What's most reliable indicator you should use when determining if you should modify activity for heat? Local weather report Wet bulb temperature taken at your field Heat index Humidity percentago

## Step 1<br />The problem is asking for the most reliable indicator to use when determining if you should modify activity for heat. The options provided are: Local weather report, Wet bulb temperature taken at your field, Heat index, and Humidity percentage.<br /><br />## Step 2<br />The wet bulb temperature is the temperature a parcel of air would have if it were cooled to saturation (100% relative humidity) by the evaporation of water into it. This is a more accurate measure of the heat stress on the human body than the other options.<br /><br />## Step 3<br />The local weather report, heat index, and humidity percentage can all be influenced by a variety of factors and may not accurately reflect the heat stress on the human body. The wet bulb temperature, on the other hand, is a direct measure of the heat stress on the human body and is therefore the most reliable indicator.