Subzero Sunday: Polar Vortex Plunges Boston Into Deep Freeze

Arctic Air Grips the Hub

Bostonians are waking up to some of the most dangerous weather conditions seen this season as a displaced polar vortex sends a brutal blast of Arctic air across New England. City officials have declared a cold emergency through Monday, urging residents to stay indoors whenever possible. With temperatures plummeting into the single digits and wind chills reaching life-threatening levels, today is a day for extreme caution and maximum layering for anyone who must venture outside.

Morning: A Dangerous Start

The coldest part of the day arrives early this Sunday morning. While the sky remains mostly clear, the actual air temperature is hovering around 4°F. However, the real story is the wind chill. Driven by a relentless northwest wind, wind chill values in the Boston area are currently ranging between -20°F and -30°F. At these levels, frostbite can occur on exposed skin in as little as 30 minutes. The National Weather Service has a Cold Weather Advisory in effect for eastern Massachusetts until 1:00 PM today, highlighting the high risk of hypothermia for those not properly protected.

Afternoon: Sunny but Frigid

As we move into the afternoon, the sun will be out in full force, but it will provide very little in the way of warmth. Expect the daytime high to reach only near 17°F. Northwest winds will continue to blow at a sustained 14 mph, with occasional gusts reaching as high as 30 mph. Even during the peak of the afternoon, wind chill values will likely remain around -14°F. For the thousands of fans preparing to head out and watch the Patriots in the Super Bowl this evening, the message from meteorologists is clear: dress in several layers, cover all extremities, and limit time spent in outdoor lines or celebrations.

Evening and Overnight: The Chill Continues

As the sun sets around 5:07 PM, temperatures will once again drop quickly. Skies will remain mostly clear through the evening, with the overnight low expected to settle near 4°F. Winds will taper off slightly to between 8 and 11 mph, but gusts of up to 25 mph are still possible, keeping the wind chill well below zero throughout the night. Here is a quick breakdown of today's predicted conditions:

• Morning: Clear skies, temperatures near 4°F, wind chills -20°F to -30°F.
• Afternoon: Mostly sunny, high of 17°F, wind gusts up to 30 mph.
• Evening: Mostly clear and frigid, temperatures returning to the single digits.
• Alerts: Cold Weather Advisory remains active until 1:00 PM; Cold Emergency declared by the city.

Safety Precautions and Warnings

Public health officials are reminding residents to check on elderly neighbors and ensure pets are kept indoors. If you must travel, ensure your vehicle is equipped with a winter emergency kit, as subzero temperatures can cause mechanical issues and battery failures. The city has opened warming centers for those in need, and residents are encouraged to call 3-1-1 for assistance or to report concerns about individuals exposed to the elements. Looking ahead, the extreme cold will linger into Monday morning before a slight warming trend begins on Tuesday.