Area Forecast Discussion
Issued by NWS La Crosse, WI
Issued by NWS La Crosse, WI
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672 FXUS63 KARX 010335 AFDARX Area Forecast Discussion National Weather Service La Crosse WI 1035 PM CDT Sun Jun 30 2024 .KEY MESSAGES... - A couple of rounds of convection expected Monday night into Tuesday. This could bring another round of heavy rain across the area. Some severe storms could occur Tuesday afternoon and evening. - Additional rainfall will occur Independence Day through Friday. Heavy rain chances appear lower during this period. && .DISCUSSION... Issued at 223 PM CDT Sun Jun 30 2024 Latest 19z surface analysis shows ridge over Minnesota/Wisconsin and Iowa. Subsidence underneath ridge is providing mostly sunny skies and light winds per latest visible satellite imagery/metars. Surface ridge will remain the dominant weather feature tonight into much of Monday and providing dry weather. Then...southwesterly flow pattern develops over the Northern Plains/Upper Great Lakes Region late Monday afternoon into Tuesday. Pieces of energy embedded in the southwesterly flow aloft and vertical motion/moisture convergence associated with the pieces of energy will spread showers/storms into the forecast area early Monday evening and continue into Tuesday. The latest deterministic models/ensembles show around two inches of precipitable water values Monday night into Tuesday. Some of the showers/storms will be efficient rain producers across the area. However...the deterministic/hi-resolution models suggest showers/storms will move quickly over the area and not back build over the same area Monday night into Tuesday. At this time...rainfall amounts of one to two and a half inches are expected across the forecast area from Monday night into Tuesday evening. Severe potential Tuesday afternoon/evening with the second round of convection...is still dependent on how much instability builds during the day. As trends continue to show debris clouds from Monday night convection over the forecast area to inhibit destabilization. Main forecast concerns Wednesday night into Sunday are shower/storm chances mainly from Independence Day into Friday...then lesser rain chances for next weekend. Latest deterministic/ensembles are in better agreement in moving upper level closed low over the Northern Plains/Upper Great Lakes region Independence Day/Friday. Decent lift/moisture convergence in association with the upper level closed low will spread showers/storms in into the forecast area Independence Day. As the upper level low tracks over the forecast area Friday...showers and a few storms will continue across much of the forecast area. Forecast area remains under the influence of the upper level closed low next weekend...and provides lesser shower/storm chances across the forecast area. Temperatures through the forecast period will mainly be in the 70s to lower to middle 80s. && .AVIATION /06Z TAFS THROUGH 06Z TUESDAY/... Issued at 1035 PM CDT Sun Jun 30 2024 VFR conditions expected through this TAF period. Mid to high clouds will increase across the area on Monday ahead of the next system. Winds will ramp up out of the southeast by late morning with gusts of 20 to 25 knots, especially at RST. Winds remain gusty into the evening at RST with a tightening pressure gradient, and initial showers may move into southeast Minnesota by the end of this TAF period before steadier rain moves in after 06Z -- have introduced VCSH at RST. && .HYDROLOGY... Issued at 223 PM CDT Sun Jun 30 2024 Minor to moderate flooding continues along the Mississippi River and will continue into this week. Additional rainfall is expected Monday night into Tuesday evening. At this time...rainfall amounts of 1 to 2.5 inches is expected across the area. With the antecedent conditions across the region...water levels will rise on area rivers and flash flooding will be possible. Interests along rivers...streams and creeks should monitor the latest forecast and trends Monday night into Tuesday. && .ARX WATCHES/WARNINGS/ADVISORIES... WI...None. MN...None. IA...None. && $$ DISCUSSION...DTJ AVIATION...Kurz HYDROLOGY...DTJ