Right now
The most recent data we hold from HEAT GOV arrived 64 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 19 September 2026 at 17:00 UTC. It is kept here as a record.
It is the 55th strongest of the 63 detections recorded within 20 km of this point since 9 March 2026. The last comparable one was on 2 July 2026.
What the source measured
HEAT GOV reported: * WHAT...Heat index values in excess of 105 degrees expected. * WHERE...Portions of central, east central, north central, southwest, and west central Mississippi. * WHEN...From noon today to 8 PM CDT this evening. * IMPACTS...Hot temperatures and high humidity may cause heat related illnesses.
Urban PEI: 73,679 within a heuristic 50 km radius; not unique people.
Nearby, since 9 March 2026
- June 22, 2026 · score 39 · 13.8 km
- June 18, 2026 · score 46 · 19.3 km
- June 2, 2026 · score 34 · 19.3 km
How we know
One source: HEAT GOV. Not yet confirmed by a second, independent source.
Our own score for this event is 32 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) | 32 / 100 |
| Legacy data-support index | 0.70/1 |
| Coordinates | 32.6853, -89.9051 |
| Nearest City | Madison (32 km) |
| Urban exposure index (PEI) | 73.7K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-09-19T17:00:00.000Z |
| 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: 2026-09-19T17:00:00.000Z.
First archived: 2026-09-19T09:10:50.502Z. Material modification: not recorded.
Retained revisions are prospective; earlier versions may be unavailable. No revision entry does not prove that a record never changed.
Score Breakdown
Technical Details
| Event | Heat Advisory |
| Urgency | Expected |
| Certainty | Likely |
| Onset | 2026-09-19T12:00:00-05:00 |
| Expires | 2026-09-19T12:00:00-05:00 |
| AreaDesc | Grenada; Carroll; Montgomery; Humphreys; Holmes; Attala; Issaquena; Sharkey; Yazoo; Madison; Leake; Warren; Hinds; Rankin; Scott; Claiborne; Copiah; Simpson; Smith; Jasper; Clarke |
| SenderName | NWS Jackson MS |
| ZonesUsedForCentroid | 11 |
| ZoneCount | 21 |
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.
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