Long underwear. Flannel pajamas. Fleece blankets.
They'll be more romantic than you think this Valentine's Day.
The mercury is forecast to plunge to the deepest depths of thermometer with an intrusion of frigid arctic air that'll likely drop the temperatures below zero for the first time this winter.
The trend toward colder conditions in a month that's started more than 13 degrees warmer than normal will happen over the second-half of the week.
After another unseasonably warm day today, the next couple days will turn snowy with more seasonable temperatures - in the 30s.
A northwest flow of air will turn things colder by Thursday.
Then, an arctic airmass will deepen late Friday and Sunday, dropping temperatures into the single digits Friday night.
They won't recover much on Saturday, and will then drop even more overnight into Valentine's Day with readings below zero, forecasts show.
Forecasters reported that models show "that the frigid air will be coming from the Baffin Island/Canadian Archipelago region."
"All guidance suggests that as this airmass moves southwards...the cold air will intensify as it slowly passes over frozen Hudson Bay," according to the weather service's forecast discussion.
Here's a look at the upcoming week's weather, according to the National Weather Service:
Today: Cloudy, High 46°
Tonight: Chance of Rain or Snow, Low 31°
Tuesday: Snow likely, High 37°
Tuesday Night: Snow likely, Low 29°
Wednesday: Snow, High 31°
Wednesday Night: Snow, Low 16°
Thursday: Snow, High 18°
Thursday Night: Mostly Cloudy, Low 11°
Friday: Snow showers likely, High 21°
Friday Night: Snow showers likely, Low 3°
Saturday: Snow showers likely, High 5°
Saturday Night: Chance of snow showers, Low -3°
Valentine's Day: Chance of snow showers, High 15°