Published July 21, 2010

Two in one week, Toto!

What’s with all the twista warnings lately? Not watches, mind you. Warnings are more severe and much less common. They come and go in a flash. There have been two tornado warnings this week in Worcester County, the most recent one just a few minutes ago.

Confused? (I was.) Here’s the National Weather Service definition of watch:

A watch is used when the risk of a hazardous weather or hydrologic event has increased significantly, but its occurrence, location, and/or timing is still uncertain. It is intended to provide enough lead time so that those who need to set their plans in motion can do so.

And the definition of warning:

A warning is issued when a hazardous weather or hydrologic event is occurring, is imminent, or has a very high probability of occurring. A warning is used for conditions posing a threat to life or property.

In other words, if you hear a warning, get moving. What to do if you get caught in a tornado? The NWS has a complete guide, but:

• Avoid windows.
• Get to the lowest floor — the basement, if there is one.
• If you’re in a car, park it safely and get out. Find shelter in a building.
• If you can’t find shelter, lie flat on the ground and cover your head. Stay away from trees and cars.

Watch out for severe thunderstorms throughout Massachusetts until 8 p.m. That’s a watch, not a warning!