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: 3684
Waterspout
Tornado over water often quite tall and skinny
Reported: 119
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: 5569
Heavy Snow
Snow accumulating quickly with low visibility
Reported: 14573
High Wind
Wind not associated with convective thunderstorm activity
Reported: 16372
Large Hail
Ice stones with diameter greater than pea-sized or 0.25"
Reported: 42578
Sleet
Clear ice pellets or white graupel, mostly spherical in shape
Reported: 1909
Snow
Light or moderate accumulating snowfall
Reported: 184989
Thunderstorm Wind
Thunderstorm wind gust either estimated or measured
Reported: 47524
Level 3 - Neature
Not always dangerous, but always neat!
Flood
Any situation where water is blocking land or roads causing problems
Reported: 12321
Level 4 - Just Cus
Rain
Liquid precipitation (inches)
Reported: 55474