WINTER WEATHER Using the Critical Thickness Plots More detail on critical thicknesses Distinguishing Precipitation Type on Radar Snow in Clear-Air Mode Estimating Precip Type from Soundings: Snow | Sleet | Freezing Rain More Detailed Sounding Help: Snow | Freezing Rain Heavy Snow Mesoscale Discussion from the Storm Prediction Center Wind Chill Chart Thunderstorms & Tornadoes Flooding Fire Weather Heat & Drought General Radar Interpretation OK-FIRST Project, Oklahoma Climatological Survey, 100 East Boyd Street, Suite 1210, Norman, OK 73019. Copyright © 1996-2005 Oklahoma Climatological Survey. All Rights Reserved. Send comments or questions concerning OK-FIRST to okfirst@mesonet.org