Flood risk from #Hilary in SE California deserts is genuinely alarming. Widespread & possibly destructive flash flooding is possible. This has high potential to be a historic flood event in this region. See attached screenshot of @NWSPhoenix forecast discussion from this AM.#CAwx https://t.co/zgj3tG3mr4 pic.twitter.com/Oj9881gJUP

— Dr. Daniel Swain (@Weather_West) August 18, 2023