Area Forecast Discussion
Issued by NWS Grand Forks, ND

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000
FXUS63 KFGF 051908
AFDFGF

Area Forecast Discussion
National Weather Service Grand Forks ND
108 PM CST Mon Dec 5 2016

.UPDATE...
Issued at 107 PM CST Mon Dec 5 2016

Still seeing some fog around the Devils Lake region, but it has
finally gone away over west central MN. The vsby has been the
worst around Langdon, but still think it will improve shortly
there too. No changes needed at this point.

&&

.SHORT TERM...(Today and tonight)
Issued at 306 AM CST Mon Dec 5 2016

This morning... patchy fog in the Devils Lake Basin will diminish
with daybreak and with midlevel moisture filtering across eastern
North Dakota into the forenoon hours. Low clouds now slung across
the northern Red River Valley and northwest MN will edge slowly
eastward through the morning...but will be overtaken by the
approaching mid and upper level clouds... with chances for a faint
ray of sunshine limited to portions west central Minnesota during
the midmorning hours.

Through the day... diffuse low pressure which is currently digging
into the western Dakotas should coalesce into a strengthening low
pressure center in northeast SD by early afternoon... with light
snow overspreading central and eastern ND. Models are generally
consistent in placing the Low center near ABR around 21z... with
the GFS and NAM blend being the main components of the fcst
package. The NSSL WRF agrees quite well with the 00z GFS package
on overall placement of the main moisture axis into east central
ND and the central RRV from 21z into 00z... while the 06z HRRRx
brings a bit heavier QPF into southeast ND during that time. Have
kept a bit of mixed rain and snow into those far southern RRV
zones during his time... and expect that warmer temps there will
slow and sig snowfall accumulations til the late afternoon and
evening.

Have initiated Winter Weather headlines at 21z for northeast and
east central ND zone... and continued these into northwest MN
after 00z. Heavier accumulations are expected after sundown and
through the overnight hours tonight...with heaviest accumulations
expected across northeast ND and into far northwest MN. Blowing
snow could develop during the early morning period in eastern ND
as the low pressure center pivots into northwest MN... with
blowing snow continuing throughout the day on Tuesday.

.LONG TERM...(Tuesday through Sunday)
Issued at 306 AM CST Mon Dec 5 2016

Tuesday...The Low pressure center is expected to track across
northern MN through Tuesday forenoon and into northwest Ontario
during the afternoon. Winter weather headlines are continued over
the northern four-fifths of the along and north of the BAC-FAR-
DTL-BJI line until early evening. Expect considerable wind to
develop behind the storm system early on Tuesday and to
overspread the area during the day. Blowing and drifting snow are
possible in the headlined areas.

Tuesday night into Wednesday... Some residual light snow and brisk
northerly winds will persist behind the departing low pressure
system well into Wednesday. Much colder air filtering into the
area will push snow ratios above the 20 to 1 range during the
overnight...so some additional accumulations are possible...
though overall moisture amounts will be significantly reduced.

Wednesday Night through Sunday...Cold air will be over the area
behind the exiting storm system Wed night into Thursday.
Wraparound clouds and flurries will persist. The 500 mb flow will
go more zonal but 500 mb heights more suppressed as cold air
lingers over the nrn tier of states. Shortwaves will move east
near this cold air boundary given chances for light snow, with the
next chance Saturday. Temperatures will run below normal for highs
Thursday to Sunday.

&&

.AVIATION...(For the 18Z TAFS through 18Z Tuesday afternoon)
Issued at 107 PM CST Mon Dec 5 2016

Very difficult TAF forecasting period. Expect snow to spread over
the TAF sites this afternoon into early this evening. The most
snow will affect KDVL/KGFK/KTVF...with lesser amounts at KBJI and
KFAR. Really not expecting the wind to increase until around
12-15z Tuesday, and then only for areas along and west of the Red
River Valley. These gusty winds will take longer to reach KTVF and
KBJI. However, once the gusty winds make it into the area on
Tuesday, it will be there for the rest of the TAF period. Have
gone with vsbys on Tuesday in the 1 to 3 mile range, but may have
to drop them down a little more.

&&

.FGF WATCHES/WARNINGS/ADVISORIES...
ND...Winter Storm Warning until 6 PM CST Tuesday for NDZ006>008-
     014>016-024-026>030-054.

     Winter Weather Advisory until 6 PM CST Tuesday for NDZ038-039.

MN...Winter Weather Advisory from 6 PM this evening to 6 PM CST
     Tuesday for MNZ002-003-006-009-016-017-022-023-027.

     Winter Storm Warning from 6 PM this evening to 6 PM CST Tuesday
     for MNZ001-004-005-007-008-013>015.

&&

$$

UPDATE...Godon
SHORT TERM...Gust
LONG TERM...Gust/Riddle
AVIATION...Godon



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