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Storm Monsoon specs
The Storm Monsoon is a solid reactive ball with the Atmos AI core. Here are its published specs, how they compare with the other current balls in our table, and what the numbers mean on the lane.
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| Coverstock | Reactor Solid |
|---|---|
| Cover type | Solid reactive |
| Core (weight block) | Atmos AI |
| Core type | Symmetric |
| RG | 2.530 |
| Differential | 0.042 |
| Mass bias / intermediate diff. | 0.200 |
| Factory finish | 2000 Grit |
| Flare potential (maker) | Medium |
| Maker's category | Hot |
| Color | Plum/Emerald |
| Release date (maker) | 05/01/26 |
| USBC approved | 6 January 2026 |
Numbers as Storm publishes them, checked 21 October 2026. Storm doesn't say which ball weight these numbers are for. Drilling changes how a ball behaves, so a pro shop's layout matters as much as these numbers.
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What the numbers mean
RG 2.530. That is lower than 20% of the 134 current reactive and urethane balls in our table, so it sits on the high side. Storm says "a high RG ball delays its revving, offering more length and angular motion down the lane."
Differential 0.042. Higher than 36% of the balls in our table. Storm says "a low differential ball tends to have a more predictable, controlled motion."
Solid reactive cover. Storm says solid covers are "particularly effective on fresh oil patterns," and bowling.com calls them best on heavier oil.
Symmetric core. Storm says symmetric balls have "RG values consistent across all axes" and a smooth, predictable roll.
USBC allows an RG from 2.447 to 2.813 inches and a differential of at most 0.060 inches (Equipment Specifications Manual, March 2026). Our ball spec table lists every current ball we track, and who makes bowling balls covers which company owns Storm.
Balls with similar numbers
Same cover type, closest RG and differential in our table:
- Hammer Deep Ocean Vibe: RG 2.510, differential 0.042
- Motiv Supra Sport: RG 2.550, differential 0.043
- Hammer Raw Hammer - Black / Grey: RG 2.537, differential 0.038
- DV8 Outsider: RG 2.499, differential 0.040
Sources: Storm product page; Storm, "Inside The Bowling Ball"; Storm, "The Coverstock"; bowling.com coverstock FAQ; USBC Approved Ball List (20 October 2026); USBC Equipment Specifications Manual.