Idaho Water Supply Committee March 16, 2012 Rain on snow Pine Creek Pass ~6,700 ft (between Idaho Falls & Victor) April 12, 2012 Jeff Anderson NRCS Snow.

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Presentation transcript:

Idaho Water Supply Committee March 16, 2012 Rain on snow Pine Creek Pass ~6,700 ft (between Idaho Falls & Victor) April 12, 2012 Jeff Anderson NRCS Snow Survey March Precipitation % of Normal

SNOTEL Month to Date Precipitation % of Normal March 2012

SNOTEL Month to Date Precipitation % of Normal March 2012March 2011

SNOTEL 14-Day Average Temperature Anomalies March 1-14March 15-29March 30-April 12

SNOTEL Maximum Temperature Records Monday Apr 9, 2012 Tuesday Apr 10, 2012

SNOTEL Maximum Temperature Anomaly Tuesday Apr 10, 2012 Monday Apr 9, 2012

Mountain Snowpack Change between March 1 and April 1, 2012 Big Lost +34% Priest +29% Payette+23% Little Wood+22% Salmon+19% Big Wood+16% Little Lost+16% Weiser+10% Boise+ 6% Henrys Fk+ 3% Teton- 2% Snake above Pal- 6% Goose/Trapper-12% Salmon Falls-15% Bear-15% Owyhee-20% Bruneau-21% Blackfoot-22%

Compare to March 1 to April 1, 2011 SWE % increased statewide from 6-38%

Mountain Snowpack Change between March 1 and April 1, 2012 Big Lost +34% Priest +29% Payette+23% Little Wood+22% Salmon+19% Big Wood+16% Little Lost+16% Weiser+10% Boise+ 6% Henrys Fk+ 3% Teton- 2% Snake above Pal- 6% Goose/Trapper-12% Salmon Falls-15% Bear-15% Owyhee-20% Bruneau-21% Blackfoot-22%

March 16, 2012 Rain on snow Pine Creek Pass ~6,700 ft (between Idaho Falls & Victor)

Otherwise 32F top to bottom Top 2” were ~32.5F due to liquid water Idaho State University Hydrology Field Day at Pine Creek Pass SNOTEL

+6 days with temps above freezing Rain =0.6” Snowmelt =1.0” Total runoff =1.6” 17 sites saw snow melt begin in mid-March

Pine Creek Pass SNOTEL Water Year 2012 Melt starts ~2 weeks ahead of normal

10 sites have melted out 75 sites had >0.3” SWE melt between Apr 8-11 th 3 SNOTELs >9,000ft with >1” melt this week Current Idaho and Upper Snake SNOTEL Snowmelt Status (based on 104 sites)

April 5, 2012 SAMUELS — A 60-foot-wide section of the forest road washed out on Friday, rendering it impassible to vehicles. Panhandle Bonners County Daily Bee

SNOTEL Month to Date Precipitation % of Normal As of April 11, 2012

Boise Basin Statesman Jackson Kayak

sunvalley.com Big Wood March 21, 2012

Big Wood April 12, 2012 sunvalley.com

March +16%

Big Lost March 15, 2012

Upper Snake Basin March 21, ,668ft elev

Upper Snake Basin April 12, ,668ft elev

Snake River Station Water Year ,900ft at Yellowstone South Entrance Melt starts ~3 weeks ahead of normal

Snake at Heise Apr-Sep 50% forecast March 1, ,830 KAF92%

Snake at Heise Apr-Sep 50% Forecast March 1, ,830 KAF92% April 1, ,290 KAF79% Difference 540 KAF -13%

Bear Lake March 17, 2012 Jason Allen

Oakley Reservoir August 2011 Lynn Sessions March 31, KAF August 31, KAF

Jan kaf Jun kaf Mar kaf Salmon Falls January 2012

Owyhees Looking west towards Owyhee Reservoir from Succor Creek area Steve Stuebner

April 3, 2012 Owyhee / Malheur Aerial Snow Course Flight Found 17 or 19 markers snow free

Reservoir Storage as of March 31, 2012 was 624 KAF