Public Information Statement
Issued by NWS Seattle/Tacoma, WA

Home | Current Version | Previous Version | Text Only | Print | Product List | Glossary On
Versions: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22
000
NOUS46 KSEW 072009
PNSSEW

Washington Precipitation Summary
National Weather Service Seattle WA
1209 PM PST Sun Jan 7 2018

For the final month of 2017, December brought below normal
precipitation to most of Washington State.  However, all of
Washington ended up with near to above normal precipitation for 2017
and for a few sites, 2017 was in their top ten wettest years on
record.  As for the water year, nearly all of Washington is near to
above normal, except for the Okanogan region which is below normal.

In western Washington, the monthly percentage of normal for
precipitation ranged from 57 percent in the Olympics to 134 percent
in the Northwest Interior.  The greatest amount of precipitation at
the climate stations for the mountains, coast and interior lowlands
was 18.20 inches at Cougar in the western slopes of the Cascades,
11.03 at Quillayute, and 9.84 inches at Elma in the Southwest
Interior.

For eastern Washington, the percentage of normal for precipitation
ranged from 57 percent for both the Okanogan region and Central
Basin, to 160 percent in the Palouse and Blue Mountains.  The
greatest amount of precipitation at climate stations for the
mountains and lowlands was 6.19 inches at Stehekin in the eastern
slopes of the Cascades, and 2.88 at Spokane in the Northeast region.

The outlook for January and beyond for Washington state, for the
next two weeks the outlook is for above normal precipitation.  The
monthly outlook for January calls for equal chances of above, below
and near normal precipitation for most of the state, except for
below normal precipitation for the extreme south central part. The
three month outlook for January through March is calling for above
normal precipitation for the state.

The table below gives precipitation figures as a percent of normal
for regions of Washington.  The current water year began 1 October
2017 and ends 30 September 2018.

                      December    Water year      Past 3       Past 12
                         2017       to date       months        months
Western Washington
  Coast                    81          108          108           112
  Olympics                 57          111          111           107
  Northwest Interior      134          127          127           110
  Puget Sound Lowlands     81          115          115           121
  Southwest Interior       83          111          111           114
  West Foothills Casca     95          117          117           111
  Cascades West           109          120          120           113

Eastern Washington
  East Slopes Cascades     63          105          105           111
  Okanogan                 57           87           87           109
  Central Basin            57          103          103           124
  Northeast                87          108          108           112
  Palouse and Blue Mtn    160          145          145           130



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.

                   December           Water year       Past 12 months
                Inches    Pct       Inches    Pct       Inches    Pct

Quillayute       11.03     85        38.20     98       109.59    123
Hoquiam           7.82     79        31.59    114        77.09    129
Bellingham        5.09    124        17.47    129        40.45    127
Seattle           5.43    101        18.86    122        47.87    138
Olympia           6.90     92        25.76    125        61.43    136
Longview          6.08     89        20.71    112        53.41    125

Concrete          9.10     92        33.43    116        76.96    121
Snoqualmie Fall   7.13     84        26.09    108        66.43    116
Randle*           6.21     95        26.27    118        63.64    122
Diablo Dam       10.16     92        35.73    105        76.63    112
Stampede Pass    13.19    117        42.34    125        91.31    142
Paradise         15.89     93        55.56    116       128.22    124

Winthrop          1.61     64         6.02    106        16.24    121
Stehekin          6.19     91        21.71    127        44.55    142
Leavenworth       2.02     45         8.23     74        24.29    109
Mount Adams       4.35     50        22.38    110        60.76    146
Wenatchee         0.87     57         3.08     90        10.16    116
Yakima            0.36     24         2.40     77        10.35    136

Coulee Dam        0.72     50         2.95     86        12.51    123
Lind              1.39    110         4.68    136        13.51    146
Republic          1.00     47         3.96     80        18.05    112
Spokane           2.88    125         7.16    124        22.34    144
Pullman           3.36    131         8.86    137        24.47    128
Dayton            3.79    173         8.34    130        23.44    134

* = Estimated

$$
Grub


USA.gov is the U.S. government's official web portal to all federal, state and local government web resources and services.