Windsat validation / intercomparison example in Alaska

Comparison of Windsat ocean surface vectors with GFS, NAM, and in situ observations for Chukchi Sea, AK on October 27, 2011.

John Lingass (WCM in Fairbanks asked us to post this for him) The GFS and NAM output for this time frame of WindSat observation look very close to the WindSat observations, especially for the higher wind speeds. Although ship observations were not available, which would be the ultimate data for validation, the surface observations at Gambell (PAGM) and Savoonga (PASA) on St. Lawrence Island have some utility for comparison as the wind flow is coming from an unobstructed direction with regard to the wind instruments at these locations. The WindSat Data shows very good agreement with these land observations in this case. As for synoptic features, a 991 mb low was stationary and slowly weakening near the Bering Strait, the wind circulation excellently indicated by the WindSat data.

Ocean Surface Winds Around Katia

Ocean surface wind vectors from Windsat around 1100 UTC on September 4, 2011.

You don’t need a picture to see that Katia is lurking out in the Atlantic. The dcean surface wind vectors derived from Windsat on the Coriolis satellite show the counterclockwise winds on the east side of the hurricane. The wind vectors are derived from the Naval Research Lab in Monterey using an enhanced retrieval method and made available to SPoRT for dissemination in AWIPS.