Area Forecast Discussion
Issued by NWS Grand Forks, ND

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FXUS63 KFGF 141514
AFDFGF

Area Forecast Discussion
National Weather Service Grand Forks ND
1014 AM CDT Thu Sep 14 2017

.UPDATE...
Issued at 1012 AM CDT Thu Sep 14 2017

Fog over the lakes region slowly lifting but added fog for another
hour to the forecast. Otherwise only other changes were to adjust
pops with current rain band.

UPDATE Issued at 710 AM CDT Thu Sep 14 2017

Well defined vort and spin with the rain entering the DVL
basin/east central ND at 12z. This area of rain will diminish
somewhat but move ENE thru the nrn/central RRV and into NW MN thru
the morning. Upped pops for a period of likelies in its path. No
further changes.

&&

.SHORT TERM...(Today and tonight)
Issued at 331 AM CDT Thu Sep 14 2017

Challenging pop fcst today and tonight. Water vapor shows a decent
short wave over north central SD producing some convection nr the
SD/ND border SSW of Bismarck all night long with expanding area of
light rain northeast of it toward NE ND. Spotty showers on radar
into NE ND. But initially most if not all is drying up in the dry
low levels before reaching the ground. Thus radar vs actual rain
on the ground is deceiving. Very short range CAMs are not handling
situation all that great, but idea is for area of showers to move
ENE into the RRV 12z-18z diminish some as they do. Afternoon will
see some remaining shower chances...but trends are toward low
pops. Now about severe chances. SPC day 1 has Bemidji-Fargo
southeast in marginal risk for t-storms that may form north of a
sfc boundary located at 08z nr PKD-FFM line. This sfc boundary
will drop a bit more south today to nr a Wadena-Wheaton MN line.
This is a bit farther south than was shown yesterday. Idea from
NSSL WRF is for some convection to form north of the boundary in
WC MN (nr DTL-BJI zone) very late aftn/early eve. Shear is
ok...but instability and forcing aloft isnt all that great.
MUCAPES from NAM and NSSL WRF show 2500 j/kg but global models are
a bit less. So high uncertainty on strength of any storms that
may fire later today in WC MN. Risk goes into SE ND but CAMs show
little support there.

.LONG TERM...(Friday through Wednesday)
Issued at 331 AM CDT Thu Sep 14 2017

Friday morning should see limited activity before main, stronger
500 mb system moves northeast into the area in the aftn/eve.
Surface low on 00z GFS is farther south than other models and
keeps better instability central/southern MN with a more general
rain in our area. They do agree with track of 500 mb vort in
keeping heaviest stratiform rains over NW 1/2 fcst area where an
inch of rain still likely. GFS seems a bit fast with system
pulling out so will go a bit slower and keep showers into
Saturday...though more scattered. North winds and clouds will keep
temps quite cool with 50s to low 60s for highs.

For Sunday thru Wednesday....
Long wave trough remains over the western US while a long wave
ridge over western Canada gets replaced by a long wave trough.
Long wave trough over the Canadian Maritime will shift a little
east through the period. Long wave ridge over essentially remains
over eastern North America.

The GFS was a faster solution than the ECMWF. The GFS was trending
slightly faster while the ECMWF was trending slower. Prefer the
slower ECMWF solution. Upper level trough moves out of the area Sun
morning.

Little change to high temperatures for Sun and Wed. High temps were
increased a degree or two for Mon and increased a degree for Tue
from yesterdays forecast.

&&

.AVIATION...(For the 12Z TAFS through 12Z Friday morning)
Issued at 710 AM CDT Thu Sep 14 2017

Several challenges. Bemidji area maintains the dense fog. Frontal
boundary slipping south so should see a bit of north wind develop
as the morning progresses and slow improvement. Same at DTL/PKD.
Otherwise do have local areas of MVFR stratocu that has formed
over parts of E ND into NW MN, incl GFK/TVF areas. Uncertain
if/when they clear out...but if/when they do mid cloud deck. FAR
stands the best chc of VFR today. May have to watch for lower
level ceilings to develop/spread over the area after 06z Fri.


&&

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

$$

UPDATE...Voelker
SHORT TERM...Riddle
LONG TERM...JH/Riddle
AVIATION...Riddle



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