NWS Fairbanks issues a record 13 Severe Thunderstorm Warnings in a single day
![](https://cimss.ssec.wisc.edu/satellite-blog/images/2023/07/ak_ir-20230708_041020.png)
GOES-18 “Clean” Infrared Window (10.3 µm) and “Red” Visible (0.64 µm) images, with Severe Thunderstorm Warning polygons plotted in yellow [click to play animated GIF | MP4]
Recall that when viewing geostationary imagery at high latitudes, parallax must be taken into account — for example, the cold overshooting top east of Fort Yukon seen on the 0410 UTC image (above) was actually located over a point about 35 km (22 miles) to the south-southeast (below), placing it closer to Circle.
![](https://cimss.ssec.wisc.edu/satellite-blog/images/2023/07/parallax_AK_30kft.png)
GOES-18 parallax correction vector (green) and magnitude (in km, red) for a cloud-top feature at a height of 9.1 km (30,000 feet) [click to enlarge]
![](https://cimss.ssec.wisc.edu/satellite-blog/images/2023/07/ak_rgb-20230708_041020.png)
GOES-18 Day Cloud Phase Distinction RGB images, with Severe Thunderstorm Warnings plotted in yellow [click to play animated GIF | MP4]