d20WeatherDetection DC ModifierTravel ModifierSpecial
1-12Clear+0+0None
13-15Overcast / Wind+1+0Minor visibility reduction
16-17Rain / Dust Storm+2+1 hour per tileReduced visibility, difficult terrain
18-19Heavy Storm+4+2 hours per tile🚗 Pilot Tests required for vehicles, extreme visibility loss
20Radiation Storm+2+0All exposed characters take RAD damage per tile traversed. Must find shelter or push through.

Ghouls and Radiation Storms: A Ghoul’s immunity to radiation creates an interesting party dynamic during a Radiation Storm. The Ghoul can continue traveling safely while the rest of the party must shelter or suffer. This may lead to split-party scenarios where the Ghoul scouts ahead while the others wait out the storm.