Area Forecast Discussion
Issued by NWS Tulsa, OK
Issued by NWS Tulsa, OK
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550 FXUS64 KTSA 192320 AFDTSA Area Forecast Discussion National Weather Service Tulsa OK 620 PM CDT Sun May 19 2024 ...New AVIATION... .SHORT TERM... (Thru Tonight) Issued at 200 PM CDT Sun May 19 2024 Storm chances, timing and severity are the main concerns tonight. A southern stream jet extends from a system well off the coast of SoCal/Baja east into the Desert Southwest. The nose of this jet has entered the southern High Plains just ahead of a PV max over northern NM. At the surface, a dryline extends south over the eastern TX Panhandle and the TX South Plains and curves northwest back toward an area of low pressure near the Raton Mesa in SE CO. A warm front extends northeast from there across central and NE KS. As lift increases with the approaching northern NM wave, storms will begin to fire on the dryline this afternoon and spread east. CAMs suggest the best coverage will be across KS, which makes sense given the track of the upper wave. A bow echo with widespread damaging wind potential is expected across KS tonight. Just to the south of this, CAMs have isolated to scattered likely severe storms down into NW OK ahead of the dryline. These storms could track into NE OK closer to the KS border this evening and overnight with a continued severe wind and hail threat, though likely weakening with time as they spread east/northeast. Time window for severe in NE OK looks to be roughly 03Z to 06Z. Storm chances will wind down toward 12Z Monday morning. Lacy && .LONG TERM... (Monday through Sunday) Issued at 200 PM CDT Sun May 19 2024 The dryline likely stays capped on Monday, so the main focus for storms will be the front across KS, and this activity should remain north of the state line thru Monday night. Focus then turns to Tuesday and Wednesday, the days which appear to have the greatest severe potential this week. The system off the coast of SoCal/Baja will be ejecting into the central Plains Tuesday afternoon and evening, optimally timed with max diurnal heating. At the surface, a cold front will be approaching from the north and a dryline will be mixing farther east closer to the I-35 corridor. Mid level temps will be warm, but the glancing influence from the upper wave should weaken the cap enough to allow for at least isolated storm development north of I-40 Tuesday afternoon. With H5 flow expected to be greater than 50kts, deep layer shear should be plenty strong for supercells. The initiation zone will be closer to our area, so any cells that develop will be maturing as they move across E OK and possibly into NW AR and will be capable of producing higher-end severe weather. Low level shear will increase by evening, increasing the tornado threat with any ongoing discrete cells. Storms will also begin to develop along the front across NE OK during the evening, though these storms will be more multicell and linear, and not as high of a severe threat as they spread southeast Tuesday night. The slowly sagging front will be the focus for more storms on Wednesday as the airmass destabilizes with daytime heating, mainly to the south and east of I-44. A severe wind/hail threat will continue with these storms as they track southeast. The front never really clears our area, meanders over the region and interacts with the next wave to produce another round of storms Wednesday night into Thursday. It is during this time when severe threat maybe wanes a bit and locally heavy rainfall and flooding threat increases. We may get a break in the action for much of Friday before storm chances increase toward next Sunday with the next system moving across the central Plains. Lacy && .AVIATION... (00Z TAFS) Issued at 620 PM CDT Sun May 19 2024 Decaying thunderstorm complex is forecast to move into portions of northeast Oklahoma in the 05-06Z time frame. Strong/gusty winds will be likely with any of the stronger storms. This activity could move into northwest Arkansas late tonight but overall coverage will likely be greatly diminished and was handled with PROB30 groups for now. Otherwise, VFR conditions are expected with southerly winds increasing during the day Monday. && .PRELIMINARY POINT TEMPS/POPS... TUL 67 90 74 88 / 50 10 0 20 FSM 69 91 70 90 / 10 10 0 0 MLC 70 90 72 86 / 10 0 0 10 BVO 65 89 70 89 / 60 20 0 20 FYV 66 88 69 89 / 10 10 0 10 BYV 66 88 69 89 / 10 10 0 10 MKO 67 89 72 88 / 30 10 0 10 MIO 66 88 71 88 / 40 20 0 20 F10 68 89 72 87 / 40 10 0 20 HHW 67 88 70 85 / 0 0 0 0 && .TSA WATCHES/WARNINGS/ADVISORIES... OK...None. AR...None. && $$ SHORT TERM...30 LONG TERM....30 AVIATION...12