Drought Information Statement
Issued by NWS Denver/Boulder, CO

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AXUS75 KBOU 122256 CCA
DGTBOU
COC001-005-013-014-019-031-035-039-047-049-057-
059-069-073-075-087-093-095-115-117-121-123-270000-

DROUGHT INFORMATION STATEMENT
NATIONAL WEATHER SERVICE DENVER CO
452 PM MDT THU APR 12 2018

...Severe drought expands northward into the majority of Elbert and
Lincoln Counties on the central Colorado Plains...

SYNOPSIS...

Warmer and drier conditions the first several weeks of March gave
way to a wetter weather pattern in late March and early April across
northern Colorado. The mountain snowpack has improved. However, it
is a different story on the central Colorado plains where
precipitation has remained much below normal.

LOCAL AREAS AFFECTED...

On April 10th, severe Drought /D2/ was extended northward across
most of Lincoln and southeast Elbert Counties on the U.S. Drought
Monitor. At the same time Moderate Drought /D1/ was removed from
northern Park County. Abnormally Dry conditions /D0/ were removed
from Summit County, Jackson County, and sections of Grand County in
the north central mountains.

Moderate Drought /D1/ continues in Douglas County, western and
northern Elbert County, extreme northern Lincoln County, and Adams
and Arapahoe Counties east of Denver County. Elsewhere in north
central and northeast Colorado, either Abnormally Dry
/D0/ conditions or no drought prevailed.

AGRICULTURAL IMPACTS...

Six month Standard Precipitation Indices are in the -1 to -2.5
range. Reports confirm that recent dry and windy conditions in
Elbert County are yielding impacts of Severe Drought /D2/. Reports
recently include little to no moisture in the soil when digging down
2 to 3 feet making it difficult or impossible to put in fence posts.

The Standard Precipitation Index /SPI/ is a probability index that
only considers precipitation. The SPI was developed to monitor
potential short term agricultural and long term hydrologic drought
conditions. The more negative the SPI value is...the farther below
normal precipitation is.

SNOWPACK AND WATER SUPPLY...

The high country snowpack held fairly steady in March, but has been
increasing in early April. The northern mountains of Colorado
continue to hold substantially more snow than the southern half of
the state. The mountain snowpack was 84 percent of normal in the
upper Colorado River basin, 92 percent of normal in the South Platte
basin, and 102 percent of normal in the North Platte basin on April
12th.

Reservoir storage remained above average. Combined storage was 118
percent of average in the upper Colorado River basin, and 108
percent of average in the South Platte basin on April 1st. Over 70
percent of the U.S. Geological Survey stream gages had normal to
above normal flows on April 12th.

PRECIPITATION AND WEATHER OUTLOOKS...

Preliminary 30 day NWS Cooperative Observer precipitation totals
from March 13th through April 11th are listed below:

Location            Elev     2018   Normal  Departure  % Normal
--------            ----     ----   ------  ---------  --------
Above 8000 feet
 Dillon 1E          9065     2.66     1.08      1.58      246
 Georgetown         8520     2.00     1.75      0.25      114
 Georgetown 4SW    10020     1.74     2.22     -0.48       78
 Grant              8675     1.06     1.31     -0.25       81
 Walden             8056     0.77     0.91     -0.14       85
 Winter Park        9108     5.36     2.74      2.62      196

6000 to 8000 feet
 Cheesman Reservoir 6880     0.94     1.53     -0.59       61
 Conifer 6NE        7180     2.43     2.72     -0.29       89
 Evergreen          6985     1.40     2.26     -0.86       62
 Glendevey 11NNW    7760     1.13     1.51     -0.38       75
 Virginia Dale 7ENE 7015     2.29     1.50      0.79      153
 Williams Fork Rsvr 7618     2.17     1.04      1.13      209

Front Range Urban Corridor
 Boulder            6484     2.69     2.46      0.23      109
 Denver area        5284     1.21     1.11      0.10      109
 Fort Collins       5004     0.91     1.66     -0.75       55
 Loveland 2N        5080     1.16     1.76     -0.60       66
 Northglenn         5407     1.67     1.37      0.30      122
 Wheat Ridge        5398     1.71     2.01     -0.30       85

Northeast/East Central Colorado Plains
 Akron 4E           4540     0.68     0.99     -0.31       69
 Holyoke            3780     0.38     1.18     -0.80       32
 Karval             5075     0.45     0.97     -0.52       46
 New Raymer 21N     5180     1.21     1.14      0.07      106
 Sedgwick 5S        3990     0.60     1.27     -0.67       47
 Woodrow 6NNE       4374     0.59     0.94     -0.35       63

The lingering effects of a moderate La Nina may continue to
influence weather patterns across the western U.S. for the next
several weeks. The NWS 6 to 10 day and 8 to 14 day outlooks have a
tilt toward below normal temperatures and above normal precipitation
across north central and northeast Colorado.

&&

RELATED WEB SITES...

Additional information on current drought conditions may be found at
the following addresses:

Local weather...climate and water information: www.weather.gov/bou

U.S. Drought Monitor:
droughtmonitor.unl.edu

Colorado Climate Center NIDIS Weekly Summary:
climate.colostate.edu/~drought/

NWS Climate Prediction Center Outlooks:
www.cpc.ncep.noaa.gov

CWCB Water Availability Task Force Presentations:
cwcb.state.co.us/public-information/flood-water-availability-task-
forces/

ACKNOWLEDGMENTS...

The U.S. Drought Moniotr is a multi-agency effort involving NOAA`s
National Weather Service, State and Regional Climate Centers,
Department of Agriculture (USDA) and the National Drought Mitigation
center. Information for this statement has been gathered from NWS
and FAA observation sites, Cooperative Network station, the Natural
Resources Conservation Service SNOTEL Network, U.S. Geological
Survey, U.S. Bureau of Reclamation and U.S. Army Corp of Engineers
stream and reservoir gages.

$$
tlh


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