Al Gore was in Vegas in early April talking at the wireless show:

Speaking at the International CTIA Wireless 09 in Las Vegas Friday morning, former U.S. vice president Al Gore called for the wireless industry to take the lead in building a “green” infrastructure across several vertical industries including utilities.

And I saw this story up on Drudge today:

A chill moved across Las Vegas late Tuesday and Wednesday, bringing lower temperatures and strong winds to the valley.
Five inches of snow fell Tuesday night on Mount Charleston, and trace amounts of rain were recorded at McCarran International Airport.
The National Weather Service said Wednesday’s high was 59 degrees, which fell short of the record low high of 56 degrees set in 1998.
“This is definitely not your typical April day,” said Barry Pierce, weather service meteorologist.
Flurries were spotted in parts of Summerlin and Henderson, while in other parts of Las Vegas, high winds took shingles off homes.

We’ll have to defer to the judges on this one, but I think a snow storm roughly two weeks after the Goracle’s talk still counts as a Gore-Effect event.