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   FOUS30 KWBC 250747   
   QPFERD   
      
   Excessive Rainfall Discussion   
   NWS Weather Prediction Center College Park MD   
   247 AM EST Tue Nov 25 2025   
      
   Day 1   
   Valid 12Z Tue Nov 25 2025 - 12Z Wed Nov 26 2025   
      
   ...THERE IS A MARGINAL RISK OF EXCESSIVE RAINFALL FOR PORTIONS OF=20   
   THE SOUTHEAST AND SOUTHERN APPALACHIANS, AND ALSO FOR THE COASTAL   
   PACIFIC NORTHWEST...   
      
   ...Southeast states...   
      
   The storm system crossing the southern tier states will continue=20   
   to have a plume of Gulf moisture surging north ahead of the cold=20   
   front through Tuesday afternoon, mainly from southeastern=20   
   Mississippi to the southern Appalachians. The magnitude of the=20   
   rainfall and also the coverage is expected to wane compared to=20   
   yesterday as the storm system becomes more elongated and=20   
   progressive. Recent CAM guidance has swaths of QPF maxima on the   
   order of 1.5 to 3 inches from central Alabama to eastern Tennessee   
   and western North Carolina, with the RRFS taking some of the   
   heavier rains as far north as the Kentucky state line. Only small   
   changes were necessary to the inherited Marginal Risk area, with a   
   modest extension northward to include more of the southern   
   Appalachians, and a little farther westward to areas closer to the   
   Mississippi border.   
      
   ...Pacific Northwest...   
      
   A marginal atmospheric river event will affect the coastal ranges   
   and the Cascades from central Oregon northward through Tuesday   
   night, followed by lighter precipitation going into Wednesday.   
   There will not be much instability to work with, so this will tend   
   to keep rainfall rates in check, but the duration of moderate   
   rainfall with rates near 0.25 inches per hour leading to areas of   
   1-2 inch daily rainfall totals may just be enough to lead to some   
   localized instances of minor flooding from the northern coastal   
   ranges of Oregon to the Olympic Peninsula. The timing for this has   
   also sped up some, to the point where the majority of the rainfall   
   is now expected in the Day 1 period instead of the Day 2 period,   
   so no areas are necessary at this time beyond 12Z Wednesday for   
   this region.   
      
   Hamrick   
      
      
   Day 2   
   Valid 12Z Wed Nov 26 2025 - 12Z Thu Nov 27 2025   
      
      
      
      
   Day 3   
   Valid 12Z Thu Nov 27 2025 - 12Z Fri Nov 28 2025   
      
      
      
      
   Day 1 threat area: https://urldefense.com/v3/__https://www.wpc.ncep.noaa.go=   
   v/qpf/94epoints.txt__;!!DZ3fjg!6BeywFq4gmao9MoL-vyboNXAcluDylKd79WacLfyA_UY=   
   AjkVEFrUVY0wLWV_W-A2FN4_KDNkL0XTnPqQo9QSJ7ugp3I$=20   
   Day 2 threat area: https://urldefense.com/v3/__https://www.wpc.ncep.noaa.go=   
   v/qpf/98epoints.txt__;!!DZ3fjg!6BeywFq4gmao9MoL-vyboNXAcluDylKd79WacLfyA_UY=   
   AjkVEFrUVY0wLWV_W-A2FN4_KDNkL0XTnPqQo9QSkonZvH8$=20   
   Day 3 threat area: https://urldefense.com/v3/__https://www.wpc.ncep.noaa.go=   
   v/qpf/99epoints.txt__;!!DZ3fjg!6BeywFq4gmao9MoL-vyboNXAcluDylKd79WacLfyA_UY=   
   AjkVEFrUVY0wLWV_W-A2FN4_KDNkL0XTnPqQo9QSyKcw09g$=20   
      
   =3D =3D =3D   
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