Friday, March 22, 2019

Vermont Snow Really Piling Up On Hills. Deeper Valleys Not So Much -- Yet

Not as much snow in many Vermont valleys as feared this morning,
but the snow is on the way. Updated National Weather Service
forecast map still shows more than six inches coming in the
yellow and orange areas, three to five inches, generally in
the blue. Snow accumulations still look really dependent on elevations
1 p.m. FRIDAY STORM UPDATE

So far today, the snowstorm is behaving largely as expected, although there are some picky details that are altering things a bit.

As expected, the lowest elevations are getting a rain/snow mix. Web cams in the Champlain Valley, for instance, show little if any accumulation.

Go up just a couple hundred feet in elevation, and it's sticking.

Run uphill another couple, or few hundred feet, and the snow is sticking to the roads. Web cams out of Berlin, Vermont showed a snow covered, slippery Interstate 89 at that relatively high elevation.

The web cams also show sagging trees under the weight of the heavy, wet snow, so it looks like power failures will be an increasing problem as we go through the day into tonight.  We were closing in on 3,000 outages or so as of shortly before 1 p.m. in Vermont.

Those outages will spread to new areas as it gets colder later today and this evening. Rain/snow mixes in the lowlands will change to all snow, and the trees and lines will get weighted down there, as well.

The National Weather Service in South Burlington added Washington and Caledonia counties to the winter storm warning, as more snow than expected seems to be coming down in those areas. Especially in the higher elevations.

There's already some relatively impressive snow totals out there so far in the mid and high elevations. By noon, Cabot had accumulated nine inches, and Middlesex had eight inches. Lots of places had two to five inches.

PREVIOUS DISCUSSION

Storms like the one currently harassing us Vermonters have a high bust potential, as noted yesterday, and here we go with that.

The good news for most of us who have to get to work is, this Friday morning isn't nearly as bad as we thought it would be last night.

Even so, the precipitation became heavier just in time for this morning's rush hour. Which the National Weather Service in South Burlington said would happen.

So road conditions did deteriorate as we were headed to work this morning. On my trip from St. Albans to Burlington at around 8 a.m., light rain had just changed to heavy wet snow, but the road wasn't snow or slush covered - yet.

The bad news (or more good news if you're a die-hard winter freak) is most of us still have a BUNCH of snow on the way.  Yes, even in the valleys.

Overnight and early this morning, it has been snowing in the mid and high elevations, while valleys have had a cold, light rain, or a mix of light, wet snow and rain.   As of 6 a.m. roads in the Champlai Valley were good, as temperatures hovered a few degrees above freezing. Elsewhere in Vermont, it depends on where you are. Roads are good to bad, depending on elevation.

The morning will continue with the mix of rain and snow, with all snow above 1,000 feet. You'll probably notice in the valleys that it will often be more likely rain when the precipitation is lighter, and snow when it gets heavier. That's the nature of the beast.

It now looks like the most "interesting" part of this storm comes in late this afternoon and tonight. The nor'easter will strengthen as it moves, well, northeastward into the Maine coast.

When this happens, there is often added lift, or rising motion in the air to the west of the storm. Rising air encourages precipitation, and we in Vermont will be west of the storm. So precipitation will start to come down more heavily later today. 

Wet snow falling in Winooski, Vermont this morning. It was warm
enough at the time that it was not sticking to the road.

At the same time, north winds will be strengthening as the storm deepens, and that will pull down some colder air from Canada. Everybody in Vermont and northern New York will transition to snow.

The mountains still look like they will get blasted. The western slopes of the Green Mountains, the summits, the Northeast Kingdom and parts of north-central Vermont north of Route 2 will get six to 12 inches, says the National Weather Service in South Burlington.  All of those spots are still under a winter storm warning until noon Saturday.

The Adirondacks and St. Lawrence Valley of New York can also expect six to 12 inches. Some mountainous areas look like they will get as much as a foot and a half of snow, especially in the High Peaks of the Adirondacks and the ski areas and highest elevations in the northern half of Vermont.

Lower elevations, like the Champlain and Connecticut River valleys and maybe deeper river valleys like right along the Winooski River, will get three to eight inches of snow, says the NWS. Again, this will be really dependent on elevation, with amounts rapidly increasing the more uphill you go. All these areas are still under a winter weather advisory. 

Winds will really pick up by tonight, so the wet snow and the wind will weigh down trees and power lines. Expect at least some power outages across the state overnight and Saturday morning. There could be quite a few outages, if things get bad.  Gusts will reach 40 mph in many spots. Roads will be lousy overnight and Saturday morning.

Remember, wet snow on roads is even more slippery than the powdery stuff. Slush is deceptive. It's almost always is worse than it looks.

The snow will become more and more confined to the western slopes of the Green Mountains and Adirondacks during Saturday morning then finally taper off.

Some sun will appear in many areas during Saturday afternoon, but like I said yesterday, so what, it will still be wintry. Temperatures will make it into the low 30s at best in most locations, and that stiff north wind will continue.

Sunday still looks better, but that next Arctic front looks like it's moving a little faster. Clouds will creep in across the north after a sunny start Sunday, and there might be a light rain shower toward the end of the day as temperatures briefly make it into the 40s.

Monday and Tuesday still look miserably wintry, windy and cold with subfreezing highs and lows in the unseasonable single numbers and low teens. A temporary warming trend still looks to arrive during the second half of the week, and that will melt some of the new snow, at least in the valleys.


No comments:

Post a Comment