DESCRIPTIONS - This satellite broadcast is carried using the second set of three
virtual channels of the ISCS (i.e. PVC 4, 5 and 6) for Countries requiring WMO
data to meet their meteorological/hydrological needs.
Data to be Broadcast - The U.S. through NWS operations is
supporting the WMO/WWW dissemination of three data types by satellite
- Gridded Binary (GRIB) code data,
- Alphanumeric data (primarily synoptic and text), and
- Graphical data (analysis and significant weather.
GRIB Data -
The GRIB Data includes analysis fields and forecast fields over
the region in digital form. This data will initially include sea level
pressure, temperature, wind fields, geopotential heights, humidity, and
precipitation for WMO users. The geographical coverage is initially the
northern hemisphere over Region 4 and adjacent waters.
- Temporal - analysis, 36, 48, and 72-hour forecasts from the
0000-UTC and 1200-UTC data bases and 4, 5, 6, and 7-day forecast fields from
the 0000-UTC data base
- Horizontal - "thinned" 1.25 x 1.25 degrees (lat/long) at the
equator (about 140 kilometers globally)
- Vertical - WMO-required levels including total precipitation
Pressure (hPa) U V Fields (analysis only)
Geographical Coverage is defined by 3 octant segments in the
range I, K, L, with the additional octant of J for analysis fields.
- I = 0-90N 30W-60E,
- K = 0-90N 150E-120W,
- L = 0-90N 120W-30W,
- J = 0-90S 90W-180W
GTS Broadcast - The GTS Broadcast will initially include the following data for
- Surface synoptic, ship, upper air in TEMP code, oceanographic, and
climatic coded bulletins from specific geographical areas of concern.
- Analysis bulletins for thickness, cyclone, surface fields for the
southern part of Region 4.
- Satellite coded bulletins for areas of concern.
- Marine warnings, hurricane, and other related warnings.
T4 Graphics - The T4 Coded Charts/Graphics Data includes the information provided
which can not be converted to GRIB code form. Significant weather
charts prepared by the U.S. and surface analysis over ocean areas are provided
in support of meteorological activities.