OSHA standards were usually written after a day like this!
(emphasis by me)
1910.36(h) An OUTDOOR exit route is permitted.
1910.36(h)(1) The outdoor exit route must have guardrails to protect unenclosed sides if a fall hazard exists;
1910.36(h)(2) The outdoor exit route must be covered if snow or ice is likely to accumulate along the route, unless the employer can demonstrate that any snow or ice accumulation will be removed before it presents a slipping hazard;
1910.36(h)(3) The outdoor exit route must be reasonably straight and have smooth, solid, substantially level walkways; and
1910.36(h)(4) The outdoor exit route must not have a dead-end that is longer than 20 feet (6.2 m).
And the first one who says… “Well Mr. Safety man, wouldn’t the fire melt the snow” I swear I will…