Areas of Severe Thunderstorms and Excessive Rainfall; Heat Wave Builds in the Intermountain West and Plains

A slow moving front will bring rounds of strong to severe thunderstorms and heavy rainfall to the central Plains eastward to the east-central U.S.. The first widespread significant heat wave of summer for the Intermountain West and Plains is expected to develop today and expand through next week. Dangerous heat will continue to impact portions of the Southwest and Southeast. Read More >

Dispersion Index Table

DISPERSION INDEX TABLE

Dispersion Index	Interpretation
>100	Very Good (but may indirectly indicate hazardous conditions.)
60-100	Good (typical burning values)
41-60	Fair to Good (climatological afternoon values for most inland forests.)
21-40	Fair (stagnation if accompanied by persistent low wind speeds.)
13-20	Poor to Fair (stagnation, if persistent; better than average for nighttime.)
7-12	Poor (stagnant, but near average at nighttime.)
1-6	Very Poor (climatological nighttime value for most locations.)