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Area Forecast Discussion
Issued by NWS Aberdeen, SD
Issued by NWS Aberdeen, SD
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892 FXUS63 KABR 020530 AAC AFDABR Area Forecast Discussion...UPDATED National Weather Service Aberdeen SD 1230 AM CDT Tue Jul 2 2024 .KEY MESSAGES... - The active weather pattern of showers and thunderstorms persists through the workweek. && .UPDATE... Issued at 1228 AM CDT Tue Jul 2 2024 See updated aviation discussion below. UPDATE Issued at 936 PM CDT Mon Jul 1 2024 Updated POPs to clear out the western edge more quickly. The HRRR seems to have a fairly good handle on precip trends over the next few hours. No severe weather is expected tonight. && .SHORT TERM /THIS EVENING THROUGH TUESDAY NIGHT/... Issued at 201 PM CDT Mon Jul 1 2024 Daytime heating and elevated lapse rates over western SD will assist in the rapid development of thunderstorms in the next 2-3 hours. We will be monitoring these storms as they near or develop across our central SD counties around or shortly after 21Z. Initial storms will be capable of producing large hail around 2 inches in diameter, strong winds over 60 mph. We won`t be able to rule out a tornado or 2 with these initial storms over our area. Forecast solutions have come into better agreement on the timing of storms between 5-9pm over central SD and the James River Valley from 8-10pm, before shifting to far eastern SD and west central MN 10pm-midnight. Significant low level clouds across the James River Valley and east should act to weaken incoming storms, despite the significant low level moisture and strong winds. Other than lingering light showers over our far eastern counties after midnight, dry weather should then be the rule for much of the forecast area through the rest of the forecast period. The exception will be our far southwest counties. We`ll be monitoring the latest trends, as some CAMS are pin pointing the potential for a few showers or weak thunderstorms during the afternoon and evening hours. && .LONG TERM /WEDNESDAY THROUGH MONDAY/... Issued at 201 PM CDT Mon Jul 1 2024 Our temperature forecast is currently running in the 20-40th percentile (on the low side) Wednesday through Thursday. While the 25-75th percentiles are generally within about 5 degrees, be aware that there is room for change and more likely to higher readings for that period. Dry weather will continue through Wednesday morning. There is a Marginal Risk (level 1 of 5) of severe weather Wednesday over our counties west of the Missouri River. Dewpoints will be on the increase again Wednesday late Wednesday afternoon/evening, getting back into the low 60s. A band of higher CAPE values over 1000 J/kg looks to move into at least our southwestern counties by around 21Z as a trough shifts across western SD. The main surface low over eastern CO will push southeast across western KS/OK Thursday morning. The unsettled (at least a 30 percent chance of precipitation every 6 hours) will continue through Thursday evening, with more afternoon and evening shower and thunderstorm anticipated through the upcoming weekend. The 500mb trough currently over the west coast will shift across the Northern Plains on Tuesday, and be reinforced Thursday with a low sinking overhead before shifting across MN late Thursday night into Friday. While a brief ridge may shift in Friday night, an overall trough type of pattern will quickly return for the rest of the forecast period. && .AVIATION /06Z TAFS THROUGH 06Z TUESDAY/... Issued at 1228 AM CDT Tue Jul 2 2024 Terminals KABR,KATY,KPIR,KMBG IFR cigs across the east will clear from west to east overnight as a trough exits the region, leaving VFR conditions. A few more showers and thunderstorms may move south of Pierre tonight, but most of the region is expected to remain dry overnight and through the day Tuesday. && .ABR WATCHES/WARNINGS/ADVISORIES... SD...None. MN...None. && $$ UPDATE...Wise SHORT TERM...KF LONG TERM...KF AVIATION...Parkin