Area Forecast Discussion
Issued by NWS Grand Forks, ND
Issued by NWS Grand Forks, ND
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439 FXUS63 KFGF 111725 AFDFGF Area Forecast Discussion National Weather Service Grand Forks ND 1225 PM CDT Tue Jun 11 2024 .KEY MESSAGES... - Scattered thunderstorms Wednesday afternoon east of the Red River Valley with a marginal chance for severe storms. - More rain chances this weekend into next week with a 30% chance for more than 1" over a 3 day period. && .UPDATE... Issued at 1213 PM CDT Tue Jun 11 2024 Skies remain mostly clear with sustained winds approaching 30 mph in some locations. This should be peaking within the next few hours before diminishing as the main system continues to trudge northeastward. For this reason, impacts should be sub- advisory criteria and a Wind Advisory is not anticipated. UPDATE Issued at 940 AM CDT Tue Jun 11 2024 Showers have cleared the area entirely and some stratocumulus has developed along the backside of the main surface low. Impacts through the day will continue to be very limited with the only impact being gusty winds in the 20s this afternoon. UPDATE Issued at 618 AM CDT Tue Jun 11 2024 Showers have moved out except in the far east where some sprinkles will remain through 8am. Watching to see how dewpoints behave today and if we will will need to lower them to better capture min RH through so far no indication to stray from forecast. Skies clearing behind the line of showers with winds expected to pick up by 9am with the gustiest conditions in northeast North Dakota where wind gusts up to 35 mph could be seen. Remainder of the forecast is on track. && .DISCUSSION... Issued at 319 AM CDT Tue Jun 11 2024 ...Synopsis... Showers currently moving east across northwest Minnesota this morning along a cold front with the attendant low northwest of Brandon Manitoba. As the low continues east amid westerly 500mb flow we begin to dry out with mid level ridging building in through the day. Steep near sfc lapse rates remain today, helping to maximize momentum transfer and create breezy conditions today as we remain well mixed. RH as low as the mid 30s with sustained winds in the low 20s gusting over 30mph in northeast North Dakota will create good burning conditions. Unlikely to approach near critical conditions with the limited RH potential but gusty winds may still create difficult conditions at times. ...Wednesday severe... Beyond today ridging continues to shift east with aid from another low amplitude trough and attendant cold front Wednesday afternoon. High based thunderstorms (~2000m) are expected to form along and ahead of this front. Primary forcing will be in northwest Minnesota in the afternoon with only a 70% chance for SBCAPE to exceed 1500 J/KG in our area. Bulk shear of 50+ kts (largely aided by strong 700-500mb flow) will support organized convection with wind up to 60 mph and hail to 1 inch, though early runs of higher res CAMs covering this period generally show the greatest threat to be to our south and east. A slower mid level trough could bring the threat further into our area but the trend has been for a more progressive wave over the past 24 hours. With the core of the ridge overhead Wednesday expect the warmest day of the year for most thus far across the region with highs widely reaching into the 80s with a few areas in the valley seeing enhanced mixing from downslope westerly winds off the escarpment possibly helping a few areas tap the 90 mark. At least it will be a dry heat with Tds in the 50s. Cooling off back into the 70s for the Thursday/Friday period with westerly flow aloft keeping us in a warm and dry continental airmass. ...Weekend rain chances... Surprisingly good agreement between global ensembles later in the week that long wave ridging will yield to a shortwave passing to our south amid southwest flow bringing warm air advection and deformation type rain to the upper midwest late week with a 40% chance for > 0.25". A second more potent pacific northwest trough then propagates east thorugh the weekend arriving in the Northern Plains/ Canadian Prairies early next week with better overall synoptic support through ensembles diverge by the weekend on timing and track limiting confidence past the initial late week wave. && .AVIATION /18Z TAFS THROUGH 18Z WEDNESDAY/... Issued at 1213 PM CDT Tue Jun 11 2024 VFR ceilings will prevail for the TAF period, with isolated MVFR for all TAF sites except FAR possible through 00z. After that, winds will diminish this evening and skies will remain VFR. Low level wind shear will arise after 06z and last through at least 14z. Thunderstorms may develop around 16-18z near GFK/FAR but confidence is too low to add TSRA to the TAF. && .FGF WATCHES/WARNINGS/ADVISORIES... ND...None. MN...None. && $$ UPDATE...Perroux/TT DISCUSSION...TT AVIATION...Perroux