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Frequently asked questions

What is a 4 km grid or a 1.5 km grid?

This is the approximate horizontal distance between the points at which the parameters describing the weather condition (temperature, pressure, etc.) are determined. More technically, it is the horizontal distance between consecutive nodes of the computational grid.

How often and at what times are the weather forecasts updated?

The UM model is calculated 4 times a day for the initial conditions at 00, 06, 12 and 18 o'clock (according to UTC time). Forecasts appear on the website approximately 4.5 hours after the time specified as the start of the forecast. WRF model updates take place 2 times per day for initial conditions at 00 and 12 UTC. The visualised calculation results are available on the website approximately 6.5 hours after the start of the forecast. The start of the forecast is at 03 and 15 UTC.