Catawba rhododendron bushes can reach a height of 6'-8' with a spread of 4'-6'. Displays are most effective when rhododendron bushes are massed together. These are poisonous plants -- do not allow children to ingest any of the azaleas or rhododendrons.
Best Answer: Tornadoes are caused by winds. When a tornado forms the wind pressure around the tornado drops and that's what you see on the barometer, the pressure goes down.
Barometric Pressure and Weather Conditions. General Observations. Low and High Air Pressure Low air pressure= less weight pushing down= air is rising and cooling which helps form clouds. High air pressure= more weight pushing down= air is sinking and warming with less humidity. Falling or Low Barometric Pressure Deteriorating weather or some form of precipitation such as wet and/or windy conditions and thunder in hot weather are associated with falling barometric pressure. As a storm approaches air pressure begins to fall and this can happen very quickly.