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NRT Sounding Data Products
The main parameters in the NRT sounding data products are:
- Refractivity, N
- Temperature, T
- Pressure, P
- Specific humidity, SH
- Surface pressure, SP
In addition, various supporting data and selected parameters from the level 1b data products
(with some post-processing applied) are included with the level 2 NRT sounding data products.
The NRT products are delivered less than three hours after measurement, making them the choice for NWP users.
| Refractivity profile |
| Quantity | Values | Remarks |
| Units | Refractivity units (N) | Neutral atmosphere |
| Domain | 0-50 km | Surface to 1 hPa |
| Range | 0-450 N-units |
| Precision | 0.1 N-units |
| Vertical sampling | 0.5 km |
| Accuracy | 1 N-unit or 0.3 % | whichever is greater |
| Temperature profile |
| Quantity | Values | Remarks |
| Units | Kelvin (K) |
| Domain | 0-50 km | Surface to 1 hPa |
| Range | 180-350 K |
| Precision | 0.1 K |
| Vertical sampling | 0.5 km | depends on background pressure levels |
| Accuracy | 0-5 km, 5-30 km, 30-40 km, 40-50 km | 2-3 K, 1 K, 1-5 K, 5-10 K |
| Specific humidity profile |
| Quantity | Values | Remarks |
| Units | kg/kg | Specific humidity |
| Domain | 0-15 km | Surface to 100 hPa |
| Range | 0-50 g/kg |
| Precision | 0.001 g/kg |
| Vertical sampling | 0.5 km | depends on background pressure levels |
| Accuracy | 10 % or 0.2 g/kg | whichever is greatest |
| Pressure profile |
| Quantity | Values | Remarks |
| Units | hectopascals (hPa) |
| Domain | 0-50km | Surface to 1 hPa |
| Range | 0.01-1100 hPa |
| Precision | 0.001 hPa |
| Vertical sampling | 0.5 km | depends on background pressure levels |
| Accuracy | 0.2 % or 2 hPa | whichever is greatest |
| Surface pressure |
| Quantity | Values | Remarks |
| Units | hectopascals (hPa) |
| Domain | Surface (mean sea level) | Horizontal location nominally at the location of the lowest point in the refractivity profile. |
| Range | 900-1100 hPa |
| Precision | 0.001 hPa |
| Vertical sampling | N/A |
| Accuracy | 0.2 % or 2 hPa | whichever is greatest |
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