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Weather for Boise, Idaho

Lat: 43.61N, Lon: 116.23W
Wx Zone: IDZ014 CWA Used: BOI

Idaho Drought Monitor

The Idaho Drought monitor is a subset of the United States Monitor, issued every Thursday morning, based on drought conditions the previous Tuesday. The map below shows the current drought level around the state, and the percent of Idaho land area in each drought level compared to the previous week.

Read an explanation of the drought intensities and what they mean.

Idaho Drought Monitor

Idaho Hydrologic Information Statement

Note that if drought conditions are not being experienced, or in the case of river flooding or heavy rain, this statement may be used to indicate river flows or flood potential.

000
FGUS75 KBOI 051856 CCA
ESFBOI

FGUS75 KBOI DDHHMM
ESFBOI

FGUS75 KBOI DDHHMM
ESFBOI
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-
065-067-069-071-073-075-077-079-081-083-085-087-080700-

WATER SUPPLY OUTLOOK...CORRECTED
NATIONAL WEATHER SERVICE BOISE IDAHO
1155 AM MST THU MAR 5 2015

...IDAHO SPRING FLOOD AND WATER RESOURCES OUTLOOK...

...SPRING FLOOD RISK IS AVERAGE FOR THE SNAKE RIVER HEADWATERS 
REGION...AND BELOW AVERAGE ELSEWHERE IN IDAHO...

...AVERAGE TO BELOW AVERAGE RUNOFF VOLUMES EXPECTED ACROSS IDAHO...
 
ABOVE NORMAL TEMPERATURES HAVE DOMINATED ACROSS IDAHO THROUGH THE 
WINTER MONTHS. MUCH OF THE WINTER PRECIPITATION HAS FALLEN AS RAIN 
INSTEAD OF SNOW...ESPECIALLY AT MID AND LOW ELEVATIONS. THE 
RELATIVELY WARM WEATHER HAS ALSO CAUSED MUCH OF THE MID AND LOW 
ELEVATION SNOWPACK TO ALREADY MELT. AS A RESULT...BELOW AVERAGE 
SNOWPACK EXISTS ACROSS MOST OF IDAHO. AT THIS TIME...THE THREAT OF 
SPRING FLOODING DUE TO SNOWMELT IN IDAHO IS NEAR AVERAGE FOR THE 
SNAKE RIVER HEADWATERS AREA...AND BELOW AVERAGE ELSEWHERE ACROSS THE 
STATE. 

ONE THING TO REMEMBER IS THAT OUR MOUNTAIN SNOWPACK TYPICALLY PEAKS 
IN EARLY APRIL...LEAVING SEVERAL WEEKS TO POTENTIALLY BOOST OUR 
SNOWPACK AND CHANGE THE FLOOD POTENTIAL. 

THE PRIMARY FACTORS IN THE DEVELOPMENT OF SPRING FLOODING ARE THE 
OCCURRENCE OF PERSISTENT ABOVE NORMAL TEMPERATURES...AND RAIN ON 
SNOW PRECIPITATION EVENTS. EVEN FOR AREAS WHERE DROUGHT CONDITIONS 
EXIST...OR THAT HAVE LOW SNOWPACK...SPRING FLOODING IS POSSIBLE 
UNDER THE RIGHT SCENARIO. ADDITIONALLY...BURN SCARS CAN HAVE A 
SIGNIFICANT IMPACT ON LOCAL FLOOD POTENTIAL DURING SPRING SNOWMELT.

WATER SUPPLY...

NATIONAL WEATHER SERVICE WATER SUPPLY FORECASTS FOR THE THE 2015 
WATER YEAR VARY CONSIDERABLY FROM REGION TO REGION ACROSS IDAHO. FOR 
PORTIONS OF EASTERN AND CENTRAL IDAHO WHERE THE BETTER SNOWPACK 
EXISTS...FORECASTS INDICATE AVERAGE OR A LITTLE BELOW AVERAGE RUNOFF 
VOLUMES FOR THE APRIL THROUGH SEPTEMBER PERIOD. ELSEWHERE... 
FORECASTS GENERALLY SHOW BELOW OR WELL BELOW AVERAGE RUNOFF VOLUMES. 
SOUTHWEST IDAHO SOUTHSIDE SNAKE RIVER BASINS HAVE THE LOWEST 
FORECAST PERCENTAGES...NEAR 50 PERCENT OF AVERAGE OR LESS. 

SNOWPACK...

AS OF MARCH 5...SNOWPACK VARIED CONSIDERABLY ACROSS IDAHO. THE 
LOWEST SNOWPACK PERCENTAGES WERE ACROSS SOUTHWEST AND WEST CENTRAL 
IDAHO IN THE OWYHEE AND WEISER BASINS...AT 28 AND 43 PERCENT OF 
MEDIAN. THE PANHANDLE AND SPOKANE BASINS IN NORTHERN IDAHO HAVE NOT 
FARED MUCH BETTER...SITTING NEAR 50 PERCENT OF MEDIAN. THE HIGHEST 
PERCENTAGES WERE AROUND 85 TO 100 PERCENT OF MEDIAN IN THE SNAKE 
RIVER HEADWATERS REGION...SALMON BASIN...LITTLE LOST AND BIRCH 
BASINS...GOOSE CREEK AND OAKLEY BASINS. THE REMAINDER OF IDAHO 
BASINS WERE ABOUT 65 TO 80 PERCENT OF MEDIAN.  

