Northern hemisphere weather map. The annual arctic sea ice extent decreased over the period 19792012 by between 35 and 41 per decade. Operational weekly snow cover graphics. Home monitoring and data us. Wind is caused by air flowing from high pressure to low pressure.
Since 1966 the national oceanic and atmospheric administration noaa has produced weekly snow extent maps for northern hemisphere land surfaces using visible band satellite imagery robinson and frei 2000 rutgers 2017. For other planets in the solar system north is defined as being in the same celestial hemisphere relative to the invariable plane of the solar system as earths north pole. Bureau home tropical cyclones previous cyclones southern hemisphere tropical cyclone data portal. To the left in the southern hemisphere so that the wind flows mostly around the high and low.
The northern hemisphere is the half of earth that is north of the equator. Since the earth is rotating however the air does not flow directly from high to low pressure but it is deflected to the right in the northern hemisphere. During the past four decades satellite remote sensing has provided valuable information on hemispheric scale snow extent. Climate data snow cover northern hemisphere snow cover.
All weekly snow cover products produced after may 31 1999 are to be considered experimental. Home monitoring and data oceanic atmospheric data northern hemisphere teleconnection patterns tropical northern hemisphere tnh. Blue cold front lines bring rain and wind in the direction the triangular marks point. With warnings about the fukushima disaster getting more dire every day many are wondering how they can avoid the inevitable radioactive fallout should things worsen in japan.
The extent has decreased in every season and is most rapid in summer and autumn.