Less critical event when minor flooding of underpasses, street, low lying areas, small streams and drainage channels occurs. Forecast of stage and time of crest on major riverine systems. Levels of warning stage and flood stage. Also tidal effects in Delta area. From minor tidal overflow to major inundation of coastal sections.
Factors contributing are storm surge, tidal cycle and beach topography.
A violently rotating column of air pendulant from a cumulonimbus cloud and touching the ground. Hazardous driving conditions caused by snow, ice, fog, wind, dust etc.