Area Forecast Discussion
Issued by NWS Aberdeen, SD
Issued by NWS Aberdeen, SD
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262 FXUS63 KABR 140526 AAC AFDABR Area Forecast Discussion...UPDATED National Weather Service Aberdeen SD 1226 AM CDT Tue May 14 2024 .KEY MESSAGES... - Elevated smokes lingers ahead of the next system Tuesday. - Precipitation chances develop early Tuesday out west and increase through the day, lingering through Tuesday night before departing Wednesday. Precipitation chances range between 40-70% - Precipitation returns Thursday afternoon and evening (15-30% chance). - Temperatures to remain seasonal for next several days. && .UPDATE... Issued at 1224 AM CDT Tue May 14 2024 See updated aviation discussion below. UPDATE Issued at 610 PM CDT Mon May 13 2024 The forecast remains on track this evening. No major changes are planned. && .SHORT TERM /THIS EVENING THROUGH TUESDAY NIGHT/... Issued at 309 PM CDT Mon May 13 2024 High pressure remains in charge tonight into Tuesday. HRRR/RAP smoke models shows some lingering low concentrations across the area prior to the arrival of the next system. Tuesday should feature some warming before precipitation moves in. Timing varies a little between CAMS, however generally should see scattered showers coming into the far west a few hours after midnight, expanding east while weakening, with a more concentrated area of weak convection more towards mid day Tuesday, and slowly progressing east through the course of the day into Tuesday night. As for moisture, with it being convective season there will naturally be a wide spread in amounts, however generally speaking ensemble CAMS run an average of between a few hundreds in eastern SD/western MN to about a half inch in central SD. 25th/75th percentiles reflect the aforementioned variability with 1 to 2 tenths on the low end to 3/4 of an inch at the high range across the Missouri valley. Severe weather remains unlikely with skinny CAPE and generally stable profiles in BUFKIT. Mean CAPE only runs between 100-200j/kg during peak heating Tuesday. && .LONG TERM /WEDNESDAY THROUGH MONDAY/... Issued at 309 PM CDT Mon May 13 2024 An unsettled weather patten will continue for the long term as Clusters agree on the overall placement of the shortwave that will be over the Northern Plains, with the axis from northern SD through central SD at 12Z Wednesday. Minor differences exists on the intensity as Cluster 2 (77% GEFS/6% EC) and Cluster 3 (32% EC/10% GEFS) indicates a deeper shortwave than Clusters 1/4. Ensembles indicate the 850mb elongated low centered over the Dakotas with GEPS being the outlier as it keeps this low more north into ND/Canada. The 850mb/surface cold front is forecasted to be draped southward over central SD early Wednesday morning as northwest flow is indicated behind it. By Wednesday evening, the entire CWA will be behind the cold front/CAA as this low (with ENS/GEPS having this become an open wave) is well off to our east and northeast. Another shortwave swings down from the northwest Thursday morning as a broad 850mb low forms over central Canada and hangs out over the Northern Plains/Canadian border into Friday. Clusters really diverge at this point into the weekend with the exact placement and intensity of this low and its frontal features as it will slowly push eastward through the weekend. So low confidence exists on exact setup this far out. Ensembles indicate ongoing rain showers, mainly over our central and eastern CWA Wednesday morning as we start to see dry air move in over the western CWA from a high. NBM Pops from 12Z Wednesday-00Z Thursday range from 20-70% highest from the James River Valley and eastward, near the low, with precip tapering off west to east through the evening. By Wednesday night into early Thursday we will see a period of brief dry weather with the high pressure system before rain chances return Thursday afternoon through Friday (20-30% pops). Pops of 15-30% continue into the weekend. Closer to time we will have a better understanding when models start to come together so pops remain pretty broad due to the model variability. WPC Plumes for QPF, ending at 00Z Thursday for KABR, show a mean of around 0.33". Similar QPF totals, give or take a few hundredths, are noted for KPIR/KATY, and around 0.41" for KMBG. GEFS Plumes for QPF are similar. Latest NBM QPF follows this and generally shows QPF for Tuesday and Wednesday at or below 0.50", with the highest around the Missouri River. Prob of CAPE>500 j/kg and shear>30kts for Thursday is low at 5-10%. So organized severe threat is low, however, we could be dealing with high shear low CAPE thunderstorms Thursday afternoon into the night. Cooler temps for Wednesday behind the front with highs in the mid 60s to around 70. Gradual warming back into the 70s for the end of the week into Saturday with a cooldown again for Sunday. && .AVIATION /06Z TAFS THROUGH 06Z TUESDAY/... Issued at 1224 AM CDT Tue May 14 2024 Terminals KABR,KATY,KPIR,KMBG VFR conditions are expected at all TAF sites through the period, except in the vicinity of potential thunderstorms. Showers and thunderstorms will slowly move west to east across the region this afternoon and tonight. && .ABR WATCHES/WARNINGS/ADVISORIES... SD...None. MN...None. && $$ UPDATE...Wise SHORT TERM...Connelly LONG TERM...MMM AVIATION...Parkin