This chart shows 7-day mean anomalies of wind speed and direction from the ECMWF Sub-seasonal ...

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The ECMWF seasonal forecasts (SEAS5) are produced every month with a 51-member ensemble at a ...

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The ECMWF seasonal forecasts (SEAS5) are produced every month with a 51-member ensemble at a ...

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The charts show mean frequency and accumulated cyclone energy of tropical storm activity. ...

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This chart provides information on the verification of forecasts of the expected number of ...

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The charts show the evolution of existing and potential tropical cyclone activity. ...

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The 850 hPa level is usually just above the boundary layer and at this level the day-night variation in temperature is generally negligible...

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Wind speed at 200 hPa highlights the jet stream (areas of strong winds in the upper troposphere) which can help identify movement and development of depressions...

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Wind speeds near the surface are roughly proportional to the distance between isobars so closely packed isobars mean strong surface winds...

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In the northern hemisphere the air rotates anti-clockwise around low contour centres and clockwise around the high contour centres. In the southern hemisphere the air rotates clockwise around low contour centres and ...

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The air flow is not the same at all levels and can be very different in strength and direction when associated with vigorous weather systems...

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These charts show the difference between the latest HRES Long Window Data Analysis (LWDA) for the main synoptic hours of 00, 06, 12 and 18UTC, and its corresponding background field taken from the previous HRES LWDA run with the same validity time...

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The CAT (Clear Air Turbulence) parameter is given in units of the turbulent Eddy Dissipation Rate (EDR), product shows EDR values on selected flight levels overlayed with wind speeds.

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Cloud base height is derived by upwardly searching the structure of the model atmosphere to find the altitude where the cloud fraction becomes >1% and...

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Divergence of horizontal air flow or winds is a measure of the spreading out of air at a particular point. Divergence is +ve where air spreads out; –ve where air converges...

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These charts show areas where anomalous 2 m maximum temperatures are likely to occur. These charts are based on the ECMWF ensem ...

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These charts show areas where anomalous 2 m minimum temperatures are likely to occur. These charts are based on the ECMWF ensem ...

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These charts show areas where anomalous 2 m temperatures are likely to occur. These charts are based on the ECMWF ensemble forecas ...

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These charts aim to provide pointers to areas where anomalous precipitation amounts are likely to occur during the 24 hour, 2 day, 5 day or 10 day period previous to the selected validity time...

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These charts show areas where anomalous snow fall is likely to occur. These charts are based on the ECMWF ensemble for ...

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These charts aim to provide pointers to areas where anomalous values of water vapour flux are likely to occur based on the ECMWF en ...

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These charts show areas where anomalous 10 m wind gusts are likely to occur. These charts are based on the ECMWF ensemble fore ...

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These charts show areas where anomalous 10 m wind speeds are likely to occur. These charts are based on the ECMWF ensemble for ...

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These charts show the mean and variation in the latest ECMWF ensemble forecast (ENS). ...

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These charts show the mean and variation in the latest ECMWF ensemble forecast (ENS). ...

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