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.
As it is always warmer than the surrounding air, it continues rising. Low pressure leads to unstable air conditions. When the ground is heated, the air will rise and keep rising. Eventually, the rising air will cool enough to produce condensation (cloud and rain).When the atmosphere is at high pressure, the rising air bubble is always cooler than the surrounding air.hen the ground is heated, the air will not rise. If air does not rise, rain cannot condense. Convection rain requires a warm ground and low pressure. It causes short showers interspaced with sunny periods.