Drought Information Statement
Issued by NWS Riverton, WY

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AXUS75 KRIW 100414
DGTRIW
WYC003-013-017-019-023-025-029-033-035-037-039-041-043-100415-

DROUGHT INFORMATION STATEMENT
NATIONAL WEATHER SERVICE RIVERTON WY
1014 PM MDT THU APR 9 2015

...MODERATE/SEVERE DROUGHT CREEPS NORTH INTO SOUTHWEST WYOMING
DURING FEBRUARY AND MARCH...
...FIRST THREE MONTHS OF 2015 WARMEST ON 121 YEARS OF RECORD IN WYOMING...

SYNOPSIS...MODERATE /D1/ AND SEVERE /D2/ DROUGHT CONDITIONS
PUSHED NORTH ACROSS THE EASTERN GREAT BASIN INTO SOUTHERN WYOMING
IN FEBRUARY AND MARCH. WYOMING BEGAN 2015 DROUGHT FREE WITH A
SMALL AREA NORTHEAST SWEETWATER COUNTY CLASSIFIED AS ABNORMALLY
DRY. ON APRIL 7TH...MODERATE DROUGHT COVERED MOST OF SOUTHERN
SWEETWATER COUNTY WITH A SMALL AREA OF SEVERE DROUGHT IN FAR
SOUTHERN SWEETWATER COUNTY. ABNORMALLY DRY CONDITIONS SPREAD INTO
MOST AREAS WEST OF THE CONTINENTAL DIVIDE.

JANUARY-MARCH 2015 WAS THE WARMEST FIRST THREE MONTHS OF THE YEAR
ON 121 YEARS OF RECORD FOR WYOMING WITH A STATEWIDE AVERAGE
TEMPERATURE OF 30.5F DEGREES...OR 7.2F ABOVE THE 20TH CENTURY
AVERAGE OF 23.3F.  THIS BREAKS THE OLD RECORD OF JANUARY THROUGH
MARCH 1934 WHEN THE STATEWIDE AVERAGE TEMPERATURE WAS 29.9F.

THE FIRST THREE MONTHS OF 2015 WERE ALSO THE 6TH DRIEST SINCE 1895
FOR WYOMING WITH STATEWIDE AVERAGE PRECIPITATION OF 2.23 INCHES.
THE 20TH CENTURY AVERAGE FOR THIS PERIOD IS 3.28 INCHES.

FOR THE CURRENT WATER YEAR...OCTOBER 2014 THROUGH MARCH
2015...STATEWIDE AVERAGE PRECIPITATION FOR WYOMING IS 5.71
INCHES...88 PERCENT OF THE 20TH CENTURY AVERAGE OF 6.52 INCHES.
OCTOBER 2014 THROUGH MARCH 2015 RANK AS THE 34TH DRIEST PERIOD
OVER 120 YEARS.

SUMMARY OF IMPACTS...

RIVER AND STREAMFLOW CONDITIONS.

BELOW NORMAL SNOWMELT STREAMFLOW VOLUMES ARE EXPECTED ACROSS
ALMOST ALL MAJOR BASINS ACROSS WYOMING. BASIN SNOWPACK AVERAGED
FROM NEAR 50 PERCENT TO 65 PERCENT ACROSS SOUTHERN WYOMING...ON
THE LOW END WAS THE UPPER BEAR RIVER BASIN IN THE SOUTHWEST AT 49
AND ON THE HIGHER END WAS THE SOUTH PLATTE BASIN AT 67 PERCENT.
MOST BASINS ACROSS NORTH AND CENTRAL WYOMING RANGED FROM NEAR 75
PERCENT TO 90 PERCENT...ON THE LOW END WAS THE MADISON RIVER
BASIN AT 65 PERCENT...AND THE UPPER GREEN RIVER BASIN HAD THE
HIGHEST BASIN-WIDE SNOWPACK IN THE STATE AT 88 PERCENT.

FIRE WEATHER IMPACTS.

THE SIGNIFICANT WILDLAND FIRE POTENTIAL OUTLOOK FOR APRIL 2014
SHOWS ABOVE NORMAL SIGNIFICANT WILDLAND FIRE POTENTIAL ACROSS
NORTHEAST WYOMING. THE REST OF THE STATE`S POTENTIAL WAS
CLASSIFIED AS NORMAL. NORTHEAST WYOMING WAS EXPECTED TO RETURN TO
NORMAL POTENTIAL IN MAY WITH THE OUTLOOK SHOWING NORMAL
SIGNIFICANT WILDLAND FIRE POTENTIAL IN JUNE AND JULY.

