426  
NOUS46 KSEW 210206 AAA  
PNSSEW  
 
WASHINGTON PRECIPITATION SUMMARY...AMENDED  
NATIONAL WEATHER SERVICE SEATTLE WA  
705 PM PDT WED JUN 20 2018  
 
FROM ONE EXTREME TO ANOTHER. AFTER A VERY WET APRIL, MAY SAW MUCH  
BELOW NORMAL PRECIPITATION FOR MOST OF WASHINGTON STATE, EXCEPT FOR  
A FEW REGIONS IN EASTERN WASHINGTON THAT HAD NEAR NORMAL  
PRECIPITATION. FOR MANY SITES IN WESTERN WASHINGTON AND A FEW IN  
EASTERN WASHINGTON, THIS WAS THEIR DRIEST OR IN THEIR TOP TEN DRIEST  
MAY ON RECORD. HOWEVER, FOR PULLMAN IN EASTERN WASHINGTON, THIS WAS  
THEIR 5TH WETTEST MAY ON RECORD. FOR THE WATER YEAR THOUGH, ALL OF  
WASHINGTON STATE CONTINUES TO BE NEAR TO ABOVE NORMAL.  
 
IN WESTERN WASHINGTON, THE MONTHLY PERCENTAGE OF NORMAL FOR  
PRECIPITATION RANGED FROM 7 PERCENT IN THE SOUTHWEST INTERIOR TO 33  
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 3.54 INCHES AT MUD MOUNTAIN DAM IN  
THE WESTERN FOOTHILLS OF THE CASCADES, 0.80 AT QUILLAYUTE, AND 0.89  
INCHES AT MONROE IN THE PUGET SOUND LOWLANDS.  
 
FOR EASTERN WASHINGTON, THE PERCENTAGE OF NORMAL FOR PRECIPITATION  
RANGED FROM 55 PERCENT IN THE OKANOGAN REGION TO 106 PERCENT IN THE  
PALOUSE AND BLUE MOUNTAINS. THE GREATEST AMOUNT OF PRECIPITATION AT  
CLIMATE STATIONS FOR THE MOUNTAINS AND LOWLANDS WAS 1.93 INCHES AT  
PULLMAN IN THE PALOUSE AND BLUE MOUNTAINS, AND 2.71 AT NORTHPORT IN  
THE NORTHEAST REGION.  
 
THE OUTLOOK FOR JUNE AND BEYOND FOR WASHINGTON STATE, FOR THE NEXT  
TWO WEEKS THE OUTLOOK IS FOR BELOW NORMAL PRECIPITATION. THE  
MONTHLY OUTLOOK FOR JUNE ALSO CALLS FOR BELOW NORMAL PRECIPITATION.  
THE THREE MONTH OUTLOOK FOR JUNE THROUGH AUGUST IS ALSO CALLING FOR  
BELOW NORMAL PRECIPITATION FOR THE STATE AS WELL.  
 
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.  
 
MAY WATER YEAR PAST 3 PAST 12  
2018 TO DATE MONTHS MONTHS  
WESTERN WASHINGTON  
COAST 14 104 87 101  
OLYMPICS 19 103 81 98  
NORTHWEST INTERIOR 16 129 94 115  
PUGET SOUND LOWLANDS 14 112 98 105  
SOUTHWEST INTERIOR 7 98 84 95  
WEST FOOTHILLS CASCA 33 112 90 104  
CASCADES WEST 30 116 96 109  
 
EASTERN WASHINGTON  
EAST SLOPES CASCADES 57 110 122 102  
OKANOGAN 55 112 133 94  
CENTRAL BASIN 86 107 116 96  
NORTHEAST 81 116 113 98  
PALOUSE AND BLUE MTN 106 124 121 110  
 
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 0.80 16 87.48 100 96.27 102  
HOQUIAM 0.35 11 64.74 107 69.72 109  
BELLINGHAM 0.72 29 36.21 124 39.62 119  
SEATTLE 0.12 6 37.39 114 39.52 111  
OLYMPIA 0.24 10 49.33 110 52.06 110  
LONGVIEW 0.10 3 40.78 98 44.97 99  
 
CONCRETE 0.73 19 70.29 115 73.37 109  
SNOQUALMIE FALL 1.57 39 59.57 111 64.44 111  
RANDLE* 1.08 33 58.34 119 62.58 115  
DIABLO DAM 0.62 19 74.82 109 77.16 103  
STAMPEDE PASS 2.15 50 89.51 127 96.25 122  
PARADISE 1.02 17 117.95 112 128.06 115  
 
WINTHROP 0.70 63 15.86 134 16.29 119  
STEHEKIN 0.30 27 42.70 129 43.32 124  
LEAVENWORTH 1.00 93 21.74 97 22.35 94  
MOUNT ADAMS 0.30 18 43.49 103 47.35 106  
WENATCHEE 0.66 96 7.36 97 7.64 91  
YAKIMA 0.13 22 6.02 89 6.59 86  
 
COULEE DAM 0.55 48 9.08 108 9.94 104  
LIND 1.35 165 11.62 143 12.67 135  
REPUBLIC 1.04 53 14.23 118 15.18 106  
SPOKANE 1.45 90 16.09 120 18.01 117  
PULLMAN 1.93 292 19.02 128 20.79 112  
DAYTON 1.07 61 17.68 110 19.87 109  
 
* = ESTIMATED  
 

 
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