Drought Information Statement
Issued by NWS Riverton, WY

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AXUS75 KRIW 130151
DGTRIW
WYC003-013-017-019-023-025-029-035-037-039-043-150200-

DROUGHT INFORMATION STATEMENT
NATIONAL WEATHER SERVICE RIVERTON WY
751 PM MDT MON SEP 12 2016

...MODERATE TO SEVERE DROUGHT EXPANDED ACROSS NORTHWEST WYOMING IN
THE LATE SUMMER...

SYNOPSIS...

THE LATEST DROUGHT MONITOR RELEASED ON SEPTEMBER 6TH SHOWED
SEVERE /D2/ DROUGHT CONDITIONS HAD DEVELOPED ACROSS NORTHWEST
WYOMING, OR MOST OF YELLOWSTONE NATIONAL PARK, NORTHERN GRAND
TETON NATIONAL PARK AND THE NORTHERN ABSAROKA RANGE. MOST OF THIS
AREA IS REPRESENTED BY CLIMATE DIVISION 1 WHICH HAD ITS SECOND
DRIEST APRIL-AUGUST PERIOD IN THE LAST 123 YEARS. THE DIVISION
AVERAGE PRECIPITATION FOR APRIL-AUGUST 2016 WAS ONLY 7.07 INCHES,
WHICH IS 64 PERCENT OF THE 20TH CENTURY AVERAGE OF 11.00 INCHES.
MODERATE /D1/ DROUGHT CONDITIONS ALSO DEVELOPED FURTHER SOUTH
ACROSS TETON AND NORTHERN LINCOLN COUNTIES DURING AUGUST. MODERATE
TO SEVERE DROUGHT CONDITIONS REMAINED ACROSS THE BIGHORN MOUNTAINS
AND MOST OF THE BIGHORN BASIN.

SUMMARY OF IMPACTS...

RIVER AND STREAMFLOW CONDITIONS.

STREAMFLOWS IN NORTHWEST WYOMING (AREAS WITH MODERATE TO SEVERE
DROUGHT) WERE MUCH BELOW NORMAL. BELOW OR MUCH BELOW NORMAL
STREAMFLOWS WERE ALSO OBSERVED IN THE UPPER WIND RIVER
BASIN AND UPPER GREEN RIVER BASIN. THE REST OF THE AREA HAD NEAR
NORMAL STREAMFLOWS.

FIRE WEATHER IMPACTS...

FUELS WERE CLASSIFIED AS CRITICAL ALL AREAS EXCEPT THE ABSAROKA
MOUNTAINS IN EARLY SEPTEMBER. SEVERAL LARGE WILDFIRES ERUPTED IN
LATE JULY AND AUGUST ACROSS WESTERN WYOMING. MOST OF THESE FIRES
WERE IN YELLOWSTONE NATIONAL PARK, GRAND TETON NATIONAL PARK AND
THE ABSAROKA RANGE - AREAS WITH MODERATE TO SEVERE DROUGHT. THE
TWO LARGEST WILDFIRES IN WESTERN WYOMING WERE THE MAPLE FIRE IN
YELLOWSTONE NATIONAL PARK AT 43,490 ACRES, AND THE BERRY FIRE IN
GRAND TETON NATIONAL PARK AT 20,801 ACRES.

THE SIGNIFICANT WILDLAND FIRE POTENTIAL OUTLOOK FOR SEPTEMBER
SHOWS SHOWS THE GREATER THAN USUAL LIKELIHOOD FOR SIGNIFICANT
WILDFIRES IN AUGUST RETURNING TO NORMAL IN SEPTEMBER.

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-AUGUST 2016
--------               -----------------   ---------

YELLOWSTONE BASIN AVG.    21.52                84
2 OLD FAITHFUL            17.48                73

SNAKE BASIN AVG.          27.85                89
1 AFTON                   13.97                84
1 MOOSE                   18.30                90

GREEN AND BEAR BASIN AVG. 13.23               105
  BIG PINEY AIRPORT        8.72               153
  EVANSTON AIRPORT         4.86                45
  FOSSIL BUTTE N.M.       13.01               131
  GREEN RIVER             13.24               178
  ROCK SPRINGS            12.62               147

BIGHORN BASIN AVG.        12.23                89
1 CODY                    10.19               107
1 GREYBULL AIRPORT         3.38                51
1 POWELL FIELD STATION     4.46                73
  THERMOPOLIS             10.87               104
1 WORLAND AIRPORT          5.76                86

POWDER/TONGUE BASIN AVG.  11.53                82
0 BUFFALO AIRPORT          7.57                62
0 KAYCEE                   8.36                75
0 SHERIDAN AIRPORT        11.66                92

LOWER PLATTE BASIN AVG    15.51               113
  CASPER AIRPORT          14.87               130
  CHEYENNE AIRPORT        16.69               115

WIND RIVER BASIN AVG.     14.55               106
  DUBOIS                   8.57                99
  LANDER AIRPORT          18.80               162
  RIVERTON AIRPORT        11.13               130
  RIVERTON (DOWNTOWN)     11.72               154

UPPER PLATTE BASIN AVG.   12.73               105
  JEFFREY CITY            10.19               110
-------------------------------------------------
STATEWIDE AVERAGE         14.26                97

--------------------------------------------
| 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 SEPTEMBER OUTLOOK FOR WYOMING SHOWS EQUAL CHANCES OF ABOVE
NORMAL, NORMAL OR BELOW NORMAL TEMPERATURES; AND EQUAL CHANCES OF
ABOVE NORMAL, NORMAL OR BELOW NORMAL PRECIPITATION. THUS, THERE
IS NO CLEAR CLIMATE SIGNAL FOR EITHER TEMPERATURE OR PRECIPITATION
FOR SEPTEMBER.

THE THREE MONTH OUTLOOK FOR SEPTEMBER, OCTOBER AND NOVEMBER SHOWS
AN ELEVATED CHANCE OF ABOVE NORMAL TEMPERATURES ACROSS ALL OF
WYOMING. THE THREE MONTH OUTLOOK FOR PRECIPITATION SHOWS AN ELEVATED
CHANCE OF ABOVE NORMAL PRECIPITATION ACROSS THE FAR NORTHERN
PORTION OF WYOMING. THE REST OF WYOMING HAS EQUAL CHANCES OF ABOVE
NORMAL, NORMAL OR BELOW NORMAL PRECIPITATION.

THE SEASONAL DROUGHT OUTLOOK SHOWED DROUGHT CONDITIONS WERE LIKELY
TO IMPROVE ACROSS NORTHERN WYOMING THROUGH THE END OF NOVEMBER.

DURING AUGUST, ENSO-NEUTRAL CONDITIONS PREVAILED ACROSS THE
PACIFIC. ENSO-NEUTRAL (NEITHER EL NINO OR LA NINA) CONDITIONS ARE
SLIGHTLY FAVORED FOR FALL AND WINTER 2016-17.

HYDROLOGIC SUMMARY AND OUTLOOK...

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

RESERVOIR DATA FOR SEPTEMBER 12TH -

RESERVOIR                  PERCENT FULL

CENTRAL WYOMING
   BOYSEN                       83
   BUFFALO BILL                 69
   BULL LAKE                    27
   PATHFINDER                   82

UPPER GREEN RIVER BASIN
   BIG SANDY                    37
   FONTENELLE                   71
   FLAMING GORGE                86

UPPER SNAKE RIVER BASIN
   GRASSY LAKE                  79
   JACKSON LAKE                 59

NEXT ISSUANCE DATE...

THIS PRODUCT WILL BE UPDATED ON OCTOBER 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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