|
This is a general severe weather probability, based on values of Upward Helicity (UH). We keep track of how many 4 km grid elements have reached a critical UH threshold value.
In its most simple form, if there are 4 grid elements that have reached critical values in a 24 km X 24 km square area, then the probability is about 11% that any person in this area will experience a severe weather event (i.e, a Tornado, Hail, or Strong Wind).
This is a general severe weather probability, based on values of Total Lightning. We keep track of how many 4 km grid elements have reached a critical threshold value of Total Lightning.
In its most simple form, if there are 4 grid elements that have reached critical values in a 24 km X 24 km square area, then the probability is about 11% that any person in this area will experience a severe weather event (i.e, a Tornado, Hail, or Strong Wind).
This is a general severe weather probability, based on a linear combination of Upward Helicity and Total Lightning. We keep track of how many 4 km grid elements have reached a critical threshold value of either parameter.
In its most simple form, if there are 4 grid elements that have reached critical values in a 24 km X 24 km square area, then the probability is about 11% that any person in this area will experience a severe weather event (i.e, a Tornado, Hail, or Strong Wind).
|
|