1. Basin Conditions River Forecasts Water Supply CBRFC April 2009 Water Supply Webinar 1:00pm MDT, April 8, 2009 William B. Reed

2. Outline March Weather Review April 7 th Snow States Weather Forecast April 1 st Water Supply Forecasts Web Reference: www.cbrfc.noaa.gov/wsup/pub2/map/html/cbrfc.4.2009.html

3. Web Reference: http://www.cbrfc.noaa.gov/precip/qpe/mapsum/mapsum.cgi??cbrfc?M?2009?03

4. Web Reference: http://www.cbrfc.noaa.gov/gmap/gmap.php Slightly Improved Conditions The Same Or Drier Conditions March 1 st to April 7th Passed Seasonal Snow Peak

5. Change between March 1 st & April 7 th March April In general, the snow conditions have slightly improved in the Northern Basins, less 75-90 more 90-110. About the same in headwaters of the San Juan River Basin. Drier in the Virgin River Basin.

6. Web Reference: http://www.cbrfc.noaa.gov/snow/station/sweplot/sweplot.cgi?LOPW4+KNDW4+NFLW4+EKPW4+TRPW4+GRVW4-Green+-+abv+Fontenelle?avg.2009.2008 2000 is closest using peak to date, a dry year (flow for 2000 is ranked 14th lowest out of 51 years) Green - above Fontenelle Reservoir (lopw4 kndw4 nflw4 ekpw4 trpw4 grvw4) April 7th

7. Web Reference: http://www.cbrfc.noaa.gov/snow/station/sweplot/sweplot.cgi?yrList=avg&yrList=2009&yrList=2008&stationList=EKPW4&stationList=GRVW4&stationList=KNDW4&stationLi st=LOPW4&stationList=NFLW4&stationList=TRPW4&monly=0&tavg=s&hsim=sknn&index=&dbsvr=&indextitle=Green+ Green - above Fontenelle Reservoir (lopw4 kndw4 nflw4 ekpw4 trpw4 grvw4) Can zoom in. Also looking at the above plot we can see 2009 is not that different from 2008 (flow for 2008 is ranked 18th lowest out of 51 years). April 7th

8. Web Reference: http://www.cbrfc.noaa.gov/snow/station/sweplot/sweplot.cgi?BLSC2+WLLC2+LKIC2+PHTC2+SCSC2+AROC2+BTSC2+HOOC2+CPMC2+SUMC2+FMTC2+VLMC2+IVHC 2+KLNC2+IDPC2+SOSC2+NLSC2+MESC2-Upper+Colorado+Mainstem?avg.2009.2008 April 7th Currently snow falls between average and 2008. Upper Colorado Mainstem

9. Web Reference: http://www.cbrfc.noaa.gov/snow/station/sweplot/png/trlu1+llku1+hfku1.07-17-avg.2009.2008.0.s.0.png Bear River April 7th Currently snow is average and just a little less than 2008.

10. Last 14 days… Web Reference: http://water.weather.gov

11. Last 7 days… Web Reference: http://water.weather.gov Since April 1 st CBRFC has received precipitation…but these amounts have only been above normal in a few areas. However, significant precipitation has fallen in a few headwater areas.

12. Forecast Precipitation Web References: www.hpc.noaa.gov and www.cpc.noaa.govwww.hpc.noaa.gov

13. Web Reference: http://www.cbrfc.noaa.gov/climate/climoForecasts.cgi

14. Basin Conditions River Forecasts Water Supply Green River Basin - Water Supply Forecasts

15. Both the Upper Green and Yampa/White Basin Forecasts have essentially remained the same from March to April.

16. Both the Duchesne and Lower Green Basin Forecasts have dropped slightly from March to April.

17. Basin Conditions River Forecasts Water Supply Upper Colorado - Water Supply Forecasts

18. Both the Upper Colorado Mainstem and Gunnison Basin Forecasts have dropped slightly from March to April.

19. Web Reference: http://www.cbrfc.noaa.gov/wsup/pub2/graph/png/do.cond.2009.4 Water Year Precipitation, SWE, and Forecast have the same general pattern.

20. Basin Conditions River Forecasts Water Supply San Juan Basin - Water Supply Forecasts

21. Web Reference: http://www.cbrfc.noaa.gov/wsup/pub2/graph/png/sj.cond.2009.4 Forecasts dropped slightly from March to April.

22. Basin Conditions River Forecasts Water Supply Great Salt Lake - Water Supply Forecasts

23. Both the Bear and Lower Weber Basin Forecasts have increased slightly from March to April.

24. Both the Six Creeks and Utah Lake Basin Forecasts have increased slightly from March to April.

25. Basin Conditions River Forecasts Water Supply Sevier Basin - Water Supply Forecasts

26. Web Reference: http://www.cbrfc.noaa.gov/wsup/pub2/graph/png/sv.cond.2009.4 Forecasts dropped slightly from March to April.

27. Basin Conditions River Forecasts Water Supply Lower Colorado - Water Supply Forecasts

28. Web Reference: http://www.cbrfc.noaa.gov/wsup/pub2/graph/png/vg.cond.2009.4 Forecasts dropped slightly from March to April.

29. Web Reference: http://www.nwrfc.noaa.gov/westernwater/ Yampa River Basin has forecasts that fall in the range of 110 -130 % of average.

30. Web Reference: http://www.nwrfc.noaa.gov/westernwater/?page=evolution&id=WBRW4&per=4-7 245 kaf @ 92%

31. Web Reference: http://www.nwrfc.noaa.gov/westernwater/index.php?id=BMDC2&page=evolution&sendme=y 690 kaf @ 96 %

32. Web Reference: http://www.nwrfc.noaa.gov/westernwater/index.php?id=&mapcenter=&mapzoom=&mapcheck=n&cfore=for&cforetype=mean&fdate=2009-04-01 Click on a point. Then click view evolution plot.

33. Web Reference: http://www.nwrfc.noaa.gov/westernwater/index.php?page=evolution&id=GLDA3

34. Colorado at Lake Powell, Glen Cyn Dam, At, Arizona (GLDA3 - CBRFC)

35. Online Publication Web Reference: www.cbrfc.noaa.gov/wsup/pub2/map/html/cbrfc.4.2009.html

36. Basin Conditions River Forecasts Water Supply Aspinall Unit Operations and Colorado Water Supply Meeting USBR Grand Junction Office Thursday, April 23 rd, 2009 9:30 AM – 5:00 PM Hosted by: United States Bureau of Reclamation National Weather Service Forecast Office Colorado Basin River Forecast Center

37. Basin Conditions River Forecasts Water Supply More Resources www.cbrfc.noaa.gov www.nwrfc.noaa.gov/westernwater Next April webinars: –Peak Flow Forecasts: 10am, April 9, 2009 May webinars –Water Supply: 1pm, May 7, 2009 –Peak Flow Forecasts: 10am, May 12, 2009

38. Bill Reed Senior Hydrologist, CBRFC Phone: 801.524.5130 Email: bill.reed@noaa.govbill.reed@noaa Feedback, Questions, Concerns always welcome….