Show gray view hour before storm proper fire nimbus leaden hued thunder cal under sis present along west east ax bet bet met body warm air wind rain InK hail hail hall 1111 1111 earth rain disturbance rain filled space earth lower base direct CROSS SECTION thunderstorm bring compact travel west east 20 40 miles hour concave front advance above cross section vt cloud along surface earth drawn moisture duration storm OFA 9 section blanket ominous preliminary actual cloud center cloud storm cloud supply ply squall io |