Precipitating clouds in and behind two occluded fronts and a cold front were convective clouds. Precipitating clouds in the centre of a cyclone were also convective, while precipitating clouds behind the cyclone were stratiform. Some clouds contained no liquid water, but others contained a substantial...
Generally, precipitation associated with nimbostratus is long in duration. The intensity can vary from light to heavy depending on the associated conditions. Normally, light to moderate rain is associated with nimbostratus. However, the passage of strong lows and cold fronts can produce moderate to h...
Advancing cold fronts have also triggered roll clouds, on occasion. The National Weather Service in Lubbock, Texas, documented a spectacular case of cold-frontal roll clouds in late September 2007. We always love your spectacular weather photos. Upload them to us at weather.com/photos, or share...
Like wall clouds, shelf clouds also form underneath thunderstorm clouds. As you can imagine, this fact doesn't help observers differentiate between the two. While one is easily mistaken for the other to the untrained eye, cloud spotters know that a shelf cloud is associated with thunderstorm ou...
Cold fronts moving across the land sometimes collide with warm fronts that usually produce thunderstorms. The cold air mass is heavier and denser than the warm air in a warm front. The cold air pushes its way beneath the warm air forcing it to rapidly rise as the cold air pushes through ...
the drier the soil the quicker the mixing out of low clouds. Of course other factors come into play. You will have to also look at synoptic scale processes such as fronts,thermal advectionandvorticity advectionto determine when cloud cover might break. An increase of surface cold/dry air adve...
Altocumulus are often spotted on warm and humid mornings, especially during summer. They can signal thunderstorms to come later in the day. You may also see them out ahead ofcold fronts, in which case they signal the onset of cooler temperatures. ...
Air is also forced to rise at a weather front. This is due to the differing air masses of the two weather fronts. At cold fronts, cold air is pushed under warm air, forcing it upward and at a warm front, warm moist air is forced up and over the cold air. This process is called...
Explain why squall line thunderstorms often form ahead of advancing cold fronts but seldom behind them. Why does it rain? Why are mandrills called mandrills? Why is Salton Sea called a sea? Why does vapor pressure increase with temperature?Explore...
Cirrus cloud layers are in general statically stable in an absolute sense, with lapse rates less than the moist-adiabatic rates with respect to either water or ice. Some cirrus clouds are located above stable layers, indicating that they are associated with upper-level fronts. Others are below ...