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FXUS63 KMPX 292025 AFDMPX

Area Forecast Discussion National Weather Service Twin Cities/Chanhassen MN 325 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.

- 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 /18Z TAFS THROUGH 18Z TUESDAY/
Issued at 1241 PM CDT Mon Apr 29 2024

BR & DZ continue to cause VIS & CIGS down to IFR levels this afternoon. It will be a slow improvement to the MVFR cigs through the day, but by the end of the day, most terminals should be MVFR. Ceilings will slowly scatter out overnight, returning most locations to VFR by Tuesday morning. A few hires model soundings try to redevelop low clouds overnight and clearing them around sunrise Tuesday for MN terminals west of MSP. By mid morning all sites return to VFR. Winds are tricky due to the sfc low ontop of the Twin Cities. Winds will turn more southwesterly then westerly as the low exits to our northeast. Winds will shift back to the southeast on Tuesday and remain between 5 to 10kts.

KMSP... DZ & BR will continue to plague MSP for the near term.
VIS should begin to improve as winds turn more westerly by 20-21Z. Latest RAP soundings suggest we'll scatter the stratus at MSP between 12z and 15z Tuesday. Added a PROB30 to highlight the next round of potential SHRA/TSRA Tuesday 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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