Drought Information Statement
Issued by NWS Boise, ID

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AXUS75 KBOI 242118
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AXUS75 KBOI DDHHMM
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IDC001-003-005-007-009-011-013-015-017-019-021-023-025-027-029-031-
033-035-037-039-041-043-045-047-049-051-053-055-057-059-061-063-
065-067-071-073-075-077-079-081-083-085-087-ORC001-025-045-250600-

DROUGHT INFORMATION STATEMENT
NATIONAL WEATHER SERVICE BOISE IDAHO
315 PM MDT FRI APR 24 2015

...DROUGHT CONTINUES ACROSS MUCH OF SOUTHERN IDAHO AND SOUTHEAST
OREGON...

SYNOPSIS...

ACCORDING TO THE APRIL 21 U.S. DROUGHT MONITOR...IN SOUTHERN IDAHO
...MODERATE TO SEVERE DROUGHT (D1 AND D2 CLASSIFICATION) EXISTS
ACROSS MUCH OF THE UPPER SNAKE PLAIN...THE WOOD RIVER AND LOST RIVER
BASINS...ACROSS SOUTH CENTRAL IDAHO AND OWYHEE COUNTY...AND ACROSS
MUCH OF WASHINGTON AND ADAMS COUNTIES...AND THE FAR WESTERN PORTION
OF THE PANHANDLE. EXTREME DROUGHT (D3 CLASSIFICATION) EXISTS ACROSS
FAR WESTERN OWYHEE COUNTY AND FAR SOUTHWEST WASHINGTON COUNTY. IN
SOUTHEAST OREGON...EXTREME DROUGHT (D3 CLASSIFICATION) EXTENDS
ACROSS HARNEY AND MALHEUR COUNTIES AND SOUTHERN BAKER COUNTY...WITH
MODERATE TO SEVERE DROUGHT (D1 AND D2 CLASSIFICATION) ACROSS
NORTHERN BAKER COUNTY.

DROUGHT SEVERITY CLASSIFICATION POSSIBLE IMPACTS...
(D1)MODERATE DROUGHT...
SOME DAMAGE TO CROPS. SHORT TERM DRYNESS SLOWING PLANTING AND GROWTH
OF CROPS AND PASTURES. SOME WATER SHORTAGES DEVELOPING OR IMMINENT.
VOLUNTARY WATER USE RESTRICTIONS REQUESTED.

(D2)SEVERE DROUGHT...
CROPS OR PASTURE LOSSES LIKELY. WATER SHORTAGES COMMON. WATER
RESTRICTIONS IMPOSED.

(D3)EXTREME DROUGHT...
MAJOR CROP OR PASTURE LOSSES. WIDESPREAD WATER SHORTAGES OR
RESTRICTIONS.

(D4)EXCEPTIONAL DROUGHT...
EXCEPTIONAL AND WIDESPREAD CROP OR PASTURE LOSSES. SHORTAGES OF
WATER IN RESERVOIRS...STREAMS AND WELLS CREATING WATER EMERGENCIES.

THE SEASONAL OUTLOOK INDICATES THAT DROUGHT WILL PERSIST OR
INTENSIFY THROUGH THE END OF JULY ACROSS SOUTHEAST OREGON. IN
IDAHO...DROUGHT CONDITIONS ARE EXPECTED TO CONTINUE BUT IMPROVE
SLIGHTLY THROUGH THE PERIOD.

SUMMARY OF REPORTED IMPACTS...

A NUMBER OF SMALLER RESERVOIRS IN SOUTH CENTRAL IDAHO ARE HOLDING
WELL BELOW AVERAGE STORAGE. IN EASTERN OREGON...THE MAJORITY OF
LARGE RESERVOIRS ARE HOLDING WELL BELOW AVERAGE STORAGE.

MANY FARMERS IN SOUTH CENTRAL AND SOUTHWEST IDAHO AND SOUTHEAST
OREGON ARE BRACED FOR ANOTHER LOW WATER YEAR WITH BELOW OR WELL
BELOW AVERAGE ALLOTMENTS AND A SHORTENED IRRIGATION SEASON. LOW
SNOWPACK AND EARLY RUNOFF HAVE LED TO EARLY WATER ALLOTMENTS...
MAKING WATER MANAGEMENT DECISIONS AND CROP PLANTING FLEXIBILITY
MORE DIFFICULT.

