Spring Flood and Water Resource Outlook for Western South Dakota and Northeastern Wyoming

Updated: May 2, 2014
Next Update: As needed during spring 2014
 

Spring Flood and Water Resource Outlook

This spring flood and water resource outlook is for the Rapid City Hydrologic Service Area (HSA) which covers northeastern Wyoming and western South Dakota. The main river basins include the Little Missouri, Eastern Powder, Belle Fourche, Grand, Moreau, Cheyenne, Upper Missouri, White and Keyapaha River Basins.  

Current Flooding

To obtain the latest watches, warnings, statements, and advisories, go to: http://www.crh.noaa.gov/hazards/unr

Conditions as of May 2, 2014 

Precipitation

Since October 1, 2013 precipitation has been above average, especially since October was extremely wet. Runoff from the October blizzard and large rainstorms that followed, saturated the soil and filled stock ponds. This moisture has left very little room for rain runoff this spring. 
Click here for preliminary monthly precipitation amounts for northeastern Wyoming and western South Dakota.

Central Plains
Percent of Normal Precipitation since October 1

Wyoming
Departure from Normal Precipitation

South Dakota
Departure from Normal Precipitation

Image of Percent of Normal Precipitation for the Water Year

Current Climate Summary Map

Current Climate Summary Map

Monthly Percent of Normal Precipitation from the High Plains Climate Center

Snow Cover and Liquid Water Content

Current snowpack is confined to the higher elevations of the Black Hills and Bear Lodge Mountains. Snow cover at lower elevations is minimal.

Snow Depth

Snow Water Equivalent

Thumbnail image of Snow Depth

Thumbnail image of Snow Water Equivalent

Modeled Snow Analyses from National Operational Hydrologic Remote Sensing Center

Cole Canyon

North Rapid Creek

Blind Park

NRCS Snotel Graphic for Cole Canyon

NRCS Snotel Graphic for North Rapid Creek

NRCS Snotel Graphic for Blind Park

Black Hills and Bear Lodge Mountain Snotel Data from the Natural Resources Conservation Service

Soil Conditions and Frost Depths

Soil moisture is above average across most of the area according to the latest calculated values produced by the Climate Prediction Center.  

Calculated Soil Moisture Anomaly

Modeled Snow Moisture from Climate Prediction Center

 Lake and River Conditions

All river basins in the area are reporting normal to much above normal streamflows.

Monthly-Average Streamflow

Streamflow Mapping provided by the USGS

Current Reservoir Data from the Bureau of Reclamation

The graphs below denote reservoir storage levels. The line labeled active is the point where the reservoir is considered "full" which is when the pool elevation is at the top of the active conservation pool. Most reservoirs have additional storage above this level for surplus or to hold flood waters.

Angostura Reservoir

Belle Fourche Reservoir

Deerfield Reservoir

Current Reservoir Data for Angostura Reservoir

Current Reservoir Data for Belle Fourche Reservoir

Current Reservoir Data for Deerfield Reservoir

 

Keyhole Reservoir

Pactola Reservoir

Shadehill Reservoir

Current Reservoir Data for Keyhole Reservoir

Current Reservoir Data for Pactola Reservoir

Current Reservoir Data for Shadehill Reservoir

Precipitation and Temperature Outlook

Climate Prediction Center Temperature and Precipitation Outlooks

8 - 14 Day Temperature Outlook

8 - 14 Day Precipitation Outlook

According to the Climate Prediction Center, the outlook for May indicates a greater chance for below average temperatures with equal chances of below average, above average, or average precipitation. For May, the average high temperature is in the 60s and the average low temperature is in the 40s, temperatures in the Black Hills are typically a little cooler. The average precipitation amount is between 2.5 to 4.5 inches with higher amounts in the Black Hills and Bear Lodge Mountains.

Temperature Outlook

Precipitation Outlook

Monthly Temperature Outlook

Monthly Precipitation Outlook

According to the Climate Prediction Center, the three month outlook covering May, June, and July indicates a greater chance for below average temperatures with equal chances of average, below average, and above average precipitation.

Three Month Temperature Outlook

Three Month Precipitation Outlook

Three Monthly Temperature Outlook

Three Monthly Precipitation Outlook

Questions or Comments

If you have any questions or comments about this spring flood and water resource outlook please contact,

Melissa Smith
Service Hydrologist
National Weather Service
300 East Signal Drive
Rapid City South Dakota 57701
Telephone 605-341-9271
E-mail
melissa.smith@noaa.gov 

 

 


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