Occluded low in the Gulf of Alaska

May 28th, 2020 |

GOES-17 Mid-level Water Vapor (6.9 µm), Air Mass RGB images (with and without an overlay of PV1.5 Pressure) [click to play animation | MP4]

GOES-17 Mid-level Water Vapor (6.9 µm) and Air Mass RGB images (with and without an overlay of PV1.5 Pressure) [click to play animation | MP4]

GOES-17 (GOES-West) Mid-level Water Vapor (6.9 µm) images revealed ribbons of dry air wrapping around and within the circulation of an occluded Gale Force low (surface analyses) in the Gulf of Alaska on 28 May 2020. In the corresponding Air Mass RGB images, these ribbons of dry air exhibited darker shades of red — caused by higher ozone concentrations aloft due to the dynamic tropopause (represented by the pressure of the PV1.5 surface) descending to the 400-500 hPa pressure level.

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