Right now
The most recent data we hold from HEAT GOV arrived 41 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 15 September 2026 at 06:30 UTC. It is kept here as a record.
It is the 24th strongest of the 41 detections recorded within 20 km of this point since 9 March 2026. The last comparable one was on 29 August 2026.
What the source measured
HEAT GOV reported: * WHAT...Heat index values up to 109. * WHERE...Coastal Galveston, Coastal Harris, and Inland Galveston Counties. * WHEN...Until 7 PM CDT Tuesday. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses.
Urban PEI: 3,151,569 within a heuristic 50 km radius; not unique people.
Nearby, since 9 March 2026
- August 29, 2026 · score 52 · 5.1 km
- August 28, 2026 · score 41 · 7.1 km
- June 20, 2026 · score 48 · 12.4 km
How we know
One source: HEAT GOV. Not yet confirmed by a second, independent source.
Our own score for this event is 46 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) | 46 / 100 |
| Legacy data-support index | 0.70/1 |
| Coordinates | 29.3994, -95.0777 |
| Nearest City | Dickinson (7 km) |
| Urban exposure index (PEI) | 3.2M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-09-14T18:18:00.000Z |
| Source | http://www.weather.gov |
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: heat_gov. Occurrence: 2026-09-14T18:18:00.000Z.
First archived: 2026-09-14T18:37:17.746Z. Material modification: not recorded.
Retained revisions are prospective; earlier versions may be unavailable. No revision entry does not prove that a record never changed.
2026-09-15T01:35:16.504Z · data_change
Index 46 → 46; severity medium → medium; version 5 → 5.
2026-09-15T01:03:32.114Z · data_change
Index 46 → 46; severity medium → medium; version 5 → 5.
2026-09-15T00:31:33.367Z · data_change
Index 46 → 46; severity medium → medium; version 5 → 5.
2026-09-14T23:46:52.036Z · data_change
Index 46 → 46; severity medium → medium; version 5 → 5.
2026-09-14T23:14:43.066Z · data_change
Index 46 → 46; severity medium → medium; version 5 → 5.
2026-09-14T22:42:32.673Z · data_change
Index 46 → 46; severity medium → medium; version 5 → 5.
2026-09-14T22:15:42.466Z · data_change
Index 46 → 46; severity medium → medium; version 5 → 5.
2026-09-14T21:43:38.562Z · data_change
Index 46 → 46; severity medium → medium; version 5 → 5.
Score Breakdown
Technical Details
| Event | Heat Advisory |
| Urgency | Expected |
| Certainty | Likely |
| Onset | 2026-09-14T13:18:00-05:00 |
| Expires | 2026-09-15T01:30:00-05:00 |
| AreaDesc | Inland Galveston; Coastal Harris; Coastal Galveston |
| SenderName | NWS Houston/Galveston TX |
| ZonesUsedForCentroid | 2 |
| ZoneCount | 3 |
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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