The Winnograd is due out tomorrow. There are reports that indicate a major snow storm is on the way. The Winnograd committee is demanding the roads be clear so they can deliver the report.

Olmert is probably calculating if the snow is good for him, or bad for him.

If the roads are difficult to travel on, less people will be able to go out to protest in Jerusalem, if it is too cold out, people won't go to the streets, and if it is a blizzard, everyone will be too busy playing in the snow.

Alternatively...

No one will be preoccupied with work that day, so they will go out and protest.

So, does he plow the highway or not?