Drought Information Statement
Issued by NWS Boise, ID
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000 AXUS75 KBOI 242118 DGTBOI AXUS75 KBOI DDHHMM DGTBOI 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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National Weather Service
Boise Weather Forecast Office
NIFC Building 3807
Boise, ID 83705-5354
(208) 334-9860
Page last modified: 24-Apr-2015 9:18 PM
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