Rounded, smooth, sack-like protrusions hanging from the underside of a cloud (usually a thunderstorm anvil). Mammatus clouds often accompany severe thunderstorms, but do not produce severe weather; they may accompany non-severe storms as well.

By | January 30th, 2017|Uncategorized|0 Comments


A rotating air mass within a thunderstorm which may produce a tornado,  usually 2-6 miles in diameter and often found on the right rear flank of a supercell thunderstorm. On high-precipitation (HP) supercell, the mesocyclone may be found on the front flank.  Although strictly speaking a radar term, a supercell may exhibit visual cues indicating [...]

By | January 15th, 2016|, , |0 Comments


Referring to weather systems smaller than synoptic-scale systems but larger than storm-scale systems. Horizontal dimensions generally range from around 50 miles to several hundred miles. Squall lines and Mesoscale Convective Systems (MCS) are examples of mesoscale weather systems

By | January 15th, 2016||0 Comments

Mesoscale Discussion

When conditions actually begin to shape up for severe weather, SPC (Storm Prediction Center) often issues a Mesoscale Discussion (MCD) statement anywhere from roughly half an hour to several hours before issuing a weather watch. SPC also puts out MCDs for hazardous winter weather events on the mesoscale, such as locally heavy snow, blizzards and [...]


A convective downdraft with an affected outflow area of less than 2 ½ miles wide and peak winds lasting less than 5 minutes. Microbursts may induce dangerous horizontal/vertical wind shears, which can  cause property damage.

By | December 1st, 2016|, |0 Comments