Two periods of possible plume drift inland and northward during the late evening of Wednesday April 6 and afternoon/evening of Thursday April 7 Japan Standard Time (JST).
There have been no reports of recently released airborne radiation in the vicinity of the reactor site, but the site has still not been stabilized.
The Naval Research Laboratory’s 5 km resolution skillful data-assimilating mesoscale meteorological model COAMPS produced the fields, using a passive tracer to map the expected plume trajectory. Lighter gray contours show more concentrated material. Each shade of gray represents a factor of 10 difference in tracer concentration. [Plume images are a research tool; contours are arbitrary units for visualization purposes.]