3. Mist and Fog Forecasting Techniques

3. Mist and Fog Forecasting Techniques Mist is defined as .. a suspension in the air of microscopic water droplets or wet hygroscopic particles, reducing visibility at the earth's surface. used when visibility is 1000m and 5000m and RH >95%. Tdry-Tdew C. Crown copyright 2004 Page 2. Fog is defined as .. a suspension of microscopic water droplets in the air reducing visibility at the earth's surface to: < 1000m for met. observations, aviation and shipping < 200m (dense fog) for public service purposes Tdry Tdew. Crown copyright 2004 Page 3. Freezing fog and ice fog Freezing fog Supercooled drops which freeze on impact with a surface (produce rime). Ice fog Tiny suspended ice particles Requires T -30 C. Crown copyright 2004 Page 4. Fog types There are three main types: Radiation fog Warm Advection fog Upslope fog Crown copyright 2004 Page 5. RADIATION FOG. Crown copyright 2004 Page 6. Radiation fog formation Overnight clear skies Moist air in lowest 100m Moist ground Light surface wind = fog >5KT surface wind = low cloud (turbulent stratus).

3. Mist and Fog Forecasting Techniques. © Crown copyright 2004 Page 2 Mist is defined as ... … a suspension in the air of microscopic

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