Area Forecast Discussion
Issued by NWS Bismarck, ND

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FXUS63 KBIS 201446
AFDBIS

Area Forecast Discussion
National Weather Service Bismarck ND
946 AM CDT Wed Sep 20 2017

.UPDATE...
Issued at 939 AM CDT Wed Sep 20 2017

Current forecast looks in line. Updated latest sensible weather
elements and interpolated to late morning values.

UPDATE Issued at 621 AM CDT Wed Sep 20 2017

With skies clearing behind the cold front in broad subsidence
expect considerable sunshine today with low level winds mixing to
the surface. Current forecast looks good.

&&

.SHORT TERM...(Today and tonight)
Issued at 440 AM CDT Wed Sep 20 2017

Main highlight today will be near critical fire weather conditions
southwest this afternoon. Please refer to the fire weather discussion
below for more details. Otherwise, breezy, but dry weather dominates
the short term period.

Potent shortwave trough from Tuesday is now pushing into southern
Manitoba into Minnesota. Large scale subsidence behind this upper
trough per latest GOES16 satellite imagery dominates today with
mostly sunny conditions. BUFKIT soundings exhibit 20kt to 28kt
winds in the mixing layer today. Expect southwesterly surface
winds increasing to around 20 mph this afternoon, with gusts
around 30 mph. High temperatures will be in the mid to upper 60s.

Water vapor imagery shows an elongated upper low/trough sprawled
out from southwestern British Columbia into southwest Saskatchewan.
For tonight, an area of synoptic scale ascent ejecting from
Oregon and Idaho will weaken as it moves into eastern Montana and
western/central North Dakota. Low level warm air advection/vertical
motion increases across southern North Dakota tonight as 850mb
winds begin to increase between 40kt and 50kt. With increased
ascent/vertical motion west and central, expect an increase in
clouds tonight. Overnight lows will range from 40F northwest to
lower 50s far south central.

.LONG TERM...(Thursday through Tuesday)
Issued at 337 AM CDT Wed Sep 20 2017

An upper level low/longwave trough develops in the intermountain
west Thursday/Friday, then slowly edges east into the northern
high plains by Tuesday. The end result is a cooling trend with
increasing chances for showers through the long term period.

For Thursday, a subtle cold front will slide west to east, but get
hung up in the southern James River Valley Thursday night as the
front parallels the southwest flow aloft. A few showers along the
front in the north central and Turtle Mountains are possible
during the day. Highs Thursday will range from the mid 60s west
to around 80F in the southern James River Valley. A low level jet
will be in place Thursday night with increasing instability in the
far southeast. SPC has the the southern James River Valley in a
Marginal Risk through 12z Friday. NAM BUFKIT for Oakes certainly
has potential for elevated thunderstorms and will continue to
monitor this area in future runs.

Increasing jet dynamics and shortwaves ejecting from the longwave
trough will enhance large scale ascent and result in increasing
showers across western/central ND Friday through Sunday. Brunt of
the forcing shifts east Monday/Tuesday as the upper trough scoots
through. Slight chances continue but not as wet as the weekend.
Temperatures will cool into the 50s Saturday through Monday, then
rebound into the lower 60s Tuesday.

&&

.AVIATION...(For the 12Z TAFS through 12Z Thursday morning)
Issued at 939 AM CDT Wed Sep 20 2017

Mostly clear skies will remain across the region in broad
subsidence in wake of departing cold front. This will maintain VFR
at all TAF sites today. Gusty southwest winds 15 to 25kts between
16-00z. Low level wind shear KBIS- KJMS expected after 06Z.

&&

.FIRE WEATHER...
Issued at 440 AM CDT Wed Sep 20 2017

Near critical fire weather conditions are expected across southwest
North Dakota this afternoon. Southwesterly winds sustained
at/near 20 mph will briefly coincide with minimum relative
humidities between 20 and 25 percent. Due to the limited areal
coverage, and short/intermittent duration (2 to 3 hours), no fire
weather highlights are warranted at this time.

&&

.BIS WATCHES/WARNINGS/ADVISORIES...
NONE.
&&

$$

UPDATE...TWH
SHORT TERM...KS
LONG TERM...KS
AVIATION...TWH
FIRE WEATHER...KS



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