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Extreme Heat and Air Quality
The primary risk for Cahokia and the surrounding St. Louis metropolitan area is the intense "Heat Dome" building across the Mississippi Valley. The National Weather Service has issued a Heat Advisory for the entire region through Monday evening.
- Temperature and Heat Index: Actual air temperatures are forecast to reach the mid-to-upper 90s, but extremely high humidity will push the "feels-like" temperature (heat index) to between 105°F and 110°F. Weather.gov
- Duration: High confidence exists that these values will persist through the afternoon and early evening hours, posing a significant risk for heat-related illnesses if precautions are not taken. AccuWeather
- Wildfire Smoke: Models also indicate that wildfire smoke from the Northwest U.S. and Canada is moving into the Midwest. This may lead to hazy skies and potentially reduced air quality for sensitive groups in Cahokia. Weather Underground
Storm and Precipitation Risks
While the heat is the dominant story, weather models are tracking a weak cold front that could trigger localized severe weather.
- Thunderstorm Potential: There is a low (10-20%) chance of scattered thunderstorms this afternoon and evening. While the coverage is expected to be sparse, any storm that develops in this high-heat environment could become pulse-severe, capable of producing localized damaging winds. Weather.gov
- Cold Front Timing: A cold front is expected to move through by Tuesday. For Cahokia, this front will likely bring a slight reprieve from the triple-digit heat indices but may serve as the trigger for more organized rain or drizzle early Tuesday morning. AccuWeather
Local Forecast Summary for Cahokia
| Condition | Today's Outlook | Risk Level |
|---|---|---|
| Heat Index | 105°F - 110°F | High |
| Severe Storms | Isolated/Scattered | Marginal |
| Air Quality | Hazy (Wildfire Smoke) | Moderate |
| Precipitation | 10-20% chance of T-storms | Low |
Residents in Cahokia are advised to stay hydrated, limit outdoor activities during the peak heating hours (2 PM – 7 PM), and check on neighbors who may not have adequate cooling.