Right now
The most recent data we hold from HEAT GOV arrived 12 hours ago, and this point is not in it. We record detections, not passes: an absence is not proof that nothing is there.
This alert expired on 17 September 2026 at 18:30 UTC. It is kept here as a record.
What the source measured
HEAT GOV reported: * WHAT...Heat index values up to 107. * WHERE...Portions of East Arkansas, North Mississippi, Southeast Missouri, and West Tennessee. * WHEN...Until 8 PM CDT Saturday. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses.
Urban PEI: 241,343 within a heuristic 50 km radius; not unique people.
How we know
One source: HEAT GOV. Not yet confirmed by a second, independent source.
Our own score for this event is 37 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) | 37 / 100 |
| Legacy data-support index | 0.70/1 |
| Coordinates | 35.3912, -89.4730 |
| Nearest City | Ellendale (37 km) |
| Urban exposure index (PEI) | 241.3K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-09-17T06:20:00.000Z |
| 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: 2026-09-17T06:20:00.000Z.
First archived: 2026-09-17T10:40:26.785Z. 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 | 2026-09-17T01:20:00-05:00 |
| Expires | 2026-09-17T13:30:00-05:00 |
| AreaDesc | Clay; Greene; Craighead; Poinsett; Mississippi; Cross; Crittenden; St. Francis; Lee; Phillips; Dunklin; Pemiscot; DeSoto; Marshall; Benton; Tippah; Alcorn; Tishomingo; Tunica; Tate; Prentiss; Coahoma; Quitman; Panola; Lafayette; Union; Pontotoc; Lee; Itawamba; Tallahatchie; Yalobusha; Calhoun; Chickasaw; Monroe; Lake; Obion; Weakley; Henry; Dyer; Gibson; Carroll; Benton; Lauderdale; Tipton; Haywood; Crockett; Madison; Chester; Henderson; Decatur; Shelby; Fayette; Hardeman; McNairy; Hardin |
| SenderName | NWS Memphis TN |
| ZonesUsedForCentroid | 11 |
| ZoneCount | 55 |
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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