The images above use daily precipitation statistics from NWS COOP, CoCoRaHS, and CoAgMet stations. From
top to bottom, and left to right: most recent 7-days of accumulated precipitation in inches; current month-to-date
accumulated precipitation in inches; last month's precipitation as a percent of average;
water-year-to-date precipitation as a percent of average.
Last Week Precipitation:
Water Year Precipitation (Oct-Mar):
SNOTEL AND SNOWPACK
The top left image shows the Natural Resources Conservation Service's SNOTEL water-year-to-date
precipitation percentile rankings. The top right image shows sub-basin averaged snow water
equivalent accumulations as a percent of average. The images below show accumulated snow water
equivalent in inches (green) compared to average (blue) and last year (red) for several different sub-basins
across the UCRB (and were created by the Colorado Basin River Forecast Center).
SNOTEL Precipitation Percentiles:
Basin-wide Snow Water Equivalent (SWE) Percent of Normal:
SWE Timeseries Graphs:
STANDARDIZED PRECIPITATION INDEX
Standardized Precipitation Index standardizes precipitation accumulations for a specified time period
into percentile rankings. -1.0 to -1.5 is
equivalent to a D1 to D2. -1.5 to -2.0 is equivalent to a D2 to D3. -2.0 and worse is equivalent to a D3 to
D4. 30- and 60-day SPIs focus on short-term conditions while 6- and 9-month SPIs focus on long-term
conditions. SPI data provided by High Plains Regional Climate Center.
Short Term (30-day):
Long Term (6-month):
The top left image shows 7-day averaged streamflows as a percentile ranking across the UCRB. The top
right image shows 7-day averaged discharge over time at three key sites around the UCRB: The Colorado
River at the CO-UT state line; the Green River at Green River, UT; and the San Juan River near Bluff,
UT. All streamflow data provided by United States Geological Survey.
The top left image shows VIC modeled soil moisture as a percentile ranking. The top right image shows
satellite-derived vegetation from the VegDRI product (which updates on Mondays).
The above image shows last month's and this month's current volumes of the major reservoirs in
the UCRB, with percent of average and percent of capacity.
All images show temperature departures from average over different time periods (last 7 days on top
left; month-to-date on top right; last full month on bottom). Temperature departure
maps provided by HPRCC ACIS.
Last Week Temperatures:
Last Month Temperatures:
FORECAST AND OUTLOOK
The top two images show Climate Prediction Center's Precipitation outlooks for 8 - 14 days (top left)
and 3 months (top right). The bottom left image shows the Hydrologic Prediction Center's Quantitative
Precipitation Forecast accumulation for the five days between Tuesday 12Z and ending Sunday 12Z. The
bottom right image shows the Climate Prediction Center's most recent release of the U.S. Seasonal
Above is the most recent release of the U.S. Drought Monitor map for the UCRB region. Below shows
the proposed changes for this week, with supporting text.
Summary: April 22, 2014
A quiet week in the Upper Colorado River Basin with less than 0.25" of precipitation falling throughout much of the basin. Temperatures continue to warm up, melting the snowpack in the mountains, causing the streamflow to increase in most basins in the region. Flows in the Colorado River and Green River have seen a nice increase, however with the low snowpack in the San Juan mountains, the San Juan River has not seen that increase.
East of the Basin saw beneficial precipitation fall through the Upper Arkansas Basin, however didn't make it to the drought stricken area of southeastern CO. The rest of Colorado remained dry, except for some rain storms that fell along the Foothills.
UCRB: With changes last week in the basin, status quo is recommended.
Eastern Colorado: After a week of beneficial precipitation and a good month to date, improvements in Pueblo and Huerfano are being recommended. It is recommended the D0 in these counties be improved to D nothing and the D1 line be pushed east to improve the D1 in western Pueblo County to D0.
With continuing dry and windy weather in Kiowa County, range conditions continue to get worse in this area. The small precipitation that has fallen recently had little to no impact on green up and wheat in the area. It is recommended the D2 in Kiowa County be degraded to D3. Also, it is recommended the D4 be pulled further east in Kiowa County.