OREGON WATER RESOURCES DEPARTMENT OFFICIALS ARE EXPECTING SEVERAL
EMERGENCY DROUGHT WELLS TO BE DRILLED AGAIN THIS YEAR IN SOUTHEAST
OREGON.

THE OREGON GOVERNOR RECENTLY DECLARED A DROUGHT EMERGENCY FOR BAKER
COUNTY...ADDING TO DECLARATIONS FOR HARNEY AND MALHEUR COUNTIES FROM
EARLIER THIS YEAR.

GROUND WATER IS BEING IMPACTED BY LONG TERM DROUGHT WITH OVERALL
DECLINES IN THE SNAKE PLAIN AQUIFER. AQUIFER DECLINES ARE EVIDENT IN
DECREASED REACH GAINS ON THE SNAKE RIVER BETWEEN MILNER AND KING
HILL...IN ADDITION TO FALLING GROUND WATER DEPTHS.

THE LATEST WATER SUPPLY FORECASTS FROM THE NORTHWEST RIVER FORECAST
CENTER INDICATE 60 PERCENT OF AVERAGE OR LOWER RUNOFF VOLUMES FOR
THE MAJORITY OF IDAHO AND SOUTHEAST OREGON FOR APRIL THROUGH
SEPTEMBER. RUNOFF VOLUMES NEAR 15 PERCENT OF AVERAGE ARE FORECAST
FOR PORTIONS OF SOUTHEAST OREGON AND SOUTHWEST IDAHO...CONTRASTING
THE HIGHEST FORECASTS WHICH CALL FOR 75 TO 85 PERCENT OF AVERAGE FOR
PORTIONS OF THE IDAHO PANHANDLE...CENTRAL IDAHO AND THE SNAKE RIVER
HEADWATERS.

ACCORDING TO THE U.S. DEPARTMENT OF AGRICULTURE FARM SERVICE
AGENCY...AS OF APRIL 22 2015...TWIN FALLS COUNTY...OWYHEE COUNTY AND
WASHINGTON COUNTY HAVE BEEN DESIGNATED AS PRIMARY DROUGHT DISASTER
COUNTIES. CONTIGUOUS DROUGHT DISASTER COUNTIES IN IDAHO INCLUDE
ADA...ADAMS...CANYON...CASSIA...ELMORE...GEM...GOODING...JEROME...
PAYETTE AND ONEIDA. IN SOUTHEAST OREGON...BAKER...MALHEUR AND HARNEY
ARE PRIMARY DROUGHT DISASTER COUNTIES.  ANY COUNTY DECLARED A
PRIMARY OR CONTIGUOUS DISASTER COUNTY MAKES PRODUCERS IN THAT COUNTY
ELIGIBLE FOR CERTAIN EMERGENCY AID. SEE THE U.S. DEPARTMENT OF
AGRICULTURE WEB SITE IN THE RELATED WEB SITES SECTION BELOW FOR
DETAILS.

CLIMATE SUMMARY...

AS OF APRIL 23...PRECIPITATION FOR THE 2015 WATER YEAR WAS BELOW
AVERAGE FOR ALMOST ALL OF SOUTHERN IDAHO AND SOUTHEAST OREGON.
PRECIPITATION FOR THE NORTHERN HALF OF IDAHO WAS GENERALLY NEAR
NORMAL.

NRCS SNOTEL DATA AS OF APRIL 23...FOR IDAHO INDICATED 50 TO 65
PERCENT OF MEDIAN SNOWPACK FOR THE CLEARWATER...SALMON...BOISE AND
SNAKE RIVER HEADWATERS BASINS...AND 45 PERCENT OF MEDIAN OR LESS FOR
THE REMAINDER OF IDAHO. SNOWPACK FOR THE OWYHEE BASIN AND SOUTHEAST
OREGON WAS LESS THAN 10 PERCENT OF MEDIAN.

