Site Location Identifier
M/A First letter indicates Manned or Automated observation. Second letter indicates if the observation was routine (A) or a special observation (P).
Day Day of the month in UTC time (Z time)
Time Time of observation in UTC (Z time)
Sky Conditions Cloud amounts and coverage
VIS Visibility in miles
Weather Coded weather
at the station
Temp Temperature in degrees Fahrenheit
DP Dew Point (a measure of moisture) in degrees Fahrenheit
Wind Wind direction and speed (dddff) where ddd = direction
in degrees relative to true north and ff = speed in knots, so 24012 would be a 12 kt
wind from the southwest (240 degrees) and 09003 would be a 3 kt wind from
the east (090 degrees).
Alt Altimeter setting, a measure of air pressure in inches of mercury
with the decimal point removed and the leading 2 or 3 dropped off
to make a pressure between 25.00" and 32.00". An Alt of 989 =
29.89" and 003 = 30.03".
RH Percent Relative Humidity
Chill Wind Chill...a measure of how cold the air feels on
Peak Peak Wind...the highest wind recorded in the hour if