Ethylene glycol can be diluted in a solution of 50 per cent water and 50 per cent coolant (or antifreeze!) to lower the freezing temperature of the fluid in your radiator by 60 genres or more. That's cold. But coolant isn't finished amazing you yet.
A severe thunderstorm warning, on the other hand, is not issued until such a storm has been physically observed or is spotted on radar. A tornado watch is issued when conditions may produce a tornado, and a warning is issued when a tornado has been sighted, or when rotation is seen on radar.
As the event becomes imminent, a watch will normally be upgraded to either a warning or an advisory (which indicates an 80% or greater probability of occurence). A Warning indicates that conditions pose a threat to life or property, and that travel will become difficult to impossible.