Drought Information Statement
Issued by NWS Riverton, WY

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000
AXUS75 KRIW 210049
DGTRIW
WYC003-013-017-019-023-025-029-035-037-039-043-230100-

DROUGHT INFORMATION STATEMENT
NATIONAL WEATHER SERVICE RIVERTON WY
649 PM MDT Sat Oct 20 2018

...DROUGHT CONDITIONS REMAIN UNCHANGED SINCE MID-SEPTEMBER...
...MODERATE TO SEVERE DROUGHT REMAINS ACROSS PORTIONS OF SOUTHERN
WYOMING...

SYNOPSIS...

Moderate Drought (D1) conditions remained across Uinta and the
southern two-thirds of Sweetwater County. Severe Drought (D2) drought
conditions remained over the Little Snake River Basin in Carbon and
southeast Sweetwater County. Abnormally Dry (D0) conditions persisted
across northern Sweetwater County, Sublette County, Lincoln County
and southern Teton County. Central and eastern Wyoming remained
mostly free of drought. Cool and wet conditions prevailed across the
drought-stricken areas in southern Wyoming during the first half of
October; these areas received 200-300 percent of normal precipitation
from October 1-19, and showed improvement in short-term flash
drought indices.

SUMMARY OF IMPACTS...

RIVER AND STREAMFLOW CONDITIONS.

28 day average streamflows on October 19th showed near or above
normal streamflows across most of northern Wyoming, and near normal
or below normal streamflows across most of southern Wyoming.

FIRE WEATHER IMPACTS...

Wet and cool conditions during the first half of October across
most of southern and central Wyoming resulted in most fuels being
classified as non-critical. Short-term flash drought indicators also
showed much improved conditions across the state during the first
half of October. No large wildfires remained active in Wyoming as of
October 19th.

CLIMATE SUMMARY...

Below are the cumulative precipitation amounts from selected
Locations across west and central Wyoming for the water year
2017-2018 (October 2017-September 2018).

Note: Basin-wide percent of averages are based on 20th century
(1901-2000) averages. Specific locations percent of averages are
based on 1981-2000 normals.

Location               Precipitation       % Of Average
and Drought            (inches)
Condition              Oct 2017-Sep 2018
--------               -----------------    ---------

Yellowstone Basin Avg.    33.02               120
 Old Faithful             28.36               112

Snake Basin Avg.          35.62               108
0 Afton                   17.67                97
0 Moose                   23.24               107

Green and Bear Basin Avg. 10.68                78
0 Big Piney Airport        5.23                81
1 Evanston Airport         4.92                41
1 Rock Springs Airport     3.27                38
0 Fossil Butte N.M.        9.94                90
1 Green River              8.55               103
1 Rock Springs (Fire DP)   6.05                63

Bighorn Basin Avg.        15.98               106
  Cody                    13.43               127
  Greybull Airport         6.19                82
  Powell Field Station     7.00               103
  Thermopolis             10.79                92
  Worland Airport          7.26                96

Powder/Tongue Basin Avg.  15.23               102
  Buffalo Airport         11.61                86
0 Kaycee                  11.39                92
  Sheridan Airport        17.20               121

Lower Platte Basin Avg.   14.44                97
  Casper Airport          12.81               102
  Cheyenne Airport        15.88               100

Wind River Basin Avg.     15.48               104
  Dubois                  13.52               136
  Lander Airport          13.61               108
  Riverton Airport         9.70               103
  Riverton (Downtown)      8.95               106

Upper Platte Basin Avg.   10.34                78
  Jeffrey City             8.00                80
-------------------------------------------------
Statewide Average         15.95               100

--------------------------------------------
| Station`S Drought Intensity (Left Column):|
| 3 - Location in Extreme Drought/D3/       |
| 2 - Location in Severe Drought /D2/       |
| 1 - Location in Moderate Drought /D1/     |
| 0 - Location Abnormally Dry /D0/          |
|   - None                                  |
|                                           |
| (M) Missing Precipitation Data in Record  |
--------------------------------------------

PRECIPITATION/TEMPERATURE OUTLOOKS...

El Nino is favored to form in October and November and continue
through winter 2018-19 (70-75% chance). An El Nino Watch has been
issued for the Fall and Winter 2018-19.

The outlook for November shows a October shows a greater than 40
percent chance of above normal temperatures across the entire state,
with the highest chances (greater than 50 percent chance) roughly
along and west of a Cody to Laramie line. The November outlook for
precipitation shows equal chances of above normal, below normal or
near normal precipitation across most of the state, or no clear
climate signal. Below normal precipitation is slightly favored over
the extreme northwest corner of the state.

The Winter Outlook (Dec-Jan-Feb) shows a greater than 40 percent
chance of above normal temperatures across the entire state, with the
highest chances (greater than 50 percent chance) roughly along and
west of a Cody to Laramie line. The outlook for precipitation shows
an elevated chance of above normal precipitation across the northern
third of Wyoming. The southern two-thirds of the state shows equal
chances of above normal, below normal or near normal precipitation;
or no clear climate signal.

The seasonal drought outlook through December 31st shows drought
conditions are expected to persist across southern Wyoming.

HYDROLOGIC SUMMARY AND OUTLOOK...

Reservoir storages across Wyoming were mostly above average at the end
of August.

Reservoir Data for October 20th -

RESERVOIR                  PERCENT FULL

CENTRAL WYOMING
   Boysen                      86
   Buffalo Bill                71
   Bull Lake                   54
   Pathfinder                  57

UPPER GREEN RIVER BASIN
   Big Sandy                   35
   Fontenelle                  72
   Flaming Gorge               89

UPPER SNAKE RIVER BASIN
   Grassy Lake                 78
   Jackson Lake                76

NEXT ISSUANCE DATE...

This product will be updated on or before November 23, 2018.

&&

RELATED WEB SITES...

Additional information on current drought conditions may be found at
The following web addresses /use lower case letters/...

To report effects of the drought in your area...please go to the
Drought Impact Reporter at...

http://droughtreporter.unl.edu/

...and click on submit a report.

Information for the media may be found at...

http://drought.unl.edu/newsoutreach/informationformedia.aspx

NWS riverton drought page...
https://www.weather.gov/riw/drought

Wind River Indian Reservation and surrounding area climate and
drought Summaries...

http://revampclimate.colostate.edu/revamp/project/wind-river-
Drought-preparedness

USGS Wyoming Drought Watch...
http://wy.water.usgs.gov/projects/drought/

U.S. Drought Monitor...https://www.drought.gov

NOAA Drought Page...https://www.drought.noaa.gov

Climate Prediction Center /CPC/...https://www.cpc.ncep.noaa.gov

Additional River and Reservoir Information...

NWS Advanced Hydrologic Prediction Service /AHPS/...
https://www.water.gov/ahps2/index.php?WFO=riw

NRCS Wyoming...http://www.wy.nrcs.usda.gov

USGS...https://water.usgs.gov/

USBR...https://www.usbr.gov/

Water Resource Data System (WRDS)...http://www.wrds.uwyo.edu

Acknowledgments...

The drought monitor is a multi-agency effort involving noaa/s
National Weather Service and National Climatic Data Center...the
USDA...state And regional center climatologists and the National
Drought Mitigation Center. Information for this statement has been
gathered from NWS and FAA observation sites...State Cooperative
Extension Services...the USDA...USACE And USGS.

Questions or comments...

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

Arthur Meunier
Drought Focal Point
National Weather Service
12744 West US Highway 26
Riverton, Wy 82501
Telephone...307-857-3898
............800-211-1448
Email...arthur.meunier@noaa.gov

$$


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