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.
First and foremost, a tornado is a spinning pillar of air formed when cold air from the sky meets the warm air on land. This causes instability in pressure and makes the warmer air rise. After this happens, a tornado is born within a giant, rotating thunderstorm.