Full Breakdown
St. Louis Region Faces Moderate Risk of Severe Weather on April 27, 2026
4/28/2026, 9:19:37 AM
Elevated Storm Threat
The Storm Prediction Center (SPC) placed the entire St. Louis viewing area under a Level 4 (moderate) risk—the second-highest category on its five-point scale. An 80 % probability of storms was forecast, with the primary hazards identified as damaging winds (60-80 mph), large hail (up to baseball size), and tornadoes that could reach EF-3 intensity. The system was expected to move from west to east across the region between 4 p.m. and 9 p.m., with a secondary wave arriving after 5 p.m.
Forecast Upgrade and Context
At 10 a.m., the SPC upgraded the outlook from “enhanced” to “moderate,” citing a deep-layer wind shear and a highly unstable air mass. Meteorologists noted that the atmosphere would support discrete supercells capable of producing strong tornadoes, a scenario described as “not your run-of-the-mill severe weather event by any means.” The upgrade triggered a statewide tornado watch lasting until 9 p.m.
Timeline of Warnings
- 8:30 a.m.: First tornado warning issued for St. Louis County.
- 12:27 p.m.: Tornado warning expanded to Madison, St. Clair, and surrounding counties.
- 1 p.m.: SPC issued a tornado watch covering Missouri and Illinois counties, effective until 9 p.m.
- 3–7 p.m.: Forecasted peak period for severe storms.
- 7:45 p.m.: Ameren reported >43,000 customers without power as storms intensified.
Hazard Metrics
- Risk level: 4 / 5 (moderate).
- Storm probability: 80 %.
- Wind gusts: 60-80 mph (some reports up to 75-80 mph).
- Hail: up to baseball-size (?2-3 in).
- Tornado potential: EF-3+ (strong to intense).
- Power outages: >43 000 (Missouri & Illinois).
- School dismissals: at least 30 districts closed early or canceled after-school activities.
Community Impact
St. Louis Public Schools dismissed students two hours early; districts such as Parkway, Kirkwood, and Affton followed suit. The St. Louis Zoo closed at 2 p.m., and City Hall reduced operations to essential services. Roadways on I-70 experienced flooding, prompting temporary closures. Emergency responders performed multiple water rescues in the metro-east, while the Missouri State Highway Patrol reported downed trees and power lines in Howard and Callaway counties.
Official Statements & Responses
National Weather Service forecasters emphasized that “the possibility of damaging wind, very large hail and a few strong tornadoes… remains a very real concern.” SPC meteorologist Evan Bentley warned of “multiple supercells capable of all hazards, including tornadoes, large hail and wind gusts.” Ameren’s Ben Lynch said the utility is “trying to understand where those outages may be” and will prioritize rapid restoration. Local officials urged residents to have multiple warning channels and to seek interior rooms or basements if tornado warnings are issued.
Conflicting Reports & Gaps
Some counties were listed under both tornado watches and warnings, creating overlapping advisories. While several sources reported hail up to baseball size, others mentioned only 2-inch hail, leaving the exact maximum size uncertain. Damage assessments were still pending; no confirmed tornado-related injuries or structural losses had been reported at the time of writing.
Verbatim Quotes
- “If tornadoes can form, they could be on the stronger side for sure,” — Christine Wielgos, Paducah, KY meteorologist
- “make sure you have a plan to go to the interior room or basement of your home.” — Brian Hays, St. Louis meteorologist
- “The possibility of damaging wind, very large hail and a few strong tornadoes on Monday afternoon and evening remains a very real concern,” — Garry Frank, 5 On Your Side meteorologist
- “What we're trying to do is understand where those outages may be,” — Ben Lynch, Ameren Missouri director of Distribution operations
- “EF2 intensity tornadoes and stronger are possible, Fuchs said, along with straight-line winds and large hail.” — Mark Fuchs, senior service hydrologist, St. Louis NWS office
Outlook
The SPC indicated that the severe threat will shift southeastward Tuesday, with continued chances for strong tornadoes and heavy rain across parts of Missouri, Illinois, and Kentucky. Power crews expect to restore most outages by Wednesday, while schools and municipal services remain on standby for any lingering hazards. Residents are advised to maintain active alert systems through the weekend.
