Hard to believe that climbers can be blocked on le Mont Blanc in this day and age but 3 Ukrainian climbers are stuck at the col de Brenva (4300m) by the atrocious weather (shades of Vincendon and Henry). They were attempting the summit. The rescue services have tried to reach them twice by helicopter but the strong southerly winds and low cloud have prevented any approach. The climbers are properly equipped with a tent and appropriate clothing but have run out of food.
http://www.lefigaro.fr/flash-actu/2011/01/09/97001-20110109FILWWW00169-mont-blanc-3-ukrainiens-bloques.php
http://www.ledauphine.com/haute-savoie/2011/01/09/les-alpinistes-urkrainiens-sont-toujours-bloques-a-4-300-metres-d-altitude
Col du Brenva, an cold and windy spot even during our summit in September