Central Arizona MCS Primed for 80 MPH Downbursts and Haboobs — SevereWX

Central Arizona MCS Primed for 80 MPH Downbursts and Haboobs

An intensifying cluster of thunderstorms over central Arizona is evolving into a loosely organized Mesoscale Convective System (MCS), drifting south-southwestward off higher terrain toward lower elevations.

SPC Mesoscale Discussion 1732 highlights the setup: surface temperatures soaring above 110°F combined with 50s°F dewpoints are fueling 1500-2000 J/kg DCAPE. This dry, hot boundary layer sets the stage for strong evaporative cooling beneath storm downdrafts, potentially generating embedded downbursts with gusts of 65-80 mph—a few could exceed 75 mph.

The MCS's cold pool will interact with this volatile airmass through late afternoon and evening (valid until around 10:45 PM MST). One or more haboobs—wall-like dust storms—are possible, slashing visibility and adding hazards for drivers.

SPC estimates a 60% chance of a mesoscale discussion watch, signaling growing confidence in severe potential. Affected areas include portions of central Arizona, from near Prescott southward.

Stay vigilant if you're in the path. Monitor radar and local NWS updates from offices like FGZ (Flagstaff) and PSR (Phoenix).

Preparedness Tips:

• Secure outdoor items like patio furniture and trash cans.
• Avoid travel if haboobs form—pull over safely if visibility drops.
• Prepare for power outages from downed lines.
• Have a severe weather plan ready.

Check SPC's MD graphic for the latest.