Mud SlideFast moving soil, rocks and water that flow down mountain slopes and canyons during a heavy downpour of rain.
MuggyA subjective term for warm and excessively humid conditions.
MULIMost Unstable Lifted Index - Lifted Index (LI) calculated using a parcel from the pressure level that results in the Most Unstable value (lowest value) of…
Multicell ThunderstormThese thunderstorms are organized in clusters of at least 2-4 short-lived cells.
Multiple Doppler AnalysisThe use of more than one radar (and hence more than one look angle) to reconstruct spatial distributions of the 2D or 3D wind field, which cannot be…
Multiple Vortex TornadoA tornado in which two or more condensation funnels or debris clouds are present at the same time, often rotating about a common center or about each…
Multipurpose ReservoirA reservoir constructed and equipped to provide storage and release of water for two or more purposes such as flood control, power development…
Municipal Solid Waste (MSW)Waste material from households and businesses in a community that is not regulated as hazardous.
Municipal Use of WaterThe various uses of water in developed urban areas, including domestic use, industrial use, street sprinkling, fire protection, etc.
MushroomSlang for a thunderstorm with a well-defined anvil rollover, and thus having a visual appearance resembling a mushroom.
MVFRMarginal Visual Flight Rules - in an aviation product, refers to the general weather conditions pilots can expect at the surface.