Hydrologic Outlook
Issued by NWS Portland, OR
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000 FGUS76 KPQR 192221 ESFPQR ORZ001-003-005>007-010-011-014>016-WAZ019>022-039-040-045-046- 202100- Hydrologic Outlook National Weather Service Portland OR 321 PM PDT Thu Oct 19 2017 ...HEAVY RAIN LIKELY THIS WEEKEND ACROSS SOUTHWEST WASHINGTON AND PORTIONS OF NORTHWEST OREGON... Heavy rain appears likely this weekend across southwest Washington and northwest Oregon, as a warm front lifts northeast across Oregon and stalls near the Washington border. Meanwhile, a strong and moist Pacific jet stream will run parallel to this front, resulting in areas of heavy rainfall across the Pacific Northwest. While some details remain uncertain, forecast models are showing fairly good agreement in placing the heaviest rain from this event in the higher terrain of southwest Washington and far northwest Oregon. These areas stand to see 4 to 8 inches of rain this weekend, though this precipitation may start out as snow in the higher elevations of the Cascades. Coastal areas of southwest Washington and far northern Oregon are expected to receive 3 to 6 inches of rain this weekend. Meanwhile, the Willamette Valley and Lane County will generally receive 1 to 3 inches of rain with areas farther north in the Willamette and lower Columbia River Valleys most likely to experience the highest rainfall totals. These numbers may still change depending on where the frontal zone stalls. Rainfall intensity may be enough to trigger flash flooding and debris flows downstream of burn scars, particularly near the Eagle Creek Fire in the Columbia River Gorge. While significant rises are expected on many area rivers, mainstem river flooding is not currently forecast at this time. Smaller rivers such as the Grays River near Rosburg will likely be prone to flooding as well. In addition, rainfall rates late Saturday night and Sunday may be high enough to produce urban flooding due to clogged storm drains. The National Weather Service will continue to monitor the rivers closely and issue watches and warnings if needed. People living near southwest Washington and northwest Oregon rivers should monitor the latest weather and river conditions for the next week. Listen to NOAA weather radio or check weather.gov/portland for further updates. $$ Weagle/Neuman

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Page last modified: 19-Oct-2017 10:21 PM
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