Area Forecast Discussion
Issued by NWS Sioux Falls, SD
Issued by NWS Sioux Falls, SD
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170 FXUS63 KFSD 242249 AFDFSD Area Forecast Discussion National Weather Service Sioux Falls SD 449 PM CST Sun Nov 24 2024 .KEY MESSAGES... - A very good (60-80%) chance for a band of light rain/snow from south central South Dakota into central Minnesota during the late afternoon and evening. Snowfall amounts most likely will remain below 0.5" most locations, but there is a moderate (40%) probability of around 1.0" near the Highway 14 corridor, especially on the SD side. - Below to well below normal temperatures move in Monday and persist through the Thanksgiving holiday week. Confidence is high (>80%) that temperatures will remain below freezing from Thanksgiving onward, with moderate (40-60%) chances that highs will not reach 20F in some areas on Friday-Saturday. Friday morning and Saturday morning wind chills below zero most locations. - Light precipitation chances remain low, with chances for light snow/flurries peaking at 10-20% Wednesday night and again Friday night into Saturday. Those with more distant travel plans will want to monitor forecast trends though, with higher precipitation chances south of I-80 and in North Dakota/northern Minnesota during the holiday travel period. && .DISCUSSION... Issued at 217 PM CST Sun Nov 24 2024 A fairly strong (125 knot) jet streak will move from the Central Rockies into NE and southern SD this evening. As this jet max moves onto the Plains colder air in the low levels will begin to surge southward, with an expansion of snow vs. rain potential. Many of the newest model runs have come in with a bit more snow, mainly close to highway 14, but generally less than a couple of inches. Will bump amounts in mostly Kingsbury and Beadle counties to 1-1.5" of snow, with quickly decreasing amounts to the south towards I-90. Farther south saturation aloft is more difficult so mainly drizzle is expected, which would be over far southeast SD, northeast NE and northwest IA. The main thing to watch for in this area is if temperatures drop below 32 with drizzle some slick surfaces will be possible on Monday morning. Rigth now it looks like the colder air lags and comes in with the cold front, so the icing threat is minimal. Otherwise cold air will spill into the area through the night, with early afternoon temperatures in the teens across western ND expected to dive south. Lows should be about that, lower 20s in northwest IA to the mid teens in central SD. A bit on the cold side Monday morning with wind chills in the single digits. Northwest winds will likely gust 25 to 35 mph but gradually diminish through the day. High pressure will slowly drift east Monday night into Tuesday which will result in below normal temperatures. Lows in the single digits in areas with any snow cover and teens elsewhere. Highs should rebound back into the 30s north of I-90 with upper 30s and 40s to the south. The next wave which could bring patchy light snow will move through Tuesday night into Wednesday and drag down some colder air again. Not much model agreement on the snow potential, but the main message is any snow would be light. Highs on Wednesday will be in the 20s and 30s. The colder air continues to nose south through the weekend with highs Thanksgiving Day and Friday in the 20s, then possibly the teens and lower 20s Saturday. Wind chill values below zero are likely Friday morning and Saturday morning. Will also be watching a system Saturday that could bring a band of light snow with just a small chance for a more impactful snow, but for now too far out to grab on to anything. Also the type of system that could easily slide southwest of the area with cold high pressure in place across the area. && .AVIATION /00Z TAFS THROUGH 00Z TUESDAY/... Issued at 445 PM CST Sun Nov 24 2024 MVFR and IFR ceilings will reside across the area this evening before decreasing from west to east late tonight. In addition, light snow is expected to develop across the area, with lowest visibility occurring north of Interstate 90. Any light snow is expected to depart the area after 09Z tonight. Winds will be out of the northwest through the period, gusting around 20 to 25 kts into late Monday afternoon. && .FSD WATCHES/WARNINGS/ADVISORIES... SD...None. MN...None. IA...None. NE...None. && $$ DISCUSSION...08 AVIATION...JM