Severe Thunderstorm Warning for Northwestern Marion County, IL

Source: NOAA · Northwestern Marion County, Illinois

If you are in immediate danger, call emergency services now.

For real-time, official alerts and instructions for your exact location, check weather.gov (US), weather.gc.ca (Canada), the Met Office (UK), or the Bureau of Meteorology (Australia) as applicable. This article is a data summary, not a substitute for the issuing agency's live warning.

Areazine synthesizes this NWS weather alert directly from NOAA's official public data feed. See our methodology for full source attribution and refresh cadence.

NWS St Louis MO has issued a Severe Thunderstorm Warning for northwestern Marion County in south central Illinois until 4:15 PM CDT.

What this NWS weather alert tells you, and what most readers miss

This notice was issued by NOAA on May 24, 2026 and geographically references Northwestern Marion County, Illinois. Its severity classification of "high" signals how the issuing agency weighs the risk of harm if no action is taken - "critical" and "high" tier alerts typically carry direct consumer actions, while "medium" and "low" tend toward informational guidance or monitoring advisories. The category it belongs to - Weather Alerts - determines the warning protocol behind it, which shapes what protective action (seeking shelter, following evacuation orders if issued, monitoring official updates) is recommended and which agency holds authority to issue or cancel it.

Most readers skim a notice like this, check whether they are personally affected, and move on. The more useful lens is to read it as a data point about the issuing system: how quickly NOAA detected the hazard, how precise the geographic or product-identifier scope is, and whether similar notices have clustered in the same category or region in the last 90 days. Cluster patterns frequently precede a broader regulatory action, a single localized NWS weather alert is isolated; three of them within a quarter often indicate a supply-chain, infrastructure, or seasonal driver that will keep producing notices until something structural changes.

For decision-making, Areazine pairs each alert with the original agency URL, the full agency name, and a timestamp so you can verify the notice against the primary source before acting on it. Tags on this item (weather, alert, Severe Thunderstorm Warning, Marion County) map to related alerts in the same area of risk - browsing them together gives a clearer picture than any single notice alone, because the shape of an ongoing issue only becomes visible across multiple sequential alerts.

Alert Details

Severe Thunderstorm Warning issued by NWS St Louis MO. Effective from 2026-05-16T15:36:00-05:00 until 2026-05-16T16:15:00-05:00. Severity: Severe. Certainty: Observed. Urgency: Immediate.

Affected Areas

Northwestern Marion County in south central Illinois. Locations impacted include Patoka and Vernon. Storm was located over Patoka, or 12 miles northwest of Salem, at 3:36 PM CDT.

What You Should Do

Seek shelter inside a well-built structure and stay away from windows. This storm is capable of producing damaging winds and large hail. Tornadoes can develop quickly from severe thunderstorms. Seek shelter immediately in an interior room on the lowest floor of a well-built structure.

Expected Conditions

At 3:36 PM CDT, a severe thunderstorm was located over Patoka moving east at 15 mph. Hazards include 60 mph wind gusts and quarter size hail (1.00 inch). Hail damage to vehicles is expected. Expect wind damage to roofs, siding, and trees.

Timeline

Alert effective May 16 at 3:36 PM CDT until May 16 at 4:15 PM CDT. Storm will be near Patoka around 3:40 PM CDT.

Original source: NOAA Official Notice ↗

All Weather Alerts →

Frequently Asked Questions

Common questions about this NWS weather alert.

What is this NWS weather alert about?
NWS St Louis MO has issued a Severe Thunderstorm Warning for northwestern Marion County in south central Illinois until 4:15 PM CDT.
Which agency issued this alert?
This alert was issued by NOAA. The original notice is available at the source link at the bottom of this article.
How severe is this alert?
This alert is classified as "high" severity. Take precautions and monitor for updates.
What area is affected?
This alert affects Northwestern Marion County, Illinois. Check with NOAA for the most current geographic scope.
Where can I find more Weather Alerts updates?
Browse the full Weather Alerts feed on Areazine at areazine.com/weather/ for the latest updates from NOAA and other agencies.