Area Forecast Discussion
Issued by NWS Bismarck, ND

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686
FXUS63 KBIS 241143
AFDBIS

Area Forecast Discussion
National Weather Service Bismarck ND
643 AM CDT Wed May 24 2017

.UPDATE...
Issued at 640 AM CDT Wed May 24 2017

For early morning update have added areas of fog over portions of
the James River Valley where fog has developed, including the
Jamestown area. Expect this to deteriorate within the next few
hours. Otherwise, going forecast is in good shape.

&&

.SHORT TERM...(Today and tonight)
Issued at 330 AM CDT Wed May 24 2017

The main focus for today is shower and thunderstorm chances later
this afternoon/evening.

An upper level wave will slowly push across southern Canada
tonight and tomorrow. This wave will drag a cold front across the
Northern PLains this evening. Ahead of the front strong return
flow will kick in. This will bring gusty winds around 30 mph and
warmer temperatures to the region. Across western North Dakota
where compressional warming will be maximized ahead of the cold
front temperatures in the upper 70s to low 80s seem likely.

There won`t be much moisture available for this system, so while
shear values will be favorable for thunderstorm development,
instability will be limited, so only isolated thunderstorms are
expected late this afternoon and early evening across far western
North Dakota.

.LONG TERM...(Thursday through Tuesday)
Issued at 330 AM CDT Wed May 24 2017

By Thursday the showers will be departing to the east and
cooler temperatures into the 60s to around 70 seam reasonable.
Not getting a lot of cold advection from this shortwave trough
that initially tracks across the southern Prairie Provinces of
Canada. But then the GFS dumbbells this upper low across the
Northern Plains through the weekend keeping an extended period of
scattered showers and cool temperatures through Memorial day
weekend, especially Sunday. The ECMWF is a bit warmer and dryer
through Sunday then brings a cold front through Monday. So with
this disagreement between global models will keep the Superblend
guidance for the weekend which gives moderate chances of showers
and slightly cooler temperatures through the Memorial Day weekend.

&&

.AVIATION...(For the 12Z TAFS through 12Z Thursday morning)
Issued at 640 AM CDT Wed May 24 2017

Areas of fog near KJMS are resulting in LIFR conditions, though
this should improve by 13z. Otherwise, VFR conditions continue
over remaining areas. Later this afternoon into this evening rain
showers, with possibly an isolated thunderstorm, will move west to
east across the region. Localized MVFR visibility will be possible
in heavier showers.

&&

.BIS WATCHES/WARNINGS/ADVISORIES...
Frost Advisory until 9 AM CDT /8 AM MDT/ this morning for
NDZ019>023-025-034>037-042-045>048-050-051.

&&

$$

UPDATE...JJS
SHORT TERM...AJ
LONG TERM...AJ
AVIATION...JJS



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