Area Forecast Discussion
Issued by NWS Sioux Falls, SD
Issued by NWS Sioux Falls, SD
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823 FXUS63 KFSD 030424 AFDFSD Area Forecast Discussion National Weather Service Sioux Falls SD 1124 PM CDT Sun Jun 2 2024 .KEY MESSAGES... - The severe threat will diminish through the remainder of the night, though a few heavier storms could produce heavy rainfall before showers and storms exit the area after 10Z. - Tuesday may be the next chance for severe weather, but will be dependent on recovery from scattered morning convection and timing of a cold front pushing through the region. Favored area for an isolated severe threat is along and east of the MN/IA Highway 60 corridor. - Quiet weather and seasonable temperatures are expected to prevail mid to late week. Possibly some breezy periods, especially Thursday and Friday. && .DISCUSSION... Issued at 211 PM CDT Sun Jun 2 2024 Still some question marks regarding the evolution of the convection tonight. Still plenty of instability, roughly 2000-2500 J/kg, with moderate deep layer shear around 40 knots. This is plenty to support isolated supercells capable of producing golf ball sized hail and wind gusts to 70 mph. One thing to watch late this afternoon and early this evening is whether or not a marginally low LFC and some decent turning in the low level winds could support isolated tornadoes. The best chance for supercells, large hail and isolated tornadoes will be west of I-29 and likely around the James Valley and points west. Showers and thunderstorms will progress eastward through the evening and overnight. Without a stronger east to west instability gradient and no LLJ really impinging on the area storms may remain more scattered instead of forming into a distinct line of storms. This may limit the extent of the wind threat and keep it more isolated. A linear system is not impossible, but maybe a little less likely. After about 9z most of the activity will be out of the area. The next wave of interest moves onto the Plains Monday night and should bring an area of showers and thunderstorms through. Given marginal instability of about 1000 to 1500 J/kg and weak to moderate shear severe storms should remain isolated. There is a bit of a dry layer below about 700 mb which could aid in supporting some stronger wind gusts. This threat will linger through the morning, then with the faster timing of the front areas near and east of highway 60 in southwest MN and northwest IA will see a short window around mid afternoon when a few stronger storms could develop but a good chance most severe weather in the afternoon and evening will be east of the area. Wednesday should be warm and windy behind the exiting wave. Suspect wind gusts around 35 mph with highs from the mid 70s to lower 80s. Thursday through Sunday should prove to be seasonally warm and mainly dry. A deepening low pressure over the Great Lakes and increasing upper level ridging across the Rockies leaves the area in northwest flow. Suspect with the deep northwest flow each day should be a touch breezy, especially Thursday and Friday when some upper level energy rotates around the backside of the low pressure over the Great Lakes. && .AVIATION /06Z TAFS THROUGH 06Z TUESDAY/... Issued at 1114 PM CDT Sun Jun 2 2024 The severe threat is diminishing across the area, though isolated to scattered thunderstorms may produce heavy rain. The thunderstorm activity will end from west to east through 10Z. Winds will become light later tonight, and could result in patchy fog toward Monday morning. By mid morning on Monday, VFR conditions are expected through the remainder of the TAF period. && .FSD WATCHES/WARNINGS/ADVISORIES... SD...None. MN...None. IA...None. NE...None. && $$ DISCUSSION...08 AVIATION...JM