Neptune,

What part of the country do you live in?
If you live in a colder climate.

In the northern part you might need to take precautions.
Like not letting them lay in direct contact with the floor.
I have seen equipment crack from this.
But if they aren't in direct contact I can't see it being an issue.

As for flooding you'll have more to worry about than just replacing bowling balls.
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2nd arrow is for pansies.

I have been keeping all the balls currrently not in rotation in my fairly humid basement since I returned to bowling in 1995. We keep the dehumidifier running to try to keep the humidity in the 55% or less range.

I keep many balls in their original plastic bag in their original box, but I always have about 20 or so sitting on an old rug directly on the cement floor, in front of one of my storage racks.

Over those 14 years, with many balls staying in there from 3 - 6 years, I have had about 150 - 200 in there over the years. Only 2 have cracked, one Track Sensor/C (no great loss, after sitting idle for 3 - 4 years) and one Columbia Ego (I really liked that ball. It was sitting idle for about 2 years.) Other than those, no cracks at all.

I still believe most (but not all) cracks come from mishandling/misdrilling by the driller. There's about 3 or 4 things they should really do very carefully. I won't go over them because we've done that time and again.

Keep in mind that some balls will crack when you pass them through lare changes in temperature AND/OR humidity. While my basement is humid, it stays around the same range for most of the year.

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"None are so blind as those who will not see."

Sounds a lot like mine, Neptune. Should be fine. However, I would wait a couple of days to let both temperature and humidty settle into a stable range, before bringing them all down. Especially, after you get a dehumidifier.
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"None are so blind as those who will not see."

I wouldn't worry about it.  I would think about building a rack or storage shelf for them, and using 2x6 for the base - will keep them off of direct connect with the floor, and should help to keep them dry if you experience flooding.

You guys have me worried with all this talk about keeping the temperature and humidity consistent.  I keep my balls stored in my detached garage - no HVAC of any kind, and not well insulated.  Last winter the temps got down to 26 (25. in there, and this summer they've gotten as high as 90 (89..  Temps measured at around 7 feet and almost in the center of the garage.

Out of the 100 balls I've owned, I've only had 5 crack on me.  1 of those was a Titan SE stored in the house (constant temp of 72-75) - but it had been plugged and redrilled.  It cracked from the thumb slug all the way around.  1 other (Orbit Extreme) was a simple crack in the bridge.  1 (V2 Sweet) cracked from the x-hole to the fingers, and them from the fingers almost around to the thumb - it was a 2nd and probably had other issues.  I had a Mutant that cracked - again it had some plug work. The last one cracked all the way around, but was a ball that I was using for testing different plugging material.  The plug was never cut down.  It sat in the corner for several years, so no idea when it actually cracked.

Most of my balls are stored in bags and boxes.  I've left a few sitting in ball cups on my work bench, but I've never left them sit directly on the concrete floor.  I guess the worse I've done is sit them on a piece of Dricore subfloor that we had left over from a kitchen remodel.  They sit on shelves with at least a 2x4 as the base and I never stack them more than 2 balls high.

Like charlest said, most problems seem to come from drilling (although my Orbit Extreme was a single drill and hadn't been touched in over 2 years when the bridge cracked).
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