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:
July Precipitation :
Water Year Precipitation (Oct-June):
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.
|The above images are of reference evapotranspiration (ET) from CoAgMet sites across Colorado. Reference ET assumes the amount of water that will evaporate from a well-irrigated crop. Higher ET rates occur during hot, dry, and windy conditions. Lower ET rates are more desirable for crops. See a map of locations for the above ET sites.|
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 for August 26, 2014:
The North American Monsoon continues to perform above average for the drought monitor region this year and seems to be bringing some much-needed relief to one area or another every week. This week the main beneficiary has been the north fork of the UCRB. Duchense and Uintah Counties experienced a substantial drought-lessening week with precipitation totals over 3" and temperatures 2-6 degrees F below normal. Even with the moisture in the Four Corners area, precipitation totals are still below normal.
Parts of the San Juan headwaters received above average moisture over the past week as well. The Four Corners and the San Luis Valley still had a fairly dry week.
East of the divide conditions were mostly dry with near normal temperatures for the Front Range and most of Southeast Colorado. Parts of Baca County and much of the Eastern Plains experienced over an inch of moisture over the past week. Some of the heaviest hit areas include Kit Carson County, Morgan County, Eastern Arapahoe County, and Western Washington County.
Based on improving streamflow and surface water conditions in tandem with very wet short-term SPIs and average longer-term SPIs a one-category improvement appears to be merited for the D2 and D3 areas of Duchesne and Uintah Counties in Northeast Utah. The removal of D0 or D1 appears premature based on surface responses to the recent heavy rainfall. Good moisture over the last week on both sides of the Uintah mountains seems to justify trimming the D1 area in Dagget County extending into Moffat County as well.
Indicators of 6 months or fewer are continuing to fall further out of line with D3 and D2 classifications in Southeast Colorado, but for now status quo is recommended based primarily on Agricultural ground reports and indices going back over 9 months. This situation will be closely-monitored, but status quo is recommended for now.
Southeast Lincoln County experienced over 2" of precipitation over the past week. This appears to be enough justification to trim back the D1 in the area to D0.
Based on recent storms the gradient could be tightened between D1 and D Nada from Northern Cheyenne County up into Kit Carson County, but conditions from last week do not justify trimming the border of D1 in Cheyenne County.