594  
NOUS46 KSEW 062100  
PNSSEW  
 
WASHINGTON PRECIPITATION SUMMARY  
NATIONAL WEATHER SERVICE SEATTLE WA  
200 PM PDT TUE APR 6 2021  
 
MARCH BROUGHT BELOW NORMAL PRECIPITATION FOR MUCH OF THE STATE,  
EXCEPT FOR THE OLYMPIC MOUNTAINS, WHICH RECEIVED NEAR NORMAL  
PRECIPITATION. FOR THE WATER YEAR, ALL OF WESTERN WASHINGTON AND  
MOST OF EASTERN WASHINGTON ARE NEAR TO ABOVE NORMAL. ONLY THE  
OKANOGAN REGION AND CENTRAL BASIN IN EASTERN WASHINGTON ARE BELOW  
NORMAL.  
 
FOR WESTERN WASHINGTON, THE MONTHLY PERCENTAGE OF NORMAL FOR  
PRECIPITATION RANGED FROM 55 PERCENT IN THE SOUTHWEST INTERIOR TO 94  
PERCENT IN THE OLYMPIC MOUNTAINS. THE GREATEST AMOUNT OF  
PRECIPITATION AT THE CLIMATE STATIONS FOR THE MOUNTAINS, COAST AND  
INTERIOR LOWLANDS WAS 12.79 INCHES AT FORKS IN THE OLYMPIC  
MOUNTAINS, 9.36 AT QUILLAYUTE, AND 5.14 INCHES AT ELMA IN THE  
SOUTHWEST INTERIOR.  
 
FOR EASTERN WASHINGTON, THE PERCENTAGE OF NORMAL FOR PRECIPITATION  
RANGED FROM 8 PERCENT IN THE OKANOGAN REGION TO 41 PERCENT IN THE  
PALOUSE AND BLUE MOUNTAINS. THE GREATEST AMOUNT OF PRECIPITATION AT  
THE CLIMATE STATIONS FOR THE MOUNTAINS AND LOWLANDS WAS 1.07 INCHES  
AT CLE ELUM ON THE EASTERN SLOPES OF THE CASCADES, AND 0.57 AT  
NORTHPORT IN THE NORTHEAST REGION.  
 
THE OUTLOOK FOR APRIL AND BEYOND FOR WASHINGTON STATE, FOR THE NEXT  
TWO WEEKS THE OUTLOOK IS FOR BELOW NORMAL PRECIPITATION. THE  
MONTHLY OUTLOOK FOR APRIL CALLS FOR EQUAL CHANCES OF ABOVE, BELOW  
AND NEAR NORMAL PRECIPITATION FOR THE STATE. THE THREE MONTH  
OUTLOOK FOR APRIL THROUGH JUNE CALLS FOR EQUAL CHANCES OF ABOVE,  
BELOW AND NEAR NORMAL PRECIPITATION FOR MUCH OF THE STATE, EXCEPT  
FOR BELOW NORMAL PRECIPITATION IN THE EXTREME SOUTHEAST CORNER.  
 
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.  
 
MARCH WATER YEAR PAST 3 PAST 12  
2021 TO DATE MONTHS MONTHS  
WESTERN WASHINGTON  
COAST 85 109 114 104  
OLYMPICS 94 98 105 98  
NORTHWEST INTERIOR 58 115 108 109  
PUGET SOUND LOWLANDS 70 108 121 110  
SOUTHWEST INTERIOR 55 95 102 96  
WEST FOOTHILLS CASCA 63 107 110 104  
CASCADES WEST 60 108 111 105  
 
EASTERN WASHINGTON  
EAST SLOPES CASCADES 30 110 116 102  
OKANOGAN 8 87 77 86  
CENTRAL BASIN 12 73 70 74  
NORTHEAST 23 102 99 102  
PALOUSE AND BLUE MTN 41 95 83 96  
 
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.  
 
MARCH WATER YEAR PAST 12 MONTHS  
INCHES PCT INCHES PCT INCHES PCT  
 
QUILLAYUTE 9.36 86 78.20 105 100.19 101  
HOQUIAM 5.75 82 58.62 112 72.23 107  
BELLINGHAM 1.75 56 28.18 117 40.06 114  
SEATTLE 2.61 70 30.85 109 40.91 109  
OLYMPIA 3.01 57 43.50 111 53.89 108  
LONGVIEW 3.00 64 36.39 105 49.40 103  
 
CONCRETE 3.12 46 58.21 111 76.97 109  
SNOQUALMIE FALL 3.80 61 43.98 98 60.92 98  
RANDLE* 3.33 63 44.93 108 60.00 105  
DIABLO DAM 3.81 54 60.80 101 75.94 98  
STAMPEDE PASS 5.68 75 81.59 134 101.10 124  
PARADISE 7.88 63 98.49 108 122.19 103  
 
WINTHROP 0.04 4 11.97 120 14.33 97  
STEHEKIN 0.65 23 37.56 124 43.30 120  
LEAVENWORTH* 0.63 30 25.23 124 29.05 116  
MOUNT ADAMS* 1.65 30 38.10 99 41.64 91  
WENATCHEE 0.10 16 5.62 88 6.97 77  
YAKIMA 0.08 13 4.47 79 5.72 69  
 
COULEE DAM 0.12 13 6.32 99 10.40 96  
LIND 0.07 7 4.70 73 9.16 94  
REPUBLIC 0.33 26 10.93 124 20.49 121  
SPOKANE 0.26 16 9.60 91 14.41 87  
PULLMAN 0.84 53 12.93 96 19.45 96  
DAYTON 0.70 32 10.75 86 16.26 85  
 
* = ESTIMATED  
 

 
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