Area Forecast Discussion
Issued by NWS Bismarck, ND

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FXUS63 KBIS 160236
AFDBIS

Area Forecast Discussion
National Weather Service Bismarck ND
936 PM CDT Sun Apr 15 2018

.UPDATE...
Issued at 936 PM CDT Sun Apr 15 2018

Quiet weather continues as high clouds slide through western and
portions of central North Dakota.

UPDATE Issued at 640 PM CDT Sun Apr 15 2018

Quiet weather continues. Only change needed was to adjust cloud
cover a bit to address high clouds over far western North Dakota.

&&

.SHORT TERM...(This evening through Monday)
Issued at 214 PM CDT Sun Apr 15 2018

Quiet weather continues in the short term period.

Another cold start to the day on Monday with lows mainly in the
teens over central and eastern North Dakota, some upper single
digits are not out of the question between Bismarck and Jamestown
and northward toward Garrison and Rugby where more snow remains.

A little warmer most areas on Monday. However, it will be windy
Monday afternoon over western ND. Bufkit soundings and NAM/GFS
boundary layer winds and lapse rates indicate the potential for
Advisory criteria winds in the west. Will not issue anything now
and give the overnight shift a chance to see if this trend
continues. We did utilize the MOS based model blend for winds on
MOnday which were more representative than our given blend.

.LONG TERM...(Monday night through Sunday)
Issued at 214 PM CDT Sun Apr 15 2018

Strong winds in the west Monday spread into central ND Monday
night in response to developing low pressure over the northern
high plains ahead of a splitting upper level trough. We bumped up
winds Monday night and Tuesday. Tuesday winds are not as strong
though as the pressure gradient weakens as the main surface low
becomes established over the central plains.

Over the northern plains, an inverted surface trough remains over
western ND on Tuesday, moves slowly into central ND Tuesday night
and weakens on Wednesday as the surface low pulls away and upper
support is sheared between a northern stream trough and the main
upper low that joins up with the surface low over the upper
midwest. The combination of the low level convergence associated
with the inverted trough and mid and upper level forcing from the
splitting upper level trough will produce an are of light
precipitation that tracks slowly across western and central ND
late Monday night through Wednesday.

Model consensus is low with this feature. The NAM/GFS are faster
and wetter than the ECMWF/GEM with the QPF pattern as it tracks
across the forecast area. The main problem with that is our
blended solution for ProbIce grids is a mess, and when combined
with 6 hour Pop/QPF grids, overdoes the threat of freezing rain.
Forecast soundings from across the CWA do show a small potential
for freezing precip, if any precip would reach the ground, on the
leading edge of the precip. And another very small potential on
the back side of the system. Will keep a mention of freezing
precip but will downplay it for now.

After this system exits, expect mainly dry conditions with a slow
warming trend through Sunday

&&

.AVIATION...(For the 00Z TAFS through 00Z Monday evening)
Issued at 640 PM CDT Sun Apr 15 2018

VFR conditions expected through the forecast period. Gusty
southeasterly winds develop on Monday over western North Dakota.


&&

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

$$

UPDATE...JJS
SHORT TERM...TWH
LONG TERM...TWH
AVIATION...JJS



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