Pier 45 Fire in San Francisco
![GOES-17 Shortwave Infrared (3.9 µm, top left), GOES-16 Shortwave Infrared (3.9 µm, top right), GOES-17 Near-Infrared "Snow/Ice" (1.61 µm, bottom left) and GOES-17 Near-Infrared "Cloud Particle Size" (2.24 µm, bottom right) [click to enlarge]](https://cimss.ssec.wisc.edu/satellite-blog/images/2020/05/200523_goes17_goes16_shortwaveInfrared_nearInfrared_SFO_fire_anim.gif)
GOES-17 Shortwave Infrared (3.9 µm, top left), GOES-16 Shortwave Infrared (3.9 µm, top right), GOES-17 Near-Infrared “Snow/Ice” (1.61 µm, bottom left) and GOES-17 Near-Infrared “Cloud Particle Size” (2.24 µm, bottom right) [click to enlarge]
Note that a faint thermal signature of the fire (pixels exhibiting dim shades of white) was also apparent in GOES-17 Near-Infrared “Snow/Ice” (1.61 µm) and GOES-17 Near-Infrared “Cloud Particle Size” (2.24 µm) images. This is because those two ABI spectral bands are located close to the peak emitted radiance of very hot features such as volcanic eruptions or large fires (below).
Just after sunrise, the northward meandering of smoke could be seen in GOES-17 “Red” Visible (0.64 µm) images (below).
However, a larger-scale view of GOES-17 True Color Red-Green-Blue (RGB) images created using Geo2Grid (below) revealed that filaments of higher-altitude smoke were drifting southward, while the aforementioned low-latitude smoke was drifting more slowly northward.![GOES-17 True Color RGB images [click to play animation | MP4]](https://cimss.ssec.wisc.edu/satellite-blog/images/2020/05/GOES-17_ABI_RadC_true_color_2020144_133117Z.png)
GOES-17 True Color RGB images [click to play animation | MP4]