Streamflow, Drought, and Water Supply Conditions
Water supply conditions as of 4/18/2018
From Jacqueline Knutson, Hydrologist, Montana Fish, Wildlife and Parks
Snowpack: At this time the Big Hole Basin is at 149% of average. The Jefferson Basin in its entirety is at 144% of average. The snowpack is holding strong and all snotel sites are well above average with occasional continued augmentation from the winter that does not want to end. With long-range forecasts indicating little change to the cool and wet pattern that has persisted throughout this winter, some additional snotel records may fall as we reach peak snowpack this spring in Montana’s river basins.
Precipitation: Snowfall and precipitation favored the southwest portion of the state over the course of March; moist southwest flow dropped above normal precipitation in the mountains and valleys over the Jefferson River basin. Although it is now officially spring, April and May are both significant for the basin snowfall and precipitation wise and will play a critical role in determining the timing and magnitude of runoff this spring and summer. Hopefully, the wet and cool pattern will persist.
Temperatures: Valley air temperatures for April have been below normal with average highs fluctuating a few degrees above and below the average. The outlook for the remainder of the month is similar below average temperatures.
Period of Record Monthly Climate Summary – Period of Record : 01/01/1923 to 06/09/2016
See details below from Western Regional Climate Center:
WISDOM, MONTANA (249067)
|Average Max. Temperature (F)||26.4||31.1||38.5||49.2||60.3||68.6||79.4||77.8||67.6||55.0||38.0||28.0||51.7|
|Average Min. Temperature (F)||1.2||3.3||10.8||21.2||28.7||36.1||38.2||34.7||27.8||21.3||12.3||3.6||19.9|
|Average Total Precipitation (in.)||0.70||0.52||0.74||0.95||1.64||1.96||1.09||1.03||0.99||0.83||0.76||0.77||11.97|
|Average Total SnowFall (in.)||11.8||8.3||8.6||4.5||2.5||0.5||0.0||0.0||0.5||1.9||7.8||10.8||57.0|
|Average Snow Depth (in.)||9||10||8||1||0||0||0||0||0||0||2||5||3|
Percent of possible observations for period of record.
Max. Temp.: 98.7% Min. Temp.: 98.6% Precipitation: 98.6% Snowfall: 76.4% Snow Depth: 50.3%
National Water Supply Reports
Nation-wide information for water supply and climate prediction & forecasts.
Montana Water Supply Reports
Statewide information for water supply and drought conditions. Report breaks out conditions by major basins:
Water supply and drought condition information specific to the Upper Missouri Basin:
Water Monitoring Resources from the Montana Watershed Coordination Council
Past Streamflow & Snowpack Reports