9/2/2023 0 Comments Black fog weather![]() During this time, we could see snow in the hills, and it’s possible we see some lowland snow or a mixed precipitation late Wednesday into Thursday. We will also see some wet weather each day Tuesday through Thursday. Next week temperatures will be much cooler, in the mid 40s Monday, then in the low 40s and even upper 30s through Thursday. ![]() In the valleys, we will see rain for the day Sunday and showers will come to an end early Monday. Travel will likely be difficult during this time. Because of this, the National Weather Service has issued a Winter Storm Warning for the south Washington and Oregon Cascades. We are expecting somewhere between 12-24″ at the mountain between late Saturday night and Monday morning. This and dropping snow levels will lead to a significant amount of snow at the mountain. Late tomorrow night, showers will pick up at the mountain, as rain approaches the valley early Sunday morning. Temperatures will be similar to what we saw today. Tomorrow, we have a mainly dry day and will likely see fog develop once again in the morning. With showers this evening, it’s possible we get some snow into the Cascade passes, but likely only somewhere between a trace to 1″. High temperatures today will be cooler than yesterday though, topping out in the upper 40s for the metro area. Later in the evening, we will see the skies drying out. We will experience a rainy afternoon at the beginning of the evening. If you have early shopping to do, the weather isn’t too difficult, but there are areas of patchy and dense fog out there! It’s possible we see a shower this morning, but wet weather should be coming a little later today. (KPTV) - Good morning and hope your Black Friday is off to a great start! This often occurs in autumn when sea temperatures are still relatively warm after the summer, but the air is already starting to cool.PORTLAND Ore. Cold fronts or cool air masses move over warm seas.Cold air moves over heated outdoor swimming pools or hot tubs, where steam fog easily forms.The warm, moist air cools as it mixes with the colder air, allowing condensation and fog to occur.Įvaporation fog can be one of the most localised forms of fog. When some of the relatively warm water evaporates into low air layers, it warms the air, causing it to rise and mix with the cooler air that has passed over the surface. ![]() ![]() It often causes freezing fog, or sometimes frost. Evaporation fogĮvaporation fog is caused by cold air passing over warmer water or moist land. The air cools as it rises, allowing moisture in it to condense. Upslope fog or hill fog forms when winds blow air up a slope (called orographic uplift). If the wind blows in the right direction, then sea fog can become transported over coastal land areas. ![]() It is also common at sea when moist tropical air moves over cooler waters. A common example of this is when a warm front passes over an area with snow cover. Advection fogĪdvection fog occurs when moist, warm air passes over a colder surface and is cooled. Valley fog is confined by local topography and can last for several days in calm conditions during the winter. It is often the result of a temperature inversion, with warmer air passing above the valley. Valley fog forms where cold dense air settles into the lower parts of a valley, condensing and forming fog. An exception to this can be in high elevation areas where the Sun has little influence in heating the surface. Radiation fog usually dissipates soon after sunrise as the ground warms. This reduces the ability of the air to hold moisture, allowing condensation and fog to occur. The cooling of land overnight by thermal radiation cools the air close to the surface. Radiation fog usually occurs in the winter, aided by clear skies and calm conditions. ![]()
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