Area Forecast Discussion
Issued by NWS Tulsa, OK
Issued by NWS Tulsa, OK
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204 FXUS64 KTSA 210527 AFDTSA Area Forecast Discussion National Weather Service Tulsa OK 1227 AM CDT Tue May 21 2024 ...New AVIATION... .UPDATE... Issued at 938 PM CDT Mon May 20 2024 Current forecast on track this evening with no significant shortly term changes anticipated. && .SHORT TERM... (The rest of this afternoon ) Issued at 133 PM CDT Mon May 20 2024 Warm, humid, but otherwise quiet weather is in store for the remainder of today and tonight. There will be plenty of potential instability, but a capping inversion should keep convection from initiating. High temperatures will peak this afternoon in the 80s to low 90s, decreasing to the upper 60s to low 70s overnight. A breezy southerly wind will be present for much of the short term period. && .LONG TERM... (Tonight through Monday) Issued at 133 PM CDT Mon May 20 2024 A shortwave trough will pass to the north of the area on Tuesday with good height falls, implying broad lift over the area. Additionally, a strong upper level jet will be positioned to allow for good mid to upper level divergence across the area. Lower down, decent convergence along a surface boundary will further aid in promoting lift. Strong wind shear will be present, focusing in the mid levels. These factors will come into play with a very warm and unstable atmosphere, with 3000-4000 J of MLCAPE and PWAT values approaching 1.5". These values are climatologically unusual with the EPS EFI for CAPE-Shear showing values of 0.7 to 0.8. Most of the moisture will be concentrated in the lower levels, with the specific humidity in the surface to 850 hPa layer near the 99th percentile for this time of year. Thunderstorms are expected to develop along the cold front during the late afternoon or evening. However, CAMs are uncertain with respect to where and when these storms will be able to get going, which mostly stems back to differences in how quickly the capping inversion is broken. Wherever storms do develop, they will certainly have the potential to become severe. With that in mind, storms will likely initiate in northeast OK in the late afternoon or early evening, initially as discrete or semi-discrete cells. Storms will then congeal and move into east-central OK and northwest AR in the late evening and overnight hours. Discrete storms will have the potential for all severe hazards, including hail, wind, tornadoes, and heavy rain. As storms grow upscale, the threat for hail will diminish and wind will increase. There is some question of convective coverage, with most models not showing storms everywhere. Accordingly, kept Pops mostly in the 50-70% range for northeast OK and northwest AR, with somewhat lower Pops to the south. The cold front driving Tuesday`s storms will sag south, settling across southeast OK or perhaps northern Texas on Wednesday. Temperatures will be much cooler north of this boundary, with highs in the low to mid 70s for many locations. Showers and thunderstorms will continue to focus along the boundary, but guidance shows the potential for elevated storms to develop well to the north, even into northeast OK and northwest AR. Model soundings show MUCAPE in excess of 2000 J/Kg, so severe hail would be possible with any storms. Closer to the boundary across southeast OK, locally heavy rainfall will promote a flash flood potential for some areas. The cold front lifts back north on Thursday, now as a warm front, with climatologically unusual instability, wind shear, and low level moisture. Model guidance again produces widespread showers and thunderstorms, with the strongest signal across southeast OK into west-central AR. A few severe storms will remain possible considering the strong instability and sufficient flow for supercell development, but at this lead time it`s difficult to pin down details. The same general pattern will persist through Sunday with additional storm chances and daily severe weather probabilities. The exact details will become more clear as we get closer. Southwest USA ridging may finally build in early next week leading to a warming trend, though if typical MCS activity develops, temperatures would be slower to warm than models are currently indicating. && .AVIATION... (06Z TAFS) Issued at 1222 AM CDT Tue May 21 2024 VFR conditions will prevail most of the period, with exception of lower ceilings surging north out of Texas early this morning, which will likely bring a period of MVFR conditions to KMLC. Gusty south winds will increase this morning in advance of a cold front, which will move into part of northeast OK late this afternoon. Scattered thunderstorms, some strong to severe, are probable along the front by 00z, but uncertainty remains high with coverage. For the time being, will maintain a PROB30 at all NE OK and NW AR sites from 00-06z. && .PRELIMINARY POINT TEMPS/POPS... TUL 62 74 62 79 / 60 60 50 60 FSM 72 82 67 81 / 50 80 80 70 MLC 71 81 64 80 / 40 80 80 70 BVO 59 73 56 79 / 60 50 40 50 FYV 66 79 61 79 / 70 80 80 70 BYV 65 77 62 78 / 60 80 80 70 MKO 67 77 63 77 / 60 80 70 70 MIO 60 72 59 78 / 80 70 50 50 F10 67 76 62 78 / 50 70 70 70 HHW 74 84 67 80 / 20 70 70 70 && .TSA WATCHES/WARNINGS/ADVISORIES... OK...None. AR...None. && $$ SHORT TERM...06 LONG TERM....06 AVIATION...14