


Area Forecast Discussion
Issued by NWS Grand Forks, ND
Issued by NWS Grand Forks, ND
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493 FXUS63 KFGF 262131 AFDFGF Area Forecast Discussion National Weather Service Grand Forks ND 431 PM CDT Thu Jun 26 2025 .KEY MESSAGES... - There is a 2 out of 5 risk for severe thunderstorm chances for late Friday afternoon into evening, as well as on Saturday. && .DISCUSSION... Issued at 345 PM CDT Thu Jun 26 2025 ...Synopsis... Weak mid level wave can be seen on water vapor imagery moving through the tri-state area into northern Minnesota. This is resulting in light rain for southeast ND, west-central MN, and into north-central MN. With dry air near the low levels and lack of instability combined with weak forcing with this wave, very little is anticipated in terms of accumulation, generally less than three tenths of an inch. As this wave departs, lingering low clouds and cooling overnight may result in areas of fog overnight into early morning Saturday within the Red River Valley, eastern ND, and portions of west- central MN. Some fog may be dense. For Friday, instability increases over central ND by late afternoon. This develops ahead of a low amplitude shortwave trough moving out of the northern High Plains into SK/MB by Friday evening, with attendant weak front draped north to south across western ND. The shortwave will provide sufficient wind shear and forcing to bring a chance for strong to severe thunderstorms within portions of central North Dakota into perhaps the Devils Lake basin by sunset Saturday. Eventual upscale growth is favored as storms trek east/southeast during the overnight hours, potentially bringing strong to severe storms within the rest of eastern ND into portions of MN before sunrise Saturday. Depending on evolution of storms Friday night, ongoing storms may be strong to severe Saturday morning. Guidance does favor a lull in thunderstorm activity around midday Saturday before additional thunderstorms become possible again, most likely near west-central MN. These may be strong to severe. Longwave trough and attendant cold front moves through the region overnight Saturday or Sunday morning, ushering in dryer conditions. Northwest flow and drier air mass intrusions should promote below average precipitation, lower thunderstorm chances, as well as near average temperatures. ... Severe risk for Friday and Saturday ... Should storms be more discrete (more likely for locations closer to central ND like Devils Lake basin), large hail to size of golf balls along with wind to 70 mph. Eventual upscale growth would favor smaller hail but still holding the potential for gusts to 70 mph. Tornadoes are unlikely given the overall lack of low level shear oriented in an unfavorable orientation with respect to expected storm motion. There is a small subset of guidance that even shows lack of thunderstorms with capping too strong for forcing associated with the shortwave aloft bypassing the region as it moves quicker into Canada. Low level jet develops out of South Dakota, which should continue to promote upstream development of thunderstorm segments closer to southeast ND into west-central MN overnight hours of Friday into early Saturday. Saturday, rich instability axis moves south and east, with a surface low/trough development in eastern SD into central MN. Majority of guidance favors development on the northern flank of rich instability, which may still be in portions of west-central Minnesota by peak heating. Should storms develop here, all hazards including large hail and tornadoes will be possible, particularly during the first 3 hours of initiation before upscale growth is then favored to pull thunderstorms deeper into MN and out of our area. && .AVIATION /18Z TAFS THROUGH 18Z FRIDAY/... Issued at 136 PM CDT Thu Jun 26 2025 Area of IFR to MVFR ceilings will continue at TAF sites like KFAR and KBJI through at least 15Z. There is a medium chance for additional IFR to MVFR ceilings at other sites between 06Z-15Z, in addition to low chance for dense fog at KDVL, KFAR, and KGFK. Chose to leave the fog out of TAFs for now given low confidence in its occurrence over these areas. Otherwise, lighter winds under 10kt will prevail, excluding KBJI where winds between 10-20kt out of the northeast will prevail through 00Z. && .FGF WATCHES/WARNINGS/ADVISORIES... ND...None. MN...None. && $$ DISCUSSION...CJ AVIATION...CJ