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January 2017
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The Week Ahead: Heavy Rain Tonight, Showers After

Posted: January 17th, 2017

Been a little while…

 

Forecast Summary
• A strong system will provide heavy rain and wind tonight and tomorrow.
• The NWS has issued a Winter Weather Advisory and an Avalanche Watch for the Cascades.
• Cool, showery conditions are expected to linger through at least Saturday.
• Extended forecasts suggest normal, cool and showery conditions next week.

 

Water Supply
• last 7-days (yesterday) precip (USGS): 0.00″ – 0.08″
• snowpack (NRCS as of 1/15, Cedar/Sno/Sky): 18″ SWE, 102% normal
• forecast 7-days precip (NWS/WRF): 3″ – 5″
• max forecast intensity (NWS): 1.52″/12hrs ending 10am tonight
• freezing levels (NWS): 7000′ today, 5000′ tomorrow, gradually lowering to under 2000′ by Sat
• forecast 7-day Snow (NWS): 1″ reservoirs, 3″ passes, 14″ ridges

 

Drainage and Wastewater
• last 7-days (yesterday) rainfall (ADS): 0.12″ – 0.17″
• forecast 7-days rainfall (NWS/WRF): 2″ – 3″
• max forecast intensity (NWS): 1.26″/24hrs ending 10am tomorrow
• high-intensity, short-duration rainfall is likely with frontal passage this evening, and with post-frontal showers tomorrow

 

Resources
NWS Area Forecast Discussion
NWS Forecast Tables
Extended Forecast (NAEFS, Select Seattle)
@SPU_WX

 

JRH