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Product Description

Storm Relative Mean Velocity is a product derived from base velocity where the average 'storm' motion is taken into account. A radar operator can evaluate an average storm motion for a given scan or series of scans which can in turn can be combined with the velocity evaluated in the base velocity product. This is evaluated on a gate-by-gate basis (a gate essentially being a radial pixel, or single point of data) where the component of the storm velocity that is parallel to the azimuth of the gate is added to the base velocity resulting in either an increase or decrease of velocity evaluated at that point. This is helpful (but not essential) in quickly identifying storm scale rotation in convective weather. Storm rotation is evaluated by identifying adjacent or nearly adjacent gates with significant discrepencies in velocity. That is to say if two adjacent gates show 30kts inbound and 30kts outbound respectively, there is a change in velocity (often noted: Delta-V, DelV or ΔV) of 60kts across these two gates and is indicative of rotation. It is important to remember that the ΔV is what matters. Both in Base Velocity and Storm Relative Velocity, any region of ΔV will be evaluated the same. However, by accounting for storm motion the visual representation of the radar data can make the identification of these areas easier for the human eye to see.

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For further information, check the following twitter accounts for periodic updates on product generation status and website improvements; @CoDWXData and @CODMeteorology. Your feedback is always appreciated, so feel free to respond to tweets or send us an email using our Feedback page.

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Type	Counties Affected	Tornado Status	Hail Size	Wind Speed	Available Radar(s)	Issued by	Issuance Time	Expire Time

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