Right now
The most recent data we hold from NOAA arrived 4 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 12 June 2026 at 20:30 UTC. It is kept here as a record.
It is the 8th strongest of the 21 detections recorded within 20 km of this point since 26 April 2026. The last comparable one was on 27 May 2026.
What the source measured
NOAA reported: Flash Flood Warning issued June 12 at 12:25PM CDT until June 12 at 3:30PM CDT by NWS Fort Worth TX
An estimated 414,048 people live within 50 km of this point.
Nearby, since 26 April 2026
- May 27, 2026 · score 48 · 6.3 km
- May 10, 2026 · score 43 · 13.4 km
- May 27, 2026 · score 48 · 14.0 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 43 out of 100, at 81 % 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 | 81% |
| Coordinates | 33.4433, -96.3917 |
| Nearest City | Sherman (30 km) |
| Population Exposed | 414.0K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-06-12T17:25:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.d6c4d7c2d245678003fd6827aef36e399abfefdb.001.1 |
Score Breakdown
Technical Details
| Event | Flash Flood Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Fannin, TX; Grayson, TX |
| Headline | Flash Flood Warning issued June 12 at 12:25PM CDT until June 12 at 3:30PM CDT by NWS Fort Worth TX |
| Expires | 2026-06-12T15:30:00-05:00 |
| SenderName | NWS Fort Worth TX |
| HasExactCoords | true |
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 near Sherman?
Calamity.live data shows a weather event with CalamityScore 43/100, near Sherman (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.