RESERVOIRS...

MAJOR RESERVOIR SYSTEMS ACROSS IDAHO WERE GENERALLY HOLDING NEAR OR 
ABOVE AVERAGE STORAGE. A FEW OF THE SMALLER RESERVOIRS IN SOUTHERN 
IDAHO WERE ONLY HOLDING ABOUT 60 TO 80 PERCENT OF AVERAGE. MOST OF 
THE LARGE RESERVOIR SYSTEMS ARE LIKELY TO FILL OR COME CLOSE TO 
FILLING. HOWEVER...THE OWYHEE BASIN CONTINUES TO SUFFER FROM 
CONSECUTIVE YEARS OF DROUGHT AND OWYHEE RESERVOIR STORAGE WILL 
LIKELY REMAIN FAR BELOW AVERAGE. WEATHER PATTERNS AND IRRIGATION 
DEMAND WILL DRIVE RESERVOIR OPERATIONS OVER THE NEXT SEVERAL MONTHS. 
WET SPRING WEATHER OR EXTENDED PERIODS OF WARMTH RESULTING IN RAPID 
SNOWMELT COULD RESULT IN SIGNIFICANT INCREASES IN RESERVOIR OUTFLOWS 
AND RIVER LEVELS. 

DROUGHT...

ACCORDING TO THE U.S. DROUGHT MONITOR AS OF MARCH 3...IN SOUTHERN 
IDAHO MODERATE TO SEVERE DROUGHT EXISTS ACROSS MUCH OF THE UPPER 
SNAKE PLAIN...THE WOOD RIVER AND LOST RIVER BASINS...ACROSS SOUTH 
CENTRAL IDAHO AND OWYHEE COUNTY...EXTENDING NORTH NEAR THE OREGON 
BORDER ACROSS WESTERN WASHINGTON AND WESTERN ADAMS COUNTIES. EXTREME 
DROUGHT EXISTS ACROSS FAR WESTERN OWYHEE COUNTY AND FAR SOUTHWEST 
WASHINGTON COUNTY. PROLONGED DROUGHT CONDITIONS IN THESE AREAS HAVE 
LEFT LONG TERM IMPACTS ON GROUND WATER...STREAMFLOWS...AND STORAGE 
IN SOME RESERVOIRS. THE 90 DAY U.S. SEASONAL DROUGHT OUTLOOK 
INDICATES DROUGHT CONDITIONS ARE LIKELY TO PERSIST IN THESE AREAS 
THROUGH SPRING.

LONG RANGE OUTLOOK...

THE OUTLOOK FOR MARCH FAVORS ABOVE NORMAL TEMPERATURES ACROSS 
IDAHO...AND EQUAL CHANCES OF EITHER BELOW AVERAGE...AVERAGE...OR 
ABOVE AVERAGE PRECIPITATION. FOR THE APRIL THROUGH JUNE 
PERIOD...ABOVE NORMAL TEMPERATURES ARE ONCE AGAIN FAVORED...WITH 
EQUAL CHANCES OF BELOW AVERAGE...AVERAGE...OR ABOVE AVERAGE 
PRECIPITATION. 

REFER TO THE LINKS PROVIDED BELOW FOR THE LATEST INFORMATION ON 
WATER RESOURCES.

WATER SUPPLY VOLUME FORECASTS... 
NATIONAL WEATHER SERVICE-NORTHWEST 
RIVER FORECAST CENTER HTTP://WWW.NWRFC.NOAA.GOV/WS/

NATIONAL WEATHER SERVICE-COLORADO BASIN RIVER FORECAST CENTER
WWW.CBRFC.NOAA.GOV/

USDA-NATURAL RESOURCES CONSERVATION SERVICE
WWW.NRCS.USDA.GOV/WPS/PORTAL/NRCS/MAIN/ID/SNOW/

SNOWPACK INFORMATION... 
NATIONAL WEATHER SERVICE-NORTHWEST RIVER 
FORECAST CENTER WWW.NWRFC.NOAA.GOV/SNOW/

NATIONAL WEATHER SERVICE-NATIONAL OPERATIONAL HYDROLOGIC REMOTE 
SENSING CENTER 
WWW.NOHRSC.NOAA.GOV/

USDA-NATURAL RESOURCES CONSERVATION SERVICE
WWW.ID.NRCS.USDA.GOV/SNOW/DATA/CURRENT.HTML

RESERVOIR STORAGE... 
BUREAU OF RECLAMATION RESERVOIR STORAGE 
WWW.USBR.GOV/PN/HYDROMET/SELECT.HTML

USDA-NATURAL RESOURCES CONSERVATION SERVICE
WWW.WCC.NRCS.USDA.GOV/BASIN.HTML

DROUGHT CONDITIONS...
U.S. DROUGHT PORTAL WWW.DROUGHT.GOV

U.S. DROUGHT MONITOR
WWW.DROUGHTMONITOR.UNL.EDU/
  
PEAK FLOW FORECASTS...
NORTHWEST RIVER FORECAST CENTER PEAK FLOW
WWW.NWRFC.NOAA.GOV/PEAK/

COLORADO BASIN RIVER FORECAST CENTER PEAK FLOW
WWW.CBRFC.NOAA.GOV/RMAP/PEAK/PEAKLIST.PHP

TEMPERATURE AND PRECIPITATION OUTLOOK...
CLIMATE PREDICTION CENTER WWW.CPC.NCEP.NOAA.GOV/

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