Current forecast for Mt Washington on Saturday is -60 to -90 below wind chill factors.
Forecasts like these on long holiday weekend are not a good combination. If someone is considering a hike up on the summits this weekend about the best advice is leave a name and next of kin so they can ship the body home
The NWS is bit more conservative
Here is the NWS take
...EXTREMELY DANGEROUS WIND CHILLS EXPECTED IN THE MOUNTAINS...
ANYONE CONSIDERING CLIMBING OR HIKING IN THE WHITE MOUNTAINS OF
MAINE OR NEW HAMPSHIRE THIS WEEKEND SHOULD CONSIDER CANCELLING OR
POSTPONING THEIR TRIP. EXTREMELY DANGEROUS WIND CHILL TEMPERATURES
WILL AFFECT THE REGION...ESPECIALLY ABOVE TREE LINE. THE
COMBINATION OF THE COLD AND WIND WILL CREATE LIFE-THREATENING
CONDITIONS FOR ANYONE CAUGHT OUTSIDE AND UNABLE TO REACH SAFETY.
WIND CHILL TEMPERATURES SATURDAY WILL RANGE FROM ABOUT -30 IN THE
LOWER ELEVATIONS TO ABOUT -60 IN EXPOSED AREAS NEAR THE PEAKS.
WIND CHILL VALUES SATURDAY NIGHT WILL DROP TO -40 IN THE LOWER
ELEVATIONS TO NEAR -70 NEAR THE PEAKS. WIND CHILL TEMPERATURES
WILL CLIMB ONLY TO THE -20 TO -50 BY SUNDAY EVENING.
A WIND CHILL TEMPERATURE OF -35 CAN FREEZE EXPOSED SKIN IN 10
MINUTES. WIND CHILL TEMPERATURES BELOW -50 CAN FREEZE EXPOSED SKIN
IN LESS THAN 5 MINUTES.
BE SAFE...DON`T TAKE CHANCES.