Iris Case library

Evidence from a changing planet

Explore completed investigations that turn decades of satellite and climate data into clear, statistically defensible findings.

Start an investigation

DISASTER EVIDENCE / NEW INVESTIGATIONS

From a past event to a better question.

Trace sourced event evidence, inspect NASA precipitation context and explore a current point outlook.

2024 · Historical investigation

Nepal floods · September 2024

Investigate rainfall context and the documented warning timeline around the September 2024 floods. This point is not a measurement of the whole Bagmati basin.

Open investigation →2025 · Historical investigation

Cyclone Ditwah · Sri Lanka 2025

Examine rainfall context around Cyclone Ditwah and separate historical observations, archived reports and today's rainfall forecasts. Colombo is one sample point, not the cyclone's footprint.

Open investigation →

Featured investigationLos Angeles County

IR–04221 years of evidence

Is Los Angeles getting meaningfully hotter?

The signal is clear: near-surface temperatures rose beyond the range of normal year-to-year variation, with the strongest acceleration after 2016.

Detected trend+0.42 °Cper decade

Confidence99.86%p = 0.0014

Open full investigation

6 Published cases

Investigation library

2005–2025

IR–042Extreme heat

Two decades of urban warming

Separating long-term warming from seasonal variability across one of North America’s largest urban regions.

Los Angeles County, USA

Finding+0.42 °C / decade

Confidence99.86%

2001–2024

IR–038Drought

The signature of a historic drought

Tracing soil moisture decline through the 2012–2016 drought and testing whether conditions recovered.

Central Valley, USA

Finding−18.7 mm / decade

Confidence98.2%

2003–2024

IR–031Vegetation

Forest resilience under pressure

Examining persistent vegetation stress and the growing duration of dry-season anomalies.

Amazon Basin, Brazil

Finding−0.08 NDVI / decade

Confidence95.4%

2000–2024

IR–027Extreme heat

Arctic amplification in focus

Measuring a rapid high-latitude warming signal and its relationship to sea-ice season length.

Svalbard, Norway

Finding+1.12 °C / decade

Confidence99.97%

2002–2023

IR–019Vegetation

A greening Sahel

Mapping where vegetation recovery is persistent and where rainfall variability still dominates.

Sahel Region, Africa

Finding+0.05 NDVI / decade

Confidence94.8%

2000–2024

IR–014Drought

Monsoon variability

Testing whether recent rainfall extremes represent a trend or remain within natural variability.

Western Ghats, India

FindingInconclusive

Confidence72.1%