Mesoscale Convective Vortex migrates from southern Arizona to southeast California

5-minute GOES-18 daytime True Color RGB and Nighttime Microphysics RGB images, from 0901 UTC on 16 July to 2301 UTC on 18 July [click to play MP4 animation]
This MCV was highlighted in NWS/WPC Mesoscale Precipitation Discussions on 16 July, 17 July and 18 July — since this middle-tropospheric feature was helping to force the development of new thunderstorms, further enhancing flash flooding risks in the vicinity of the MCV.
GOES-18 Shortwave Infrared images visualized using RealEarth (below) included outlines of the numerous Flash Flood Watches/Advisories/Warnings that were issued as the MCV propagated from southern Arizona to southeast California.