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Washington Precipitation Summary
National Weather Service Seattle WA
755 PM PDT Wed Sep 2 2020

Most of Washington state saw below normal precipitation for the month
of August, except for parts of the Coast and Olympics which received
above normal precipitation.  For the Water Year, most of Western
Washington is near normal except for the Olympic and Southwest
Interior regions which are below normal.  For Eastern Washington,
most regions are below normal except for the Northeast and Palouse
and Blue Mountains regions which are near normal.

For Western Washington, the monthly percentage of normal for
precipitation ranged from 39 percent on the western slopes of the
Cascades to 157 percent in the Olympics.  The greatest amount of
precipitation at the climate stations for the mountains, coast and
interior lowlands was 4.06 inches at Forks in the Olympics, 4.20 at
Quillayute, and 1.09 inches at Everett in the Puget Sound Lowlands.

For Eastern Washington, the percentage of normal for precipitation
ranged from 3 percent for both the eastern slopes of the Cascades
and Central Basin, to 33 percent in the Okanogan region.  The
greatest amount of precipitation at the climate stations for the
mountains and lowlands was 0.46 inches at both Rosalia and Pullman
in the Palouse and Blue Mountains, and 0.30 at Grand Coulee Dam in
the Okanogan region.

The outlook for September and beyond for Washington state, for the
next two weeks the outlook is for below normal precipitation.  The
monthly outlook for September also calls for below normal
precipitation.  The three month outlook for September through
November calls for above normal precipitation.

The table below gives precipitation figures as a percent of normal
for regions of Washington.  The current water year began 1 October
2019 and ends 30 September 2020.

                         August    Water year      Past 3       Past 12
                          2020       to date       months        months
Western Washington
  Coast                   137           96          109           100
  Olympics                157           88          124            92
  Northwest Interior       47          109           93           117
  Puget Sound Lowlands     57          101          106           106
  Southwest Interior       47           87          103            93
  West Foothills Casca     43          101           80           105
  Cascades West            39          105           79           108

Eastern Washington
  East Slopes Cascades      3           76           33            82
  Okanogan                 33           70           67            84
  Central Basin             3           68           51            73
  Northeast                21           94           96           101
  Palouse and Blue Mtn      4           92           55            93

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.

                    August            Water year       Past 12 months
                Inches    Pct       Inches    Pct       Inches    Pct

Quillayute        4.20    169        99.16    104       108.60    109
Hoquiam           1.01     77        60.03     92        64.49     95
Bellingham*       0.59     47        36.08    108        40.69    115
Seattle           0.31     35        37.37    104        40.69    109
Olympia           0.37     39        45.79     95        49.22     98
Longview          0.36     31        42.62     93        46.26     96

Concrete          0.73     43        70.44    105        75.85    108
Snoqualmie Fall   0.81     63        60.45    102        65.85    106
Randle*           0.52     43        55.32    101        60.25    106
Diablo Dam        0.42     25        73.77    100        78.90    102
Stampede Pass     0.69     45        84.89    110        88.89    109
Paradise          1.13     57       121.14    107       129.03    109

Winthrop          0.01      2         8.68     61        10.92     74
Stehekin          0.02      3        30.62     87        33.06     92
Leavenworth*      0.01      3        19.93     82        20.92     84
Mount Adams       0.00      0        30.69     69        34.33     75
Wenatchee         0.00      0         3.99     45         5.13     56
Yakima            0.01      4         3.89     49         4.41     53

Coulee Dam        0.30    107         8.28     80         9.99     93
Lind              0.00      0         9.63    103        10.94    112
Republic          0.22     27        15.62     97        17.88    106
Spokane           0.02      3        13.70     86        15.68     95
Pullman           0.05      3        17.88     96        18.93     93
Dayton            0.02      4        14.84     81        15.89     83

* = Estimated

$$
Grub


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