PRES - Pressure in millibars
HGHT - Height above sea level in meters
TMPC - Temperature in degrees Celsius
DWPC - Dewpoint in degrees Celsius
RELH - Relative Humidity
DRCT - Wind direction in degrees
SKNT - Wind speed in knots
MIXR - Mixing ratio in grams/kilogram
-9999.00 is a value signifying missing data