300 Millibar Chart.
Approximately 30,000 feet above sea level. AGL

1. Solid lines (Contours) are lines of equal heights of the 300 mb above sea level. AGL

2. Black arrows are the jet winds. Jet winds are winds of greater than
50 mph, and may reach speeds of over 300+ mph called: "ISOTACHS".

3. Clear circle are the station locations, such as Buffalo, New York.

4. Looking at Buffalo, New York -49 in the upper left is the temperature
of -49 degrees Celsius at the 300 mb level.

5. The 919 in the upper right is the height of the 300 mb level above
sea level, in this case 9,190 meters, or 30,173 feet.

6. The wind direction at Buffalo, New York is from the southwest, and the
wind speed is 55 knots.

7. The darken circles are areas of high moisture content, above 20% relative humitidy.

8."L" is and area of "Low Pressure"colored red.