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Storm Tropical Surge Violet/Charcoal

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

How it moves

Foul lineArrows · 15 ft45 ft · board 113.9° 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

Tropical Surge Violet/Charcoal

Discontinued
Hook potential4.5 (est.)4.5 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
Reactor Pearl Coverstock
Reactive pearl
Core
Surge
Factory finish
1500-grit Polished
Color
Violet/Charcoal
Released
2019-05-01
USBC
Approved 2019-03-12

Weights and specs

WeightRGDifferentialInt. diff
16 lb—0.016—

Surface

oil · laneCoarse grit
oil · laneCoarse and fine
oil · laneFine grit or polish
1500-grit Polished. Skims the oil and saves its energy for the dry part of the lane: longer skid, later and sharper hook. Polished and pearl balls. Surface changes over games, and a pro shop can take any ball either way with a pad.