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.
Step 3. When those tubes are ingested into the updraft, they become vertical and the storm acquires rotation, forming a supercell. Step 4. The rotating tube is stretched, and the supercell becomes like a giant vacuum, sucking air up and away. As air rushes in to equalize the pressure, a tornado is formed.