Select drought indices and timescales to composite. Median or mean is computed per pixel across selected layers.
Index
Time
Weight
Ref Period
Method
Overlays ⓘ▼
Recent weeks
Latest
All dates
Opacity
0.55
State
County
Tribal
Watershed
Zoom to Location ⓘ▼
Basemap & Theme ⓘ▼
Theme
Information ⓘ▼
Institutional Partners
Regional Partners
Map Overlays
Loading data…
Streamflow Percentile
Rolling 30-yr Climatology
0–2%
2–5%
5–10%
10–20%
20–30%
30–70%
70–80%
80–90%
90–95%
95–98%
98–100%
Standardized Soil Moisture Anomaly
Montana Mesonet
Exceptionally Dry
Extremely Dry
Severely Dry
Moderately Dry
Abnormally Dry
Near Normal
Abnormally Wet
Moderately Wet
Severely Wet
Extremely Wet
Exceptionally Wet
U.S. Drought Monitor
D0 — Abnormally Dry
D1 — Moderate Drought
D2 — Severe Drought
D3 — Extreme Drought
D4 — Exceptional Drought
Vegetation Health Index
VIIRS-NOAA20 · 500 m
0–6 · Severe stress
6–12
12–24
24–36
36–48
48–60
60–72
72–84
84–96
96–100 · Healthy
Snow/ice
Desert / missing
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Tips & Shortcuts
Share your view. Click Share in the toolbar to generate a link that captures your current variable, timescale, reference period, and map position. Anyone opening the link will see exactly what you see.
Save a view. Click Share to generate a link that captures your current settings. Bookmark or save that link to return to the exact same view later.
Export the map. Click Export to download a high-resolution PNG of the current map view, complete with title, legend, and attribution.
Point query. With the point query tool active (on by default), click anywhere on the map to see the exact value and color at that location.
Data Archive. Click Data Archive in the toolbar to access the full historical archive of drought data for download and analysis.
Methods documentation. Click Methods to read detailed documentation on how each variable is calculated and what data sources are used.
Send feedback. Found a bug or have a feature request? Click Feedback to let us know.
Open source. Click GitHub to view the source code and data pipeline behind this dashboard.
Convergence of Evidence. Open the Convergence of Evidence section in the sidebar to composite multiple drought indices (SPI, SPEI, EDDI, SVPDI) into a single map. Choose your indices, timescales, and weights, then compute a median or mean composite to see where multiple indicators agree on drought conditions.
Feedback
Partners & Acknowledgments
D³ is a collaboration across academic, state, and federal drought monitoring programs. Interested in partnering? Reach out here.
Explore real-time drought conditions across the continental United States.
■Map drought severity at national, state, and county scales using multiple drought indices and climate variables.
■Compare indicators across timescales and reference periods, or composite them into a single convergence-of-evidence view.
■Overlay station data including streamflow, snowpack, and weather station observations for ground-truth context.
■Export & share — download maps and data, or click Share to save a URL that captures your exact view for bookmarking or showing colleagues.