A forecast indicates a dew point temperature equal to the air temperature. What does this imply?

relative humidity is 100% and it may rain
relative humidity is 0 and there is no chance of rain
relative humidity is 0 and it may rain
relative humidity is 100% and there is no chance of rain

The correct answer is "relative humidity is 100% and it may rain." When the dew point temperature is equal to the air temperature, it indicates that the air is fully saturated with moisture, resulting in a relative humidity of 100%. This high level of moisture in the air increases the likelihood of precipitation, such as rain.