Drought Information Statement
Issued by NWS Rapid City, SD

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AXUS73 KUNR 211616
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Drought Information Statement
National Weather Service Rapid City SD
900 AM MDT Thu Dec 21 2017

...Drought Conditions Continue Across Western South Dakota...

SYNOPSIS...

Climatology speaking, we are in the driest time of the year, which
has kept drought conditions constant over the past month. Typically,
drought conditions don`t change very much during the winter unless
significant precipitation is received. Precipitation during the
winter is typically minimal, accounting for less than 10% of the
annual precipitation over the plains and about 15% of the annual
precipitation in the Black Hills and Bear Lodge Mountains.

The latest U.S. Drought Monitor depicts:

* Extreme (D3) drought conditions across far southwestern Ziebach,
  southeastern Perkins, eastern Meade, eastern Pennington, and
  far northwestern Haakon Counties.
* Severe (D2) drought conditions covered the rest of Perkins County,
  as well as parts of far northeastern Harding, eastern Butte,
  central Meade, eastern Pennington, and northern and western Oglala
  Lakota, northeastern Fall River, northern Jackson, western Haakon,
  and northern Ziebach Counties.
* Moderate (D1) drought in South Dakota covered the rest of Harding,
  Butte, Meade, Pennington, Fall River, Oglala Lakota, Jackson,
  Haakon, and Ziebach Counties, as well as Custer, eastern Lawrence,
  Bennett, western Todd, and western Mellette Counties. In
  northeastern Wyoming, Moderate (D1) drought conditions covered far
  northeastern Campbell and northern Crook Counties.
* Abnormally dry (D0) conditions covered the rest of Crook and
  northern Campbell Counties in northeastern Wyoming, as well as
  rest of western South Dakota.

SUMMARY OF IMPACTS...

Drought impacts continue to be reported by producers due to dry
soils. Stock ponds and dugouts are dry or contain water of poor
quality. Numerous pasture and hay lands have not been able to
recover from the dry conditions over the summer.

CLIMATE SUMMARY...

So far in December, temperatures have been above average and
precipitation has been below average.

PRECIPITATION/TEMPERATURE OUTLOOK...

Sea surface temperatures in the tropical Pacific Ocean are below
average, indicating La Nina conditions. The outlook for the winter
and spring is for La Nina conditions to continue through the winter
before trending toward El Nino Southern Oscillation (ENSO) neutral
conditions by the late spring. For the northern plains, this pattern
typically favors near average temperatures for the early part of the
winter, trending to below average temperatures by the middle of the
winter which would last through the spring. For precipitation, near
average amounts are expected in most areas with the possibility of
above average precipitation across northwestern South Dakota,
northeastern Wyoming, and the northern Black Hills. However, this
pattern also tends to bring less precipitation to the southern Black
Hills and far southwestern South Dakota. Overall, precipitation in
the winter is only around an inch for the December through February
time period and is only 7% of the annual precipitation.

The outlook for January calls for near to below average temperatures
and near to above average precipitation.

The three-month outlook for January, February and March calls for
near to below average temperatures and near to above average
precipitation.

The U.S. Monthly Drought Outlook indicates drought conditions will
persist through the winter.

HYDROLOGIC SUMMARY AND OUTLOOK...

According to the Bureau of Reclamation, October end of the month
reservoir elevations at Angostura, Belle Fourche, Deerfield,
Keyhole, and Pactola were above average for this time of the year.
However, end of the month reservoir elevation at Shadehill was below
average. October inflows into these reservoirs were mainly below
average, with the exception of inflows into Angostura, Deerfield and
Pactola which were above average.

According to the U.S. Geological Survey 28-day average streamflow
compared to historical streamflow for the day of the year indicates
normal to conditions across much of the area.

NEXT ISSUANCE...

The next drought statement will be issued in January 2018.

&&

ACKNOWLEDGMENTS...

The drought monitor is a multi-agency effort involving NOAA`s
National Weather Service and the National Centers for Environmental
Information, United States Department of Agriculture (USDA), State
and Regional Climate Centers, and the National Drought Mitigation
Center at the University of Nebraska-Lincoln. Information for this
statement has been gathered from the NWS and Federal Aviation
Administration observing sites, State Cooperative Extension
Services, United States Department of Agriculture, Bureau of
Reclamation, and the United States Geological Survey.

QUESTIONS OR COMMENTS...

If you have any questions or comments about this drought
information, please contact...

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

RELATED WEB SITES...

U.S. Drought page...
http://www.drought.gov

South Dakota Climate and Weather Information...
http://climate.sdstate.edu

Wyoming Water and Climate Information...
http://www.wrds.uwyo.edu/

U.S. Drought Monitor...
http://droughtmonitor.unl.edu

River and Reservoir Information
NWS - http://water.weather.gov/ahps
USGS - http://www.usgs.gov/water
USBR - http://www.usbr.gov/gp/lakes_reservoirs

Climate Prediction Center...
http://www.cpc.ncep.noaa.gov

Black Hills Fire Restrictions...
http://blackhillsfirerestrictions.com

$$



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