Weather Alerts for Chelan & Douglas Counties

Issued by the National Weather Service

Hydrologic Outlook  HYDROLOGIC OUTLOOK   Hydrologic Outlook
CHELAN & DOUGLAS COUNTIES

Areas Affected:
East Slopes Northern Cascades - Lower Garfield and Asotin Counties - Northeast Blue Mountains - Northeast Mountains - Okanogan Highlands - Okanogan Valley - Spokane Area - Washington Palouse - Waterville Plateau - Wenatchee Area
Effective: Mon, 3/18 12:55pm Updated: Mon, 3/18 4:30pm Urgency: Future
Expires: Tue, 3/19 11:30am Severity: Unknown Certainty: Possible

 
Details:
...WARM TEMPERATURES WILL MELT LOW ELEVATION SNOW THIS WEEK...
Temperatures will continue to warm this week, climbing into the
mid 50s to lower 60s by Tuesday. These temperatures are 5 to 10
degrees above normal. The warm up will accelerate snow melt across
the Inland Northwest.
Here are some impacts that may accompany the loss of much of our
lowland snow.
*A Good Chance of Field Flooding: If you live in an area that has
over a foot of snow on the ground and you typically experience
field flooding, there is a good chance that some field flooding
will occur. Fields that typically drain poorly will have the
greatest potential of experiencing standing water as the snow
melts.
*A Good Chance of Rises on Small Streams: Streams fed by low
elevation snow melt will experience rises this week. Some minor
flooding will be possible. Some roads that are frequently closed
due to field flooding may be impacted next week.
*A Low Chance of Ice Jam Flooding: Rivers that are ice covered
will likely experience break up as temperatures warm and runoff
brings rises to the rivers. Forecasting ice jams is difficult,
but at this time rapid river rises causing a sudden break up of
river ice is not anticipated.
*A Low Chance of Flooding on Rivers: Through the end of this week,
the threat of flooding on mainstem rivers will be low. Rivers
like the Coeur d`Alene, the Spokane, the Palouse, and the
Okanogan are not expected to approach flood stage through the end
of the week. Current base flows are quite low at this time.
Rises will occur, but river channels have room to accept runoff
from melting snow.
*Long Term River Outlook: Melting our low elevation snowpack is
necessary to mitigate significant flooding in the upcoming weeks.
If a good deal of our low elevation snow decreases gradually
during the next 1 to 2 weeks, the situation will improve as we
enter our typical higher mountain runoff season (mid April
through late May).