If the operator feels there is sufficient rotation or there is a sign that a storm is capable of producing a tornado, large hail, or damaging winds, they would issue a warning. If they feel it is not strong enough, then no warning is issued, according to Dunn.

The NWS Blacksburg VA released a severe thunderstorm warning at 8:27 p.m. on Sunday in effect until 9:30 p.m. for Rockingham and Stokes counties.