WXOBS98 File Layout

Weather Observation Data Transfer Format, 1998 (WxObs 98)

Item Columns Type Description
1 01-03 3A Record type (W98). All records begin with this record type identifier code.
2 04-09 6N Station Number.
3 10-17 8N Observation date (YYYYMMDD).
4 18-21 4N Observation time (0000-2359).
5 22 1A Observation type (O=NFDRS, R=RAWS other than at the standard NFDRS observation time, F=Forecast, X=Other).
6 23 1N State of weather code.
7 24-26 3N Dry bulb temperature (degrees Fahrenheit or degrees Celsius based on Measurement Type code [col. 63]).
8 27-29 3N Atmospheric moisture (wet bulb temperature, relative humidity (percent), or dewpoint temperature based on Moisture Type code [col. 62]).
9 30-32 3N Wind direction azimuth measured from true north. 0 (zero) means no wind direction, 360 is north.
10 33-35 3N Average windspeed over a 10-minute period (miles or kilometers per hour based on Measurement Type code).
11 36-37 2N Measured 10-hour time lag fuel moisture.
12 38-40 3N Maximum Temperature (degrees Fahrenheit or degrees Celsius based on Measurement Type code [col. 63]).
13 41-43 3N Minimum Temperature (degrees Fahrenheit or degrees Celsius based on Measurement Type code [col. 63]).
14 44-46 3N Maximum relative humidity (percent).
15 47-49 3N Minimum relative humidity (percent).
16 50-51 2N Precipitation duration (hours).
17 52-56 5N Precipitation amount based on Measurement Type code [col. 63]. Blanks=no precipitation. U.S. measurement: inches with implied decimal nn.nnn format; trace shown as 00005. Metric measurement: measured in millimeters, no implied decimal; trace shown as 00001.
18 57 1A Wet flag (Y/N).
19 58-59 2N Herbaceous greenness factor (0-20).
20 60-61 2N Shrub greenness factor (0-20).
21 62 1N Moisture Type code (1=Wet bulb, 2=Relative Humidity, 3=Dewpoint).
22 63 1N Measurement Type code: 1=U.S.,2=Metric. Affects temperature (Fahrenheit or Celsius), wind (miles or kilometers per hour), and precipitation (decimal inches or millimeters - 1 = US (Preceiptation amount – 24 hour), 2 = Metric (Preceiptation amount – 24 hour), 3 = US (Preceiptation amount – hourly), 4 = Metric (Preceiptation amount – hourly).
23 64 1N Season code (1=Winter, 2=Spring, 3=Summer, 4=Fall).
24 65-68 4N Solar radiation (watts per square meter).