This alert expired on 21 June 2026 at 00:30 UTC. It is kept here as a record.
It is the 3rd strongest of the 49 detections recorded within 20 km of this point since 10 March 2026. Another comparable one was recorded here earlier the same day. 2 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Flash Flood Warning issued June 20 at 5:13PM CDT until June 20 at 7:30PM CDT by NWS Birmingham AL
An estimated 480,186 people live within 50 km of this point.
Nearby, since 10 March 2026
- July 25, 2026 · score 43 · 8.4 km
- March 16, 2026 · score 43 · 11.0 km
- June 1, 2026 · score 39 · 12.6 km
How we know
Confirmed by 3 independent sources, including NOAA.
Our own score for this event is 43 out of 100, at 90 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
Computed under scoring rules v1. Rows carrying other versions were judged by different rules and are not directly comparable.
Event Data
| Type | Severe Weather |
| Severity | Medium |
| Calamity Score (ours) | 43 / 100 |
| Our confidence | 90% |
| Coordinates | 33.8082, -87.0218 |
| Nearest City | Dixiana (35 km) |
| Population Exposed | 480.2K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-06-20T22:13:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.587783994575dd5e729c6ebdb774ac5b3ee0171e.001.1 |
Score Breakdown
Technical Details
| Event | Flash Flood Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Jefferson, AL; Walker, AL |
| Headline | Flash Flood Warning issued June 20 at 5:13PM CDT until June 20 at 7:30PM CDT by NWS Birmingham AL |
| Expires | 2026-06-20T19:30:00-05:00 |
| SenderName | NWS Birmingham AL |
| HasExactCoords | true |
| Iem TypeSummary | F |
| Iem City | Graysville |
| Iem County | Jefferson |
| Iem State | AL |
| Iem Wfo | BMX |
| Iem Remark | Various reports of roads closed due to flooding across Graysville. Report of a water rescue from a home on Cherry Avenue. |
| MergedSources | [{"id":"iem_F_33.590_-86.990_1781987400000","source":"iem","severity":"low","severityValue":25,"timestamp":1781987400000,"latitude":33.59,"longitude":-86.99},{"id":"iem_F_33.620_-86.970_1781989680000","source":"iem","severity":"low","severityValue":25,"timestamp":1781989680000,"latitude":33.62,"longitude":-86.97}] |
Safety Information
During flooding: never walk, swim, or drive through floodwaters. Six inches of moving water can knock you down, and one foot of water can sweep away a vehicle. Move to higher ground if waters rise. After flooding, avoid contact with floodwater which may contain sewage, chemicals, or debris. Follow local emergency service guidance.
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.
Want to know when something happens in this area?
Calamity.live data shows a weather event with CalamityScore 43/100 (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.