Area Forecast Discussion
Issued by NWS Topeka, KS
Issued by NWS Topeka, KS
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854 FXUS63 KTOP 280536 AFDTOP Area Forecast Discussion National Weather Service Topeka KS 1236 AM CDT Sun Apr 28 2024 .KEY MESSAGES... - Thunderstorms continue through the overnight hours. Heavy rain and lightning are the main hazards of concern tonight. - A few strong storms could develop again Sunday in eastern KS as a front continues to move through the area. - Active pattern continues through next week with several more chances for showers and thunderstorms. && .DISCUSSION... Issued at 412 PM CDT Sat Apr 27 2024 Mid-level trough has been moving through the Four Corners region throughout the day. Associated sfc warm front has been slowly pushing north across the forecast area, and is near the KS/NE border as of 20Z. The dryline appears to be well southwest of the area, although this has been obscured by the ongoing convection in northern OK and south central KS moving northward into east central KS. Our initial round of storms early this afternoon developed along the warm front, and a wake low developed in southwest portions of the area helping to push the boundary north. The outflow from this initial activity has led to a substantial decrease in instability across most of the area, with the exception of our far eastern counties where there is still upwards of 3000 J/kg of CAPE. Any additional severe storms at this point would need to be able to move into those areas out of the cluster of storms coming from OK. The CAMs are still suggesting repeated rounds of storms with heavy rainfall to move through much of eastern KS this evening and overnight, with another batch developing toward central KS towards 06-07Z. It is also around this time that Pwat approaches or exceeds 1.5", especially in east central KS. Decided to add Geary, Riley, and Marshall Counties to the Flood Watch factoring in the initial round of storms today plus recent trends in the CAMs, suggesting those areas could see more locally heavy rain through the overnight hours. Still have highest confidence in east central locations, however. Heading into Sunday, the upper low is still progged to be in NE/SD with the sfc low progressing northeastward through KS/NE. While parameters don`t look nearly as high as they did for today, instability and shear would again be supportive for severe weather for any storms that develop in eastern KS ahead of the cold front. Will need to also monitor how well the atmosphere is able to recover following the overnight convection after it moves out, but forecast soundings at TOP currently suggest capping should erode by 18-19Z. Any storms that develop should move out of the area through the evening. Monday looks to be the one dry day in the upcoming week before an active pattern commences once again. Broad upper troughing is progged to develop across much of the northwestern CONUS and deepen over the western US by mid-week. Multiple perturbations within that flow aloft lead to chances for showers and thunderstorms Tuesday onward during the work week. Timing and placement of any of these storms are uncertain this far out. && .AVIATION /06Z TAFS THROUGH 06Z MONDAY/... Issued at 1233 AM CDT Sun Apr 28 2024 Rain and embedded thunderstorms will impact sites for much of the night. Ceilings could fluctuate with storms around, but think MVFR conditions will settle in after 11Z. Some IFR CIGS could also occur for a few hours Sunday morning as rain tapers off briefly, before VFR returns midday. Additional thunderstorm development will be possible, especially at KTOP & KFOE during the afternoon Sunday. A few storms could be strong to severe. && .TOP WATCHES/WARNINGS/ADVISORIES... Flood Watch until 10 AM CDT this morning for KSZ010-KSZ011- KSZ012-KSZ022-KSZ023-KSZ024-KSZ026-KSZ036-KSZ037-KSZ038-KSZ039- KSZ040-KSZ054-KSZ055-KSZ056-KSZ058-KSZ059. && $$ DISCUSSION...Picha AVIATION...Teefey