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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 152158
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-
065-067-071-073-075-077-079-081-083-085-087-160600-

WATER SUPPLY OUTLOOK
NATIONAL WEATHER SERVICE BOISE IDAHO
355 PM MDT TUE APR 15 2014

...IDAHO SPRING FLOOD AND WATER SUPPLY OUTLOOK AS OF APRIL 2014...

...ABOVE AVERAGE SPRING FLOOD RISK FOR THE UPPER SNAKE RIVER AND 
BEAR RIVER REGIONS IN EASTERN IDAHO... 
...AVERAGE SPRING FLOOD RISK FOR NORTH CENTRAL AND NORTHERN IDAHO...
...BELOW AVERAGE SPRING FLOOD RISK FOR MOST OF SOUTH CENTRAL AND 
SOUTHWEST IDAHO...

...NORMAL TO ABOVE NORMAL RUNOFF VOLUMES EXPECTED ACROSS MOST OF 
EASTERN...NORTH CENTRAL...AND NORTHERN IDAHO... 
...BELOW NORMAL RUNOFF VOLUMES EXPECTED ACROSS THE BEAR RIVER 
BASIN...SOUTH CENTRAL AND SOUTHWEST IDAHO...

AS OF MID APRIL...THE RISK OF SPRING FLOODING DUE TO SNOWMELT IS 
ABOVE AVERAGE ACROSS THE UPPER SNAKE AND BEAR RIVER REGIONS OF 
EASTERN IDAHO. FOR NORTH CENTRAL IDAHO AND THE PANHANDLE REGION... 
THE RISK OF SPRING SNOWMELT FLOODING IS NEAR AVERAGE...WHILE 
SOUTHWEST AND MOST OF SOUTH CENTRAL IDAHO HAS A BELOW AVERAGE RISK. 

RESERVOIRS IN THE UPPER SNAKE BASIN...AND CENTRAL AND NORTHERN IDAHO 
ARE GENERALLY IN GOOD SHAPE WITH ADEQUATE SNOWPACK TO EITHER FILL OR 
COME CLOSE TO FILLING...DEPENDING ON RUNOFF TIMING AND IRRIGATION 
DEMAND. FLOWS WILL BE INCREASED OUT OF SOME RESERVOIRS THIS SPRING 
TO ALLOW SPACE FOR SNOWMELT RUNOFF. THIS IS ESPECIALLY TRUE IN THE 
UPPER SNAKE BASIN...WHERE RESERVOIR OPERATIONS MAY PUSH THE MAIN 
STEM SNAKE RIVER TO NEAR BANKFULL FOR A FEW WEEKS FROM HEISE 
DOWNSTREAM TO AMERICAN FALLS. WATER STORAGE IS NOT AS PROMISING FOR 
MUCH OF SOUTHERN IDAHO THOUGH...AS BEAR LAKE...OWYHEE RESERVOIR... 
AND MOST RESERVOIRS IN SOUTH CENTRAL IDAHO ARE NOT EXPECTED TO FILL.

THE PRIMARY FACTORS IN THE DEVELOPMENT OF SPRING RIVER 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.

IT IS NOT ALWAYS POSSIBLE TO FORECAST SPECIFIC RAIN STORMS...RAIN
ON SNOW EVENTS...OR EXTREME TEMPERATURE EVENTS MORE THAN 4 TO 7
DAYS INTO THE FUTURE. THEREFORE...SHORT RANGE RIVER FORECASTS
SHOULD BE MONITORED CLOSELY. DETAILS REGARDING POSSIBLE OR
RESULTING FLOODING WILL BE AVAILABLE IN SHORT TERM OUTLOOKS...FLOOD
WATCHES AND FLOOD WARNINGS ISSUED BY THE NATIONAL WEATHER SERVICE. 

