THUNDERSTORMS & TORNADOES Bounded Weak Echo Region Bow Echo Cold Front Day 1 Convective Outlook from the Storm Prediction Center Day 1 Probabilistic Outlook for Tornadoes from the Storm Prediction Center Day 1 Probabilistic Outlook for Large Hail from the Storm Prediction Center Day 1 Probabilistic Outlook for Severe Winds from the Storm Prediction Center Comparison of Day 1 Probabilistic and Categorical Outlooks from the Storm Prediction Center Day 2 Convective Outlook from the Storm Prediction Center Day 2 Probabilistic Outlook from the Storm Prediction Center Dry Line as Radar Thin Line Dry Line & Cold Front in Dew Point Dry Line & Cold Front Intersection Equivalent Potential Temperature Hail and Composite Reflectivity Hail and Vertically Integrated Liquid Hail Scatter Spike Hook Echo Mesocyclone in Base Velocity Mesocyclone in Storm-Relative Velocity Mesocyclone Algorithm Outflow Boundaries Propagation of Radar Beam Thunderstorm Initiation Tornado Detection Algorithm Flooding Winter Weather Fire Weather Heat & Drought General Radar Interpretation OK-FIRST Project, Oklahoma Climatological Survey, 100 East Boyd Street, Suite 1210, Norman, OK 73019. Copyright © 1996-2004 Oklahoma Climatological Survey. All Rights Reserved. Send comments or questions concerning OK-FIRST to okfirst@mesonet.org