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