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Area forecast discussion 
National Weather Service Norman OK 
523 PM CST Sat Nov 21 2009 


Aviation... 
a band of MVFR ceilings extending from northern OK into SW OK and 
western North-Texas will continue to gradually thin out during the 
evening hours. However... areas of fog will form overnight 
especially in portions of central and SW OK where the low clouds 
persisted through much of the day. Meanwhile... an upper level 
trough moving into The Four Corners area will spread high clouds 
east into the Southern Plains overnight. 


&& 


Previous discussion... /issued 301 PM CST Sat Nov 21 2009/ 


Discussion... 
slow but continual erosion of thin cloud band from around Wichita 
Falls up through okc and pnc expected to continue through the 
late afternoon. This particular area will be the most likely area 
to see areas of dense fog tonight into Sunday morning. Outside of 
this region...fog not expected to be quite as extensive and should 
be fairly patchy or non-existent across far western and northwest 
Oklahoma where winds will stay up overnight. Weak frontal boundary 
that enters western portions of Oklahoma tomorrow forecast to 
dissipate before having large sensible effect on region...outside 
of winds shifts over western half of County Warning Area. 


Stronger front with upper support still forecasted to affect region 
Monday afternoon and Monday night...with scattered showers and 
possibly a thunderstorm mainly over central/southeast parts of 
Oklahoma. This new airmass will not be overly cool...being Pacific 
and downsloped rocky air. Development of large northern/Central 
Plains trough/cutoff will allow some Canadian air to make it down 
into region as early as Thursday. We lowered temperatures Thursday and 
early Saturday based on this fact...with latest European model (ecmwf) catching on 
to GFS lower level evolution. Outside of possible drizzle/low 
clouds behind the Canadian surge early Thursday...extended portion 
of forecast will remain dry. 


&& 


Preliminary point temps/pops... 
Oklahoma City OK 44 64 44 64 / 0 0 0 0 
Hobart OK 45 63 38 65 / 0 0 0 0 
Wichita Falls Texas 44 67 43 64 / 0 0 0 0 
gage OK 39 61 32 55 / 0 10 0 0 
Ponca City OK 45 61 42 60 / 0 10 0 10 
Durant OK 45 66 45 65 / 0 0 0 0 


&& 


Oun watches/warnings/advisories... 
OK...none. 
Texas...none. 
&& 


$$ 


26/11/32