St. Louis region upgraded to a level 4 out of 5 threat for severe weather - STLPR

1. St. Louis region upgraded to a level 4 out of 5 threat for severe weather  STLPR
2. LIVE RADAR | Tornado warning issued for St. Louis, numerous other counties on Monday  KSDK
3. First Alert Weather Day: Severe storms possible this evening  WBAY
4. Multiday severe storm outbreak builds toward dangerous peak Monday  CNN
5. Millions under threat of strong tornadoes Monday  The Washington Post