Right now
The most recent data we hold from NOAA arrived 6 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 page covers the record dated 11 August 2026. Browse recent observations in this area:
This alert expired on 11 August 2026 at 03:45 UTC. It is kept here as a record.
No stronger detection stands among the 120 recorded within 20 km of this point since 17 May 2026 — 105 others scored the same. The last comparable one was on 10 August 2026. 32 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Extreme Heat Warning issued August 10 at 7:43PM PDT until August 10 at 8:00PM PDT by NWS Las Vegas NV
Urban PEI: 15,345 within a heuristic 50 km radius; not unique people.
Nearby, since 17 May 2026
- October 12, 2026 · 0.0 km
- October 10, 2026 · 0.0 km
- September 29, 2026 · 0.0 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 34 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 v1. Rows carrying other versions were judged by different rules and are not directly comparable.
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.
Event data
| Type | Severe Weather |
| Severity | Medium |
| Calamity Score (ours) | 34 / 100 |
| Legacy data-support index | 0.80/1 |
| Coordinates | 34.0000, -111.1000 |
| Nearest city | Payson (33 km) |
| Urban exposure index (PEI) | 15.3K within 50 km |
| Impact tier | significant |
| Timestamp | 2026-08-11T02:43:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.2e07cee0d2fcb01b04f762ef8a1e29ddc5c01dfd.001.1 |
| Licence | US public domain · NOAA National Weather Service |
Physical priority index · v1. 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: noaa. Occurrence: 2026-08-11T02:43:00.000Z.
First archived: 2026-08-11T02:56:27.604Z. 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 | Extreme Heat Warning |
| Urgency | Expected |
| Certainty | Likely |
| AreaDesc | Lake Havasu and Fort Mohave; Lake Mead - AZ side; Lake Mohave - AZ side; Death Valley National Park; San Bernardino County-Upper Colorado River Valley; Northeast Clark County; Western Clark and Southern Nye County; Las Vegas Valley; Lake Mead - NV side; Lake Mohave - NV side |
| Headline | Extreme Heat Warning issued August 10 at 7:43PM PDT until August 10 at 8:00PM PDT by NWS Las Vegas NV |
| Expires | 2026-08-10T20:45:00-07:00 |
| SenderName | NWS Las Vegas NV |
| HasExactCoords | false |
Safety information
What to do in a heat wave
Three things first, then what to do before, during and after, and how to tell heat stroke. From FEMA’s Ready.gov and the US National Weather Service.
For this reportSevere Weather · United States
Never leave anyone in a car
Not a child, not an older person, not a pet, not even for a minute: a closed car heats up dangerously fast.
Ready.gov · NWSStay cool and drink
Spend the hottest hours somewhere cool, drink water regularly, avoid hard effort in the middle of the day.
Ready.govCheck on others
Older people, people living alone, the sick and small children are the most at risk. Call or visit them.
Ready.gov
Before, during, after. Here it is “after”.
Before · When heat is forecast
Find a cool place
Air-conditioned public places near you: libraries, shopping centres, cooling centres.
Keep the house cool
Shutters and curtains closed in the sun; a fan alone is not enough in great heat.
Learn the signs
Of heat exhaustion and heat stroke (see below).
Ready.gov (FEMA)
During · In the hottest hours
Light clothes
Loose, light and light-coloured.
Cool showers
Or a cool bath, to bring your temperature down.
Water and shade for animals
Pets suffer heat as we do.
Effort early or late
Not in the middle of the day.
Ready.gov (FEMA)
After · When the heat breaks
Keep drinking
Recovery takes a day or two.
Keep checking
On the people at risk around you.
Ready.gov (FEMA)
Questions people ask
How do I recognise heat stroke?
A very high body temperature, hot and dry skin, a fast pulse, confusion or fainting. Call the emergency number, move the person somewhere cool and cool them with wet cloths. Source: Ready.gov (FEMA).
And heat exhaustion?
Heavy sweating, cramps, weakness, dizziness, headache, nausea. Move somewhere cool, loosen clothes, sip water; get help if it lasts over an hour or gets worse. Source: Ready.gov (FEMA).
Is a fan enough?
Not in great heat: it moves hot air. Cool places, cool showers and water are what help. Source: Ready.gov (FEMA).
Review the area, threshold and delivery channel in your account.