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Issued by NWS Seattle/Tacoma, WA

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NOUS46 KSEW 070225
PNSSEW

Washington Precipitation Summary
National Weather Service Seattle WA
725 PM PDT Sun Jun 6 2021

May brought Washington state its third month in a row of below
normal precipitation.  This trend is having an effect on the Water
Year numbers.  Most of Western Washington is near normal for the
Water Year while the Olympics and Southwest Interior dipped into the
below normal category.  Most of Eastern Washington remained in the
below normal category for the Water Year, with only the eastern
slopes of the Cascades in the near near normal category.

For Western Washington, the monthly percentage of normal for
precipitation ranged from 34 percent in the Northwest Interior to 89
percent in the western foothills of the Cascades.  The greatest
amount of precipitation at the climate stations for the mountains,
coast and interior lowlands was 6.24 inches at Cedar Lake on the
western slopes of the Cascades, 2.40 at Quillayute, and 3.11 inches
at Mayfield in the Southwest Interior.

For Eastern Washington, the percentage of normal for precipitation
ranged from 6 percent in the Okanogan region to 35 percent in the
Northeast region.  The greatest amount of precipitation at the
climate stations for the mountains and lowlands was 0.83 inches at
Stehekin on the eastern slopes of the Cascades, and 1.51 at Republic
in the Northeast region.

The outlook for June and beyond for Washington state, for the next
two weeks the outlook is for near normal precipitation.  The monthly
outlook for June calls for below normal precipitation for the state.
The three month outlook for June through August also calls for below
normal precipitation.

The table below gives precipitation figures as a percent of normal
for regions of Washington.  The current water year began 1 October
2020 and ends 30 September 2021.

                           May     Water year      Past 3      Past 12
                          2021       to date       months       months
Western Washington
  Coast                    49           98           55           100
  Olympics                 69           87           69            92
  Northwest Interior       34           97           39            97
  Puget Sound Lowlands     60           96           54           101
  Southwest Interior       72           87           48            91
  West Foothills Casca     89           96           56            97
  Cascades West            85           99           53            99

Eastern Washington
  East Slopes Cascades     25           98           23            96
  Okanogan                  6           74           17            74
  Central Basin            18           60           13            58
  Northeast                35           84           32            86
  Palouse and Blue Mtn     19           80           24            73

The table below expresses precipitation in inches and as a percent of
normal for a variety of locations around the state.  Occasionally
missing data at a site are estimated using observed data from
surrounding stations.

                      May             Water year       Past 12 months
                Inches    Pct       Inches    Pct       Inches    Pct

Quillayute        2.40     56        83.03     94        96.94     97
Hoquiam           1.12     37        61.31    100        69.90    102
Bellingham        0.97     42        30.33    102        37.16    104
Seattle           1.12     60        33.00     97        38.24     99
Olympia           1.81     80        46.23    102        52.35    104
Longview          1.67     54        39.49     94        47.71     99

Concrete          2.85     82        62.81    101        72.88    102
Snoqualmie Fall   3.22     80        49.11     90        57.25     91
Randle*           2.93     89        48.36     98        56.88    100
Diablo Dam        3.19    118        65.68     95        74.74     96
Stampede Pass     3.73     80        88.58    121        98.73    118
Paradise          5.03     99       100.86     96       113.21     96

Winthrop          0.10      9        12.38    101        13.17     87
Stehekin          0.83     78        38.68    115        42.17    115
Leavenworth       0.34     24        25.71    111        28.02    109
Mount Adams       0.52     32        38.82     92        41.22     90
Wenatchee         0.08     10         5.72     79         6.19     71
Yakima            0.05      7         4.56     65         4.87     57

Coulee Dam        0.06      5         6.78     79         9.48     86
Lind              0.00      0         4.73     57         6.41     64
Republic          1.51     73        12.97    101        18.80    106
Spokane           0.20     13        10.01     72        11.29     67
Pullman           0.35     25        13.68     89        15.71     75
Dayton            0.22     12        11.20     70        12.33     64

* = Estimated

$$
Grub


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