Thursday, August 22, 2024

Upper Level Cold Low Beginning To Depart, To Be Replaced By Weaker, Warmer One

Wednesday was as gloomy a Vermont summer day as you can get, as expected.

That pesky upper level low we've been talking about was right over us, ensuring the raw, wet weather continued all day.

You can see in the radar loop I've posted. 

Hard to see but focus on about St Albans in northwestern Vermont. You see all those numerous showers rotating around that point. 

Rainfall was pretty heavy in some spots, with waves of showers peaking during the early morning Wednesday, mid to late afternoon and again after midnight last night. 

It looks like Burlington got about two-thirds of an inch of rain out of this system, in addition to the three quarters of an inch that fell Monday.

Rainfall was really impressive here in St. Albans. My unofficial rain gauge collected 2.4 inches of rain.  The breakdown of that is the one inch of rain with the cold front Monday, then another 1.4 inches from Tuesday morning to this morning. 

Other spots reported very little rain. Montpelier had a half inch of rain with Monday's cold front, and about a tenth of an inch Tuesday and Wednesday,  It was hit and miss, as usual. 

There were a smattering of reports of ponding of water on some roads and minor flooding. A Facebook group showed a photo of water flowing across Leary Road in Jericho where it meets up with Nashville Road, for instance. 

All of Vermont rivers are far below flood stage and will cause absolutely no problems today. But they are still running pretty high for August. 

The thick clouds at night kept temperatures from crashing too much during this cool spell. Lows have been in the 50s, just a few degrees below average.

The clear skies southwest of this cold pool created record lows in the central Appalachians. There were even pockets of frost in the cold hollows of West Virginia Wednesday morning. Parkersburg, West Virginia reached 45 degrees, beat the record low for the date by six degrees.

Even though skies will be clearing over Vermont tonight, the atmosphere is warming, so it will only be kinda cool. Lows in the 48 to 55 degree range for most of us. 

Satellite view of the upper level low over northern
New England at around 6 p.m. Wednesday.  You
can also see a wisp of wildfire smoke wrapping 
around the outer edge of the system, extending
from Virginia and North Carolina to just off
the coast of Cape Cod, Massachusetts. 

The good news is this thing is now slowly on its way out. Today will be not great, but definitely better than yesterday. And Friday looks gorgeous.  

Some showers will still harass us today, but they won't be as numerous as they were on Wednesday, And we might even see some sun before the day ends. Especially in southern and western Vermont. 

It's back to summer tomorrow after our pre-autumn spell. It won't be THAT warm, but it'll be well into the 70s with quite a bit of sunshine. 

Going forward, the weekend and early next week look OK, but not perfectly sunny. We're still in a weird pattern that favors these cut off lows - pools of cool air in the upper atmosphere that are shunted away from the jet stream, so they don't move much.

It seems like another cut off low, one that will be far weaker and much warmer than the one that is currently departing, will make itself felt by Sunday night or Monday.

That just means we face another round of scattered showers during that period. Since this cut off low won't be bringing in a batch of cold Canadian air, temperatures will remain near normal for late Auset. That means highs in the 75 to 82 degree range and lows within a couple degrees of 60.


 

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