331 FXUS63 KFGF 082028 AFDFGFArea Forecast Discussion National Weather Service Grand Forks ND 328 PM CDT Mon Sep 8 2025
.KEY MESSAGES...
- There is a 1 of 5 risk for isolated severe thunderstorms through late evening across portions of west central Minnesota. Large hail, up to 1 inch, will be the primary hazard.
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.DISCUSSION... Issued at 328 PM CDT Mon Sep 8 2025
...Synopsis...
Showers and thunderstorms are possible this afternoon, evening, and early overnight hours. H5 shortwave continues southeastward along the downstream side of an approaching ridge. This ridge is expected to move very slowly to the east, displaying characteristics of a standing wave or weak blocking pattern. This is due to deep, H5 troughs on either side of the ridge, with slow movement to the east. Warmer temperatures build into the ridge today through Friday, allowing afternoon highs to climb well into the 70s to low 80s each afternoon. Mid 80s become possible heading into Friday and Saturday before the ridge pushes to the east, giving way to southwest H5 flow. The oncoming flow pattern shows support for showers and thunderstorms as early as Thursday afternoon, with additional precip chances each day through Sunday. While it remains too early to gather exact details, strong storms could be possible late this week and into the weekend due to multiple shortwave passages.
...Isolated Severe Thunderstorms Possible Today...
A weak shortwave is moving across the region this afternoon and evening. A relatively strong 850mb jet is currently moving eastward into west central Minnesota, providing moisture ahead of the shortwave and allowing MUCAPE to climb upwards of 2000 J/Kg. Lapse rates this evening will be high enough to allow a mention of at least a few stronger storms; however, this conditional threat will be somewhat short-lived as the low level jet continues eastward. The primary hazard this evening will be hail up to 1 inch in diameter, with the potential for smaller hail persisting into the early overnight period.
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.AVIATION /18Z TAFS THROUGH 18Z TUESDAY/... Issued at 1218 PM CDT Mon Sep 8 2025
Kept the mention of VCTS out of the TAFs for now. We could see a few thunderstorms mainly along and south of a line from KFAR to KBJI later this afternoon and evening. Overall, VFR ceilings are expected to continue through the TAF period with winds generally at or below 10 knots. Mid level clouds are expected to increase, but are not likely to impact ceilings at this time.
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.FGF WATCHES/WARNINGS/ADVISORIES... ND...None. MN...None.
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DISCUSSION...Lynch AVIATION...Lynch
NWS FGF Office Area Forecast Discussion