Briefing for Impacts from Snow and Rain Storm on Tuesday

A storm system will bring snow and rain to the region on Tuesday. Impacts are expected from snowfall during the Tuesday morning commute and potentially the Tuesday evening commute across portions of eastern PA and northern NJ. See the linked briefing package for details. 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.)