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Soundings through the depth of the atmosphere.
Sample content — not an operational product
The sounding data on this page is not yet published from the GMS forecast system. The figures on this page are illustrative and must not be used for any weather, marine or safety decision.
| Level | Height | Temperature | Wind |
|---|---|---|---|
| Surface | 0 m | 28.0 °C | NE 14 kt |
| 925 hPa | 760 m | 22.4 °C | ENE 18 kt |
| 850 hPa | 1500 m | 17.8 °C | E 20 kt |
| 700 hPa | 3100 m | 8.2 °C | E 15 kt |
| 500 hPa | 5850 m | −6.4 °C | ESE 12 kt |
| 300 hPa | 9600 m | −36.2 °C | SE 18 kt |
| 200 hPa | 12 400 m | −58.0 °C | S 22 kt |
Surface observations describe one level. A sounding describes the whole column — where the moisture sits, where the air is stable or unstable, and how the wind changes with height.
That profile is what separates a day of harmless fair-weather cloud from a day of deep convection and thunderstorms, even when the surface conditions look identical.
Soundings also anchor the models. A global model with no observation over the tropical Atlantic is guessing at the vertical structure it is supposed to be forecasting.
Upper-air observations for the Eastern Caribbean come from a small number of stations across the region, and each one covers a large area of ocean. Their value to Grenada's forecast is out of proportion to their number.