West Slopes Northern Cascades and Passes Severe Watches & Warnings NOAA Weather Radio

Areal Flood Warning
Statement as of 12:45 PM PDT on April 17, 2014

The National Weather Service in Seattle has extended the

* Flood Warning for the North Fork stillaguamish river east of the State Route 530 slide in north central Snohomish County...

* until 445 PM PDT April 24.

* Flooding continues on the North Fork of the stillaguamish river upstream of the sr 530 slide due to debris from the State Route 530 slide partially blocking the river and the resulting pooling of water behind the debris dam. We will be updating the Flood Warning on a day to day basis.

* The Oso area has received 1.84 inches of rain in the last 24 hours. The rainfall forecast is for another 1.0 inches of rain in the Oso area and up to 1.5 inches in the mountains through Friday morning. The river will continue rising today...cresting tonight before midnight with the largest flows since the slide occurred. The peak flow forecast for the North Fork river near Arlington gage is near 9.3 ft. Or 13000 cfs and near 7900 cfs for the North Fork stillaguamish river at Oso.

* At 1200 PM PDT...the pool elevation was 285.8 ft.

* The pool elevation is forecast to rise to 287.7 ft. By Thursday night before midnight. The pool elevation will start dropping significantly Friday. There is a great amount of uncertainty in the forecast pool elevation crest due in part to limited knowledge of how much water the new stream channel through the slide debris will be able to convey.

Precautionary/preparedness actions...

A Flood Warning means flooding is occurring or imminent. Most flood related deaths occur in automobiles. Do not attempt to cross water covered bridges...dips...or low water crossings. Never try to cross a flowing stream...even a small one...on foot. To escape rising water move up to higher ground.

Lat...Lon 4825 12181 4829 12185 4829 12177 4829 12166 4824 12165 4826 12174

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Public Information Statement
Statement as of 12:09 PM PDT on April 17, 2014

It was a very wet March for much of Washington state...and for some...this was the wettest March on record. Nearly everyone exceeded the normal rainfall for the month...and some received more than double. The March rainfall also helped improve the water year values for the state with some areas now near normal...although most still remain below normal.

In western Washington...the monthly percentage of normal for precipitation ranged from 159 percent in the Olympics to 216 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 23.24 inches at Paradise Ranger station on the west slopes of the Cascades...18.97 inches at Clearwater...and 19.10 inches at Grays River in the southwest interior.

For eastern Washington...the percentage of normal for precipitation ranged from 111 percent in the Okanogan region to 183 percent in the east slopes of the Cascades. The greatest amount of precipitation at climate stations for the mountains and lowlands was 11.07 inches at Mount Adams Ranger station on the east slopes of the Cascades...and 5.20 inches at Newport in the northeast region.

The outlook for April and beyond...for the next two weeks the outlook is for below normal precipitation for all of Washington. The monthly outlook for April is calling for equal chances of normal...above...or below normal precipitation for the state. The three month outlook from April to June calls for below normal precipitation for the western half of the state...with equal chances of normal...above...or below normal precipitation for the eastern half.

The Table below gives precipitation figures as a percent of normal for regions of Washington. The current water year began 1 October 2013 and ends 30 September 2014.

March water year past 3 past 12 2014 to date months months western Washington coast 167 76 109 91 Olympics 159 70 111 86 northwest interior 194 97 128 109 Puget Sound lowlands 210 83 133 101 southwest interior 162 78 113 96 west foothills casca 216 98 139 111 Cascades west 199 94 132 107

Eastern Washington east slopes Cascades 183 91 145 111 Okanogan 111 77 124 98 Central Basin 125 66 104 95 northeast 166 72 104 87 Palouse and blue mtn 166 80 112 97

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 15.81 146 55.61 74 88.92 105 Hoquiam 14.07 201 40.70 78 63.65 103 Bellingham 5.48 176 20.65 85 36.57 111 Seattle 9.44 254 26.24 93 43.33 123 Olympia 9.17 173 31.05 79 51.84 111 Longview 7.53 161 29.17 84 50.51 112

Concrete 14.08 206 51.64 99 76.98 120 Snoqualmie fall 13.02 208 43.62 97 68.39 120 randle* 11.51 216 40.92 98 63.72 121 Diablo dam 18.74 265 57.02 94 82.87 119 Stampede Pass 14.10 187 65.50 107 95.50 128 Paradise 23.24 185 89.50 98 130.70 120

Winthrop 1.33 129 7.25 73 13.86 99 Stehekin 7.04 246 29.22 96 41.76 122 Leavenworth 3.21 154 15.54 77 25.53 110 Mount Adams 11.07 201 36.49 95 52.20 120 Wenatchee 0.69 113 2.45 38 7.99 97 Yakima 0.60 97 3.16 56 6.92 93

Coulee Dam 1.41 155 3.61 57 9.15 92 Lind 1.23 119 3.97 61 8.13 87 Republic 2.06 163 6.26 71 16.39 102 Spokane 2.88 179 8.03 76 13.87 89 Pullman 2.82 178 10.60 79 18.83 97 Dayton 2.34 107 8.12 65 15.33 88

* = estimated