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Area Forecast Discussion
Issued by NWS La Crosse, WI
Issued by NWS La Crosse, WI
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701 FXUS63 KARX 200401 AFDARX Area Forecast Discussion National Weather Service La Crosse WI 1101 PM CDT Fri Jul 19 2024 .KEY MESSAGES... - Slightly below normal temperatures and largely diurnal showers and storms are favored over the next week. && .DISCUSSION... Issued at 155 PM CDT Fri Jul 19 2024 18z WV satellite reveals an upper ridge over the western CONUS and troughing in the east with resulting northwesterly flow aloft over the CWA. This general pattern looks to remain in place through the seven day forecast, leading to temperatures just a few degrees below normal for July with highs mainly around 80 or in the lower 80s. Additionally, while enough moisture is available at 850mb to lead to potential convection each afternoon - with the exception of this afternoon as warm 800-600mb temperatures look to keep a lid on things - lack of robust moist advection and anemic shear profiles suggest the risk for heavy rainfall and severe thunderstorms will be very low. Indeed, LREF joint probabilities and CSU ML outlooks continue to suggest scant risk for severe convection and modeled PWATs remain under 1.5", not notable compared to model climatology. Coverage of convection each afternoon and the potential for it to persist into the nighttime hours will depend on timing of upper impulses in the northwesterly flow aloft, with the slow moving trough seen across guidance Tuesday into Wednesday the best bet for persistent scattered convection. && .AVIATION /06Z TAFS THROUGH 06Z SUNDAY/... Issued at 1101 PM CDT Fri Jul 19 2024 MVFR to low-VFR cigs are likely across the region during the late morning and early afternoon hours as the 20.02z RAP shows fairly robust low-level saturation. With mid-level cooling expected, this should aid in marginally better instability profiles during the day tomorrow which will in turn help develop more aggravated cumulus and showers and isolated storms as well with diurnal heating. Consequently. decided to hold a VCSH at KRST to address these diurnal showers and isolated storms. Coverage in showers and storms will diminish during the evening hours. Winds will remain around 5 kts through the TAF period from the south/southwest. && .ARX WATCHES/WARNINGS/ADVISORIES... WI...None. MN...None. IA...None. && $$ DISCUSSION...Ferguson AVIATION...Naylor