Low pressure system, (midlatitude) cyclone, or just storm.
Stationary front
No. Generally low pressure brings clouds and precipitation.
Mammatus. Mammatus is cloud that hangs from an anvil of a mature storm cloud and brings severe weather especially tornadoes. Another one is called Cumulonimbus. These clouds bring VERY heavy rain or thunder storms.
cumulus clouds can bring good or bad weather. if there is alot of convection, the cloud will grow taller and develope into cumulus congestus then to cumulonimbus. this brings thunderstorms. however, sometimes the air is very stable so cumulus clouds flatten to cumulus humilis and stay the "fair weather cumulus" clouds everyone loves
blue
it brings in fair weather
low
Stationary front
No, that's high pressure. High pressure has sinking air and fair weather. Low pressure is rising air and usually brings lots of clouds and precipitation.
Cumulus clouds bring good weather. They are the white, puffy ones of sunny days
They are called "cumulus" clouds, and sometimes are colloquially called "fair weather" clouds.
Low pressure usually brings stormy weather. The clouds hang over and area for a period of time and then the rain and storm begins.
These clouds are called nimbostratus,cumlus ,cumulonimbus
Stratocumulus clouds brings very little precipitation but they can bring light drizzle or a tad bit of snow.
No. Generally low pressure brings clouds and precipitation.
Strong storms and severe weather like a Cold Front. It also brings about Cumulonimbus clouds.
Cyclones - air cools and clouds form and may cause rainy or stormy weather. Anticyclones - it brings dry and clear weather.