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Storm PRO Motion

Photo and specs courtesy of bowling.com. Reproduced with credit to the maker.

How it moves

Foul lineArrows · 15 ft42 ft · board 75° entry
Arcing turn (symmetric core). Dotted is skid, then the turn, then the roll into the pocket. Estimated from the coverstock, finish, core, and differential for a right-handed bowler with medium revs on a house shot. Lane conditions, speed, and layout move all of this.
Storm

PRO Motion

Discontinued
Hook potential7 (est.)7 of 10, estimated

How much the ball wants to hook, 1 (straight, a spare ball) to 10 (the strongest oil-eaters). The maker publishes no number for this ball, so this is estimated from the coverstock, core, finish, and differential.

Coverstock
SPEC Solid
Reactive solid
Core
Piston
Symmetric
Factory finish
2000 Abralon
Color
Not listed
Released
2019-07-26
USBC
Approved 2019-06-11

Weights and specs

WeightRGDifferentialInt. diff
12 lb2.650.035—
13 lb2.590.045—
14 lb2.530.051—
15 lb2.520.049—
16 lb2.510.047—

Surface

oil · laneCoarse grit
oil · laneCoarse and fine
oil · laneFine grit or polish
2000 Abralon. Sanded then smoothed (1500 to 3000 grit): enough tooth for oil, enough gloss to get down the lane. Most box finishes. Surface changes over games, and a pro shop can take any ball either way with a pad.

Balls like this

Same coverstock and core type; the closest company for this ball in a bag.