Drought Information Statement
Issued by NWS Riverton, WY

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WYC003-013-017-019-023-025-029-035-037-039-043-310315-

DROUGHT INFORMATION STATEMENT
NATIONAL WEATHER SERVICE RIVERTON WY
914 PM MDT THU JUL 28 2016

...MODERATE TO SEVERE DROUGHT EXPANDED ACROSS THE BIGHORN BASIN IN
JUNE...

SYNOPSIS...

THE LATEST DROUGHT MONITOR RELEASED ON JULY 26TH SHOWED SEVERE
/D2/ DROUGHT CONDITIONS HAD DEVELOPED ACROSS THE NORTHEAST BIGHORN
BASIN IN JUNE WHILE MODERATE /D1/ DROUGHT OR ABNORMALLY DRY /D0/
CONDITIONS (GOING INTO DROUGHT) CONTINUED TO EXPAND ACROSS NORTH
CENTRAL AND NORTHWEST WYOMING. THE BIGHORN DRAINAGE, CLIMATE
DIVISION 4, HAD THE 10TH DRIEST JUNE ON 122 YEARS OF RECORD WITH
VERY DRY CONDITIONS PERSISTING THROUGH LATE JULY.

SUMMARY OF IMPACTS...

RIVER AND STREAMFLOW CONDITIONS.

28 DAY AVERAGE STREAMFLOW RANKINGS ACROSS NORTHERN WYOMING SHOWED
BELOW NORMAL STREAMFLOW CORRESPONDING TO MODERATE HYDROLOGIC
DROUGHT PREVAILING ACROSS NORTHERN WYOMING. 28 DAY STREAMFLOW
RANKED NEAR NORMAL ACROSS MOST OF SOUTHERN WYOMING.

FIRE WEATHER IMPACTS...

FUELS WERE CLASSIFIED AS CRITICAL ACROSS MOST OF NORTH AND CENTRAL
WYOMING IN LATE JULY. LIGHTNING CAUSED TWO SIGNIFICANT WILDFIRES
IN MID-JULY. THE CLIFF CREEK FIRE, 5 MILES NORTH OF BONDURANT,
STARTED ON JULY 17TH AND HAD GROWN TO 21483 ACRES ON JULY 29TH.
THE LAVA MOUNTAIN FIRE, 20 MILES NORTHWEST OF DUBOIS, STARTED ON
JULY 11TH AND HAD GROWN TO 12,169 ACRES ON JULY 29TH. SEVERAL
WILDFIRES, BOTH LIGHTNING AND HUMAN CAUSED, WERE BURNING IN THE
BIGHORN MOUNTAINS.

THE SIGNIFICANT WILDLAND FIRE POTENTIAL OUTLOOK FOR AUGUST 2016 SHOWS
GREATER THAN USUAL LIKELIHOOD THAT SIGNIFICANT WILDFIRES WILL
OCCUR ACROSS NORTHEAST WYOMING, OR ALONG AND EAST OF THE BIGHORN
MOUNTAINS. THE REST OF WYOMING IS EXPECTED TO SEE NORMAL
SIGNIFICANT WILDLAND FIRE POTENTIAL FOR THE LATE SUMMER PERIOD.

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       % OF AVERAGE
AND DROUGHT            (INCHES)
CONDITION              OCT 2015-JUNE 2016
--------               -----------------   ---------

YELLOWSTONE BASIN AVG.    19.98                88
0 OLD FAITHFUL            15.07                72

SNAKE BASIN AVG.          26.73                94
0 AFTON                   13.44                96
0 MOOSE                   17.37                98

GREEN AND BEAR BASIN AVG. 12.44               117
  BIG PINEY AIRPORT        8.02               187
  EVANSTON AIRPORT         4.68                52
  FOSSIL BUTTE N.M.       12.54               154
  GREEN RIVER             12.27               198
  ROCK SPRINGS            12.23               178

BIGHORN BASIN AVG.        10.99                94
0 CODY                     8.56               114
1 GREYBULL AIRPORT         2.96                53
1 POWELL FIELD STATION     3.72                78
  THERMOPOLIS             10.13               112
1 WORLAND AIRPORT          5.34                96

