Wind Chills in Single Digits Tomorrow

A lot of snow has melted over the past few days thanks to seasonably mild temperatures and the spring sun.  Yes, there are still mounds of ice and snow all over but one week ago at this time snow, sleet, and drizzle were just ending and a fresh 8-14" had fallen across Central and NE MA.

Temps right now are in the upper 40's and low 50's.   Any thought of a spring bloom will have to wait though.  This time tomorrow temperatures will be 20-25 cooler.
20z HRRR 2 m temps 5 PM (image Weatherbell)
 Maximum temperatures for Wednesday will be reached at midnight in some places across Southern New England because the Arctic front will not clear the coast until 7-8 AM.  By then temperatures will be dropping into the mid-20s across Central Massachusetts.
20z HRRR 2 m temps Wednesday 8 AM (image Weatherbell)
At 8 AM a *Wind Advisory* will go into effect.  There will be a threat downed trees and power lines.  This is the 7th time a wind advisory or a high wind warning has been issued in Worcester County since January 23-24 (via IEM).  Most of the weak trees have already fallen, but the constant barrage from the wind and wintry precipitation have weakened others.
Temperatures will stay in the mid 20's-low 30's through most of the afternoon.  .  At 1 PM expect wind chills around 10 around and north of the Pike.  In SE MA wind chills will be in the low 20's.
18z NAM hires 2 PM Wind Chill Temperature (Image Weatherbell)
As the sun starts to set the spring sun will lose its influence on the air mass and efficient cooling will commence.  By 8 PM all of SNE is in the single digits and some are below zero.
18z NAM hires 8 PM wind chill temperature
Low temps will get down into the single digits, but the wind will lessen as high pressure moves over the region, lessening the pressure gradient.  Here is 1 PM tomorrow vs 8 AM Thursday.  Notice how closely packed the lines are (isobars) at 1 PM, and how they spread out as the high moves east at 8 AM.  There is less spacing in the atmosphere for air to move through at 1 PM and thus a stronger potential.
WPC Surface Fronts/Precipitation Wednesday 1 PM and Thursday 8 AM
There seems to be an active storm track developing across North America.  Some precipitation is possible on Friday and then again later this weekend.  Wintry precipitation is still not off the table for the season.

-Zack Green


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