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V*J Ir In I.- I U r-A Return if not delivered UNITED STATES DEPARTMENT OF ACIRICULTURE 001801 SOIL CONSERVATION SERVICE U d States SNOW SURVEY UNIT nite 2490 WEST 26TH AVE. Department of DENVER,COLORADO-80211 Agriculture OFFICIAL BUSINESS USDA-SCS COLORADO AND PENALTY FOR PRIVATE USE,$300 DENVER,COLORADO PERMIT NO.G-267 Conservation Service Denver, Colorado NEW M. EXICO li�60 W,� A TE R SUPPL Y OUTLOOK STREAMFLOW FORECAST AS OF 111111111111 GREEN FEBRUARY 1 1984 ........... R 7 ki, 40" `;p`M1141,111" .............. m _tq ', V, 0,11C K LEGEND Forecast Point 011; .. ...... Watershed ... .............. Boundaries h _7 1k �,'3z�d A STREAMFLOW FORECASTS �,q Percent of 1961-80 Average Over 1309/6 110-1300/6 M ff."If*""i 90-110/0 m 4, V 70- 909/6 R . ......... P N Under 70% #Z i 01�1 P Th7e"map on this pate Indicates the most probable water supp�y as of the date of this report. Estimates 01% assume average conditions of snow fall precipitation and other factors from this date to the end of the fore- V� _!R n' accuracy of estimates improve. In addition to expected strearriflow, cast period. As the season progresses reservoir storage, soil moisture in irrigated-areas, and other factors are considered in estimating water sup- ply. Estimates app!y to irrigated areas along the main streams and may not indicate conditions on small tributaries. Ddte: February 1, 1984 WATER SUPPLY CONDITIONS as of SURFACE WATER SUPPLY INDEX February 1, 1984 SNOW COURSE MEASUREMENTS TAKEN THE LAST WEEK OF JANUARY INDICATE A SUBSTAN— YAMPA-WHITE N. PLATTE TIAL DECREASE IN MOUNTAIN SNOWPACK STATISTICS. THIS WAS DUE TO BELOW NORMAL SOUTH PLATTE PRECIPITATION OVER MUCH OF COLORADO AND NORTHERN NEW MEXICO DURING JANUARY. EVEN major rivers THOUGH PRECIPITATION WAS LIGHT FOR THE MONTH, SNOWPACK STATISTICS REMAIN WELL losin boundaries Fx_71 Surface Water ABOVE AVERAGE FOR THIS TIME OF YEAR* TWENTY-FOUR SNOW COURSES MEASURED IN or I Supply Index COLORADO HAVE NEW MAXIMUMS ON RECORD, AND THREE HAVE TIED THE OLD RECORD. IN co ire FT.471 SCALE NORTHERN NEW MEXICO FIVE NEW MAXIMUMS ON RECORD WERE SET. EXPECTED SNOWMELT RUN— COLORADO +4 abundant supply +2 near normal OFF VOLUMES HAVE DECREASED 10 TO 15% FROM THE FORECASTS MADE J&NUARY 1 IN -2 1 N GUNNISON -3 1 moderate drought COLORADO. STREAMFLOW VOLUMES IN NEW MEXICO RANGE FROM NEAR AVERAGE TO MUCH ABOVE -4 r—severe drought extreme drought AVERAGE. ALL FORECASTS ARE A JOINT EFFORT OF THE SOIL CONSERVATION-SERVICE AND ARKANSAS i4v* THE NATIONAL WEATHER SERVICE. W 14 �W`COLORADO ).4 RIO GRANDE STATEWIDE SNOWPACK IS CURRENTLY 147% OF AVERAGE, DOWN FROM 27,671 L;��THE RECORD BREAKING JANUARY 1 READING OF 207%. THIS IS 171% OF LAST r -EAR. THREE MAJOR DRAINAGE BASINS HAVE SNOWPACK STATISTICS OVER 160% OF AVERAGE, AND ARE THE ARKANSAS, COLORADO, AND GUNNISON RIVER BASINS. EXPECTED APRIL- SAN JUXN DOLORES SEPTEMBER STREAMFLOW VOLUMES RANGE FROM A LOW OF 120% OF AVERAGE ON THE SOUTH COLORADO PLATTE AT SOUTH PLATTE, TO A HIGH OF 183% OF AVERAGE FOR THE GUNNISON RIVER NEAR The Surface Water Supply Index (SWSI) is a weighted value derived for each GRAND JUNCTION. STATEWIDE RESERVOIR STORAGE IS CURRENTLY 59% ABOVE AVERAGE major basin which generally expresses the potential availability of the COMPARED TO 40% ABOVE AVERAGE LAST YEAR. forthcoming season's water supply. The components used in computing the index are reservoir storage, snowpack water equivalent, and precipitation. NEW MEXICO STATEWIDE SNOWPACK IS CURRENTLY 167% OF AVERAGE AND The SWSI number for each basin ranges from a -4.00 (prospective water supplies extremely poor) to a +4.00 (prospective water supplies plentiful) . The SWSI number is only a general indicator of surface water supply condi- 1381% OF LAST YEAR. THIS IS DOWN FROM 246% OF AVERAGE FOR JANUARY 1, 1984. LOW tions. Further data analyses may be required in specific situations to more ELEVATION PRECIPITATION RANGED FROM 21% OF AVERAGE AT CUBA FOR A LOW, TO A HIGH fully understand the impacts of abnormally dry or wet conditions suggested by the SWSI. Development of the SWSI has been a cooperative effort between the Colorado State Engineers' Office and the Soil Conservation Service. OF 150% OF AVERAGE AT CANJILON RANGER STATION FOR THE MONTH. SEASONAL TOTALS ARE NOW GENERALLY NEAR NORMAL. AN EXCELLENT WATER SUPPLY OUTLOOK CURRENTLY IS ANTICIPATED. RESERVOIR STORAGE IS 237% OF NORMAL. LAST YEAR WAS 189% OF NORMAL. "' The Conservation of Water begins icith lite Snow Survey" LOW Woo PORTUMM On Iftl