Area Forecast Discussion
Issued by NWS Tulsa, OK
Issued by NWS Tulsa, OK
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187 FXUS64 KTSA 132016 AFDTSA Area Forecast Discussion National Weather Service Tulsa OK 316 PM CDT Mon May 13 2024 ...New SHORT TERM, LONG TERM... .SHORT TERM... (Through tonight ) Issued at 316 PM CDT Mon May 13 2024 A mid/upper level low pressure was positioned over Eastern Kansas as of mid afternoon with scattered showers and storms rotating around the wave. At the same time a surface low was also located over far Eastern Kansas with a trailing surface boundary extending into Oklahoma along a line from near Miami to Okemah and back into South Central Oklahoma. Along and east of this boundary additional showers/storms were developing into a slightly more favorable instability environment with surface CAPE in excess of 1500 J/kg. Behind the surface boundary...additional development was also taking place along an elevated band of frontogenetic forcing between 925-mb to 700-mb. Both surface and elevated instability were slightly weaker in this area...though was aided by the vort max associated with the mid/upper low. Into this evening...showers/storms are forecast to continue to develop into a broken line along and east of the surface boundary and push eastward through Southeast Oklahoma and Northwest Arkansas. Surface/elevated instability out ahead of the boundary should remain maximized through sunset and then begin to weaken through the evening hours. In response...a limited to locally elevated severe potential is capable within this thunderstorm activity. Large hail and locally strong wind gusts are the primary threats. A very low tornado threat cannot be ruled out as well into this evening with directional shear in place and the vort max moving into the CWA. At this time...the tornado potential was mainly over far Eastern Oklahoma and also Northwest Arkansas. Majority of the storm development is progged to exit the CWA after 03z this evening Behind the surface boundary...more scattered shower/storm potential will continue along/near the elevated frontogenetic forcing band and the mid/upper trof moving into the CWA. Limited severe potentials exist within this area of storm development as well with large hail and gusty/strong winds the main threat. Most of this activity is expected to be exiting the CWA by 06z. Overnight tonight...the mid/upper trof axis moves across the CWA and should be exiting early Tuesday morning. Between 06-12z...there is an isolated shower potential with precip trying to wrap back around the low. Cloud cover tonight along with the potential for some patchy areas of fog should keep low temps in the 50s for most locations. && .LONG TERM... (Tomorrow through Monday) Issued at 316 PM CDT Mon May 13 2024 Tuesday morning the mid/upper low is forecast to be positioned over Western/Central Missouri with the trof axis having exited the CWA. This wave will continue to move off to the east with the backside of the departing low exiting by Tuesday evening. Low end chances for additional showers/storms remain forecast over mainly far Northeast Oklahoma and also Northwest Arkansas during the day. Severe potentials remain quite low on the backside of the low. Once the precip exits and the low moves farther away...rising heights are expected Tuesday night with clearing conditions and light winds become more east/southeast. These conditions could potentially allow for areas of fog development once again over parts of Northwest Arkansas. Back over Northeast Oklahoma...additional cloud cover is forecast to move in late Tuesday night/Wednesday morning as a mid level impulse approaches from the west. There is a slight chance of showers/storms moving into Northeast Oklahoma as this impulse pushes through. Underneath this cloud cover...temps look to warm into the 70s/low 80s while mid 80s are forecast along/south of Interstate 40. Storm chances increase Wednesday night into Thursday for the CWA in response to a lead wave ejecting out of the Desert Southwest ahead of the parent upper low. The greater storm chances are currently forecast over Northeast Oklahoma underneath the lead wave. Storm chances continue Thursday into Friday with the parent upper low progged to move out and across the Southern/Central Plains. There still remains some uncertainty among the extended model solutions with the timing/progression of this wave. However...there is slightly more agreement than 24-hrs ago. For this forecast...the upper low is forecast to exit Friday night with the backside of the wave departing Saturday morning. Thus...will hold onto PoPs into Saturday morning before tapering them off from west to east. Temperatures in the 70s/low 80s are forecast late week and then look to warm into the mid 80s over the weekend behind the exiting precip chances. && .AVIATION... (18Z TAFS) Issued at 1217 PM CDT Mon May 13 2024 The overall trend to start the forecast will be for current MVFR ceilings to become low-end VFR (035-045 kft). Showers and thunderstorms should re-develop early in the forecast period over much of the area, with western AR sites and possibly KMLC more likely to see a direct impact from storms. Once storms move out this evening, a period of VFR conditions will prevail. However, MVFR ceilings will return to western AR late tonight, and potentially back-building into parts of NE OK early Tuesday morning. && .PRELIMINARY POINT TEMPS/POPS... TUL 58 79 57 82 / 20 0 0 10 FSM 60 77 57 85 / 40 10 0 10 MLC 57 80 56 86 / 20 0 0 10 BVO 55 78 54 81 / 40 0 0 20 FYV 57 71 53 82 / 40 30 0 10 BYV 57 71 54 80 / 50 40 0 10 MKO 58 78 56 84 / 20 0 0 10 MIO 57 74 54 79 / 30 30 0 20 F10 56 79 56 84 / 20 0 0 10 HHW 59 81 57 86 / 30 0 0 0 && .TSA WATCHES/WARNINGS/ADVISORIES... OK...None. AR...None. && $$ SHORT TERM...20 LONG TERM....20 AVIATION...14