596
NOUS46 KSEW 270330 AAA
PNSSEW
WASHINGTON PRECIPITATION SUMMARY...AMENDED
NATIONAL WEATHER SERVICE SEATTLE WA
830 PM PDT TUE MAY 26 2020
THE BELOW NORMAL PRECIPITATION CONTINUED INTO APRIL FOR THE ENTIRE
STATE OF WASHINGTON. ALL OF EASTERN WASHINGTON AND A FEW REGIONS IN
WESTERN WASHINGTON DID NOT GET ABOVE 50 PERCENT OF NORMAL FOR THE
MONTH. AS FOR THE WATER YEAR, MOST OF WESTERN WASHINGTON IS NEAR
NORMAL EXCEPT FOR THE OLYMPICS AND SOUTHWEST INTERIOR WHICH ARE
BELOW NORMAL. ALL OF EASTERN WASHINGTON IS BELOW NORMAL FOR THE
WATER YEAR.
FOR WESTERN WASHINGTON, THE MONTHLY PERCENTAGE OF NORMAL FOR
PRECIPITATION RANGED FROM 32 PERCENT IN THE OLYMPICS TO 60 PERCENT
IN THE NORTHWEST INTERIOR. THE GREATEST AMOUNT OF PRECIPITATION AT
THE CLIMATE STATIONS FOR THE MOUNTAINS, COAST AND INTERIOR LOWLANDS
WAS 5.19 INCHES AT CEDAR LAKE ON THE WESTERN SLOPES OF THE CASCADES,
3.56 AT QUILLAYUTE, AND 3.64 INCHES AT VANCOUVER IN THE SOUTHWEST
INTERIOR.
FOR EASTERN WASHINGTON, THE PERCENTAGE OF NORMAL FOR PRECIPITATION
RANGED FROM 15 PERCENT IN THE CENTRAL BASIN TO 42 PERCENT IN THE
PALOUSE AND BLUE MOUNTAINS. THE GREATEST AMOUNT OF PRECIPITATION AT
THE CLIMATE STATIONS FOR THE MOUNTAINS AND LOWLANDS WAS 0.79 INCHES
AT STEHEKIN ON THE EASTERN SLOPES OF THE CASCADES, AND 0.54 AT
NORTHPORT IN THE NORTHEAST REGION.
THE OUTLOOK FOR MAY AND BEYOND FOR WASHINGTON STATE, FOR THE NEXT
TWO WEEKS THE OUTLOOK IS FOR ABOVE NORMAL PRECIPITATION. THE
MONTHLY OUTLOOK FOR MAY CALLS FOR EQUAL CHANCES OF ABOVE, BELOW OR
NEAR NORMAL PRECIPITATION. THE THREE MONTH OUTLOOK FOR MAY THROUGH
JULY 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
2019 AND ENDS 30 SEPTEMBER 2020.
APRIL WATER YEAR PAST 3 PAST 12
2020 TO DATE MONTHS MONTHS
WESTERN WASHINGTON
COAST 43 95 73 94
OLYMPICS 32 84 70 86
NORTHWEST INTERIOR 60 112 107 109
PUGET SOUND LOWLANDS 52 97 85 97
SOUTHWEST INTERIOR 50 83 77 87
WEST FOOTHILLS CASCA 57 102 104 100
CASCADES WEST 53 106 105 104
EASTERN WASHINGTON
EAST SLOPES CASCADES 26 78 62 86
OKANOGAN 22 59 39 79
CENTRAL BASIN 15 57 44 69
NORTHEAST 24 80 40 81
PALOUSE AND BLUE MTN 42 79 77 81
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.
APRIL WATER YEAR PAST 12 MONTHS
INCHES PCT INCHES PCT INCHES PCT
QUILLAYUTE 3.56 45 85.86 104 101.74 102
HOQUIAM 2.12 42 53.32 91 60.30 89
BELLINGHAM 1.86 72 28.56 107 37.38 106
SEATTLE 1.70 63 31.49 102 38.68 103
OLYMPIA 1.40 40 40.13 94 46.66 93
LONGVIEW 1.62 43 35.01 91 43.11 90
CONCRETE 3.12 62 59.65 104 70.46 100
SNOQUALMIE FALL 2.53 53 48.58 98 62.30 100
RANDLE* 2.36 57 46.78 102 57.52 101
DIABLO DAM 2.09 43 66.12 101 77.04 100
STAMPEDE PASS 3.25 62 73.86 111 84.36 104
PARADISE* 4.32 52 107.60 108 126.82 107
WINTHROP 0.15 20 6.90 64 12.59 85
STEHEKIN 0.79 50 28.34 89 35.15 97
LEAVENWORTH 0.21 19 17.98 84 21.78 87
MOUNT ADAMS 0.29 12 28.53 70 34.79 76
WENATCHEE 0.08 15 3.03 44 5.80 64
YAKIMA 0.07 13 2.77 45 4.94 60
COULEE DAM 0.21 24 5.01 69 9.86 91
LIND 0.25 30 5.59 77 8.38 86
REPUBLIC 0.18 15 6.81 68 13.68 81
SPOKANE 0.29 23 9.51 81 14.28 86
PULLMAN 0.58 75 12.11 85 15.97 78
DAYTON 0.46 27 10.16 71 15.15 79
* = ESTIMATED
GRUB
VALUES IN TABLES CORRECTED DUE TO CALCULATION ERRORS
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