Yup, when the Flash Flood Warnings have the "considerable" threat or higher tag included, it then triggers the Wireless Emergency Alerts (WEA) and sends to smartphones.
That is just one warning. I will add that several warnings have verified with good lead times.
https://mesonet.agron.iastate.edu/cow/?syear=2026&smonth=9&sday=1&shour=12&eyear=2026&emonth=9&eday=2&ehour=12&wfo=PHI&hail=1.00&lsrbuffer=15&warnbuffer=0.01&wind=58&wtype[]=TO&wtype[]=SV<ype[]=T<ype[]=D<ype[]=H<ype[]=G