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   PID: Synchronet 3.21a-Linux master/123f2d28a Jul 12 2025 GCC 12.2.0   
   TID: SBBSecho 3.28-Linux master/123f2d28a Jul 12 2025 GCC 12.2.0   
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   WAZ000-112048-   
      
   Mesoscale Precipitation Discussion 1262   
   NWS Weather Prediction Center College Park MD   
   951 AM EST Thu Dec 11 2025   
      
   Areas affected...portions of western Washington State   
      
   Concerning...Heavy rainfall...Flash flooding possible   
      
   Valid 111448Z - 112048Z   
      
   Summary...Ongoing moderate to heavy rainfall will continue to   
   foster excessive runoff and flood/flash flood issues through at   
   least 20Z/noon Pacific time.   
      
   Discussion...A persistent atmospheric river continues to spread   
   areas of moderate to heavy rainfall across the discussion area.=20   
   Recent rain rates ranging from 0.15-0.5 inch/hr have been noted -   
   especially in terrain-favored upslope areas of the Cascades.  The   
   rainfall was tied to strong 700mb flow perpendicular to the   
   Cascades and 1 inch PW values - supporting abundant orographic   
   ascent and precipitation.  Unfortunately, these rain rates were   
   continuing to impact inundated areas that have experienced 6-10   
   inches of rain over the past 72 hours, with widespread,   
   significant riverine flooding being reported as a result.   
      
   Rainfall could continue for another 4-6 hours across the region.=20   
   Eventually, models depict a weakening of 700mb flow over the   
   Cascades as mid/upper ridging builds northward into the region.=20   
   This may reduce acute flash flood potential, though riverine   
   issues will likely continue for some time.   
      
   Cook   
      
   ...Please see https://urldefense.com/v3/__http://www.wpc.ncep.noaa.gov__;!!=   
   DZ3fjg!-ImXPjaEKxXDP2MXZn5DlOqZ-jEGbNw9fZaPqxDHzK7LZF4ZyYLNeT4WwF3zvzlNd8sy=   
   HiRwBZt23t60q5z8yF4V1K8$  for graphic product...   
      
   ATTN...WFO...OTX...PDT...PQR...SEW...   
      
   ATTN...RFC...PTR...NWC...   
      
   LAT...LON   48592119 48222044 47562035 46522081 46302172=20   
               46582328 47552397 48042403 48322289 48502243=20   
   =20=20=20=20=20=20=20=20=20=20=20=20   
      
   =3D =3D =3D   
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