Drought Conditions in Wyoming and Montana

Science Center Objects

The USGS monitors drought conditions at more than 300 streamgages across Wyoming and Montana. Low-flow conditions are expressed as percentiles comparing current (within the past few hours) instantaneous flow to historical daily mean flow for all days of the year.

A percentile is a value on a scale of one hundred that indicates the percent of a distribution that is equal to or below it.

  • Low" indicates that the estimated streamflow is a new record low for this day of the year,
  • "<=5" indicates that the estimated streamflow is less than or to the 5th percentile for this day of the year,
  • "6-9" indicates that the estimated streamflow is between the 6th and 9th percentile for this day of the year, and
  • "10-24" indicates that the estimated streamflow is between the 10th and 24th percentile for this day of the year.

National Integrated Drought Information System (NIDIS) goal is to improve the nation’s capacity to manage drought-related risks by providing the best available information and tools to assess the potential impacts of drought, and to prepare for and mitigate the effects of drought.

Wyoming DroughtWatch

Average Streamflow Maps:

Wyoming:

 

 

 

 

Montana DroughtWatch

Montana: