St. Louis, MO
Summary: The National Weather Service in St. Louis has issued a Moderate Risk (Level 4) for severe thunderstorms on April 27, 2026, with threats including baseball-sized hail, damaging winds, and strong tornadoes between 2-10 PM.
This briefing from the National Weather Service in St. Louis, dated April 27, 2026, outlines a significant severe weather event. The region is under a Moderate Risk (Level 4) for severe thunderstorms expected to develop between 2:00 PM and 10:00 PM. Hazards include baseball-sized hail, damaging winds, and tornadoes, with the potential for strong (EF2+) tornadoes. The NWS highlights uncertainty regarding the exact timing and location of the highest threat due to morning storm remnants, but notes that the most likely areas affected are east-central and southeast Missouri and southwest Illinois.
Document outline
1. Severe Weather Outlook: Moderate Risk (Level 4) 2. Timing of Greatest Severe Risk (2-10 PM) 3. Forecaster Confidence: Storm Evolution and Hazards 4. Uncertainty Factors: Morning Outflow Boundaries and Sunshine 5. Severe Threats Matrix: Tornadoes, Hail, and Damaging Winds