Creating a form that sets multiple fields to required if Date field is populated

I have an existing (tree planting) form that I am making fillable. The Satisfactory, Marginal, and Severe fields are all ‘date’ fields. If a date is placed in the “Severe” column, I need it to require the completion of the Temp, RH, Wind and Soil_Moisture1/2 in the “If Planting On A Severe Day” column.
Most of the time, only one day may be severe, so whichever cell is “Severe(1-4)” It needs to go in the Temp1, RH1, Wind1, and Soil_Moisture1 first followed by the second set of readings.
Thanks in advance
Doug
