


Area Forecast Discussion
Issued by NWS Twin Cities, MN
Issued by NWS Twin Cities, MN
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656 FXUS63 KMPX 271746 AFDMPX Area Forecast Discussion National Weather Service Twin Cities/Chanhassen MN 1246 PM CDT Fri Jun 27 2025 .KEY MESSAGES... - After a busy few days, much quieter and drier weather today. - Another period of active weather starts tonight into the weekend with strong to severe storms possible. - Much hotter on Saturday with heat index values returning to the 90s. && .DISCUSSION... Issued at 310 AM CDT Fri Jun 27 2025 Today and Tonight... Lingering moisture and cooling diurnal temperatures has allowed for low stratus and fog/mist to persist. There is also enough broad synoptic forcing from the shortwave that there is also some drizzle, mainly in western Wisconsin, this morning. As temperatures rise after sunrise this low stratus drizzle/fog will clear. With high pressure moving in we should even see the sun for part of the day today, allowing temperatures to warm up into the 70s. This brief period of nice weather will not last though, as a return to more unsettled weather arrives tonight. A favorable convective environment with steep lapse rates, low level moisture, and instability will be present over the Dakotas later today. This should lead to convective development to our west. These storms will track across the Dakotas and into Minnesota tonight. For this reason SPC has a slight risk in western Minnesota. As the evening goes on low level shear should improve along the nose of the low level jet and allow for the formation of supercells. If supercells form they could be long lived and track deeper into Minnesota. The other potential for Minnesota impacts would be if the cells can grow upscale into an MCS, which is shown in some CAMs such as the 06Z HRRR. Overall a cap will make CI unlikely over Minnesota, but elevated instability and favorable shear will allow convection from the Dakotas to maintain strength. Severe threats would depend on convective mode with wind the main risk for an MCS with wind and hail for any discrete cells. This weekend... As Friday`s high moves out a warm front will pass through the Upper Midwest this weekend. This warm and moist air advection will drive heat index values up into the 90s on Saturday. So not the 100s we saw a week ago, but still quite hot. This moist, unstable airmass with frontal forcing and a broad trough will provide a favorable environment for thunderstorms. This has given us a slight risk from SPC and a marginal ERO from WPC. Storms appear most likely in the evening to early overnight hours. A very unstable airmass with upwards of 4000 J/kg of CAPE, sfc-3km SRH over 300 m2/s2, and precipitable water values of over 1.75" all suggest an environment primed for deep convection. In this environment supercells would be possible and therefore= all severe threats possible. The biggest question now is where in the broader risk area will CI occur? This will be a key focus of mesoanalysis as this period approaches. By Sunday we should be on the back side of this system, which will bring down heat index values and the severe threat. We will still see some synoptic support for additional rain, especially early in the day. Next week... Higher pressure once again to start the week with Monday and Tuesday looking like nicer, sunnier days with max temperatures near 80. By the middle of the week the active weather looks likely to return. Global ensembles all have QPF in this period however amounts, location of QPF, and timing all still vary among membership. So it remains too early for many details on this beyond a Wednesday/Thursday timeframe for the next round of activity. && .AVIATION /18Z TAFS THROUGH 18Z SATURDAY/... Issued at 1232 PM CDT Fri Jun 27 2025 MVFR conditions will continue through the afternoon hours, then expect improvement to VFR as clouds scatter this evening. Wind shift from the N/NW to SE by late afternoon, generally around 5 to 10 kts. Latest hi-res guidance brings a line of storms through late tonight into early Saturday morning. While there is confidence we`ll see a complex of storms move into MN overnight, the exact track is less certain. I`ve opted to go with PROB30s given the uncertainty on track/coverage of the thunderstorm complex. Impacted terminals can expect a brief dip to MVFR/IFR conditions while the storms move through. KMSP...Most likely timing for storms would be around early to mid morning Saturday. PROB30 highlights the best period for the complex to move through. An additional round of thunderstorms are possible Saturday evening that may require another PROB30 with the 00z TAFs. /OUTLOOK FOR KMSP/ SUN...MVFR/RA likely, chc TSRA/IFR. Wind SW 5-10 kts. MON...VFR. Wind NW 10-15 kts. TUE...VFR. Wind NW 10-15 kts. && .MPX WATCHES/WARNINGS/ADVISORIES... MN...None. WI...None. && $$ DISCUSSION...NDC AVIATION...BPH