Drought Information Statement
Issued by NWS Riverton, WY

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AXUS75 KRIW 291220
DGTRIW
WYC003-013-017-019-023-025-029-035-037-039-043-311230-

DROUGHT INFORMATION STATEMENT
NATIONAL WEATHER SERVICE RIVERTON WY
620 AM MDT SUN MAY 29 2016

...DROUGHT REMAINS ACROSS THE BIGHORN MOUNTAINS AND FAR NORTHERN
WYOMING...

SYNOPSIS...

THE LATEST DROUGHT MONITOR RELEASED ON MAY 26TH SHOWED SEVERE
/D2/ DROUGHT REMAINED ALONG WESTERN BIGHORN RANGE FROM POWDER
RIVER PASS NORTHWARD. MODERATE /D1/ DROUGHT REMAINED ACROSS THE
NORTHERN BIGHORN BASIN...JUST NORTH OF A GREYBULL TO POWELL LINE.
A VERY WET SPRING ELIMINATED ABNORMALLY DRY /D0/ OR MODERATE
DROUGHT CONDITIONS ACROSS WEST CENTRAL AND SOUTHWEST WYOMING. THE
OUTLOOK CALLS FOR IMPROVEMENT OR ELIMINATION OF DROUGHT CONDITIONS
ACROSS THE NORTH THROUGH THE SUMMER.

SUMMARY OF IMPACTS...

RIVER AND STREAMFLOW CONDITIONS.

SLIGHTLY BELOW NORMAL SNOWMELT STREAMFLOW VOLUMES (90 TO 95
PERCENT) ARE EXPECTED ACROSS ALMOST ALL MAJOR BASINS ACROSS
WYOMING. ABOVE NORMAL STREAMFLOW VOLUMES ARE EXPECTED ACROSS A
MAJORITY OF THE WIND RIVER BASIN AND UPPER NORTH PLATTE
WATERSHEDS. THE UPPER GREEN...SNAKE AND TONGUE RIVER BASINS ARE
FORECASTED TO HAVE BELOW NORMAL STREAMFLOW VOLUMES DURING THE
SNOWMELT SEASON.

FIRE WEATHER IMPACTS...

FUELS WERE IN GREENUP WITH NO AREAS REPORTING WIDESPREAD
CRITICALLY DRY FUELS.

THE SIGNIFICANT WILDLAND FIRE POTENTIAL OUTLOOK THROUGH AUGUST 2016
SHOWS A NORMAL LIKELIHOOD THAT SIGNIFICANT WILDLAND FIRES WILL
OCCUR. SIGNIFICANT WILDLAND FIRES SHOULD BE EXPECTED AT TYPICAL
TIMES AND INTERVALS DURING NORMAL SIGNIFICANT WILDLAND FIRE
POTENTIAL CONDITIONS.

CLIMATE SUMMARY...

BELOW ARE THE CUMULATIVE PRECIPITATION AMOUNTS FROM
SELECTED LOCATIONS ACROSS WEST AND CENTRAL WYOMING FOR THE
CURRENT WATER YEAR.

NOTE: BASIN-WIDE PERCENT OF AVERAGES ARE BASED ON 20TH CENTURY
(1901-2000) AVERAGES. SPECIFIC LOCATIONS PERCENT OF AVERAGES ARE
BASED ON 1981-2010 NORMALS.

LOCATION               PRECIPITATION       % AVERAGE
AND DROUGHT            (INCHES)
CONDITION              OCT 2015-APRIL 2016
--------               -----------------   ---------

YELLOWSTONE BASIN AVG.    16.05                93
  OLD FAITHFUL            12.33                79

SNAKE BASIN AVG.          22.28                95
  AFTON                    9.24                94
  MOOSE                   15.11               106

GREEN AND BEAR BASIN AVG.  8.31               104
  BIG PINEY AIRPORT        3.30               124
  EVANSTON AIRPORT         2.32                39
  FOSSIL BUTTE N.M.        7.50               132
  GREEN RIVER              7.83               196
  ROCK SPRINGS             8.44               183

BIGHORN BASIN AVG.         7.95               106
0 CODY                     6.62               166
0 GREYBULL AIRPORT         1.43                53
0 POWELL FIELD STATION     2.04               101
  THERMOPOLIS              8.81               156
  WORLAND AIRPORT          3.63               121

POWDER/TONGUE BASIN AVG.   7.00               104
  BUFFALO AIRPORT          4.66                96
  KAYCEE                   5.13               108
  SHERIDAN AIRPORT         8.55               134

LOWER PLATTE BASIN AVG    10.06               159
  CASPER AIRPORT           9.15               165
  CHEYENNE AIRPORT        10.45               185

WIND RIVER BASIN AVG.      9.53               121
  DUBOIS                   4.44               117
  LANDER AIRPORT          12.68               188
  RIVERTON AIRPORT         7.53               185
  RIVERTON (DOWNTOWN)      8.66               237

UPPER PLATTE BASIN AVG.    8.55               122
  JEFFREY CITY             6.37               134
-------------------------------------------------
STATEWIDE AVERAGE          9.32               112

--------------------------------------------
| 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...

