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fxus63 kfsd 151912 

Area forecast discussion
National Weather Service Sioux Falls South Dakota
112 PM CST sun Dec 15 2019

Short term...(this evening through monday)
issued at 110 PM CST sun Dec 15 2019

The shortwave trough moving across the region this afternoon will
continue to produce light snowfall as it moves eastward. Snowfall
rates have be low, with 1 to 2 tenths per hour, which lines up well
with expectations. Accumulating snow ends west of I-29 by 6pm CST,
with lingering light accumulations through 9pm for locations east of
the Interstate. Storm total snow remains in the half to 2 inch
range, with the higher amounts in the southern forecast area, near
Sioux City Iowa.

Mid- and low-level cloud decks will largely remain in place
overnight, although some clearer skies are likely further west near
Chamberlain South Dakota. With recent snowfall and cold temperatures, it could
be hard to get near-surface saturation, but a few high-resolution
models hint at the potential for patchy fog. Light surface winds and
breaks in the clouds over south central to southeast South Dakota keep this a
possibility, and have added some patchy fog mention to the early
morning forecast for Monday. Daytime temperatures will be in the
teens and twenties on Monday, with light west winds.

Long term...(monday night through sunday)
issued at 110 PM CST sun Dec 15 2019

The rest of the week continues to look very quiet weather-wise.
Siouxland will remain north of the jet stream, with dry
northwesterly and westerly flow aloft through the end of the week. A
ridge moving through Wednesday and Thursday will promote light
southerly flow, with temperatures rising to near normals. On Friday
and Saturday, a distinct cut-off low pressure moves through the
Southern Plains, keeping the northern plains dry and under the weak
deformation field north of the low. No significant weather is
expected through next weekend.


Aviation...(for the 18z tafs through 18z Monday afternoon)
issued at 1159 am CST sun Dec 15 2019

Light snow will continue through the afternoon and evening hours.
Accumulations will remain light, but snowfall will reduce surface
visibility while it is falling. Winds remain light this afternoon
and overnight, with 5 to 10 kt prevailing winds. Patchy fog is
possible overnight into Monday morning as the clouds clear and
surface winds remain light and variable.


Fsd watches/warnings/advisories...
South Dakota...none.


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