Area Forecast Discussion
Issued by NWS Bismarck, ND

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FXUS63 KBIS 172033

Area Forecast Discussion
National Weather Service Bismarck ND
333 PM CDT Sat Mar 17 2018

.SHORT TERM...(This evening through Sunday)
Issued at 243 PM CDT Sat Mar 17 2018

The main focus for the short term is fog tonight and mixed
precipitation developing afternoon tomorrow.

Tonight, warmer and more moist air starts to be advected in. Low
stratus is alread forming across southwest North Dakota in
response to this return flow. Low stratus will continue to develop
and overspread most of western and central North Dakota tonight.
An upslope component to the winds will further aid in the
development of stratus and eventually fog late tonight. Fog may
become dense in some of the vallyes later tonight.

Tomorrow, the next storm system approaches North Dakota. Several
small upper level waves will rotate around the main upper level
circulation currently located in the Pacific Northwest. One such
wave will swing through southwest North Dakota Sunday afternoon.
This will combine with developing frontogenesis to spark an area
of precipitation oriented southwest to northeast across western
North Dakota. The evening hours on Sunday will see a period where
there is support for banded precipitation with frontogenesis, an
upper level jet streak and fairly steep mid level lapse rates. The
period of highest precipitation rates will be late Sunday
afternoon and Sunday night. With temperatures in the critical
threshold of mid 30s there could be mix of rain, freezing dirzzle
and snow Sunday afternoon and evening.

.LONG TERM...(Sunday night through Saturday)
Issued at 243 PM CDT Sat Mar 17 2018

The focus in the extended will be the Sunday and Monday period.

There continues to be some uncertainty in the snow amounts,
however, we are seeing convergence on a location of highest
accumulation. It appears west central North Dakota, locations
generally between Bismarck and Dickinson, will see the highest
accumulations. There appears to be a good chance for at least four
inches over west central North Dakota for Sunday night and
Monday. We continued the Special Weather Statement, with headlines
possible later tonight/tomorrow.

Tuesday through Thursday will see a building ridge across the
Northern Plains which will suppress precipitation, but another
rather robust negatively tilted upper low is forecast to move from
the northwest US into the Northern Plains by Friday. This will
provide another opportunity for precipitation, both rain and snow.


.AVIATION...(For the 18Z TAFS through 18Z Sunday afternoon)
Issued at 1240 PM CDT Sat Mar 17 2018

Widespread MVFR cigs remain over western and much of central North
Dakota. This will spread east this evening with ceilings lowering
to IFR/LIFR overnight into Sunday morning.




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