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January 2017
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The Week Ahead: Mostly Cold and Dry, Slight Chance of Snow + King Tides

Posted: January 9th, 2017

One more cold snap, then getting warmer and wetter…unless it doesn’t: Last week’s forecasts looked similar.

 

Forecast Summary
• Scattered rain showers today and tonight; slight chance of snow flurries early tomorrow.
• Cold and dry again tomorrow afternoon through early Friday.
• Slightly warmer and showery conditions are expected for the weekend.
• Seasonal high tides will occur Thursday through Monday.
• Extended forecasts suggest wet conditions next week.

 

Water Supply
• last 7-days (yesterday) precip (USGS): 0.08″ – 0.24″
• snowpack (NRCS as of 1/7, Cedar/Sno/Sky): 19″ SWE, 121% normal
• forecast 7-days precip (NWS/WRF): 1.0″ – 1.5″
• max forecast intensity (NWS): 0.51″/24hrs ending 10am Sun
• freezing levels (NWS): 1500′ today, 0′ tomorrow, possibly up to 5000′ on Sat
• forecast 7-day Snow (NWS): 3″ reservoirs, 12″ passes, 20″ ridges

 

Drainage and Wastewater
• last 7-days (yesterday) rainfall (ADS): 0.52″ – 0.70″
• forecast 7-days rainfall (NWS/WRF): 0.3″ – 0.9″
• max forecast intensity (NWS): 0.34″/24hrs ending 10pm Sat
• high-intensity, short-duration rainfall is not likely

 

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

 

JRH