This alert expired on 12 May 2026 at 20:30 UTC. It is kept here as a record.
It is the 2nd strongest of the 6 detections recorded within 20 km of this point since 12 May 2026.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued May 12 at 3:43PM EDT until May 12 at 4:30PM EDT by NWS Melbourne FL
An estimated 407,297 people live within 50 km of this point.
Nearby, since 12 May 2026
- June 2, 2026 · score 43 · 8.4 km
- May 12, 2026 · score 43 · 13.3 km
- June 18, 2026 · score 52 · 22.5 km
How we know
Confirmed by 3 independent sources, including NOAA.
Our own score for this event is 43 out of 100, at 91 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
Event Data
| Type | Severe weather |
| Severity | medium |
| Calamity Score (ours) | 43 / 100 |
| Our confidence | 91% |
| Coordinates | 28.0258, -81.3547 |
| Nearest City | Poinciana (16 km) |
| Population Exposed | 407.3K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-05-12T19:43:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.df6e367f21f581e27de254c5dba493048dccfc66.001.1 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Osceola, FL |
| Headline | Severe Thunderstorm Warning issued May 12 at 3:43PM EDT until May 12 at 4:30PM EDT by NWS Melbourne FL |
| Expires | 2026-05-12T16:30:00-04:00 |
| SenderName | NWS Melbourne FL |
| HasExactCoords | true |
| Iem TypeSummary | H |
| Iem Magnitude | 1 |
| Iem Unit | Inch |
| Iem City | 1 NW Oviedo |
| Iem County | Seminole |
| Iem State | FL |
| Iem Wfo | MLB |
| Iem Remark | [Delayed report] Media photos and video of quarter sized (1.00 in.) hail in the Oviedo area. |
| MergedSources | [{"id":"iem_H_28.630_-81.210_1778602860000","source":"iem","severity":"low","severityValue":25,"timestamp":1778602860000,"latitude":28.63,"longitude":-81.21},{"id":"iem_H_28.680_-81.220_1778601660000","source":"iem","severity":"low","severityValue":25,"timestamp":1778601660000,"latitude":28.68,"longitude":-81.22}] |
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 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 43/100, near Poinciana (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 188 scientific monitoring sources.