Browse Tag


Third cold front in three days brings a chance for snow

Granted, it won’t be a lot of snow… mostly just a quick shower for the MD/DC region along a cold front that will push through the region tonight. To the north and west, the snow is expected to be a bit more robust as a quick thump of snow along a squall line of sorts (which could be thundersnow in PA as the lapse rates allow for conditional instability) could lead to accumulations of around one inch in the upslope areas of western/central PA down through the MD panhandle into east-central WV.

The strength of the snow squall varies on the models… here is a look at one of the more potent outcomes via the HRRR composite reflectivity around mid-evening:

And this is how it looks a couple hours later as it approaches the DC region… note that it has weakened a fair amount by this point:

East of the mountains could see a quick dusting to an inch of snow from this line of snow as it pushes through the region. This is much more likely in the northern Mid-Atlantic (PA down through around DC) than it will be in the southern areas as the upper-level energy driving this snow squall slides eastward across PA:

You don’t get a snow squall along a cold front in the Mid-Atlantic that often as temperatures are typically too warm ahead of the cold front, but this time the low-level temperatures should be cool enough to allow for snow, especially the further north you go.

A dry cold front is pushing through the region

Winds are starting to gust again today as another cold front makes its way through the region. A lack of moisture out ahead of the front means nothing but an isolated shower or two is possible along the front as is slides eastward.

Despite being a cold front, it won’t do much to bring in cooler air as temperatures drop into the upper 20s to lower 30s in the DC region tonight, with highs in the upper 40s to lower 50s tomorrow afternoon.

Coldest morning of the season in the Northeast

A lot of locales in the Northeast are experiencing their first sub-zero lows of the winter, with temperatures as cold as -24F in Watertown, NY! (Yes, it’s -24, not -23. The software rounds the Celsius conversions oddly in some cases)

A 1030mb high centered over southeastern Ontario is allowing for light to calm winds under mostly clear skies.

UPDATE: Grabbed the hour with the coldest temperatures and updated the map.

SNOW possible in the higher elevations this weekend

A shot of cool air is expected this weekend up and down the eastern U.S., with lows in the 30s possible in the higher elevations and maybe even northern MD. DC looks like it will stay in the low to mid 40s at its coldest point on Sunday morning (and possibly Monday morning).

The 12z GFS is pretty aggressive with the cold, showing widespread 30s and even some 20s in the region Monday morning (similar to Sunday morning, only the 30s reach further east Monday morning as high pressure moves overhead):

On top of the cooler temperatures, some snow showers could develop Saturday morning in the higher elevations, with a flurry or two possible Sunday morning up in the mountains. Some minor accumulation is possible in the highest areas, otherwise the snow that does fall should not accumulate. I wouldn’t rule out seeing a flake or two in the air in northern VA/MD, but it looks unlikely at this point.