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November 2016
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The Week Ahead: Showery and Cool

Posted: November 14th, 2016

 

Forecast Summary
• Diminishing shower activity today, convergence zone possible to the north.
• A series of systems will provide additional showers through Wednesday.
• Drier and cooler conditions are expected late Wednesday through early Friday.
• Extended forecasts suggest a wet weekend and showery conditions beyond.

 

Water Supply
• Last 7-days precip (USGS): 0.8″ – 1.9″
• Forecast 7-days precip (NWS/WRF): 2.0″ – 3.0″
• Max forecast intensity (NWS): 1.0″/24hrs ending 4pm Tue
• Freezing levels: dropping from ~5000′ today to <3000' by Wednesday
• A few inches of snow are expected at pass level, perhaps 12" on ridges, this week.
• Strong mountain gap easterly winds are likely toward the weekend.

 

Drainage and Wastewater
• Last 7-days rainfall (ADS): 0.35″ – 0.75″
• Forecast 7-days rainfall (NWS/WRF): 1.0″ – 1.5″
• Max forecast intensity: 0.50″/24hrs ending 4am Wed
• High-intensity, short-duration rainfall is possible with north end convergence zone today and tomorrow.

 

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

 

JRH