The timing of this significant rainfall event is particularly concerning for communities in the Southwest and Southern California that have recently experienced flooding. The ground in many areas may already be saturated, increasing the likelihood and severity of subsequent flooding, flash floods, and dangerous debris flows. These conditions pose a direct threat to residents, infrastructure, and property. Specifically, the cities being monitored—Phoenix, Flagstaff, Durango, and Farmington—and their surrounding regions are vulnerable. Flash floods can develop rapidly, catching people off guard, while debris flows, carrying mud, rocks, and vegetation, can be incredibly destructive and life-threatening. The potential for high rainfall totals in mountainous areas also raises concerns for downstream communities. Travelers planning to be in these regions over the holiday weekend should exercise extreme caution and stay informed about weather alerts.