AVERAGE TEMPERATURES OVER THE 60 DAY PERIOD FROM FEBRUARY 23 TO
APRIL 23 WERE GENERALLY 2 TO 5 DEGREES ABOVE AVERAGE ACROSS SOUTHERN
IDAHO AND SOUTHEAST OREGON...AND ABOUT 1 TO 3 DEGREES ABOVE AVERAGE
ACROSS NORTHERN IDAHO.

BELOW IS A LIST OF PRECIPITATION DATA FOR SELECTED LOCATIONS IN
IDAHO AND SOUTHEAST OREGON FOR THE 2015 WATER YEAR.

       OCT 1 2014-APR 23 2015      NORMAL     DEPARTURE    LAST
        TOTAL PRECIP(INCHES)       VALUE     FROM NORMAL   YEAR

BOISE            9.14               8.21        0.93       9.39
MCCALL          15.32              13.34        1.98      16.20
TWIN FALLS       4.41               5.56       -1.15       3.72
POCATELLO        4.13               7.28       -3.15       6.20
IDAHO FALLS      2.30               5.58       -3.28       3.99
CHALLIS          2.86               4.36       -1.50       3.08
STANLEY         12.18              11.29        0.89      14.69
LEWISTON         7.90               7.11        0.79       5.92
BAKER CITY, OR   4.44               5.32       -0.88       4.05
BURNS, OR        6.75               7.52       -0.77       4.91
ROME, OR         3.03               5.31       -2.28       1.62

PRECIPITATION AND TEMPERATURE OUTLOOK...

THE THREE MONTH OUTLOOK FOR MAY THROUGH JULY FAVORS ABOVE NORMAL
TEMPERATURES. PROBABILITIES FAVOR ABOVE NORMAL PRECIPITATION DURING
THE PERIOD...EXCEPT FOR THE IDAHO PANHANDLE WHERE THERE ARE EQUAL
CHANCES OF EITHER ABOVE NORMAL...NORMAL...OR BELOW NORMAL
PRECIPITATION.

HYDROLOGIC SUMMARY...

AS OF APRIL 23...28 DAY AVERAGE STREAMFLOWS AT USGS GAGING STATIONS
ACROSS NORTHERN AND CENTRAL IDAHO...AND THE SNAKE RIVER HEADWATERS
WERE MOSTLY NORMAL OR ABOVE NORMAL. ELSEWHERE...FOR SOUTHERN IDAHO
AND SOUTHEAST OREGON...STREAMFLOWS WERE MOSTLY BELOW NORMAL...WITH A
NUMBER OF STREAMGAGE FLOWS WITHIN THE 10 PERCENTILE CLASS FOR LOW
FLOWS.

MAJOR RESERVOIR SYSTEMS ACROSS IDAHO WERE GENERALLY HOLDING NEAR
AVERAGE OR ABOVE AVERAGE STORAGE. SOME OF THE SMALLER RESERVOIRS IN
SOUTHERN IDAHO WERE ONLY HOLDING ABOUT 60 TO 75 PERCENT OF AVERAGE.
OVERALL RESERVOIR STORAGE IN SOUTHEAST OREGON WAS WELL BELOW
AVERAGE...WITH THE TWO LARGEST RESERVOIRS...OWYHEE AND WARMSPRINGS
...ONLY HOLDING ABOUT 40 PERCENT OF AVERAGE.

APRIL 1 2015 RESERVOIR DATA

                 PERCENT OF CAPACITY     PERCENT OF AVG IDAHO

AMERICAN FALLS           89                     100
ANDERSON RANCH           75                     138
ARROWROCK                97                     139
BEAR LAKE                45                      95
BLACKFOOT                52                      95
BROWNLEE                113                     146
CASCADE                  82                     122
COEUR D ALENE            95                     137
DEADWOOD                 84                     150
DWORSHAK                 93                     133
HENRYS LAKE              99                     110
ISLAND PARK              93                     113
LAKE LOWELL              82                     120
LITTLE WOOD              74                     112
LUCKY PEAK               91                     160
MACKAY                   77                     110
MAGIC                    42                      91
MANN CREEK               93                     118
MONTPELIER               80                     167
OAKLEY                   30                      76
PALISADES                89                     138
PEND OREILLE             48                      98
PRIEST LAKE              84                     148
RIRIE                    66                     118
SALMON FALLS             19                      61

