Right now
The most recent data we hold from HEAT GOV arrived 23 minutes ago, and this point is in it.
Nothing else has been detected within 20 km in the last 24 hours.
This alert is in force until 8 September 2026, 23:00 UTC.
It is the 2nd strongest of the 14 detections recorded within 20 km of this point since 11 April 2026. The last comparable one was on 18 May 2026.
What the source measured
HEAT GOV reported: * WHAT...High temperatures 97 to 102 and low temperatures 65 to 75 expected, with widespread Moderate HeatRisk and areas of Major HeatRisk. * WHERE...The central and southern Sacramento Valley, northern San Joaquin Valley, Delta and Carquinez Strait, Foothills, and portions of the Coast Range. ...
An estimated 1,969,090 people live within 50 km of this point.
Nearby, since 11 April 2026
- April 22, 2026 · score 52 · 17.9 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, at 69 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
Computed under scoring rules v4. 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 |
| Our confidence | 69% |
| Coordinates | 38.5898, -121.4742 |
| Nearest City | Sacramento (2 km) |
| Population Exposed | 2.0M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-09-09T17:00:00.000Z |
| Source | http://www.weather.gov |
Score Breakdown
Technical Details
| Event | Heat Advisory |
| Urgency | Expected |
| Certainty | Likely |
| Onset | 2026-09-09T10:00:00-07:00 |
| Expires | 2026-09-08T16:00:00-07:00 |
| AreaDesc | Sierra Nevada of Tehama-Butte-Plumas Counties Between 1000-3000 ft; Northern Motherlode Between 1000-3000 ft; Central Motherlode Between 1000-3000 ft; Southern Motherlode Between 1000-3000 ft; Northern Sacramento Valley in Tehama County; Central Glenn County Including Interstate 5; Eastern Glenn County; Butte County Below 1000 ft; Central Colusa County Including Interstate 5; Eastern Colusa County; Sutter and Yuba Counties Below 1000 ft; Capay Hills of Yolo County and Vaca Hills of Solano County; Western Yolo County Including Capay Valley and Interstate 505; Central Yolo and Northeast Solano Counties Including Woodland and Davis; Sacramento Metro and Western El Dorado and Amador Counties; Central Solano County Including Fairfield and Vacaville; Southwestern Solano County Including Vallejo; Sacramento County Delta; San Joaquin County Delta; Central San Joaquin County Including Stockton Metro; Tracy Triangle Below 1000 ft; Northeastern San Joaquin Valley Below 1000 ft; Eastern Diablo Range Above 1000 ft; Western Stanislaus County Below 1000 ft Including Interstate 5; Central Stanislaus County Including Modesto Metro |
| SenderName | NWS Sacramento CA |
| ZonesUsedForCentroid | 9 |
| ZoneCount | 25 |
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.
Want to know when something happens near Sacramento?
Calamity.live data shows a weather event with CalamityScore 46/100, near Sacramento (United States), based on data from heat_gov. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.