Area Forecast Discussion
Issued by NWS Grand Forks, ND

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FXUS63 KFGF 240304

Area Forecast Discussion
National Weather Service Grand Forks ND
1004 PM CDT Wed Aug 23 2017

Issued at 1004 PM CDT Wed Aug 23 2017

Still seeing a thin line of showers from Hillsboro North Dakota
down through Detroit Lakes and Park Rapids Minnesota. There were a
few claps of thunder as these went through the Grand Forks area
earlier, but there is no more thunder now. High resolution models
show this activity dying out after midnight. The clearing has
moved into areas along the Canadian border. In these clearing
areas, temp and dew point spreads are already pretty close, so
will be watching for fog. Roseau has dropped down to a quarter
mile, but this is probably just shallow localized ground fog.


.SHORT TERM...(This evening through Thursday)
Issued at 320 PM CDT Wed Aug 23 2017

Issue this evening is western extent of precipitation. 500 mb
short wave moving over Winnipeg and this will move toward Bemidji
this evening. Area of rain showers near the path of this vort max.
No thunder anticipated as airmass is very stable along its path.
Farther west is where the issue of any showers come into play.
HRRR/RAP indicate development of showers 22z time pd nr GFK-DVl
and moving south from there. CAPE values are very weak sub 250
j/kg in the RRV so did remove thunder. Will keep idea of
some showers forming but lack of any defined cumulus on latest
vsbl sat pic and lack of instability leads me to question how much
will form in the warm sector of this system. Precipitation will
mostly be in the far southeast by 07z and then exit before 12z.

Clearing into far NW MN overnight and with dry airmass moving back
in some upper 30s to low 40s a good bet Roseau, Baudette areas.

500 mb short wave exiting area Thursday morning with very dry
airmass over far NE ND into nrn MN. An area of mid clouds progged
to move southeast from central into SE ND Thursday daytime. No
precip expected. Temps 70-75 most areas.

.LONG TERM...(Thursday night through Wednesday)
Issued at 320 PM CDT Wed Aug 23 2017

High pressure to drop south into the area late Thursday and move
east Thursday overnight with return flow setting up over E ND and
the RRV. Thus not as cool most areas. Some pockets of mid level
clouds may remain over southern fcst area. Friday will see
increasing clouds south and west as next 500 mb short wave moves
into South Dakota. Rain chances Friday night into Saturday mainly
tied to this system as it moves into central MN Saturday with
highest chances of rain SE ND and WC MN. Northern stream short
wave trough moving into western Manitoba during this period will
concentrate showers in that area...with most of NE ND and far NW
MN in the drier regime between systems, which has been the case of

Guidance agrees nicely during the late weekend through mid week
period of next week. Primary sfc low track is more south of that
projected by yesterday`s runs, but it still seems the MN side would
be most likely to receive the greatest POP chances. Upper wave is
also to the east and with minimal CAPE/positive showalters/lack of
LLJ appears just RW would be the best bet. Chances for thunder
increase east of the valley Sun with daytime heating and proximity
to cold pool aloft. Mon and Tue still looking dry with seasonal
highs in the mid and upper 70s. Potential frontal passage on Wed
may knock temps back down a few by mid week.


.AVIATION...(For the 00Z TAFS through 00Z Thursday evening)
Issued at 702 PM CDT Wed Aug 23 2017

The pcpn moving through the FA will only affect KGFK/KTVF and KBJI
for a few more hours. And this pcpn is not really causing much
impact, as it is falling out of mid level clouds and is not
restricting the vsby. Once this moves out, clearing will spread in
from north to south. With the recent light rain, clearing, and
light winds, there may be some fog around. However it has been
pretty dry in the areas that got the rain, so will hold off on
mentioning any at this point. Thursday looks like a very nice day.




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