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From ye olde National Weather Service:

...A PROLONGED PERIOD OF VERY COLD AIR TO AFFECT THE REGION BEGINNING TONIGHT... LIKELY LASTING FOR A WEEK OR MORE...

A VERY COLD ARCTIC AIR MASS WILL SURGE INTO NORTHWEST NORTH CAROLINA TONIGHT... WITH INTENSE COLD EXPECTED THROUGH THE WEEKEND. LOWS BY SATURDAY MORNING WILL FALL TO AROUND 15 DEGREES. THIS WILL BE ACCOMPANIED BY GUSTY NORTHWEST WINDS TO 20 MPH. WIND CHILL READINGS WILL DIP TO AS LOW AS 5 TO 10 DEGREES SATURDAY MORNING. THE TEMPERATURES MAY REMAIN BELOW FREEZING FOR SEVERAL DAYS WITH HIGHS ONLY IN THE UPPER 20S EXPECTED SATURDAY AND AROUND 30 SUNDAY. OVERNIGHT LOWS NEAR 10 ARE EXPECTED ON SATURDAY NIGHT. THE EXPECTED DURATION AND INTENSITY OF THIS COLD EVENT WILL BE A VERY UNUSUAL OCCURRENCE. THIS INTENSE COLD EVENT WILL BE NEARLY CONTINUOUSLY REINFORCED BY A COUPLE OF VERY STRONG ARCTIC HIGHS. THESE HIGHS WILL PUSH FROM NORTH CENTRAL CANADA SOUTHWARD THROUGH THE CENTRAL AND EASTERN UNITED STATES DURING THE NEXT WEEK. THIS COLD EVENT WILL LIKELY LAST THROUGH THE NEXT 7... TO POSSIBLY 14 DAYS. SEVERAL DAYS OF SUBFREEZING TEMPERATURES MAY OCCUR. A COMPARABLE COLD SPELL BASED ON SOME OF THE HISTORICAL COLD EPISODES FROM THE PAST INCLUDES THE LAST TWO WEEKS OF JANUARY 1977. PREPARATIONS SHOULD BE MADE NOW TO ENSURE THAT HEATING SYSTEMS ARE IN STRONG WORKING ORDER... ANY EXPOSED PIPES ARE PROPERLY INSULATED OR COVERED... AND CRAWL SPACE VENTS ARE CLOSED. CHECK ON THE ELDERLY TO ENSURE THAT THEY HAVE ADEQUATE AND SAFE HEATING. IN ADDITION... REMEMBER THE SAFETY RULES FOR SAFE HOME HEATING. ENSURE YOUR PETS HAVE A WARM PLACE TO STAY.