EASTERN OREGON
OWYHEE                   27                      39
WARM SPRINGS             24                      41
BEULAH                   63                      88
BULLY CREEK              52                      66
UNITY                    99                     121
PHILLIPS                 41                      71
THIEF VALLEY             79                      89

NEXT ISSUANCE DATE...

UPDATES TO THIS PRODUCT WILL BE MADE ON A MONTHLY BASIS. THE NEXT
ISSUANCE OF THE DROUGHT INFORMATION STATEMENT WILL OCCUR IN LATE
MAY.

RELATED WEB SITES...

U.S. DROUGHT PORTAL:
HTTP://WWW.DROUGHT.GOV

NATIONAL DROUGHT MITIGATION CENTER:
HTTP://DROUGHT.UNL.EDU

STREAM FLOWS:
AHPS HTTP://WATER.WEATHER.GOV/AHPS
USGS HTTP://WATERWATCH.USGS.GOV

NWS WATER SUPPLY FORECASTS:
HTTP://WWW.NWRFC.NOAA.GOV
HTTP://WWW.CBRFC.NOAA.GOV

NRCS WATER SUPPLY FORECASTS:
HTTP://WWW.WCC.NRCS.USDA.GOV/WSF/WSF.HTML

IDAHO DEPARTMENT OF WATER RESOURCES:
HTTP://WWW.IDWR.IDAHO.GOV

OREGON WATER RESOURCES DEPARTMENT (DROUGHT INFORMATION):
HTTP://WWW.OREGON.GOV/OWRD/PAGES/WR/DROUGHT.ASPX

LONG TERM WEATHER AND CLIMATE OUTLOOKS:
HTTP://WWW.CPC.NCEP.NOAA.GOV

WESTERN REGION CLIMATE CENTER (CLIMATE ANOMALY MAPS):
HTTP://WWW.WRCC.DRI.EDU/MONITORING-MAPS/

NATIONAL INTERAGENCY COORDINATION CENTER
(FIRE DANGER AND OUTLOOKS):  HTTP://WWW.NIFC.GOV/NICC

RESERVOIR INFORMATION:
NRCS
HTTP://WWW.WCC.NRCS.USDA.GOV/WSF/WSF-RESERVOIR.HTML
BUREAU OF RECLAMATION
HTTP://WWW.USBR.GOV/PN/HYDROMET/SELECT.HTML

UNITED STATES DEPARTMENT OF AGRICULTURE:
DISASTER ASSISTANCE
HTTP://WWW.USDA.GOV/WPS/PORTAL/USDA/USDAHOME

ACKNOWLEDGEMENTS...
THE DROUGHT MONITOR IS A MULTI-AGENCY EFFORT INVOLVING NOAA/S
NATIONAL WEATHER SERVICE AND NATIONAL CLIMATIC DATA CENTER...THE
US DEPARTMENT OF AGRICULTURE...STATE AND REGIONAL CENTERS...
CLIMATOLOGISTS...AND THE NATIONAL DROUGHT MITIGATION CENTER.
INFORMATION FOR THIS STATEMENT HAS BEEN GATHERED FROM THE NWS AND
FFA OBSERVATION SITES...STATE AGENCIES...USDA...NRCS...USACE AND
USGS.

QUESTIONS OR COMMENTS...
IF YOU HAVE QUESTIONS OR COMMENTS ABOUT THIS DROUGHT INFORMATION
STATEMENT PLEASE CONTACT...

NATIONAL WEATHER SERVICE
3833 SOUTH DEVELOPMENT AVENUE
BOISE ID 83705-5354
PHONE: 208-334-9860
EMAIL: W-BOI.WEBMASTER@NOAA.GOV

$$


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