POWDER/TONGUE BASIN AVG.   9.63                83
0 BUFFALO AIRPORT          6.56                68
0 KAYCEE                   7.64                85
0 SHERIDAN AIRPORT        10.00                92

LOWER PLATTE BASIN AVG    13.54               124
  CASPER AIRPORT          13.33               145
  CHEYENNE AIRPORT        14.56               141

WIND RIVER BASIN AVG.     13.57               115
  DUBOIS                   7.51               112
  LANDER AIRPORT          18.28               179
  RIVERTON AIRPORT        10.69               151
  RIVERTON (DOWNTOWN)     11.37               180

UPPER PLATTE BASIN AVG.   11.92               118
  JEFFREY CITY             9.52               123
-------------------------------------------------
STATEWIDE AVERAGE         12.71               114

--------------------------------------------
| 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 AUGUST SHOWS ABOVE NORMAL TEMPERATURES ARE FAVORED
ACROSS THE SOUTHWEST TWO-THIRDS OF WYOMING WITH THE GREATEST
CHANCE ACROSS THE SOUTHWEST THIRD OF THE STATE. THE NORTHEAST
THIRD OF THE STATE HAS EQUAL CHANCES OF ABOVE, BELOW OR NORMAL
TEMPERATURES. ABOVE NORMAL PRECIPITATION IS FAVORED IN THE BLACK
HILLS REGION. THE REST OF WYOMING HAS EQUAL CHANCES FOR
ABOVE, BELOW OR NORMAL PRECIPITATION (A WEAK CLIMATE SIGNAL)
DURING AUGUST.

THE THREE MONTH OUTLOOK FOR AUGUST, SEPTEMBER AND OCTOBER SHOWS
ABOVE NORMAL TEMPERATURES ARE FAVORED ACROSS ALL OF WYOMING. THE
GREATEST CHANCE OF ABOVE NORMAL TEMPERATURES IS APPROXIMATELY
WEST OF A CODY TO LARAMIE LINE. THE 90 DAY PRECIPITATION OUTLOOK
FOR WYOMING SHOWS ABOVE NORMAL PRECIPITATION FAVORED ACROSS THE
BLACK HILLS REGION OF WYOMING. THE REST OF WYOMING HAS EQUAL
CHANCES FOR ABOVE, BELOW OR NORMAL PRECIPITATION.

THE SEASONAL DROUGHT OUTLOOK SHOWED DROUGHT CONDITIONS WERE LIKELY
TO PERSIST ACROSS THE BIGHORN RANGE AND THE NORTHERN BIGHORN BASIN
THROUGH THE END OF OCTOBER. THERE WERE NO AREAS OF NEW DROUGHT
DEVELOPMENT FORECAST IN WYOMING THROUGH THE END OF OCTOBER.

LA NINA CONDITIONS ARE FAVORED TO DEVELOP DURING AUGUST THROUGH
OCTOBER 2016, WITH ABOUT A 55-60 PERCENT CHANCE OF LA NINA DURING
THE FALL AND WINTER 2016-2017. THIS DEVELOPMENT WILL BRING AN
ELEVATED CHANCE OF ABOVE NORMAL PRECIPITATION ACROSS THE NORTHERN
ROCKIES DURING THE LATE FALL AND WINTER 2016-17, INCLUDING
NORTHERN AND WESTERN PORTIONS OF WYOMING.

HYDROLOGIC SUMMARY AND OUTLOOK...

RESERVOIR STORAGES ACROSS WYOMING WERE IN RELATIVELY GOOD
CONDITION FOR JULY.

RESERVOIR DATA FOR JULY 27TH -

RESERVOIR                  PERCENT FULL

CENTRAL WYOMING
   BOYSEN                      92.1
   BUFFALO BILL                90.0
   BULL LAKE                   83.3
   PATHFINDER                  91.9

UPPER GREEN RIVER BASIN
   BIG SANDY                   75.0
   FONTENELLE                  88.0
   FLAMING GORGE               88.0

UPPER SNAKE RIVER BASIN
   GRASSY LAKE                 79.0
   JACKSON LAKE                81.0

NEXT ISSUANCE DATE...

THIS PRODUCT WILL BE UPDATED ON AUGUST 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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