Difference between revisions of "NOAAWinds"

From VRTool wiki
Jump to: navigation, search
m (Which NOAA file (time) is active)
m (NOAA GFS winds in VR and VORG games)
Line 1: Line 1:
 
= NOAA GFS winds in VR and VORG games =
 
= NOAA GFS winds in VR and VORG games =
  
Winds in the game are from NOAA's [http://nomads.ncdc.noaa.gov/data.php#hires_weather_datasets Global Forecast System]
+
Winds used in the VR and VORG games are from NOAA's [http://nomads.ncdc.noaa.gov/data.php#hires_weather_datasets Global Forecast System]
 
   
 
   
 
NOAA GFS winds can be obtained from application: <br>
 
NOAA GFS winds can be obtained from application: <br>
 
http://nomads.ncep.noaa.gov/cgi-bin/filter_gfs.pl <br>
 
http://nomads.ncep.noaa.gov/cgi-bin/filter_gfs.pl <br>
 +
 
This is a 1 degree resolution forecast, with numerous weather variables, spaced 3 hours and up to 384h. This data is fabricated by a  
 
This is a 1 degree resolution forecast, with numerous weather variables, spaced 3 hours and up to 384h. This data is fabricated by a  
 
of weather simulation program, using laws of physics and inputs from instruments [which?]. Server responses are in grib 2 format.  
 
of weather simulation program, using laws of physics and inputs from instruments [which?]. Server responses are in grib 2 format.  

Revision as of 15:12, 25 November 2011

NOAA GFS winds in VR and VORG games

Winds used in the VR and VORG games are from NOAA's Global Forecast System

NOAA GFS winds can be obtained from application:
http://nomads.ncep.noaa.gov/cgi-bin/filter_gfs.pl

This is a 1 degree resolution forecast, with numerous weather variables, spaced 3 hours and up to 384h. This data is fabricated by a of weather simulation program, using laws of physics and inputs from instruments [which?]. Server responses are in grib 2 format. Variable "wind at 10m" is used. Winds are given by its two U and V components, in latitude/longitude directions.

VORG 11-12 winds for 06Z are extracted from folder YYYYDDMM00, forecast 06.
Time 0 comes from file gfs.t00z.pgrbf06.grib2, time 12 from gfs.t00z.pgrbf18.grib2 and so on.
Winds for 18Z are extracted from folder YYYYDDMM12. Time 0 comes from file gfs.t12z.pgrbf06.grib2, time 12 from gfs.t12z.pgrbf18.grib2. etc.

Note that a new folder is created by NOAA every 6 hours. Only two of the four daily simulations are used in the game. GFS files are added gradually to latest folder during publication. Schedule seems to be:

 forecast      pub time
00 03:30 - 04:30Z <-- used
06 09:30 - 10:30Z
12 15:30 - 16:30Z <-- used
18 21:30 - 22:30Z

This means forecast 0 is already history when publicated, and meant to be used as a interpolation point (in time). Game wind updates are at 6Z and 18Z, approx 2 hours after GFS release.