Drought Information Statement
Issued by NWS Riverton, WY

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000
AXUS75 KRIW 191215
DGTRIW
WYC003-013-017-019-023-025-029-033-035-037-039-041-043-181215-

DROUGHT INFORMATION STATEMENT
NATIONAL WEATHER SERVICE RIVERTON WY
615 AM MDT TUE MAY 19 2015

...DROUGHT CONDITIONS REMAIN UNCHANGED ACROSS SOUTHWEST WYOMING SINCE
MID-APRIL...OUTLOOK SHOWS IMPROVING CONDITIONS...

SYNOPSIS...MODERATE /D1/ AND A SMALL AREA OF SEVERE /D2/ DROUGHT
CONDITIONS REMAINED SOUTHWEST WYOMING ON THE LATEST DROUGHT
MONITOR. THESE DROUGHT CONDITIONS PUSHED NORTH ACROSS THE EASTERN
GREAT BASIN INTO SOUTHERN WYOMING IN FEBRUARY AND MARCH...AND HAVE
REMAINED THROUGH MID-MAY. WYOMING BEGAN 2015 DROUGHT FREE WITH A
SMALL AREA NORTHEAST SWEETWATER COUNTY CLASSIFIED AS ABNORMALLY
DRY. HOWEVER...AFTER A VERY DRY AND RECORD WARM FIRST QUARTER OF
THE YEAR...A WET PATTERN HAS SINCE TAKEN HOLD ACROSS THE GREAT
BASIN AND CENTRAL ROCKIES. THE PRECIPITATION OUTLOOK CALLS FOR
CONTINUED ELEVATED CHANCES OF ABOVE NORMAL PRECIPITATION ACROSS
WYOMING THROUGH JULY WITH THE LIKELY REMOVAL OF DROUGHT
CONDITIONS IN THE SOUTHWEST.

SUMMARY OF IMPACTS...

RIVER AND STREAMFLOW CONDITIONS.

BELOW NORMAL SNOWMELT STREAMFLOW VOLUMES (50 TO 65 PERCENT) ARE
EXPECTED ACROSS ALMOST ALL MAJOR BASINS ACROSS WYOMING. SEVERAL
CENTRAL AND SOUTHERN BASINS...INCLUDING THE UPPER NORTH
PLATTE...THE WIND...THE LITTLE SNAKE AND THE UPPER BEAR...ARE
FORECASTED TO HAVE WELL BELOW (LESS THAN 60 PERCENT) NORMAL
STREAMFLOW VOLUMES DURING THIS SNOWMELT SEASON. CARRYOVER
RESERVOIR STORAGES ACROSS WYOMING CONTINUE TO BE ABOVE AVERAGE FOR
MAY.

FIRE WEATHER IMPACTS.

FIRE WEATHER ZONES ARE IN GREEN-UP WITH MANY FUELS WET DUE TO
RECENT PRECIPITATION. THE SIGNIFICANT WILDLAND FIRE POTENTIAL
OUTLOOK FOR JULY AND AUGUST SHOWS THAT THERE WILL BE A HIGHER
THAN USUAL LIKELIHOOD THAT WILDFIRES WILL OCCUR AND BECOME
SIGNIFICANT EVENTS ACROSS THE NORTHERN TWO-THIRDS OF WYOMING.

CLIMATE SUMMARY...

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

LOCATION            PRECIPITATION         % OF NORMAL
                    (INCHES)              (1981-2000
                    OCT 2014-APR 2015      NORMALS)
--------            ------------------    ---------

AIRPORTS

0 BIG PINEY                0.94                35
  BUFFALO                  2.13                44
  CASPER                   6.72               121
0 EVANSTON                 2.90                49
  GREYBULL                 1.32                49
  LANDER                   7.33               109
  RIVERTON                 3.53                87
1 ROCK SPRINGS             1.54                35
  SHERIDAN                 5.95                94
  WORLAND                  2.66                88

COOPERATIVE OBSERVER STATIONS

0 AFTON                    7.24                74
1 BITTER CREEK 4 NE        2.30                75
  CODY                     6.08               153
  DUBOIS                   3.60                95
0 FOSSIL BUTTE
  NATIONAL MONUMENT        3.88                68
1 GREEN RIVER              4.55               114
  JEFFREY CITY             4.86               102
  KAYCEE                   4.21                88
0 MOOSE                   12.70                89
0 OLD FAITHFUL            10.37                66
  POWELL FIELD STATION     1.30                65
  RIVERTON (DOWNTOWN)      4.03               110
  THERMOPOLIS              5.35                95

--------------------------------------------
| STATION DROUGHT CONDITION INTENSITY:     |
| 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 8-14 DAY OUTLOOK SHOWED CONTINUED CHANCES OF ABOVE NORMAL
PRECIPITATION ACROSS ALL BUT THE NORTHEAST CORNER OF THE STATE.
THE BEST CHANCES WERE ROUGHLY ALONG AND WEST OF A CODY TO LARAMIE
LINE.

THE THREE MONTH TEMPERATURE OUTLOOK FOR MAY...JUNE AND JULY SHOWS
AN ELEVATED CHANCE FOR ABOVE NORMAL TEMPERATURES ACROSS ROUGHLY
THE WEST HALF OF THE STATE. THE EAST HALF OF THE STATE HAS EQUAL
CHANCES OF ABOVE...BELOW OR NORMAL TEMPERATURES OR NO CLEAR
CLIMATE SIGNAL.

THE THREE MONTH PRECIPITATION OUTLOOK FOR MAY...JUNE AND JULY
SHOWS AN ELEVATED (40 PERCENT OR GREATER) CHANCE OF ABOVE NORMAL
PRECIPITATION ACROSS ALL OF WYOMING.

THE U.S. SEASONAL DROUGHT OUTLOOK INDICATED THAT DROUGHT
CONDITIONS WERE LIKELY TO BE REMOVED ACROSS SOUTHWEST WYOMING BY
THE END OF JULY.

HYDROLOGIC SUMMARY AND OUTLOOK...

SNOWPACK DATA ON MAY 18TH-

DRAINAGE BASIN                    SNOW WATER EQUIVALENT (SWE)
                                  PERCENT OF MEDIAN
--------------                    ---------------------------
SNAKE RIVER                                52
MADISON                                    26
YELLOWSTONE                                67
WIND RIVER                                 70
BIGHORN BASIN                              57
SHOSHONE RIVER                             69
POWDER                                     57
TONGUE                                     64
CHEYENNE                                    0
UPPER PLATTE                               75
SWEETWATER                                 62
LOWER NORTH PLATTE                         85
LARAMIE                                    81
SOUTH PLATTE                              103
LITTLE SNAKE RIVER                         58
UPPER GREEN                                67
LOWER GREEN                                51
UPPER BEAR                                 15
----------------------                    ----
WEIGHTED STATE AVERAGE

RESERVOIR DATA FOR MAY 18TH -

RESERVOIR                 PERCENT FULL

CENTRAL WYOMING
BOYSEN                      91.7
BUFFALO BILL                80.9
BULL LAKE                   78.8
PATHFINDER                  62.3

UPPER GREEN RIVER BASIN
BIG SANDY                   80.0
FONTENELLE                  67.0
FLAMING GORGE               86.0

UPPER SNAKE RIVER BASIN
GRASSY LAKE                100.0
JACKSON LAKE                97.0

NEXT ISSUANCE DATE...

THIS PRODUCT WILL BE UPDATED IF NECESSARY IN RESPONSE TO SIGNIFICANT
CHANGES IN DROUGHT 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

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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