GTG Forecast Derived From Ruc-20

The horizontal domain for the GTG forecast is a 301x225-point grid matching that used for the RUC-20 model. The vertical levels of the forecast range from 10000 ft to 45000 feet, in increments of 1000 ft. The images accessible from this web page are composite images for particular elevation ranges and forecast times. Given a particular range of elevations, the composite, or projection, is obtained at each grid point by taking the maximum value at the grid point over the given elevation range.

GTG Forecast Composites For Specific Forecast Times and Elevation Ranges


GTG Forecast Composites Assimilated 18:00 UTC, 19 Dec 2005
ElevationsAssimilation Hour1 Hour Update2 Hour Update3 Hour Forecast6 Hour Forecast9 Hour Forecast12 Hour Forecast
10000 - 15000 ft 18:00 UTC
19 Dec 2005		 not available not available 21:00 UTC
19 Dec 2005		 00:00 UTC
20 Dec 2005		 03:00 UTC
20 Dec 2005		 06:00 UTC
20 Dec 2005
15000 - 20000 ft 18:00 UTC
19 Dec 2005		 not available not available 21:00 UTC
19 Dec 2005		 00:00 UTC
20 Dec 2005		 03:00 UTC
20 Dec 2005		 06:00 UTC
20 Dec 2005
20000 - 25000 ft 18:00 UTC
19 Dec 2005		 not available not available 21:00 UTC
19 Dec 2005		 00:00 UTC
20 Dec 2005		 03:00 UTC
20 Dec 2005		 06:00 UTC
20 Dec 2005
25000 - 30000 ft 18:00 UTC
19 Dec 2005		 not available not available 21:00 UTC
19 Dec 2005		 00:00 UTC
20 Dec 2005		 03:00 UTC
20 Dec 2005		 06:00 UTC
20 Dec 2005
30000 - 35000 ft 18:00 UTC
19 Dec 2005		 not available not available 21:00 UTC
19 Dec 2005		 00:00 UTC
20 Dec 2005		 03:00 UTC
20 Dec 2005		 06:00 UTC
20 Dec 2005
35000 - 40000 ft 18:00 UTC
19 Dec 2005		 not available not available 21:00 UTC
19 Dec 2005		 00:00 UTC
20 Dec 2005		 03:00 UTC
20 Dec 2005		 06:00 UTC
20 Dec 2005
40000 - 45000 ft 18:00 UTC
19 Dec 2005		 not available not available 21:00 UTC
19 Dec 2005		 00:00 UTC
20 Dec 2005		 03:00 UTC
20 Dec 2005		 06:00 UTC
20 Dec 2005
10000 - 45000 ft 18:00 UTC
19 Dec 2005		 not available not available 21:00 UTC
19 Dec 2005		 00:00 UTC
20 Dec 2005		 03:00 UTC
20 Dec 2005		 06:00 UTC
20 Dec 2005
All Above Elevations 18:00 UTC
19 Dec 2005		 not available not available 21:00 UTC
19 Dec 2005		 00:00 UTC
20 Dec 2005		 03:00 UTC
20 Dec 2005		 06:00 UTC
20 Dec 2005

All Available Forecast Hours, 10000 - 45000 ft

GTG Forecast Composites Assimilated 15:00 UTC, 19 Dec 2005
ElevationsAssimilation Hour1 Hour Update2 Hour Update3 Hour Forecast6 Hour Forecast9 Hour Forecast12 Hour Forecast
10000 - 15000 ft 15:00 UTC
19 Dec 2005		 not available not available 18:00 UTC
19 Dec 2005		 21:00 UTC
19 Dec 2005		 00:00 UTC
20 Dec 2005		 03:00 UTC
20 Dec 2005
15000 - 20000 ft 15:00 UTC
19 Dec 2005		 not available not available 18:00 UTC
19 Dec 2005		 21:00 UTC
19 Dec 2005		 00:00 UTC
20 Dec 2005		 03:00 UTC
20 Dec 2005
20000 - 25000 ft 15:00 UTC
19 Dec 2005		 not available not available 18:00 UTC
19 Dec 2005		 21:00 UTC
19 Dec 2005		 00:00 UTC
20 Dec 2005		 03:00 UTC
20 Dec 2005
25000 - 30000 ft 15:00 UTC
19 Dec 2005		 not available not available 18:00 UTC
19 Dec 2005		 21:00 UTC
19 Dec 2005		 00:00 UTC
20 Dec 2005		 03:00 UTC
20 Dec 2005
30000 - 35000 ft 15:00 UTC
19 Dec 2005		 not available not available 18:00 UTC
19 Dec 2005		 21:00 UTC
19 Dec 2005		 00:00 UTC
20 Dec 2005		 03:00 UTC
20 Dec 2005
35000 - 40000 ft 15:00 UTC
19 Dec 2005		 not available not available 18:00 UTC
19 Dec 2005		 21:00 UTC
19 Dec 2005		 00:00 UTC
20 Dec 2005		 03:00 UTC
20 Dec 2005
40000 - 45000 ft 15:00 UTC
19 Dec 2005		 not available not available 18:00 UTC
19 Dec 2005		 21:00 UTC
19 Dec 2005		 00:00 UTC
20 Dec 2005		 03:00 UTC
20 Dec 2005
10000 - 45000 ft 15:00 UTC
19 Dec 2005		 not available not available 18:00 UTC
19 Dec 2005		 21:00 UTC
19 Dec 2005		 00:00 UTC
20 Dec 2005		 03:00 UTC
20 Dec 2005
All Above Elevations 15:00 UTC
19 Dec 2005		 not available not available 18:00 UTC
19 Dec 2005		 21:00 UTC
19 Dec 2005		 00:00 UTC
20 Dec 2005		 03:00 UTC
20 Dec 2005

All Available Forecast Hours, 10000 - 45000 ft


Note that when available (which is usually for only 0 hour forecasts), pilot reports and accelerometer data ocurring within ninety minutes of generation time of the RUC-2 data have been overlayed on the forecast image. The null-valued accelerometer data are represented by the 'o' symbol, and the legend for the pirep symbols is displayed below.

legend for pireps
legend for pireps