Shear vortices over the East Pacific Ocean
![GOES-17 Upper-level Water Vapor (6.2 µm) and Air Mass RGB images [click to play animation | <strong>MP4</strong>]](https://cimss.ssec.wisc.edu/satellite-blog/images/2020/11/epac_wv-20201124_180117.png)
GOES-17 Upper-level Water Vapor (6.2 µm) and Air Mass RGB images [click to play animation | MP4]
GOES-17 Water Vapor images with isotachs of NAM40 model maximum wind speed (below) showed that these vortices were forming within a very tight gradient in wind velocity (which existed just to the left of a southward-moving polar jet streak) — so speed shear was a mechanism playing a role.
![GOES-17 Upper-level Water Vapor (6.2 µm) images, with isotachs of NAM40 model maximum wind speed [click to enlarge]](https://cimss.ssec.wisc.edu/satellite-blog/images/2020/11/201124_goes17_waterVapor_nam40maxWindSpeed_East_Pacific_shear_vortices_anim.gif)
GOES-17 Upper-level Water Vapor (6.2 µm) images, with isotachs of NAM40 model maximum wind speed [click to enlarge]
![GOES-17 Air Mass RGB images, with and without contours of NAM40 model PV1.5 pressure [click to play animation | MP4]](https://cimss.ssec.wisc.edu/satellite-blog/images/2020/11/epac_rgb-20201124_180117.png)
GOES-17 Air Mass RGB images, with and without contours of NAM40 model PV1.5 pressure [click to play animation | MP4]