THE OUTLOOK FOR JUNE CALLS FOR EQUAL CHANCES OF ABOVE...BELOW  OR
NORMAL TEMPERATURES ACROSS WEST AND CENTRAL WYOMING OR NO CLEAR
CLIMATE SIGNAL. THE PRECIPITATION OUTLOOK FOR JUNE SHOWS A 40
PERCENT OR GREATER CHANCE OF ABOVE NORMAL PRECIPITATION ACROSS
WYOMING.

THE SUMMER OUTLOOK (JUNE, JULY AND AUGUST) SHOWS A SLIGHT CHANCE
FOR ABOVE NORMAL TEMPERATURES ACROSS MOST OF WYOMING WITH A HIGHER
CHANCE (GREATER THAN 40 PERCENT) ACROSS THE FAR WEST. THE SUMMER
OUTLOOK FOR PRECIPITATION SHOWS AN ELEVATED CHANCE OF ABOVE NORMAL
PRECIPITATION WITH THE HIGHEST CHANCES (GREATER THAN 40 PERCENT)
ROUGHLY ALONG AND SOUTH OF A CASPER TO RIVERTON TO ROCK SPRINGS
LINE.

THE SEASONAL DROUGHT OUTLOOK SHOWED EITHER IMPROVEMENT OR REMOVAL
OF DROUGHT CONDITIONS BY THE END OF AUGUST ACROSS NORTH CENTRAL
WYOMING. THERE WERE NO AREAS OF NEW DROUGHT DEVELOPMENT FORECAST
IN WYOMING THROUGH THE END OF AUGUST.

LA NINA CONDITIONS ARE FAVORED TO DEVELOP IN DURING THE SUMMER
AND CONTINUE DURING THE FALL AND WINTER 2016-17. THIS DEVELOPMENT WILL
BRING AN ELEVATED CHANCE OF ABOVE NORMAL PRECIPITATION ACROSS THE
NORTHERN ROCKIES DURING THE FALL AND WINTER 2016-17.

HYDROLOGIC SUMMARY AND OUTLOOK...

WEIGHTED STATEWIDE AVERAGE SNOWPACK WAS 139 PERCENT OF AVERAGE IN
LATE MAY. SNOWPACK "WATER" NUMBERS OR SNOW WATER EQUIVALENT WERE
HIGHEST ACROSS THE BASINS OF SOUTHERN WYOMING...VARYING MOSTLY
BETWEEN 125 AND 175 PERCENT OF MEDIAN. SNOW WATER EQUIVALENTS
ACROSS NORTHERN BASINS MOSTLY RANGED FROM 60 TO 70 PERCENT OF
MEDIAN.

RESERVOIR STORAGES ACROSS WYOMING REMAINED AT 115 TO 125
PERCENT FOR MAY.

RESERVOIR DATA FOR MAY 28TH -

RESERVOIR                  PERCENT FULL

CENTRAL WYOMING
   BOYSEN                      88.5
   BUFFALO BILL                77.7
   BULL LAKE                   69.0
   PATHFINDER                  99.7

UPPER GREEN RIVER BASIN
   BIG SANDY                   87.0
   FONTENELLE                  73.0
   FLAMING GORGE               91.0

UPPER SNAKE RIVER BASIN
   GRASSY LAKE                100.0
   JACKSON LAKE                93.0

NEXT ISSUANCE DATE...

THIS PRODUCT WILL BE UPDATED ON JUNE 15 2016 OR SOONER IF
NECESSARY IN RESPONSE TO SIGNIFICANT CHANGES IN CONDITIONS.

&&

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...
HTTP://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...HTTP://WWW.DROUGHT.GOV

NOAA DROUGHT PAGE...HTTP://WWW.DROUGHT.NOAA.GOV

CLIMATE PREDICTION CENTER /CPC/...HTTP://WWW.CPC.NCEP.NOAA.GOV

ADDITIONAL RIVER AND RESERVOIR INFORMATION...

NWS ADVANCED HYDROLOGIC PREDICTION SERVICE /AHPS/...
HTTP://WWW.WATER.GOV/AHPS2/INDEX.PHP?WFO=RIW

NRCS WYOMING...HTTP://WWW.WY.NRCS.USDA.GOV

USGS...HTTP://WATER.USGS.GOV/

USBR...HTTP://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
CLIMATE/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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