Right now
The most recent data we hold from NOAA arrived 15 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 27 May 2026 at 17:30 UTC. It is kept here as a record.
No stronger detection stands among the 18 recorded within 20 km of this point since 15 March 2026 — 8 others scored the same. 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 May 27 at 11:35AM CDT until May 27 at 12:30PM CDT by NWS Fort Worth TX
An estimated 1,888,432 people live within 50 km of this point.
Nearby, since 15 March 2026
- May 27, 2026 · score 52 · 0.0 km
- May 10, 2026 · score 52 · 10.2 km
- June 14, 2026 · score 52 · 12.8 km
How we know
Confirmed by 5 independent sources, including NOAA.
Our own score for this event is 52 out of 100, at 89 % 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) | 52 / 100 |
| Our confidence | 89% |
| Coordinates | 33.1656, -96.4715 |
| Nearest City | McKinney (14 km) |
| Population Exposed | 1.9M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-05-27T16:35:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Flash Flood Warning_noaa_urn:oid:2.49.0.1.840.0.6529ab1cf548db1591a2144da7ecf9a7 |
Score Breakdown
Technical Details
| Event | Flash Flood Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Dallas, TX; Kaufman, TX; Rockwall, TX; Fannin, TX; Grayson, TX; Collin, TX |
| Headline | Flash Flood Warning issued May 27 at 11:35AM CDT until May 27 at 12:30PM CDT by NWS Fort Worth TX |
| Expires | 2026-05-27T12:30:00-05:00 |
| SenderName | NWS Fort Worth TX |
| HasExactCoords | true |
| MergedCount | 3 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.6529ab1cf548db1591a2144da7ecf9a7b36cee41.001.1","noaa_urn:oid:2.49.0.1.840.0.48b5bd83d0ea43247e4514c2d0ab1403f4da71bf.001.1","noaa_urn:oid:2.49.0.1.840.0.64708ab6ea98ceddb7e6b9f1e44f29801600302c.001.1"] |
| Iem TypeSummary | F |
| Iem City | 1 E Sachse |
| Iem County | Dallas |
| Iem State | TX |
| Iem Wfo | FWD |
| Iem Remark | Emergency Manager reported road closure of Sachse Rd at Country Club Rd due to high water. |
| MergedSources | [{"id":"iem_F_32.730_-96.480_1779894900000","source":"iem","severity":"low","severityValue":25,"timestamp":1779894900000,"latitude":32.73,"longitude":-96.48},{"id":"iem_F_33.380_-96.350_1779898500000","source":"iem","severity":"low","severityValue":25,"timestamp":1779898500000,"latitude":33.38,"longitude":-96.35},{"id":"iem_F_32.820_-96.470_1779897600000","source":"iem","severity":"low","severityValue":25,"timestamp":1779897600000,"latitude":32.82,"longitude":-96.47},{"id":"iem_F_32.980_-96.560_1779900480000","source":"iem","severity":"low","severityValue":25,"timestamp":1779900480000,"latitude":32.98,"longitude":-96.56}] |
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.
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