This alert expired on 16 March 2026 at 01:00 UTC. It is kept here as a record.
It is the 7th strongest of the 551 detections recorded within 20 km of this point since 10 March 2026. Another comparable one was recorded here earlier the same day. 3 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Tornado Watch issued March 15 at 1:33PM CDT until March 15 at 8:00PM CDT by NWS St Louis MO
An estimated 450,012 people live within 50 km of this point.
Nearby, since 10 March 2026
- August 13, 2026 · score 43 · 0.0 km
- August 12, 2026 · score 43 · 0.0 km
- August 9, 2026 · score 43 · 0.0 km
How we know
Confirmed by 2 independent sources, including NOAA.
Our own score for this event is 55 out of 100, at 82 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
Event Data
| Type | Severe weather |
| Severity | high |
| Calamity Score (ours) | 55 / 100 |
| Our confidence | 82% |
| Coordinates | 40.6000, -89.4000 |
| Nearest City | Morton (5 km) |
| Population Exposed | 450.0K within 50 km |
| Impact Tier | severe |
| Timestamp | 2026-03-15T18:33:00.000Z |
| Source | https://api.weather.gov/alerts/urn-oid-2_49_0_1_840_0_b2202b3fb6d83990019519fb134d3116034da958_001_1 |
Score Breakdown
Technical Details
| Event | Tornado Watch |
| Urgency | Future |
| Certainty | Possible |
| AreaDesc | Bond, IL; Calhoun, IL; Clinton, IL; Fayette, IL; Greene, IL; Jersey, IL; Macoupin, IL; Madison, IL; Marion, IL; Monroe, IL; Montgomery, IL; Pike, IL; Randolph, IL; St. Clair, IL; Washington, IL; Audrain, MO; Callaway, MO; Cole, MO; Crawford, MO; Franklin, MO; Gasconade, MO; Iron, MO; Jefferson, MO; Lincoln, MO; Madison, MO; Montgomery, MO; Osage, MO; Pike, MO; Ralls, MO; Reynolds, MO; St. Charles, MO; Ste. Genevieve, MO; St. Francois, MO; St. Louis, MO; Warren, MO; Washington, MO; St. Louis City, MO |
| Headline | Tornado Watch issued March 15 at 1:33PM CDT until March 15 at 8:00PM CDT by NWS St Louis MO |
| Expires | 2026-03-15T20:00:00-05:00 |
| SenderName | NWS St Louis MO |
| HasExactCoords | false |
| Iem TypeSummary | N |
| Iem Magnitude | 46 |
| Iem Unit | MPH |
| Iem City | Central Illinois Airpor |
| Iem County | McLean |
| Iem State | IL |
| Iem Wfo | ILX |
| Iem Remark | AWOS station KBMI Bloomington Arpt. Sustained at 35 mph. |
| MergedSources | [{"id":"iem_N_40.480_-88.910_1773597360000","source":"iem","severity":"low","severityValue":25,"timestamp":1773597360000,"latitude":40.48,"longitude":-88.91}] |
Safety Information
If a tornado warning is issued: go to a basement or an interior room on the lowest floor, away from windows. A vehicle and a mobile home are not shelter. Cover your head and neck. Wait for the official all-clear before going outside, and watch for downed power lines and gas leaks afterwards.
Series begins 10 February 2026. Comparisons refer to that period only. Collection gap: 14-26 August 2026.
This data is aggregated algorithmically from scientific sources. Not a replacement for official emergency warnings.
Calamity.live data shows a weather event with CalamityScore 55/100, near Morton (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 188 scientific monitoring sources.