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-MAR 2015      NORMALS)
--------            ------------------    ---------

AIRPORTS

0 BIG PINEY                0.38                18
  BUFFALO                  1.35                38
  CASPER                   5.06               119
0 EVANSTON                 2.33                49
  GREYBULL                 1.21                61
  LANDER                   5.02               103
  RIVERTON                 2.71                98
1 ROCK SPRINGS             0.87                25
  SHERIDAN                 4.71                99
  WORLAND                  2.31               107

COOPERATIVE OBSERVER STATIONS

0 AFTON                    5.77                70
1 BITTER CREEK 4 NE        1.96                81
  CODY                     4.42               151
  DUBOIS                   3.05               114
0 FOSSIL BUTTE
  NATIONAL MONUMENT        3.27                70
1 GREEN RIVER              3.03                97
  JEFFREY CITY             2.92                83
  KAYCEE                   3.05                92
0 MOOSE                   11.90                93
0 OLD FAITHFUL             9.43(M)             70
  POWELL FIELD STATION     0.91                61
  RIVERTON (DOWNTOWN)      2.93               110
  THERMOPOLIS              3.75                89

--------------------------------------------
| 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 ONE MONTH AND THREE MONTH OUTLOOKS WILL BE UPDATED ON THE
THIRD THURSDAY OF THE CURRENT MONTH FOR THE NEXT MONTH AND THREE
MONTH OUTLOOKS.

THE APRIL OUTLOOK FOR WYOMING SHOWED EQUAL CHANCES OF
ABOVE...BELOW OR NORMAL TEMPERATURES. THE APRIL OUTLOOK FOR PRECIPITATION
SHOWS A GREATER THAN EVEN CHANCE FOR BELOW NORMAL PRECIPITATION
ACROSS MOST OF EASTERN WYOMING WITH THE GREATEST CHANCE ALONG THE
EASTERN BORDER. THE WEST HALF OF THE STATE HAS EQUAL CHANCES OF
ABOVE...BELOW OR NORMAL PRECIPITATION...OR NO CLEAR CLIMATE
SIGNAL.

THE THREE MONTH OUTLOOK FOR APRIL...MAY AND JUNE SHOWS A GREATER
THAN EVEN CHANCE FOR ABOVE NORMAL TEMPERATURES ACROSS THE
NORTH...CENTRAL AND WEST WITH THE GREATEST CHANCE OF ABOVE NORMAL
TEMPERATURES ACROSS THE FAR WEST. THE SOUTHEAST PORTION OF THE
STATE HAS EQUAL CHANCES OF ABOVE...BELOW OR NORMAL TEMPERATURES.

THE THREE MONTH OUTLOOK FOR PRECIPITATION SHOWS A GREATER THAN
EVEN CHANCE FOR ABOVE NORMAL PRECIPITATION ACROSS SOUTHERN WYOMING
WHILE THERE IS EQUAL CHANCES OR NO CLEAR CLIMATE SIGNAL ACROSS THE
NORTH.

THE U.S. SEASONAL DROUGHT OUTLOOK RELEASED ON MARCH 19TH THAT
DROUGHT CONDITIONS WERE LIKELY TO PERSIST THE AREAS IN MODERATE TO
SEVERE DROUGHT ACROSS SOUTHERN WYOMING...MAINLY SWEETWATER
COUNTY...THROUGH THE END OF JUNE 2015.

HYDROLOGIC SUMMARY AND OUTLOOK...

SNOWPACK DATA ON APRIL 9TH-

DRAINAGE BASIN                    SNOW WATER EQUIVALENT (SWE)
                                  PERCENT OF MEDIAN
--------------                    ---------------------------
SNAKE RIVER                                82
MADISON                                    65
YELLOWSTONE                                86
WIND RIVER                                 73
BIGHORN BASIN                              81
SHOSHONE RIVER                             79
POWDER                                     81
TONGUE                                     75
CHEYENNE                                    0
UPPER PLATTE                               65
SWEETWATER                                 54
LOWER NORTH PLATTE                         50
LARAMIE                                    66
SOUTH PLATTE                               67
LITTLE SNAKE RIVER                         57
UPPER GREEN                                88
LOWER GREEN                                55
UPPER BEAR                                 49
----------------------                    ----
WEIGHTED STATE AVERAGE                     62

RESERVOIR DATA FOR APRIL 9TH -

RESERVOIR                 PERCENT FULL

CENTRAL WYOMING
BOYSEN                      88.4
BUFFALO BILL                75.4
BULL LAKE                   69.7
PATHFINDER                  64.0

UPPER GREEN RIVER BASIN
BIG SANDY                   65.0
FONTENELLE                  57.0
FLAMING GORGE               85.0

UPPER SNAKE RIVER BASIN
GRASSY LAKE                 87.0
JACKSON LAKE                77.0

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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