97779 23074 51250 91100 88400 99005 78//8 /6973
RMK AF300 0604A Dennis OB 11
DEW POINT NEG 51C.

Someone sent me a link and I tried to decode this manually....

97779 It says this report was made by an aircraft with radar capability.
23074 It was done on 7/7 at 23:07 UTC (7:07 PM EST) with dewpoint capability with the aircraft below 10000 m.

51250 91100 It was done on Thursday with the aircraft located at 25.0 N and 91.1 W Boy, that makes no sense... maybe they meant 71.1 W (The 91100 part can't be)? There was no turbulance and the conditions were clear.

84400 The pressure altitude of the aircraft was 884 decameters... (what a useful unit, huh?) which is... well, not the same as meters as this website implies, so I'm confused again. 884 decameters would be 8840 meters and 29k feet. The wind is spot wind, which was obtained using dopplar radar or inertial systems.

99005 Again, this makes no sense... the 99 should represent the wind direction, but you have to add a zero after it, and well, 990 is silly... and that would also mean the windspeed was 5 kts... It can't be the temperature either, as 99 C would be insane, too. So, it seems I am stuck, and the 78//8 part makes no sense either.

/6973 This indicated a pressure group. It was done at the 300 mb level in geopotential decameters (huh? I get the 300mb part, but what does geopotential decameters mean?) Sealevel pressure is 973 mb.

I didn't even make it to the dew point part, since the temp data seems messed up... Where did I go wrong?

Edited to apologize for my need to understand everything I read....

P.S. That link, http://www.hurricanehunters.com/recco.htm says a language remark can be added to state the actual dew point... So, that brings us back to a negative dew point... Again, dew point is the temp required for saturation... something that shouldn't be negative in a storm.