Right now
The most recent data we hold from NOAA arrived 10 minutes ago, and this point is not in it. We record detections, not passes: an absence is not proof that nothing is there.
Nothing else has been detected within 20 km in the last 24 hours.
This alert expired on 21 September 2026 at 01:30 UTC. It is kept here as a record.
It is the 36th strongest of the 67 detections recorded within 20 km of this point since 16 March 2026. Another comparable one was recorded here earlier the same day. 9 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued September 20 at 8:20PM CDT until September 20 at 8:30PM CDT by NWS Tallahassee FL
Urban PEI: 90,901 within a heuristic 50 km radius; not unique people.
Nearby, since 16 March 2026
- June 1, 2026 · score 43 · 13.6 km
- July 12, 2026 · score 43 · 13.9 km
- September 20, 2026 · score 32 · 15.3 km
How we know
2 recorded sources include NOAA; independence is not established by this count.
Our own score for this event is 32 out of 100.
This is our versioned heuristic index, not source severity or a calibrated probability. Urban PEI does not count unique people.
Computed under scoring rules v5. Rows carrying other versions were judged by different rules and are not directly comparable.
Event Data
| Type | Severe Weather |
| Severity | Medium |
| Calamity Score (ours) | 32 / 100 |
| Legacy data-support index | 0.86/1 |
| Coordinates | 30.3735, -86.0006 |
| Nearest City | Santa Rosa Beach (22 km) |
| Urban exposure index (PEI) | 90.9K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-09-21T01:20:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.7affad8a0d88cb290e0fb09b99ba4a2ce7066562.001.1 |
Physical priority index · v5. Heuristic priority, not calibrated probability, predictive accuracy or damage. The legacy data-support index combines assigned source support and field availability. Urban PEI is distance-weighted and does not count unique people; zero does not establish that nobody is present. Model cards.
Source and revision timeline
Source: noaa. Occurrence: 2026-09-21T01:20:00.000Z.
First archived: 2026-09-21T01:24:48.825Z. Material modification: not recorded.
Retained revisions are prospective; earlier versions may be unavailable. No revision entry does not prove that a record never changed.
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Walton, FL; Bay, FL |
| Headline | Severe Thunderstorm Warning issued September 20 at 8:20PM CDT until September 20 at 8:30PM CDT by NWS Tallahassee FL |
| Expires | 2026-09-20T20:30:00-05:00 |
| SenderName | NWS Tallahassee FL |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.7affad8a0d88cb290e0fb09b99ba4a2ce7066562.001.1","noaa_urn:oid:2.49.0.1.840.0.08856c897053e291d94d63c6e6f0915a8bd84bbb.001.1"] |
| Iem TypeSummary | G |
| Iem Magnitude | 40 |
| Iem Unit | MPH |
| Iem City | 1 N De Funiak Springs |
| Iem County | Walton |
| Iem State | FL |
| Iem Wfo | TAE |
| Iem Remark | Walton High School Weatherstem gusted to 40 mph. |
| MergedSources | [{"id":"iem_G_30.740_-86.120_1789950840000","source":"iem","severity":"low","severityValue":25,"timestamp":1789950840000,"latitude":30.74,"longitude":-86.12}] |
Safety Information
Always follow official guidance from your local emergency management agency. This platform provides scientific monitoring data and is not a substitute for official warnings. If you are in immediate danger, contact your local emergency number.
Series begins 8 March 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.
Review the area, threshold and delivery channel in your account.
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