20-25km winds.
Today the gondola was operating under these wind speeds but only operating to the mid station.From there you can ski over to Yastrebets 4 man chairlift.
Hope this helps
No idea on the windspeed but out of the 6 days skiing it was shut for 3 days when I was there. Each chairlift as well is shut on certain days, sometimes just for a morning for maintanence. This causes some queuing. The 4 chairlift to the left of the Rila is on Wed I think and the 4 chairlift in front of the Rila is Either Sun or Mon, but could be wrong - memory not what it was!!
Borovets maintanence.
Markoudjik pomers-Monday morn until about 1130am (closed)
Gondola-Monday morning (closed)
Martinovi Baraki chair lift -Tuesday morning (closed)
Sitnyakovska Skala chairlift-Wednesday morning closed
Yastrebets chairlift-Thursday morning closed
Same as above they are closed all day on the last corresponding day of the month.
i.e-Gondola closed on the last monday of the month for the whole day .etc etc etc