Level 1 - Classic
Tornadoes, damaging wind, and hail...oh my. Commonly reported weather conditions that will get out of hand quickly! Seeing one of these might make you say "Holy shnikes!".
Tornado
Distinct rotating column beneath wall cloud in connection with the ground
Reported: 3844
Level 2 - Number 2's
Expanding on classic observation types, witnessing these could be a once in every three year occurrence!
Damage
Severe weather damage
Dense Fog
Water vapor condensing into clouds at ground level
Reported: 142
Freezing Rain
Liquid rain freezes to ground and elevated surfaces on contact.
Reported: 5626
Heavy Snow
Snow accumulating quickly with low visibility
Reported: 14839
High Wind
Wind not associated with convective thunderstorm activity
Reported: 16672
Large Hail
Ice stones with diameter greater than pea-sized or 0.25"
Reported: 44058
Sleet
Clear ice pellets or white graupel, mostly spherical in shape
Reported: 1923
Snow
Light or moderate accumulating snowfall
Reported: 188142
Thunderstorm Wind
Thunderstorm wind gust either estimated or measured
Reported: 49718
Level 3 - Neature
Not always dangerous, but always neat!
Flood
Any situation where water is blocking land or roads causing problems
Reported: 12643
Level 4 - Just Cus
Rain
Liquid precipitation (inches)
Reported: 56687