NOUS46 KSEW 060309 PNSSEW Washington Precipitation Summary

9/12/21, 5:08 AM NWS Product View

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NOUS46 KSEW 082345 PNSSEW

Washington Precipitation Summary National Weather Service Seattle WA 545 PM PDT Wed Sep 8 2021

August brought below normal precipitation for nearly all of the Western Washington regions except for the western slopes of the Cascades. However, most of Eastern Washington received near to above normal precipitation except for the Central Basin, and the Palouse and Blue Mountains. As we head into the last month of the current Water Year, the majority of Western Washington is still near normal with only the Olympics, Southwest Interior and Northwest Interior areas below normal. For Eastern Washington, nearly all regions were still below normal except for the eastern slopes of the Cascades which are still near normal.

For Western Washington, the monthly percentage of normal for precipitation ranged from 19 percent in the Southwest Interior to 96 percent in the western slopes of the Cascades. The greatest amount of precipitation at the climate stations for the mountains, coast and interior lowlands was 2.65 inches at Diablo Dam in the western slopes of the Cascades, 0.80 at Quillayute, and 0.85 inches at Bellingham in the Northwest Interior.

For Eastern Washington, the percentage of normal for precipitation ranged from 56 percent in the Palouse and Blue Mountains to 152 percent in the Northeast Region. The greatest amount of precipitation at the climate stations for the mountains and lowlands was 1.02 inches at Winthrop on the eastern slopes of the Cascades, and 1.61 at Chewelah in the Northeast region.

The outlook for September and beyond for Washington state, for the next two weeks the outlook is for above normal precipitation. The monthly outlook for September calls for below normal precipitation for the state. The three month outlook for September through November shows equal chances for above, below and near normal precipitation for Eastern Washington, with above normal precipitation expected for western half of the state.

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.

https://www.wrh.noaa.gov/total_forecast/getprod.php?wfo=sew&version=0&print=yes&afos=XXXPNSSEW 1/3 9/12/21, 5:08 AM NWS Product View August Water year Past 3 Past 12 2021 to date months months Western Washington Coast 34 96 65 98 Olympics 31 84 47 86 Northwest Interior 54 89 37 90 Puget Sound Lowlands 23 94 71 98 Southwest Interior 19 85 67 88 West Foothills Casca 71 93 57 96 Cascades West 96 97 71 99

Eastern Washington East Slopes Cascades 104 96 64 98 Okanogan 143 70 46 71 Central Basin 68 56 33 56 Northeast 152 75 52 75 Palouse and Blue Mtn 56 77 52 74

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 0.80 30 86.55 90 91.68 92 Hoquiam 0.56 41 64.91 99 68.69 101 Bellingham 0.85 77 32.28 97 34.68 98 Seattle 0.11 11 35.02 94 37.50 97 Olympia 0.01 1 49.54 103 52.87 106 Longview 0.16 16 42.32 93 46.10 97

Concrete 1.16 76 65.23 97 70.08 99 Snoqualmie Fall 1.63 134 53.19 88 55.73 88 Randle* 0.86 71 51.54 95 55.64 97 Diablo Dam 2.65 175 70.28 95 75.68 98 Stampede Pass 1.34 86 93.13 117 98.36 118 Paradise* 1.57 96 106.64 96 112.48 97

Winthrop 1.02 227 13.88 96 14.31 96 Stehekin 0.61 124 40.77 115 43.44 120 Leavenworth 0.09 24 26.57 106 28.05 109 Mount Adams 0.03 5 40.00 89 41.09 90 Wenatchee 0.18 78 5.99 73 6.30 74 Yakima 0.03 14 4.77 60 4.83 58

Coulee Dam 0.50 152 7.83 74 8.43 76 Lind 0.35 146 5.18 54 5.35 53 Republic 0.40 63 14.69 87 15.26 86 Spokane 0.15 32 10.71 67 11.04 67 Pullman 0.36 73 14.99 86 15.16 79 https://www.wrh.noaa.gov/total_forecast/getprod.php?wfo=sew&version=0&print=yes&afos=XXXPNSSEW 2/3 9/12/21, 5:08 AM NWS Product View Dayton 0.24 53 12.27 67 12.64 67

* = Estimated

$$ Grub

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