Observed thermal detection
Archived · Heat measured near Negrelos, Santo Tirso
Archived after 7 days without detections. No satellite detection does not mean an area is safe. Cloud, sensor timing and heat below a sensor’s threshold can hide activity.
Satellite
Where the measurements are
Heat marks show satellite measurements. Orbit tracks are modelled; glow sizes and place-label positions are display context.
What each mark means
Footprint at this scaleVIIRS (NASA) 375 mMeteosat (EUMETSAT) about 1–3 km per cell · not drawn
- VIIRS (NASA)375 m
Measured positions. Drawn at true footprint scale, brightest layer.
- Meteosat (EUMETSAT)about 1–3 km per cell—
Measures radiated power, which is what sizes the glow. Its individual pixel positions are not stored, so no Meteosat footprint is drawn — inferring one from the sharper layer would put a detection pixel on ground nobody measured.
- True geographic scale, corrected for latitude. Frame is about 48 km across.
- The glow means “an event, roughly here”. Its area follows the measured power and its radius is capped, because an uncapped one would assert a burnt extent nobody measured. The number carries the magnitude.
- Grey marks detections shown as history, including those on quiet or archived events. It does not establish that a later satellite pass measured no activity.
- Coastline, lakes and borders come from a generalised map with about 1,7 km between vertices, so treat every line as the shape of the geography and not as a surveyed boundary. It is drawn under the data and never over it.
- Place names sit at their own coordinates from an offline index of populated places. They say what is near the measurements — not that any named place is burning, and not how far the heat reaches.
- This event is quiet or archived, so its detections are drawn in history grey — . This status does not rule out recent heat detections or mean the activity is over.
Archived
Archived · play back
Only authorities can declare the end of a fire.
Viewing is free; saving and playback require a Pass, with no alerts for archived events.
Official
Official source record
Official information is shown separately and takes precedence over satellite interpretation.
Official feeds are currently integrated for Portugal only.
- ANEPC — Autoridade Nacional de Emergência e Proteção Civil
Negrelos, Negrelos (São Tomé), Santo Tirso
Authority status: Despacho de 1º Alerta
An authority link is not a fire classification.
1 Oct 2026, 13:30 UTC- Source start time
- 1 Oct 2026, 13:13 UTC
- Personnel
- 5
- Vehicles
- 1
- Aircraft
- 0
Satellite
Current facts
No satellite detection does not mean an area is safe. Cloud, sensor timing and heat below a sensor’s threshold can hide activity.
MTG · VIIRS · Official
Verification ladder
- ConfirmedNot yet observed
Two independent satellite looks recorded the same heat; one power reading or one VIIRS detection alone does not establish this step. Confirming sensors: unknown in the public record.
- QuantifiedObserved
The heat here has a number on it — radiated power, in megawatts — and the number is what lets one reading be compared with another from the same time of day, day by day. Between measurements it says nothing. Measured by: VIIRS (NASA).
- Linked to an official sourceObserved
An official update has been matched to this event. Official information outranks everything above it. ANEPC — Autoridade Nacional de Emergência e Proteção Civil
peak 1.1 MW · VIIRS · · 1 Oct 2026, 13:42 UTC
What each sensor measured
Meteosat looks every ten minutes; VIIRS passes a few times a day. The contrast is the point — between sharp passes there is no new sharp knowledge, only the ten-minute layer.
VIIRS · Meteosat
Observation history
Day and night observations stay labelled. REYKR does not compare unlike times of day.
Measurement record
Measured in a single observation, on 1 Oct 2026, 13:42. Satellite readings in the 72 hours shown: 1, from VIIRS (NASA). Highest single reading in that window: 1.1 MW, VIIRS (NASA) — 1 Oct 2026, 13:42, .
This is a record of what satellites have measured so far, not a statement that the activity has ended. Only an official source can say that, and heat can return to ground that has gone quiet.
Observations from the 72 hours up to 1 Oct 2026, 13:42 UTC.
- 1 Oct 2026, 13:42VIIRS1 detections · average 1.1 MW · peak 1.1 MWDay
Nearby
Other detections nearby
Other satellite-observed events within 100 km, nearest first — up to six shown.
Norte
1.6 km away
Archived after 7 days without detectionsView event facts →Norte
5.9 km away
Archived after 7 days without detectionsView event facts →Norte
6.5 km away
Archived after 7 days without detectionsView event facts →Norte
8.6 km away
Archived after 7 days without detectionsView event facts →Norte
8.9 km away
Archived after 7 days without detectionsView event facts →Norte
9.6 km away
Archived after 7 days without detectionsView event facts →
Questions about these readings
What has been observed near Negrelos, Santo Tirso?
Archived after 7 days without detections. No satellite detection does not mean an area is safe. Cloud, sensor timing and heat below a sensor’s threshold can hide activity.
When was the last measurement near Negrelos, Santo Tirso?
1 Oct 2026, 13:42 UTC
How current is the last measurement near Negrelos, Santo Tirso?
No signals: safe?
No. No detection is not proof of safety: cloud, missed passes, sub-threshold heat or failed reads leave activity unknown.
Missing or misplaced?
Outside coverage or without usable observations: unknown. Meteosat floor about 12 MW; VIIRS 375 m; Meteosat about 1–3 km. Approximate areas, not fire boundaries.
Data age?
Meteosat: every 10 min; median publication lag about 17 min, no deadline. VIIRS: usually 1–3 h after a pass. ANEPC: at least 600 s (10 min) between polls; no publication guarantee. Age per reading.
Sources?
Official above satellite. ANEPC: Portugal only. Meteosat (EUMETSAT); VIIRS (NASA): Suomi-NPP, NOAA-20, NOAA-21. Suomi-NPP retirement planned 1 November 2026.