A sequence of GOES-17 (GOES-West) Low-level (7.3 µm), Mid-level (6.9 µm), Upper-level (6.2 µm) Water Vapor and “Clean” Infrared Window (10.35 µm) images (above) showed a long-lived orographic banner cloud that formed in Southern California and extended about 200 miles to the northeast across southern Nevada on 22 December 2019. The banner cloud was formed by... Read More