|Dew Point:||°F (°C)|
|Sea Level Pressure:|
Hi 36 °F
Hi 24 °F
Hi 27 °F
Hi 35 °F
Hi 43 °F
Mostly cloudy, then gradually becoming sunny, with a high near 36. Breezy, with a west wind 14 to 20 mph, with gusts as high as 26 mph.
Mostly clear, with a low around 16. Blustery, with a northwest wind 21 to 23 mph, with gusts as high as 28 mph.
Sunny, with a high near 24. Wind chill values as low as zero. Blustery, with a northwest wind 16 to 21 mph.
Mostly clear, with a low around 16. Northwest wind 13 to 16 mph.
Sunny, with a high near 27. West wind 8 to 13 mph.
Mostly cloudy, with a low around 20.
Mostly cloudy, with a high near 35.
A chance of rain and snow. Cloudy, with a low around 31. Chance of precipitation is 50%.
A chance of showers. Mostly cloudy, with a high near 43. Chance of precipitation is 50%.
Thu Dec 8 2016
SYNOPSIS... Cold front moves through the Mid-Atlantic through the day today. High pressure returns to the area Friday into the weekend. Another cold front crosses the area Monday followed by another reinforcing cold front Wednesday.
NEAR TERM /THROUGH TONIGHT/... Tricky forecast through early morning...Nearly all guidance failed to capture radiational cooling overnight...which allowed many locations to drop below freezing. Having said that, cloud cover has finally arrived and sites are beginning to slowly warm (e.g., IAD went from 29F-33F over last hour). Main question then becomes will...and more importantly where...will any precipitation be through mid-morning as potent jet max approaches the area. High-res guidance continues to show low-end possibility of light precipitation developing a few hours on either side of daybreak. With low wet-bulb zero heights and only a very shallow low level inversion, expectation is that anything that falls would either be snow/rain/drizzle. Question then becomes...what will surface temperatures be where it precipitates. While very low probability...there is a non-zero possibility of some isolated light glaze on area roads (outside of immediate DC/Balt metros) coinciding with rush hour where air/road temperatures are below freezing. Will be watching this very closely to see how things evolve over the next few hours. Overall, best chance of precipitation will be across S MD after sunrise...where plain rain showers are most likely.
Any precipitation moves east by midday...with some gusty winds up to 25 mph developing by afternoon. Highs today peak in the M/U40s...before tumbling tonight behind cold front. Westerly flow will promote the development of upslope snow showers beginning overnight.
SHORT TERM /FRIDAY THROUGH SATURDAY NIGHT/... On Friday...Mid-Atlantic will be sandwiched between Canadian high pressure building into the area from the central CONUS and trough of low pressure departing the NE CONUS...with a strong cold air advection pattern. Thus, expect a blustery and cold day...with wind gusts up to 25-30 mph and highs AOB 40F. Additionally, wind chills expected to be AOB freezing all day.
Strong low-level upslope component through a moist layer will allow snow showers to continue Friday into Saturday morning. While low-end advisory level snowfall remains possible...current forecast keeps storm total amounts between 2-3 inches for the entire event (roughly 24 hours).
High pressure continues to build overhead Friday night through Saturday night...with cold weather continuing. Lows Saturday and Sunday morning AOB 30F. Highs Saturday similar to Friday...with most places AOB 40F...though winds expected to be lighter as high pressure is overhead by afternoon.
LONG TERM /SUNDAY THROUGH WEDNESDAY/... The long term is a bit active, continuing the recent trend started at the end of November. Starting on Sunday, we have a fast zonal flow aloft. We`ll have a stationary front in the area with perhaps a little overruning precipitation, most likely north of the CWA. Any precipitation that makes it into the CWA may be wintry, at least partly, given a cold atmosphere, but a lot of uncertainty on this. Highs will be chilly, 30s north and 40s further south.
The fast zonal flow aloft buckles just slightly as a shortwave moves across the region later on Monday. At the surface, a wave of low pressure will ride across the area, but it looks like it will cross to our north. While the odds of wintry precipitation will still exist Sunday night, by Monday it appears the low pushes a warm front north of the area and most of our CWA will likely end up rain. Highs will rise into the 40s to lower 50s. After a short break Monday night into Tuesday, another disturbance is progged to move late Tuesday and Wednesday next week. By this time however, guidance gets into some significant disagreement, with varying strength of the next trough. GFS has a signficant storm, though we stay on the warm side until it passes, while EC is much weaker with little precip. Either way, we end up cold late next week, but temps middle of next week are highly uncertain.