|Dew Point:||32.0°F (0.0°C)|
|Sea Level Pressure:||29.00" (981.9 mb)|
Mostly ClearLow: 9
Mostly SunnyHigh: 29 Low: 26
Light Rain LikelyHigh: 47 Low: 40
Light RainHigh: 44 Low: 23
Mostly SunnyHigh: 30 Low: 14
Mostly clear, with a low around 9. Northwest wind around 5 mph.
Mostly sunny, with a high near 29. Southwest wind 2 to 9 mph.
Mostly cloudy, with a low around 26. South wind 8 to 13 mph.
Rain likely after 7am. Cloudy, with a high near 47. Southwest wind 13 to 17 mph, with gusts as high as 24 mph. Chance of precipitation is 70%. New rainfall amounts less than a tenth of an inch possible.
Rain. Cloudy, with a low around 40. Southwest wind 8 to 14 mph. Chance of precipitation is 90%.
Rain. Mostly cloudy, with a high near 44. Chance of precipitation is 90%.
Rain before 7pm. Partly cloudy, with a low around 23. Chance of precipitation is 80%.
Mostly sunny, with a high near 30.
Partly cloudy, with a low around 14.
... Arctic high pressure will build over the region through Tuesday, before sliding off the Mid Atlantic coast Tuesday night. A cold front will move into the Ohio Valley on Wednesday and across our area Wednesday night and into Thursday. Another cold front will cross the area on Friday as high pressure builds back over the region the first half of the weekend.
NEAR TERM /UNTIL 6 AM TUESDAY MORNING/...
Arctic high pressure will build over the region tonight. Despite this, 24-hr model trends in temperatures show no change or in some cases temperatures a little warmer east of the mtns. Over the higher elevs, expect temperatures to rise overnight due to warm air advection aloft. 850 mb temps over the Appalachains are expect to rise from -15C to -4C by daybreak. Already have seen a +9C increase at 850 mb at IAD since 12Z today. Will be adjusting temps upward a bit east and several degs higher over the mtns. Still very cold nonetheless.
SHORT TERM /6 AM TUESDAY MORNING THROUGH WEDNESDAY NIGHT/... High pressure over head will continue to shift east on Tuesday, and off of the Mid-Atlantic coast into Tuesday night. This will bring lighter winds as return flow settles in. High temperatures on Tuesday will be in the upper 20s and mid 30s, under mostly sunny skies. Clouds will be on the increase on Tuesday night as an approaching low pressure/cold front approaches the Mid-Atlantic coast. Light wintry precipitation is possible ahead of this boundary over areas west of the Blue Ridge late Tuesday night.
As the boundary approaches on Wednesday and southerly flow advects warm air into our region, rain is expected to overspread over our CWA. High temperatures are expected to be in the 40s and low 50s. The boundary will be slowly moving across as waves of low pressure track along it. Periods of moderate to heavy rain are possible.
Overnight low temperatures will be in the 30s and 40s, with upper 20s at higher elevations. West to northwesterly flow settles in behind the front late Wednesday, with possible upslope precipitation west of the Allegheny Front.
LONG TERM /THURSDAY THROUGH MONDAY/... A wave of low pressure will be crossing our region early Thursday with rain. A period of heavy rain is possible, with potential for a bit of wintry weather towards the back side. Guidance has not quite settled on the exact track of the low, so this will influence future temperature and p-type forecasts, but odds favor rain for the metro, with a better chance of wintry weather well north and west. Dry weather should return behind the system Thursday night along with cooling temps.
Another front, this one more arctic in origin, will cross the region Friday. Guidance had previously hinted some snow squalls could accompany this front, but latest runs have backed off on this somewhat. That said, a stray snow shower east of the mountains still can't be ruled out. Behind this second front, arctic high pressure will then settle over or just south of the region for Saturday, resulting in a pretty cold start to the weekend. Sunday, a deepening trough dives southeast across the Plains into the southeast, potentially generating some sort of coastal system. GFS keeps this system south and east, but 12Z GGEM brings it much closer. 12z ECMWF stalls the system off the southeast coast. Ensemble spread is large, but upper height pattern suggests coastal storm potential Sunday into early next week.