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Fog Calculator

T at 12 UTC (°C) Td at 12 UTC (°C) Mean* cloud amount (oktas) 0-2 2-4 4-6 6-8 Mean* geostrophic wind speed (kn) 0-12   13-25 * = mean of forecast values for 1800, 0000 and 0600 UTC Calculated Tfog °C   Tfog - Tmin (°C) Forecast ≥ +1 Widespread fog = 0.5 Risk for fog at end of night = 0 Fogpatches around sunrise -0.5 tot -1.5 Fogpatches on favorable spots ≤ -2 No fog