How do I use a timeseries data in simulink

Hi, I am using Matlab R2011a version. I want to use a wind speed data in simulink. The data file is a .mat file consisting of wind speed data for 3 years. I wrote down this code in the editor to load the .mat file:

load('u_W_3years.mat')

u_ts = u_W_3years;

I put the data name as 'u_ts' in the from workspace block parameter in simulink. But when I run the simulink file it gives me an error saying:

"Unsupported input format for From Workspace block 'Wind_Electrolyzer/From Workspace'. Available formats include: (1) a double non-complex matrix, (2) a structure with or without time, (3) a Simulink.Timeseries object. All formats require the data to be finite (not Inf or NaN)."

Am I missing anything? Does the 2011 version not support inputs in the form of a time series for the From Workspace block?

Thank you for the help

Ushnik