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Web site navigation is primitive. May use as a reference, but not as a stand alone tool for students as the weather and cloud unit is in second grade and the web site reading level and navigation are a bit higher level. Cloud concentration worked, but not cloud matching. Lincoln Public - science - weather - second grade Understand how to measure weather conditions (temperature, wind direction and precipitation). Identify the three main types of clouds (cumulus, cirrus and stratus). Measure, record and explain the changes in temperature, wind direction, precipitation and types of clouds over five days. Identify the causes of thunder and lightning and ways to stay safe around them. Identify the causes of tornadoes and safety measures during them.