THE NATIONAL WEATHER SERVICE WATER SUPPLY OUTLOOK FOR IDAHO FOR THE 
2014 WATER YEAR PROJECTS NEAR AVERAGE TO ABOVE AVERAGE RUNOFF 
VOLUMES FOR THE PANHANDLE REGION...THE CLEARWATER...SALMON...AND 
PAYETTE RIVER AREAS...AS WELL AS THE UPPER SNAKE RIVER. ELSEWHERE... 
THE OUTLOOK IS NOT AS PROMISING...WITH BELOW AVERAGE RUNOFF VOLUMES 
EXPECTED. PORTIONS OF THE MAGIC VALLEY...AND SOUTH CENTRAL AND 
SOUTHWEST IDAHO BASINS NEAR THE NEVADA BORDER HAVE BEEN THE 
DRIEST...WITH WATER SUPPLY FORECASTS INDICATING AROUND 50 PERCENT OR 
LESS OF NORMAL RUNOFF. FORECASTS ON THE SNAKE RIVER BELOW AMERICAN 
FALLS DAM INDICATE ABOUT 60 TO 70 PERCENT OF NORMAL RUNOFF VOLUMES. 

SUMMARY OF 2014 WATER YEAR...

THE 2014 WATER YEAR STARTED OFF VERY DRY ACROSS IDAHO. JANUARY 
MARKED THE FOURTH CONSECUTIVE MONTH THAT BELOW NORMAL PRECIPITATION 
OCCURRED ACROSS ALMOST THE ENTIRE STATE. AT THE END OF JANUARY...
WITH EXCEPTION OF THE CLEARWATER BASIN AND EXTREME SOUTHEAST IDAHO
...WATER YEAR PRECIPITATION WAS LESS THAN LESS THAN 75 PERCENT OF 
NORMAL ACROSS THE STATE...AND MUCH OF SOUTH CENTRAL AND SOUTHWEST 
IDAHO HAD ONLY RECEIVED ABOUT 50 PERCENT OF NORMAL. THE WEATHER 
PATTERN RESPONSIBLE FOR THE PERSISTENT DRYNESS FINALLY GAVE WAY TO A 
MOIST WESTERLY FLOW OFF THE PACIFIC OCEAN...WHICH DOMINATED THROUGH 
FEBRUARY AND MARCH. THE RESULT WAS BACK TO BACK MONTHS OF WELL ABOVE 
NORMAL PRECIPITATION FOR MOST OF THE STATE. FEBRUARY PRECIPITATION 
WAS OVER 130 PERCENT OF NORMAL FOR MOST AREAS...AND MUCH OF THE 
MOUNTAINS RECEIVED 200 TO 300 PERCENT OF NORMAL. MARCH PRECIPITATION 
WAS NEARLY AS IMPRESSIVE...EXCEPT FOR PORTIONS OF THE LOST AND WOOD 
RIVER BASINS IN SOUTHERN IDAHO WHICH RECEIVED BELOW NORMAL 
PRECIPITATION. 

THE FIRST HALF OF APRIL WAS RATHER DRY ACROSS IDAHO. MUCH OF SOUTH 
CENTRAL AND SOUTHWEST IDAHO STILL SUFFER FROM LONG TERM DRYNESS AND 
ARE FACING WATER SUPPLY SHORTAGES DURING THE GROWING SEASON. THUS... 
COOL AND WET CONDITIONS THE REST OF SPRING WOULD BE VERY BENEFICIAL 
AND EASE DROUGHT AND WATER SUPPLY CONCERNS IN THESE AREAS. 

REFER TO SECTIONS BELOW AND LINKS PROVIDED FOR THE LATEST DETAILS
REGARDING WATER SUPPLY FORECASTS FOR SPECIFIC LOCATIONS...SNOWPACK
...PRECIPITATION...RESERVOIR CONDITIONS AND LONG TERM WEATHER
OUTLOOKS.

WATER SUPPLY VOLUME FORECASTS...

WATER SUPPLY FORECASTS ISSUED BY THE NORTHWEST AND COLORADO BASIN 
RIVER FORECAST CENTERS ARE ISSUED FREQUENTLY...ON EITHER A WEEKLY
OR DAILY BASIS. FOR THE LATEST WATER SUPPLY FORECASTS FOR IDAHO
PLEASE REFER TO THE FOLLOWING WEB SITES.

NATIONAL WEATHER SERVICE-NORTHWEST RIVER FORECAST CENTER
WWW.NWRFC.NOAA.GOV/WS/

NATIONAL WEATHER SERVICE-COLORADO BASIN RIVER FORECAST CENTER
(BEAR RIVER BASIN) 
HTTP://WWW.CBRFC.NOAA.GOV/

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

SNOWPACK INFORMATION...
 
