The first image is WSR-88D base reflectivity radar from MAF /NWS, on April 29th, 2007 just before 2200 Z, capturing the N-S striking multi-cell complex with three embedded cells labeled T5,V2, and O7. The first photo is viewing the southern portion of Arcus Cloud complex toward cell O7. The second photo is viewing the northern portion of Arcus Cloud complex toward cell T5. Both photos were taken along Interstate 20, east of Pecos, as viewed from east looking west. Based on apparent detachment from parent Shelf Cloud this long Arcus Cloud is an outflow boundary Roll Cloud.
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