MACOUPIN COUNTY, IL — Residents of Macoupin County are under an urgent weather alert this morning as a powerful line of severe thunderstorms sweeps through the region. The National Weather Service (NWS) has issued a Severe Thunderstorm Warning effective until 12:15 p.m. on Thursday, December 18, 2025.
Local meteorologists and emergency management officials are warning that these fast-moving storms carry the potential for destructive wind gusts and the sudden “spin-up” of isolated tornadoes.
Storm Characteristics and Timing
The storm system was first detected on radar moving through the area at a brisk 35 mph. While the primary front of the storm is bringing heavy rainfall and frequent lightning, the most significant threat remains the atmospheric instability capable of producing damaging straight-line winds.
The NWS has highlighted the following primary hazards for Macoupin County:
- Damaging Winds: Wind gusts of up to 60 mph are expected. Winds of this magnitude are capable of snapping tree limbs, toppling power lines, and causing structural damage to roofs and outbuildings.
- Tornado Threat: While the event is primarily characterized as a severe thunderstorm, officials emphasized that an isolated tornado remains possible. These “spin-up” tornadoes can occur with very little warning within a severe thunderstorm line.
- Heavy Precipitation: Torrential rain accompanying the storms may lead to localized ponding on roadways and significantly reduced visibility for midday commuters.
Safety Recommendations: Seek Shelter Immediately
Emergency officials are urging all residents within the warning area to take immediate action. The “Get In, Get Down, Cover Up” protocol is currently in effect for those in the path of the storm.
If you are in Macoupin County:
- Seek Shelter: Move to a sturdy, well-built structure immediately.
- Lowest Floor: Go to the lowest floor possible, such as a basement or storm cellar.
- Interior Room: If a basement is not available, move to an interior room (like a closet or bathroom) away from windows and exterior walls.
- Protect Yourself: Use blankets, pillows, or helmets to protect your head from potential flying debris.
- Avoid Windows: Stay away from glass doors and windows, as high winds can easily shatter them.
For those currently in mobile homes or vehicles, emergency managers stress that these are not safe during 60 mph wind gusts or tornadic activity. Residents in mobile homes should relocate to the nearest sturdy building if time permits.
Impact on Infrastructure and Travel
The timing of the warning, spanning the lunch hour, poses a particular risk to travelers. High-profile vehicles, such as semi-trucks and SUVs, are especially vulnerable to 60 mph gusts on open stretches of highway.
Local utility companies are on standby as the high winds increase the likelihood of power outages across the county. Residents are encouraged to charge mobile devices and keep a battery-powered weather radio handy to receive updates if cellular service or power is interrupted.
Current Conditions and Forecast
As of midday, current conditions in Macoupin County show a temperature of 8°C with a feels-like temperature of 4°C. Humidity remains high at 85%, and the chance of precipitation is near 82% as the main line of the storm passes.
Looking ahead, the daily forecast for Thursday, December 18, predicts a high of 13°C before a sharp cold front drops temperatures to a low of -7°C tonight. As the storm clears, southwest winds are expected to remain breezy at around 22 mph.
Stay Informed
The situation remains fluid. Residents are advised to monitor local news stations, such as WAND-TV, and official National Weather Service social media channels for real-time updates. The warning is currently set to expire at 12:15 p.m., but extensions or additional warnings may be issued if the storm intensity persists as it moves east.