Here is all the pertinent weather information to go check out before flying:

Flying Weather & Forecasts

USAIR Net Launch Code - Forecasts

Forecast - Winds Aloft(forecast)

Soaring Forecast & Winds Aloft (actual)

Another Winds Aloft Forecast

Salt Lake City Area Forecasts

5-Day Outlook for Point of the Mountain

Forecast Discussion - Detailed Weather Information 

Surface Winds & Forecasts

Utah Mesonet - Wind Readings - Wasatch Front

Salt Lake City Airport #2

Intellicast - Current Winds

Intellicast - Wind Forecast