WXOBS13 File Layout

Weather Observation Data Transfer Format, 2013 (WxObs 13)

Item Columns Type Description
1 01-03 3A Record type (W13). 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=Published NFDRS, R=RAWS, F=Forecast, X=Other). If type is R and observation time is the station’s standard NFDRS observation time(RS) and the State of weather code is not blank, State of weather code and Wet Flag for this observation were estimated by the WIMS RAWS Gateway routines. (Note: NFDR processing programs should be modified to compute NFDRS indexes for the traditional “O” and the “R” at RS time if the SOW is not null.)
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).
25 69-71 3N Wind direction of peak gust during the hour, degrees. Zero means no wind direction, 360 is north.
26 72-74 3N Speed of peak gust during the hour. (miles or kilometers per hour based on Measurement Type code).
27 75 1A Snow Flag (Y/N). Signals fuels over the fire danger rating area are snow covered.