


Area Forecast Discussion
Issued by NWS Milwaukee/Sullivan, WI
Issued by NWS Milwaukee/Sullivan, WI
437 FXUS63 KMKX 300306 AFDMKX Area Forecast Discussion National Weather Service Milwaukee/Sullivan WI 1006 PM CDT Sun Jun 29 2025 .KEY MESSAGES... - Showers and storms ending late tonight. Areas of fog possible. - Scattered thunderstorms are possible Monday primarily for south central and southeast WI, as the cold front moves through the area. Gusty winds and small hail are possible with the strongest storms. - Chances for showers and thunderstorms returns later in the week, along with warmer and more humid conditions. && .UPDATE... Issued 908 PM CDT Sun Jun 29 2025 The initial outflow boundary has shifted south into nrn IL but still with plenty of convection from the MKE metro area to the IL border. Another area of showers and storms over Iowa and Lafayette Counties will continue ewd but gradually weaken into the early morning hours. This area of precipitation is expected to be the last of it for the night. Areas of fog may develop given the moist conditions and light winds. The slow moving cold front will then pass on Monday with still a few showers and storms possible. Gehring && .SHORT TERM... Issued 100 PM CDT Sun Jun 29 2025 This afternoon through Monday night: Later this afternoon the lake breeze may be enough to trigger a few storms near the lake shore. This remains uncertain given some capping but a few CAMs do support a few weak cells generated off the boundary. The main thing to watch however, is for the storm development northwest of the CWA in association with a shortwave aloft out ahead of the surface front in addition to a weak remnant boundary from overnight convection. Where storms initiate will be very important this afternoon because while instability is plentiful in the 2000-3000 J/kg (MUCAPE) range, the shear is pretty weak overall with at most 20 kts of deep layer shear from most models. This suggests that storms will not likely be able to maintain strength as the outflows are likely to out run convection pretty quickly. However, upon initiation there will be some 1000-12000 J/kg of DCAPE in this region and thus storms could easily produce a few severe gusts though this would likely be closer to where storms initiate before the gust front outruns the storms. The other thing to watch for is the potential for pop up convection firing along outflows from the convection developing to northwest which could become the primary risk though CAMs do not support this type of outcome at this point. This will bring the greatest risk for severe gusts to the northwest parts of the CWA with lesser risk as storms expect to move southeast. By the late evening and early overnight most of the convection is expected to slide out with quieter conditions through the rest of the overnight period. Most of the CAMs actually push the front out of most of the region overnight largely bringing west to northwest winds back to the region for Monday. Into the day Monday another system developing across the Central Plains will slide largely south of the region but should allow for southern WI to get clipped which should include a period of showers and perhaps a few storms as well with potential focus along a lingering cold front. The broad precip shield will largely be associated with the upper level trough pushing through bringing PVA across most of the region with enough moisture for showers at least. However various factors make this fairly uncertain especially with how things develop in the lower levels and the progression of the front and low level dry air which may complicate how expansive rain showers could be. In addition there is uncertainty with how northward we could see storms Monday afternoon but right now the far southeast CWA has the best chance for a strong to possibly even severe storm. The better severe storm potential revolves around the deep layer shear being in the 35-45 kt range with enough instability. By Monday night this system will push out as high pressure fills in behind with weak ridging gradually pushing in. Kuroski && .LONG TERM... Issued 100 PM CDT Sun Jun 29 2025 Tuesday through Sunday: Middle of the week we will largely be dominated by ridging to the west and troughing to the east in a meridional flow pattern. High pressure tracking through the Central Plains and south of the CWA will help keep us dry Tuesday and Wednesday though Wednesday night into Thursday a some shortwave activity swinging off the troughing in northern Ontario. This will be something to monitor especially as timing changes at all but there at least appears to be a decent chance for storms Wednesday night through at least some of Thursday. Ridging will move overhead later in the week and likely keep the region dry with higher pressure overhead for at least a few days (later Thursday into Saturday). This may change however as there is fairly decent precip chances that will ride over the ridge during this period and minor changes in the track of the ridge could change what we see. However for now that remains the current trend with The ridge gradually weakening and sliding out late in the weekend and bringing the potential for showers and storms back late Saturday into Sunday. Uncertainty is certainly high later on as the upper levels become fairly erratic in models. Kuroski && .AVIATION... Issued 908 PM CDT Sun Jun 29 2025 Showers and storms ending early Mon AM with areas of fog possible afterward. Areas of vsbys of 1-3SM BR with local 1/2SM FG. The fog will dissipate by 13-14Z Mon. Sct-bkn030-040 for the late morning and afternoon with showers and storms possible due to the passage of a cold front. Gehring && .MARINE... Issued 100 PM CDT Sun Jun 29 2025 South to southeast winds have increased today and will turn south to southwest tonight, as weak high pressure moves east of the region. A weak cold front will approach the region from the Upper Mississippi River Valley later this afternoon into tonight, moving across the region overnight into Monday. Southwest winds will become west behind the front later Monday into Monday night. Showers and some thunderstorms may accompany the frontal passage. West winds should generally linger into the middle of the week. Kuroski && .MKX WATCHES/WARNINGS/ADVISORIES... WI...None. LM...None. && $$ Visit us at weather.gov/milwaukee Follow us on Facebook, Twitter, and YouTube at: www.facebook.com/NWSMilwaukee www.twitter.com/NWSMilwaukee www.youtube.com/NWSMilwaukee