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FXUS63 KMPX 300031 AFDMPX

Area Forecast Discussion National Weather Service Twin Cities/Chanhassen MN 731 PM CDT Mon Apr 29 2024

KEY MESSAGES

- Slight Risk (level 2 of 5) of severe weather for south central Minnesota Tuesday afternoon for the next round of showers & thunderstorms. The main threats are damaging wind and large hail, and an isolated tornado or two can't be ruled out.

- Pattern to remain active with rain chances every 24 to 48 hours, with another widespread soaking rain looking likely Thursday and more showers possible Saturday and again early next week.

DISCUSSION
Issued at 324 PM CDT Mon Apr 29 2024

It's yet another soggy Spring day across the Upper Midwest. The sfc low is pivoting over top of E MN this afternoon accompanied by scattered showers impacting portions of central and eastern Minnesota. Elsewhere, mist & drizzle persist with light winds present. Showers & drizzle will gradually taper off through the afternoon. Temperatures will stagnant where they've been all day, in the upper 40s, due to the weak low level flow & expansive stratus deck overhead. As I alluded to yesterday, this is a perfectly fine mid-March day we're observing in late April. Jokes aside, we'll see the low level stratus scatter out by Tuesday sunrise across MN and late morning for west central WI. This will cause areas in W & C MN to cool into the mid to upper 30s tonight and there could be patchy frost in these areas. Elsewhere we'll "cool" into the lower 40s.
We'll have a brief reprieve between weather systems tonight thru Tuesday morning.

Our attention turns to Tuesday, specifically Tuesday afternoon, as a warm front will open the door for our next round of showers & thunderstorms. An impressive shortwave will dig into the north central CONUS Tuesday. This will push through a thermal ridge during the day with temperatures warming into the upper 60s and lower 70s.
With that surge of WAA comes moisture & the threat of severe weather. Forecast soundings across south central Minnesota show between 500 to 1000 J/Kg CAPE with a very favorable shear environment conducive to organized severe weather. A closer look at the wind profiles show long, curved hodographs that should do the heavy lifting under the weaker thermal environment. A low CAPE/high shear set up along and infront of the cold front can produce all severe hazards, despite the limitations of instability & lapse rates should keep constraints on the event. Storms look to develop Tuesday afternoon in the eastern Dakotas before tracking into SW and W MN.
The updated day two maintained the slight risk across portions of south-central MN and a marginal risk through the Twin Cities and west central WI. Updraft helicity tracks suggest we'll see storms weaken as they move west to east with a declining severe threat.
Outside of the severe threat, guidance trends maintain that we'll see another good soaking rain. QPF forecasts are between 0.5 to 0.75" across much of the area with the potential for locally higher amounts in areas with training convection in SC MN.

Temperatures remain seasonal beyond Tuesday with highs in the 60s through the weekend. There isn't any big warm up on the way... at least for now. The pattern will drive another system through Thursday and we'll remain on the cold side so severe concerns will remain to our south. This will bring another opportunity for widespread rain with a half inch to an inch seeming more and more plausible as close in. Friday will dry out and see the return of our old friend gusty wind. It'll be below advisory criteria so it'll be nothing more than a nuisance for those out and about. The weekend will offer yet another chance for rain on Saturday as a wave ejects from the western CONUS BUT the spread in guidance is too significant for anything more than chance PoPs.

AVIATION /00Z TAFS THROUGH 00Z WEDNESDAY/
Issued at 719 PM CDT Mon Apr 29 2024

Drier air will slowly move across the region this evening which should lift ceilings. Overnight winds will become light and switch to the southeast Tuesday morning. Patchy fog and low stratus could redevelop again by morning before the winds pick up out of the southeast. On Tuesday afternoon a line of showers and thunderstorms will move in from southwest Minnesota. A few storms could be strong to severe.

KMSP...MVFR ceilings this evening with light drizzle at times.
Winds will be out of the west, but then decrease which could lead to IFR stratus/fog at times for Tuesday morning. Looking ahead, southeast winds will increase on Monday, with rain and thunderstorms likely during the afternoon/evening.

/OUTLOOK FOR KMSP/ WED...VFR. Wind W 5-10 kts.
THU...MVFR/-SHRA likely. Wind E 10-15 kts.
FRI...VFR. Wind W 10-15G25kts.

MPX WATCHES/WARNINGS/ADVISORIES
MN...None.
WI...None.

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