158 FXUS63 KFGF 211513 AFDFGFArea Forecast Discussion National Weather Service Grand Forks ND 1013 AM CDT Sun Sep 21 2025
.KEY MESSAGES...
- Warmer then average through the week with dry weather expected.
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.UPDATE... Issued at 1013 AM CDT Sun Sep 21 2025
Fog has mostly burned off across most of the area, A few spots are still shoing low visibility but web cams show coverage is pretty limited and will let the SPS drop. Adjusted cloud cover for the eastern half of the CWA as they should continue to see at least some clouds for much of the day.
UPDATE Issued at 632 AM CDT Sun Sep 21 2025
Patchy dense fog has been common across northeast North Dakota this morning with the most persistent area low vis across Cavalier and Towner. Have issued an SPS across the Devils Lake region until 10am for this reason though fog (occasionally dense) does exist outside the SPS area and motorist should thus be cautious this morning. Remember to use your low beams in areas of fog and to slow down.
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.DISCUSSION... Issued at 250 AM CDT Sun Sep 21 2025
...Synopsis...
A very perturbed flow pattern across the northern plains will eventually give way to an omega block by the end of the week with the current group of upper lows continuing their eastward drift with a PNW trough diving south through the northern rockies early in the week becoming the eastern feature in the omega block as it dips into the southeast and deepens. During this time plains riding dominates Wednesday and beyond leading to increasing temperatures with highs in the 70s and lows in the 50s or about 10 degrees above average.
Southwest CONUS troughing then locks the ridge in place with a polar jet across the Canadian prairies becoming increasingly amplified and lifting as far north as the Arctic circle by the end of next weekend meaning weak flow through the northern plains with minimal impetus for shortwave activity once the current activity clears the area today. In the meantime fog ongoing in northeast North Dakota with clearing skies allowing for efficient radiational cooling though the coverage is porous enough that I still cant quite justify a dense dog advisory despite pockets meeting criteria. Will likely opt for an SPS by 4/5am closer to when people are waking up if things haven`t filled in yet. Looking east into north central Minnesota our showers that just wont go away look to actually clear out this afternoon.. fingers crossed. Not expecting much if any additional accumulation but maybe a tenth before things officially end today. Clouds clearing west to east late today with clear skies for most tomorrow as highs reach the upper 70s in the west and low to mid 70s in the east for a nice fall day. As skies are expected to be mostly clear tomorrow with light winds once again expecting fog potential with the primary focus east of the Red River Valley. Finally as alluded to above with ridging dominating this week minimal chances for impactful weather the next several days with occasional fog likely the main thing to watch for.
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.AVIATION /12Z TAFS THROUGH 12Z MONDAY/... Issued at 632 AM CDT Sun Sep 21 2025
IFR to LIFR at TVF, BJI, and DVL this morning with MN sites due to cigs and DVL due to fog. Both concerns should abate by mid morning with cigs gradually lifting to MVFR at all sites by 18z. Light winds will do little to fight off fog formation tonight in central MN and for that reason added some low vis for BJI in the later period of the TAF. VFR skies today from 18z to maybe as late as 06z today.
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.FGF WATCHES/WARNINGS/ADVISORIES... ND...None. MN...None.
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UPDATE...JR/TT DISCUSSION...TT AVIATION...TT
NWS FGF Office Area Forecast Discussion