AS OF APRIL 15...BASIN SNOWPACK VARIED CONSIDERABLY ACROSS IDAHO. 
THE LOWEST PERCENTAGES WERE ACROSS FAR SOUTHWEST IDAHO...WITH THE 
OWYHEE BASIN AT ONLY 45 PERCENT OF NORMAL. MEANWHILE...THE 
CLEARWATER...UPPER SNAKE...AND BEAR RIVER BASIS WERE THE HIGHEST... 
RANGING FROM 130 TO 150 PERCENT OF NORMAL. THE BULK OF THE SNOWPACK 
RESIDES AT THE HIGH ELEVATIONS...AS LOW ELEVATION...AND MUCH OF THE 
MID ELEVATION SNOW HAS ALREADY MELTED. 

CURRENT DAY SNOW WATER EQUIVALENT AND PERCENT OF NORMAL SNOWPACK 
INFORMATION CAN BE FOUND AT THE FOLLOWING LINKS.

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

NATIONAL WEATHER SERVICE-NATIONAL OPERATIONAL HYDROLOGIC REMOTE 
SENSING CENTER 
HTTP://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/CGIBIN/RESV-GRAPH.PL?STATE=ID

DROUGHT CONDITIONS

ACCORDING TO THE U.S. DROUGHT MONITOR...AS OF APRIL 8...MODERATE TO 
EXTREME DROUGHT CONDITIONS EXIST ACROSS MOST OF SOUTHERN IDAHO. 
PROLONGED DROUGHT CONDITIONS LAST YEAR...AND THROUGH THE FIRST 
SEVERAL MONTHS OF THE CURRENT WATER YEAR...HAVE HAD LONG TERM 
IMPACTS ON RESERVOIR STORAGE AND WATER SUPPLY FOR SOUTHERN IDAHO. 
THE 90 DAY U.S. SEASONAL DROUGHT OUTLOOK INDICATES A POSSIBLE 
REMOVAL OR RELAXATION OF THE DROUGHT INTENSITY IN ALL OF EASTERN 
IDAHO AND THE CENTRAL MOUNTAINS. 
 
FOR THE LATEST DROUGHT CONDITIONS ACROSS THE REGION PLEASE REFER TO 
THE FOLLOWING WEB SITES.

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

U.S. DROUGHT MONITOR
HTTP://WWW.DROUGHTMONITOR.UNL.EDU/

NATIONAL DROUGHT MITIGATION CENTER
HTTP://DROUGHT.UNL.EDU/
  
PEAK FLOW FORECASTS...

FOR PEAK FLOW FORECASTS PLEASE REFER TO THE FOLLOWING WEB SITES.

NORTHWEST RIVER FORECAST CENTER PEAK FLOW
HTTP://WWW.NWRFC.NOAA.GOV/PEAK/

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

TEMPERATURE AND PRECIPITATION OUTLOOK...

ACCORDING TO THE CLIMATE PREDICTION CENTER...THE LONG RANGE OUTLOOK 
FOR MAY THROUGH JULY FAVORS ABOVE NORMAL TEMPERATURES ACROSS 
SOUTHWEST IDAHO...AND EQUAL CHANCES OF BELOW AVERAGE...AVERAGE OR 
ABOVE AVERAGE TEMPERATURES ACROSS NORTHERN AND EASTERN IDAHO. FOR 
PRECIPITATION DURING THE MAY THROUGH JULY PERIOD...THERE ARE EQUAL 
CHANCES OF BELOW AVERAGE...AVERAGE...OR ABOVE AVERAGE PRECIPITATION 
ACROSS THE STATE. 

THE NATIONAL WEATHER SERVICE CLIMATE PREDICTION CENTER HAS ISSUED AN 
EL NINO WATCH...INDICATING ABOUT A 50 PERCENT CHANCE OF EL NINO
DEVELOPING DURING THE SUMMER OR FALL OF 2014. TYPICAL WINTER TIME
IMPACTS OF EL NINO ON IDAHO WEATHER ARE FOR WARMER THAN NORMAL
TEMPERATURES AND BELOW NORMAL SNOWPACK.

FOR EL NINO INFORMATION AND LONG RANGE AND SEASONAL OUTLOOKS ISSUED 
BY THE NATIONAL WEATHER SERVICE CLIMATE PREDICTION CENTER PLEASE 
REFER TO THE FOLLOWING WEBSITE.
WWW.CPC.NCEP.NOAA.GOV/

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