Low clouds quickly expanded across the central high plains during the overnight hours of 25-26 March 2020 as low-level easterly upslope flow associated with a surface lee trough drove moisture into the region (Fig. 1). GOES-East Nighttime Microphysics RGB imagery highlighted the westward expansion of low clouds (cyan) through the evening, along with the evolution of other cloud layers such as high cirrus clouds (red or black), and mid level clouds (green and dark yellow). This RGB was modified slightly to account for the colder airmass (reduce warm end of the blue IR component).
The animation transitions to the Day Cloud Phase Distinction RGB after sunrise to allow for continued cloud classification. The transition procedure can be found on the STOR VLAB page. The clouds still appear as cyan, with high level cirrus clouds shades of yellow and red, surface snow is green, and bare ground dark blue. This RGB was also modified slightly to account for the colder airmass (reduce warm end of red IR component) and low light conditions (reduce high end of VIS and NIR components). The low clouds progressively erode during the morning, and completely dissipate by early afternoon.
Bill Line, NESDIS and CIRA
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