The Sweet 16 of BSA Safety describe the measures we should use at all Scouting activities. The ninth point of the Sweet 16 is Weather Check (see below).
We’ve seen a lot of crazy weather over the last few months, so hopefully everyone knows to use their heads about the weather. It is important to know the difference between uncomfortable weather and hazardous weather. We don’t want to cancel every time there is a chance of rain, but we do need to find out if those storms heading our way could include lightening or could spawn tornadoes. BSA provides a great online course for learning about hazardous weather. Check my article Weather Hazards Online Training for more information.
From the Sweet 16 of BSA Safety on the Scouting.org website:
8. WEATHER CHECK
The risk factors in many outdoor activities vary substantially with weather conditions. These variables and the appropriate response should be understood and anticipated.