Area Forecast Discussion
Issued by NWS Grand Forks, ND

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FXUS63 KFGF 181738
AFDFGF

Area Forecast Discussion
National Weather Service Grand Forks ND
1238 PM CDT Wed Oct 18 2017

.UPDATE...
Issued at 1238 PM CDT Wed Oct 18 2017

Winds picking up across the northern CWA with several sites
reaching advisory criteria. A few spots outside the advisory
bumped up in winds as the frontal boundary moved through, but
quickly went back down again so will not expand the counties at
this time. Dew points have been dropping as strong mixing goes on
so will keep afternoon relative humidity values down into the
teens.

&&

.SHORT TERM...(Today and tonight)
Issued at 336 AM CDT Wed Oct 18 2017

Strong cold front will move east through the forecast area this
morning and midday. 8 mb/3 hr pressure rise with the front and
there is a short period where mixing of the 50kt winds from the
surface may make it to the ground. Otherwise the highest 850 mb
winds do retreat to north of the border during the late morning
and midday when the best mixing occurs and mixing layer goes to
840-820 mb. Will keep wind advisory in effect the NE ND and the
nrn RRV, but for many it will be a high end advisory. Will mention
some blowing dust as well in the NPW. Another thing keeping from a
high wind warning is that the best drying aloft as seen on water
vapor will focus more on southern Manitoba today. Winds to quickly
diminish early evening.

.LONG TERM...(Thursday through Tuesday)
Issued at 336 AM CDT Wed Oct 18 2017

Another warmup is expected for Thursday and Friday as winds become
more southerly and bring warmer temperatures and moisture into the
northern Plains region. Model guidance continues to agree on upper
level ridging over the Plains and southern Canada with a longwave
trough coming on shore in the Pacific North West. Temperatures
Thursday and Friday are expected to warm to the mid to upper 70s
with breezy southerly winds at 15 to 20 mph, especially through the
Red River Valley region.

Overnight Friday into Saturday the upper level wave will begin
ejecting over the Rockies. An associated lee surface low is expected
to develop along the North Dakota/Canadian border. Cool, dry
continental air is expected to push in with this low as a cold
front, impacting the forecast area during the first half of the day
Saturday. Precipitation timing and totals are still uncertain at
this point, with western Minnesota the most likely candidate to see
rainfall. Cooler air behind the front will keep high temperatures
for Saturday in the mid 60s for much of the eastern North
Dakota/west/northwestern Minnesota region.

A cool, but drier Sunday is in store with temperatures in the low to
mid 60s and southwesterly winds at 10 to 15 mph expected. Monday
will see rain chances return as a forecasted shortwave trough
progresses through the region allowing for scattered light rain
showers. Monday and Tuesday will see a return to seasonable
temperatures with highs in the mid 50s and overnight lows dropping
into the 30s.

&&

.AVIATION...(For the 18Z TAFS through 18Z Thursday afternoon)
Issued at 1238 PM CDT Wed Oct 18 2017

All sites are VFR and will remain so throughout the period. Winds
will be the primary issue for the next 24 hours. Gusts above 30
kts will continue at most sites through this afternoon, with some
decrease and gusts around 25 kts during the late afternoon and
evening before winds start really falling off after 02 to 03Z. The
light west to southwest winds will begin shifting around
overnight, so have VRB and less than 6 kts going. Winds will pick
up again out of the south towards the end of the period.

&&

.FIRE WEATHER...
Issued at 340 AM CDT Wed Oct 18 2017

Will upgrade the fire weather watch to a red flag warning and
issue SPS for critical fire weather conditions in WC MN per MIFC.
RH values reach around 20 percent NE ND into far NW MN and with
gusty winds 40-50 mph and dry fuels, any fires that would start
could grow explosively.

&&

.FGF WATCHES/WARNINGS/ADVISORIES...
ND...Red Flag Warning until 7 PM CDT this evening for NDZ006>008-
     014>016-024-026>030-038-039-054.

     Wind Advisory until 7 PM CDT this evening for NDZ006>008-014>016-
     024-026>030-054.

MN...Red Flag Warning until 7 PM CDT this evening for MNZ001>009-
     013>017-022-023.

     Wind Advisory until 7 PM CDT this evening for MNZ001-004-007.

&&

$$

UPDATE...JR
SHORT TERM...Riddle
LONG TERM...AM
AVIATION...JR
FIRE WEATHER...Riddle



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