How Do They Draw The Blue Scrimmage Line On Tv

On Thursday-5 / 5: Air Antarctic traverses the South Atlantic ..

Preview Charter Level 850 millibars (1,500 meters), for the Friday 6-May 2011, at 03 utc (00 hours Argentina). ---
The curves presented in the Charter, are temperatures in ° C (every 2 degrees). Please note that temperatures are expected in the 1,500 meters.
This Charter is very useful to display or define the different types of air masses expected in the area. ---
The colors in shades of orange indicate the presence of Warm Air . ---
yellow zones are transitional air masses, with the presence of a Cold Front . ---
areas light blue and light blue indicate the presence of Polar Air . ---
areas in shades of blue, demonstrate the presence of Air Antarctic.
--- Note at the bottom of the map (south of the South Atlantic), the presence of Antarctic Air Core (dark blue).
--- Southern Air will be moving eastward. By this time, it will not reach the East Coast of Buenos Aires.

- - Source of the Charter: GFS Forecast Model (NOAA / USA).
--- To see the full letter, click on it with the mouse. ------------------------------------