Friday Morning Vermont Update: We're Still Getting Our Warm Spell, But Now There's Complications, Of Course!

The snow surrounding the shoveled paths to my shed
should disappear over the next few days. But will
it all come back later next week? Unfortunately,
that's possible. It's March in Vermont after all. 

Especially in March, forecasts of balmy weather in Vermont are often too good to be true. 

We're starting to see it with our upcoming warm spell. We'll still have some nice, mild days coming up. 

But trends are shortening the length of this spell of balmy weather.  And if these trends continue, some of us could end up right back where we started. 

Deep snow cover in the valleys will melt over the next few days, possibly only to be replaced at the end by a wet snowstorm. 

That's a worst-case scenario at this point, but preliminary forecasts for this coming Wednesday are changing. More on that in a bit, because we're getting ahead of ourselves.

COLD AIR DRAINAGE

Speaking of getting cheated out of warmth, that's what happened in parts of Vermont yesterday. We had a strange temperature set up. 

A few days ago, the forecasts for Thursday had highs in the low to mid 40s in the Champlain Valley. Instead, it was only in the mid and upper 20s for the most part. 

That cold, dense, shallow layer of cold air hugging the ground from an Arctic air mass in Canada had no trouble draining down the Richelieu river valley into Vermont's Champlain Valley,

At around 4 p.m., it was 24 degrees in Highgate, 27 in Burlington and Montreal was at 19 degrees. All those stations had north winds of 15 to 25 mph. But the cold, dense air was shallow. It was still above freezing atop Mount Mansfield. And the cold air at least initially couldn't get past the Green Mountains. 

While it was so cold in the Champlain Valley, St. Johnsbury, Montpelier, White River Junction and Springfield were all at either 46 or 47 degrees. It was just strange.

As forecast, rain, sleet, freezing rain and rain hit southern Vermont, but did not penetrate the cold air north. The worst of the weather was down in southern New England. For instance, I noticed Worcester, Massachusetts had at least 11 consecutive hours of freezing rain overnight. The roads must be horrible down there. 

It's the second time southern New England has had disruptive freezing rain this week. Albany, New York was mired in several hours of light freezing rain, too. 

Anyway, back to Vermont and the forecast:

TODAY. 

The mixed precipitation was moving out of southern Vermont early this morning. The north was just cold and dry, with temperatures near 20 or even a little below that.  Forecasters are insisting the cold air drainage in the Champlain Valley will end, and temperature will go back up to the low 40s by mid-afternoon. 

Those temperatures will be aided by a little sunshine north, especially near the Canadian border. More clouds will hang tough further south, keeping readings in the upper 30s.

TONIGHT/TOMORROW

An approaching warm front will set off some showers toward morning with increasing south winds, especially in the Champlain Valley. We might once again have to deal with a little more freezing rain early tomorrow, mostly in valleys east of the Green Mountains. It'll only be a little; enough to make the roads a mess but will not come close to creating issues with trees and power lines. 

But any drips and drizzles of freezing rain will quickly go over to plain rain Saturday, which will trend toward just light, scattered showers at most during the day. Highs will reach near 50 west and in the 40s east late in the day. It'll also be windy, with gusts to 40 or 45 mph in the Champlain Valley. 

I'll remind you again that the thawing and strong winds will probably cause ice breakups on Lake Champlain, so I wouldn't venture out there Saturday, or any day after that. I don't want to see anyone disappearing into the distance on an ice floe drifting away. 

A very weak cold front will come through Saturday evening with more showers. There's an ever-so-slight chance you could hear a rumble of thunder, which would be a sign of spring. 

SUNDAY/MONDAY

These will be the two nicest days of our warm up. It'll be in the 40s to near 50 Sunday. The day will start cloudy, but clear up in the afternoon. Monday should be the pick the week with highs in the 50s under sunshine. An April day in March. We'll take it!   

Between the warmth and a little bit of rain Saturday and those two days of warmth, we're still looking at ice breakups on the rivers, and the risk of ice jams, as we've been mentioning for days now.  

We're in for one hell of a mud season as temperatures will be above freezing from today through Wednesday. It might get near freezing in some areas on some nights, but that won't be enough to put a halt to the increasing mud. You need a hard freeze for that. 

Even worse, we had a cold winter, so the frost went down deep. The thawing won't easily be able to get past the frozen layer of soil beneath. Which means melt water and such on dirt roads won't be able to drain through the soil. It'll just add to the swampiness of what will inevitably become virtually impassable dirt roads. 

Yes, the frost heaves and pot holes are nasty on our paved roads and highways. That includes the road I live on. But I'm thanking my lucky stars I don't have to deal with a dirt road. Even my driveway is paved!

My condolences if you live on a dirt road. 

TUESDAY/WEDNESDAY

This is where we get into the potential changes. For the past few days, we've been assuming these two days would be warm, perhaps record warm. Including sunshine on Tuesday and showers and potential thunderstorms on Wednesday as a storm goes well to our north and drags a cold front through. 

But remember that cold high pressure to our north that made the Champlain Valley so chilly yesterday? Well, another one will set up in northern Quebec. It won't be as chilly as the current one. 

But, it's beginning to look like that chilly air in Quebec wants to squash everything south. So, Tuesday might still be mild, but not as warm as we thought it might be. I'm still not sure what temperatures will end up being on Tuesday. Be ready for anything between the upper 30s to low 60s until we can get that forecast pinned down better. 

And that storm that was supposed to go well to our north on Wednesday? It might end up going right over us. Or even to our south.  That means a cold rain or even a bunch of snow might end up falling. Or it might stay warm enough for a thawing rain. We truly don't know yet, and probably won't know until Monday or even Tuesday.    

This is a really fluid forecast.

As I said at the start of this post, it's March. It's a really unpredictable month. As Vermonters, nice weather is a lot of ask for this time of year. 

At least we'll have a few days of decent weather coming up. We'll take anything we can get.