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In a Storm Relative Velocity Map (SRM), storm motion is zeroed out so that meteorologists can get a sense of how precipitation is moving with winds inside a storm. A movement toward the radar would be inbound winds, with outbound winds headed away from the radar. Rotation is represented by adjacent (gate-to-gate) inbound and outbound winds. The concern for tornadoes increases when there is strong rotation in a deep layer (10,000 feet or more) for a prolonged period (15 to 30 minutes or more). |