Night lights (VIIRS Day/Night Band)

Data and trust

Radiance measured by the VIIRS Day/Night Band on NOAA-20 around 1:30 am.

Limits. Clouds block the view; moonlight brightens clouds and sea.

How to read it

nW/cm2/sr from 0 to about 38: brighter = more light. Compare the same place on several clear nights.

Why it matters for Koh Samui

After a storm, a town that goes dark on a clear night suggests a power cut.

Sources

• earthdata.nasa.gov

ENSO status now

ONI (NOAA CPC)

+1.80 °C, JJA 2026 (previous +1.39 °C)

RONI (NOAA CPC)

+1.36 °C, JJA 2026

Nino 3.4 weekly (NOAA CPC / OISST)

+3.0 °C anomaly, week of 16 Sep 2026 (SST 29.6 °C)