** The GOES-16 data posted on this page are preliminary, non-operational data and are undergoing testing. **A winter storm produced heavy snow across parts of the Upper Midwest on 13 March 2017, and then merged with subtropical jet stream energy to help develop an intense and rapidly-deepening storm which affected much of... Read More

** The GOES-16 data posted on this page are preliminary, non-operational data and are undergoing testing. **(Hat tip to T.J. Turnage, NWS Grand Rapids, for alerting us to this case): A variety of mesoscale wave structures were seen in NOAA GOES-16 Lower-Tropospheric Water Vapor (7.3 µm) and Middle-Tropospheric Water Vapor 6.9 µm images (above;... Read More

Turbulence over the Pacific Ocean affected at least one flight on Tuesday 27 December 2016 near 24º N, 162º E, as indicated by a pilot report issued at 1745 UTC:PGUA UUA /OV 24N 162E/TM 1745/FL340/TP B777/TB MOD-SEV/RM ZOAIn the animation above of the three Himawari-8 Water Vapor bands (sensing radiation... Read More

Himawari-8 Water Vapor (6.2 µm) images (above; also available as MP4 and McIDAS-V animations) revealed the presence of a subtle packet of upper-tropospheric gravity waves propagating southeastward near the International Date Line (180º longitude over the central Pacific Ocean), just to the west/southwest of Midway Atoll on 14 December 2016 —... Read More