Area Forecast Discussion
Issued by NWS Grand Forks, ND

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840
FXUS63 KFGF 232125 AAA
AFDFGF

Area Forecast Discussion...UPDATED
National Weather Service Grand Forks ND
325 PM CST Thu Feb 23 2017

.UPDATE...
Issued at 325 PM CST Thu Feb 23 2017

Made some slight adjustments to cloud cover but otherwise no
significant changes were made.

&&

.SHORT TERM...(This evening through Friday)
Issued at 216 PM CST Thu Feb 23 2017

With the main winter storm system to brush by to our south tonight
into Friday, the main forecast challenges will be clouds and wind
chills tonight. This afternoon and evening, cloud cover should
decrease a bit from the northwest and northeast as drier air
moves in from the north. Short term models hint at a low level
deck creeping in during the pre-dawn hours Friday over the
northwest, but remaining cloud cover in the southern half of the
area should decrease as the aforementioned storm system moves
away to the east Friday.

With cold air advection forcing temperatures to gradually fall but
models varying a bit in cloud cover, there is still some uncertainty
as to how far temperatures will plummet tonight. Went with a blend
that brings overnight lows into the single digits (north RRV) to the
middle teens (south RRV). Between cold air moving in and wind
staying up overnight, wind chills will fall to near or slightly
below zero Friday morning. Expect temps to recover fairly well
tomorrow with highs in the upper teens to upper 20s.

.LONG TERM...(Friday night through Thursday)
Issued at 216 PM CST Thu Feb 23 2017

An upper low over the upper MS valley will depart the area Fri night
and bring zonal flow aloft to the region Fri night into Sat...with
generally dry weather or a few flurries across portions of far
northeastern ND.  An upper wave associated with a H500 low in
northern Sask/MB then swings across the northern tier Sat
night...bringing a chance for some snow showers over the Devils Lake
Basin overnight. NW flow aloft then brings generally dry but cool
weather Sun and Mon before arrival of potentially the best chance
for accumulating snowfall in the long term period.  As the upper
pattern turns southwesterly a wave out of the northern Rockies by
early Tue.  There is currently significant difference between the
GFS and ECMWF on the timing and amplitude of the upper wave and the
Canadian is very bullish with moisture, which if realized could be
problematic over the RRV.  However, confidence low at this point
given model inconsistencies.  Will remove the likely POPs in the
late Tue aftn and early evening hours while keeping the highest POPs
across w central MN late Tue night.  In general a longer period of
light snow looks possible but the blended solution is being impacted
by the overly bullish GEM.  The work week should generally see highs
in the upper 20s to low 30s with the overnight lows in the mid to
low teens.  This will continue the slow down of the spring melt
brought about by record breaking temperatures last week.  CPC
guidance continues this cool trend into the Day 8 to 14 range, where
signals are indicating higher probabilities of cool and moist in
that timeframe.

&&

.AVIATION...(For the 18Z TAFS through 18Z Friday afternoon)
Issued at 1144 AM CST Thu Feb 23 2017

Expect MVFR cigs to improve by this evening and gradually lift
overnight as drier air begins to move in from the north. North
winds will be fairly steady at or above 10 kts through the period
at most locations due to sfc pressure gradient, except for near
KDVL where winds should lighten overnight and MVFR cigs may
redevelop in the early morning.


&&

.HYDROLOGY...
Issued at 216 PM CST Thu Feb 23 2017

Oslo forecast to go to moderate flood stage by late Sat or early
Sun. Todays river level was not rising as fast as expected an so the
forecast was shifted to a slower rise and a later crest. Note: ice
jamming is not figured into the forecast. With the cooler weather
forecast may change.

&&

.FGF WATCHES/WARNINGS/ADVISORIES...
ND...None.
MN...None.
&&

$$

UPDATE...BP
SHORT TERM...BP
LONG TERM...Speicher
AVIATION...BP
HYDROLOGY...Hoppes



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