|Dew Point:||23.0°F (-5.0°C)|
|Wind:||From the SSE at 3.5 MPH Gusting to 8.0 MPH|
|Wind Chill:||43°F (6°C)|
|Sea Level Pressure:||25.82" (874.3 mb)|
Hi 49 °F
Hi 43 °F
Hi 42 °F
Hi 54 °F
Hi 38 °F
Rain, mainly after 1pm. High near 49. Southeast wind around 11 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.
Rain. Areas of fog. Low around 39. Breezy, with an east wind 11 to 16 mph increasing to 17 to 22 mph after midnight. Winds could gust as high as 44 mph. Chance of precipitation is 100%. New precipitation amounts between 1 and 2 inches possible.
Rain, mainly before 4pm. Areas of fog. High near 43. East wind 11 to 17 mph, with gusts as high as 37 mph. Chance of precipitation is 90%. New precipitation amounts between a half and three quarters of an inch possible.
A chance of rain before 7pm, then a chance of showers after 7pm. Mostly cloudy, with a low around 33. Northwest wind 11 to 17 mph, with gusts as high as 26 mph. Chance of precipitation is 40%.
Mostly sunny, with a high near 42. Breezy, with a northwest wind 18 to 23 mph, with gusts as high as 28 mph.
Mostly clear, with a low around 36.
Sunny, with a high near 54.
Partly cloudy, with a low around 34. Breezy.
Mostly sunny, with a high near 38.
Sun Jan 22 2017
SYNOPSIS... Low pressure will impact the area through Monday before moving away Tuesday. A cold front will pass through the area Wednesday into Wednesday night and an upper-level trough may build overhead for the end of the week.
NEAR TERM /THROUGH TONIGHT/... Low clouds, areas of drizzle and fog will persist this morning. A weak surface low is located near the mouth of the Chesapeake Bay and N-NE winds will keep low level moisture in place. Drizzle/fog will slowly diminish across the northern Mid-Atlantic through mid-day. A dense fog advisory is in effect for these locations until 18z today. Weak mixing should help break up dense fog by this time.
Cutoff low pressure in the southern stream of the jet will track through the Gulf Coast States later today before tracking northeast into the Tennessee Valley and Carolinas tonight. A strengthening gradient between this system and high pressure over New England will allow for an easterly flow to develop and strengthen later today. This will cause moisture to move in from the Atlantic Ocean while at the same time warm and moist air from the Gulf of Mexico will overrun the surface cooler air in place. The overrunning will allow for more clouds along with periods of rain. The best chance for rain will be this afternoon through tonight when overrunning will be deepest. Rainfall amounts should be light through this evening...since the bulk of the forcing from the low will remain to our south.
However...moderate rain is expected to develop overnight as the low-level jet strengthens in response to the approaching low. The strengthening gradient will also cause windy conditions...especially along the ridge tops and also across north-central Maryland into the Washington and Baltimore Metropolitan areas as well as southern Maryland. A Wind Advisory may be needed for portions of these areas with frequent gusts around 35 to 45 mph expected and gusts around 50 mph possible.
SHORT TERM /MONDAY THROUGH MONDAY NIGHT/... The low will slowly pass through our area Monday before tracking to the north and east Monday night. A soaking rain is expected to start Monday morning...but a dry slot will slowly move into the area and this will decrease rainfall rates from south to north later Monday morning into Monday afternoon. Gusty east to northeast winds are expected Monday morning...but winds will gradually diminish throughout the day as the low moves overhead and the gradient subsides. The strongest winds are expected through midday Monday across north-central Maryland into the Washington and Baltimore Metropolitan areas and southern Maryland...and perhaps across the Blue Ridge Mountains. A Wind Advisory may be needed for portions of these areas.
Depending on the track of the low...the dry slot may be strong enough for some breaks of sun to develop. The best chance for this will be across southern Maryland into central Virginia. Therefore...max temps will range from the 30s along the ridge tops above 3kft...to the lower and middle 40s across northern Maryland...to the middle 50s across central Virginia. Confidence in temperature forecast is low due to the uncertainty of how strong the dry slot will be.
One other note is that with the upper-level low overhead...this may cause enough dynamical cooling for rain to mix with snow across the ridge tops of the Allegheny and Potomac Highlands. Accumulating snow is possible across these areas...especially above 3kft.
As the low slowly moves away from the area Monday night...wrap around showers are likely across the area but rainfall rates will be much lighter compared to late Sunday night and Monday morning. Snow showers are possible along the ridge tops of the Allegheny and Potomac Highlands mainly above 3kft.
LONG TERM /TUESDAY THROUGH SATURDAY/... Center of sfc low expected to be moving northeastward near/off the Jersey coast by Tuesday morning...with a few lingering light scattered wraparound showers mainly from DC and to the N/NE. Upslope snow/rain showers could continue into mid-afternoon before moisture becomes too shallow for quality ice crystal formation. While rain will shift out of the area...breezy W/NW winds up to 20 kts and relatively warm conditions will remain Tuesday with drying on W/NW flow. Heights rise over the area Tuesday into Wednesday...ahead of next system. Unseasonably warm Wednesday with highs in the U50s/L60s.
Cold front crosses the region Wednesday into Thursday...and, with limited moisture east of the mountains, expect most areas to remain dry. However, persistent upslope component through a saturated layer should lead to prolonged upslope snow showers...of varying intensity...Thursday afternoon through perhaps much of the weekend...with some snow perhaps spilling east of the Allegheny Front at times.
Main impact east of the Allegheny Front will be a drop in temperatures back closer to seasonable averages Friday into the weekend.