Highlights and Updates from the Desert Research Institute Winter 2016 Projects

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1 Highlights and Updates from the Desert Research Institute Winter 2016 Projects Frank McDonough Jeff Dean Jesse Juchtzer Kacie Shourd and Kerwyn Texeira Desert Research Institute Reno, NV 1

2 Three operational programs - Rockies: Winter Park Ski Area, CO - Sierra: Tahoe-Truckee, CA/NV - Sierra: Walker Basin. CA/NV DRI remote AgI generator 2

3 Winter Park CO: Geography Target Continental. Divide 3

4 Winter Park CO: Generator Sites and Target 4

5 Winter Park Summary (through Mar 31) - 44 cloud seeding events total generator hours - Snowfall during seeding events (223 ) - Estimated possible snowfall using 10% augmentation (22.3 ) - Estimated additional water added to watershed (7016 to 7795 acrefeet (AF))* - Program costs $63,000 and generated 7795 AF so about $8/AF. 0.01mm/hr increase in precipitation, 35sq. mi. impacted by seeding plume (Huggins) Photo: Winter Park Resort 5

6 - Difficult location to forecast/nowcast - Radar: No low-level data - Satellite: Cold tops often present Winter Park forecasting - Numerical Model: WRF CAIC (SLW and soundings) - Surface: - Mountain stations (T,RH,Winds) - Kremmling cloud base hgt/temp* - generator weather stations - webcams: cloud base hgt/temp visibility in clouds Webcam icicle ice detector - Icing (SLW): - PIREPS (sometime useful) - webcams on occasion New ceilometer slated for WY2017 6

7 Sierra Projects: Geography Tahoe-Truckee Walker 7

8 Walker Basin Project Desert Terminal Lakes Project Bureau of Reclamation Project Goal: Increase water in Walker Lake reduce salinity and restore fishery 8

9 Walker Basin Project Desert Terminal Lakes Project Bureau of Reclamation Project Goal: Increase water in Walker Lake reduce dissolved solid concentration and restore fishery Walker Laker MSL MSL 1992

10 Walker Basin Project Purchase water rights and cloud seeding to improve stream flow West Walker River Jeffery Pine stumps from mega drought ~ CE 10

11 Walker Basin Project Purchase water rights and cloud seeding to improve stream flow. Drought present though most of project MSL 2016 down 31-ft since 2008.

12 Walker Basin Project WY2016 Mean temperatures above normal for winter

13 Walker Basin Project WY2016 Median SWE/Precip along Sierra Crest

14 Walker Basin Project 4 ground-based generators Aircraft

15 Walker Basin Summary (through Mar 31) Photo: Winter Park Resort - 14 cloud seeding events from ground generator-hours - Snowfall during seeding events - 6 aircraft missions - 14 flight hours - Precipitation augmentation statistics not yet computed 15

16 Walker Basin Numerical Modeling - Example: Assess numerical model microphysics to seeding aircraft pilot reports Moderate icing liquid frozen 16

17 Tahoe-Truckee Project DRI Cloud seeding generator: on (Sierra Crest Seeding operations as far back as 1960 s 17

18 WY 2016 Tahoe-Truckee network CSG 18

19 Tahoe-Truckee Project Summary (thru Mar 31) - 33 cloud seeding events total generator hours - Snowfall during seeding events (not yet calculated) - Estimated possible snowfall using (not yet calculated) - Estimated additional water added to watershed (18,500 acre-feet (AF))* 0.01mm/hr increase in precipitation, 35sq. mi. impacted by seeding plume (Huggins) Tahoe Natural Rim 19

20 Case studies/snow Habit/Snow Chem Ski Ski * KTRK Ski * Ski * * Ski X Ski X X Ski * X KTVL Ski * 20 Ski X

21 Case studies: March 21-22, 2016 Poor man ice detector cost: free From the Squaw Valley/Alpine Meadows web cams on Sierra Crest (10 min data)

22 Case studies: March 21-22, 2016 Looking west towards Sierra Geonor Precip Crystals and snow samples collected :00 UTC Tahoe Donner Brockway Summit Eagle s Nest Mt Rose

23 UAS Cloud Seeder Project funded by State of Nevada Office for Economic Development Partners: Drone America DRI Avisight Drone America Cloud Seeding Test aircraft testing the flare racks Goal: Develop the technology to test the feasibility of using UAS for cloud seeding. Early phase of project: -First test flight scheduled this week. -Design flight tracks -Design validation methods -Working with FAA to permit flight testing locations -First test seeding flight expected this summer into CU over Nevada

24 Thank You! Any questions/comments? 24

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