Shortwaves indicate near events, a high short spike usually means a short term major event is about to happen in that area.
Longwaves and steady increases usually mean a large scale change is developing in the area that will effect a large area’s upper level jet stream.
M1 – M2 – Slight change is expected, but overall the weather pattern is not being affected.
M3 – M5 – Change is expected and the reading indicates between then and and a few days it will happen. This is considered a moderate reading, which if a short spike can be a nearby event such as severe weather, unexpected lightning, or a tornado.
M6 – M9 – Significant change is expected. Anything over M7 is rare and special attention must be directed when readings go seven and higher. Severe storms are associated with this reading, which if a short spike can be a nearby event and a long duration and slow build being a large scale change.
M10 – Associated with tornado outbreaks. This also can be strong hurricanes and blizzards.
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