Well since my comment helped inspire this thread for those that have not heard the story start reading this report under the third picture on 7/4/11.
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In August of 2002 my thirteen-year-old son, Wes, and I endured repeated monstrous blows during a three day mega-storm.  We were hunkered down at the campsite on the southeast corner of the North/South corridor connecting the two tiers of Cirrus Lake.  As it turned out, it was a really bad choice of sites.  While exposure for "breezes" kept the bugs off, bugs became the least of our concerns.  Yikes, was that a bad spot!

It started with a violent thunderstorm in the middle of the night but then became a steady diet of 40mph winds with frequent gusts that went far higher.  As mentioned, it went on for nearly 3 days.  At times, 3-4 inch diameter trees were heard snapping all around us.  As the big blowdown of 1999 was fresh in my memory, I prepared for the worst.  I hauled my son out of the tent TWICE during a particularly bad stretch, heading directly to the windward shore & enduring stinging, wind-driven spray - both from the clouds and off the lake, in an attempt to avoid falling timber.  We would stay out there until I was satisfied the worst of the gusts had passed.

My son was far calmer about these matters than I was.  When I grabbed him a THIRD time to race to the windward shore, he just stared at me and refused to get up.  Instead, he said "Dad, can't we just sit here and finish playing cards?"  Somewhat reluctantly, I relented, and that's just what we did... played more card games.  I recall he had a cast on his wrist at the time.  I suspect he was hiding some really good cards in it that cast that he sorely wished to play.  In any case, he didn't wish to go out again.  Anyhow, we made out alright.

All during that 3 day blow I kept looking westward, hoping for a stretch of light blue sky to appear.  Across the lake on a peninsula on the southwest shore I noticed several campers holed up in what I know now to be a 5 Star campsite.  I was extremely envious of the wind protection those campers enjoyed.  Eventually, after all was said & done, I paddled by there and compared notes.  There was no contest.  Wes & I got the crap beat out of our camp and would have abandoned it, if we could have.  My trusted old canvas tent was ruined and had to be tossed afterward.  All the while, the guys just across the lake were having a gay old time and were merely "inconvenienced" because they couldn't get out to fish!

Ever since, whenever I visit that area, I grab THEIR campsite if it's available.  In fact, DentonDoc & I weathered a particularly nasty thunderstorm (60mph winds) at that very site this past July.  It was around about the same time frame as the storm Chaga is talking about.  Bad news stuff, that's for sure!  DD & I were forced to retreat to the deeper woods due to its ferocity and to avoid the sheets of water that were being blown perpendicular off of Cirrus Lake.

Quetico lakes can be tough places to be during tempests.  It's always a major relief to walk away unscathed and to breathe the fresh air of a post-storm sky.  It promotes humility and thankfulness!

Always best to evaluate your exposure to those west & northwest winds before setting up camp... no matter what the bugs or the view suggest!

Later,

Jimbo   

That pic looks almost like the storm clouds that came in when I was windbound for a day in the Narrows on the east end of Quetico Lake.

The only difference the clouds were ALL black.
I hope this topic helps educate any Newbie that hasn't seen how quick things can change up there.

All that water, narrow corridors to funnel the wind, it makes for some severe weather in a heartbeat.

here is a shot where the clouds look more threatening, more like a claw

No photoshop.  I don't know how the clouds show up in the reflection at the shoreline.