Could someone please explain and clarify this for me? I received this printout with FSMeteo:Level(ASL) Heading(TRUE) Speed(KTs) Temp© 3000 80 9 6000 70 26 9000 60 2612000 40 2818000 40 4224000 30 5130000 40 5434000 30 6039000 20 5845000 20 5853000 20 58TAFKAVP 281702Z 281712 07007KT P6SM SKC FM0600 08005KT P6SM BKN025 This is what my printout looks like. If those are temperatures, how are they as high as 58 and 60 degrees at those altitudes?! I thought temps decrease at higher altitudes. Thanks. (PS: For some reason, my post doesn't print out in the proper columns. The 80,70,60 column should be under (KTs), and the 9,26,26,28, column is to the right of the Temp© heading. There is nothing under the heading(TRUE) column.) Regards, Tom

There are a few minors details to be able to decode a winds aloft forecast. Altitudes: Up to 12000 ft, the levels are true altitudes. Then when you go above 18000 ft, the levels are based on pressure altitude.Temps: Temperatures above 24000 ft are always negative and thus the negative sign is not displayed. So if we take the following example:FT 12000SFO 2715-18This is a common winds aloft forecast. The reporting station is at San Fran and this would be for 12000ft. Don't forget this is true altitude. The first two digits is the wind direction with respect to true north. Also, it is in tens of degree. The next two digits is for speed in knots and the last is the temp in degrees C.So this is what the forecast would be decoded as: winds are out of 270 at 15 knots and the temp is -18 degrees CBut, there are a couple of other small details that you should be aware of to properly read the forecast:- winds over 100 knots have a different code - Check this out:FT 34000SFO 731455 How can we have a heading of 730 degrees?? Well, there isn't a heading of 730 degrees. Well there is if you make two complete 360 turns, but you end up where you started :) What this is telling you to do is to subtract 50 from the wind direction and add 100 to the wind speed. So this is what the forecast would read like;73 - 50 = 23 and 100 + 14 = 114So, the winds are out of 230 degrees and they are at 114 knots AND the temperature is -55 degrees C. Pretty cold I think. This method applies to directions coded 51 to 86.Hope this gives you a better understanding of winds aloft.

Thanks for the help, Arthur. Regards, Tom:-)