Area Forecast Discussion
Issued by NWS Des Moines, IA
Issued by NWS Des Moines, IA
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322 FXUS63 KDMX 311054 AFDDMX Area Forecast Discussion National Weather Service Des Moines IA 554 AM CDT Fri May 31 2024 ...Updated for the 12z Aviation Discussion... .KEY MESSAGES... - Spotty showers this morning will restrengthen this afternoon with non-severe thunderstorms moving across the area. - Quiet Saturday with showers and storms possible Sunday into Monday. - More robust system Tuesday into Wednesday could be our next chance for strong to severe storms. && .DISCUSSION... Issued at 228 AM CDT Fri May 31 2024 Convection in western Iowa fizzled out overnight with a few spotty, slow moving showers lingering early this morning. Meanwhile, a cold front sits northwest of the area, across South Dakota into Nebraska with a line of convection continuing to bubble early this morning. This will pass into Iowa later this morning, moving across the area through the afternoon and evening. With diurnal heating as support, showers will strengthen and become more widespread. Even so, the severe risk today remains low with very little instability to work with. Soundings do continue to show fairly dry low levels, so it is possible that some stronger gusts develop with shower and storm activity this afternoon. A few showers may linger in eastern Iowa on Saturday morning, but otherwise it should be a nice day with temperatures nearing 80 degrees. By Sunday the next wave moving though the zonal upper air pattern makes its way towards Iowa. Models are initially rather diffuse with the boundary before the system better organized later Sunday. As such, it is possible that most of Sunday would be dry before precipitation develops later in the day but confidence in the details is low at this time. The wave looks to pass across the area later Sunday into Monday. There is a little more instability to work with in this system however shear still remains fairly modest. So while a few stronger storms are possible, as it currently stands the severe chance looks to remain low in Iowa. A more robust system is still on track for Tuesday into Wednesday. While timing differences still exist between the Euro and GFS, there is still a signal in both for a more wrapped up system with greater instability up into the area. There is some indication that better shear may lag the instability a bit. While details are still vague, this system will likely be the next opportunity for strong to severe storms across the area. && .AVIATION /06Z TAFS THROUGH 06Z SATURDAY/... Issued at 553 AM CDT Fri May 31 2024 Scattered showers will slowly move across the area through the day with thunderstorms possible by this afternoon as they strengthen. This system is very slow moving, so impacts will be prolonged as showers linger through the overnight and finally start to push off to the east on Saturday morning. Precipitation will be most widespread north at KFOD/KMCW with less confidence in impacts further south at KDSM/KALO/KOTM. Due to the scattered nature of the precipitation, pinning down the most likely window is a challenge. Expect adjustments as trends are realized. && .DMX WATCHES/WARNINGS/ADVISORIES... None. && $$ DISCUSSION...Hagenhoff AVIATION...Hagenhoff