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December 2016
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The Week Ahead: Cold and Snow Repeat

Posted: December 12th, 2016

 

Forecast Summary
Similar pattern to last week…
• No NWS advisories in effect; however King Tides are this week.
• Diminishing shower activity today, possible rain/snow convergence zone event this afternoon.
• Cold and dry tomorrow and Wednesday.
• Light snow/rain possible on Thursday/Friday.
• Extended forecasts suggest near normal conditions.

 

Water Supply
• last 7-days precip (USGS): 0.7″ – 0.9″
• snowpack (NRCS): 7.4″ – 15.4″ SWE, 106% – 177% normal
• forecast 7-days precip (NWS/WRF): 0.5″ – 1.0″
• max forecast intensity (NWS): 0.28″/24hrs ending 10pm Thu
• freezing levels (NWS): spiking to 2000′ today.
• forecast 7-day Snow (NWS): 7″ reservoirs, 13″ passes, 14″ ridges.

 

Drainage and Wastewater
• last 7-days rainfall (ADS): 0.83″ – 1.01″
• forecast 7-days rainfall (NWS/WRF): 0.5″ – 0.8″
• max forecast intensity (NWS): 0.27″/24hrs ending 10pm Thu
• high-intensity, short-duration rainfall/snow is possible this afternoon with convergence zone.
• minor tidal flooding possible daily; however forecast pressure and wind are favorable for minimizing impacts.

 

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

 

JRH