358 
fxus63 kfsd 061552 rra 
afdfsd 


Area forecast discussion for southeast South Dakota/southwest Minnesota/northwest Iowa 
National Weather Service Sioux Falls South Dakota 
1055 am CDT Sat Sep 6 2008 


Discussion... 
active short term forecast today with band of showers entering 
western portions of forecast area and fog lingering in northwest 
Iowa. Have raised probability of precipitation mainly west of I 29 throughout the day for 
mainly light shower activity. Kicr has picked up 15 hundreths of an 
inch thus far and expect amounts to be similar in far western County Warning Area. 
As band shifts east...focus should shift further south as 
frontogenetic band develops along the Missouri River. This band is 
expected to lift northeast through the overnight hours...and have 
begun the trend of raising probability of precipitation. The other concern is the lingering 
fog across northwest Iowa...especially down near the Sioux City 
area. Cloud cover hampering mixing...so expect fog to gradually 
lift through the late morning hours. Low clouds and fog has really 
limited warming...and have trimmed highs back a few degrees. 
Updated forecast posted. 


&& 
Aviation... 
lingering fog across northwest Iowa especially in the River Valley 
near Sioux City should gradually lift late this morning. A band of 
light rain showers will shift east through eastern South Dakota with 
an upper level disturbance near the Nebraska border. These showers 
should not produce restricted ceilings or visibilities. Shower 
activity is expected to become more widespread into the evening and 
overnight a trough pushes ewrd. 


&& 
Previous discussion... 
areas of fog east of i29 should dissipate early this morning as higher 
clouds move in eliminating any additional rad cooling. Focus shifts 
to this afternoon and overnight as short wave pushes eastward across the northern plains. 
Clouds associated with feature should spread across all of County Warning Area this morning 
with mostly cloudy skies expected today. With cool air in place...temperatures will 
be affected by cloud cover and will be several degrees below norm. Most 
places should see highs from 65 to 70...although a few places could see lower 
70s. Think bulk of rain will hold off until tonight...but will spread 
chance into west and far southern County Warning Area this afternoon. Looks like a good chance of r 
across County Warning Area tonight. Could be an isolated thunderstorm but not Worth mentioning. 
Rainfall amounts will generally be light...pbly less than 0.25 most 
places. Will see some lingering rain shower- across eastern County Warning Area Sun morning...with some 
breaks in the clouds west spreading east during the afternoon. Still will be 
chilly with highs in the 60s. Yet another short wave will move across Nebraska late 
Sun night into Monday and will need to keep chance of rain shower mainly S of i90 late 
sun into Monday. Not much if any moderation in high temperatures on Monday...and 
pbly will be a little cooler S due to more clouds and precipitation. Monday night 
should be coolest night of the week. May need to watch for patchy 
frost pot across eastern County Warning Area Tuesday morning as surface high drops into Iowa. Would 
expect light winds and mostly clear skies by Tuesday morning. Should warm up 
nicely Tuesday into Wednesday with temperatures back into 70s and lower 80s. Looks 
like a decent chance of thunderstorm Wednesday afternoon/night ahead of next short wave and cold front. 
Of course it will be highly dependent on timing and how much llm 
returns ahead of short wave. 




&& 


Fsd watches/warnings/advisories... 
South Dakota...none. 
Minnesota...none 
Iowa...none. 
NE...none. 


&& 


$$