before moving offshore Sunday. Temperatures will remain chilly despite a return flow evolving Sunday.
A storm system should move northeast across the Great Lakes toward southeastern Canada Sunday night. A trailing cold front will move across the region Sunday night, bringing a chance of rain or snow showers. The 12z GFS model indicates that the frontal movement to the east will be persistent and move to the East Coast waters sometime on Monday. The 00z European model has a slightly different outcome in which it pushes the front eastward a little slower and stalls the front. Another storm system could develop along this stalled front over the Tennessee Valley Monday. Here is where the discrepancies lie.
Throughout the day Tuesday, the newly-formed storm system and associated cold front should move across and east of the region. Strong high pressure should build in behind the front, bringing very chilly air into the region once again.