Mesoscale Discussion 1820 NWS Storm Prediction Center Norman OK 0204 PM CDT Sun Oct 10 2021 Areas affected...Parts of southwestern through north central Oklahoma and adjacent portions of northwest Texas and south central Kansas Concerning...Severe potential...Watch likely Valid 101904Z - 102100Z Probability of Watch Issuance...80 percent SUMMARY...Increasingly widespread and intensifying thunderstorm development appears probable in a corridor across southwestern through north central Oklahoma, including the Greater Oklahoma City area, as well as adjacent portions of northwest Texas and south central Kansas, by 5-7 PM. Some of this activity will pose a risk for severe hail initially, with increasing potential for a few tornadoes by early evening. DISCUSSION...A weak surface cold front has stalled south of Wichita, KS, south-southwestward into areas near/east of Childress, TX, where a surface low is beginning to form near the nose of a corridor of stronger boundary-layer heating and deeper mixing, beneath a plume of capping elevated mixed-layer air across the southern Great Plains. A dryline is becoming better defined east and south of the surface low, and boundary-layer moisture is gradually increasing along and ahead of the front to the northeast of the surface low. Due to the initially modest moisture relatively to the warmth of the elevated mixed-layer, latest objective analysis indicates that warm sector boundary-layer CAPE remains fairly weak (500-1000 J/kg). However, it appears that this will begin to substantively change during the next few hours, as the leading edge of mid-level forcing for ascent and cooling now overspreading the Texas Panhandle/South Plains progresses eastward. Weakening inhibition and increasing mixed-layer CAPE likely will coincide with strengthening deep-layer shear accompanying a 50-70+ kt southwesterly 500 mb jet streak, contributing to an environment conducive to organized severe thunderstorm development. It seems probable that this will include a rapidly upscale growing line of storms along/ahead of the front by early evening. However, initial storm development may include isolated to scattered discrete supercells, particularly in a possible cluster near/northeast of the surface low and dryline across southwestern Oklahoma. South-southwesterly flow in the 850-700 mb layer is initially rather modest, but forecast to strengthen to 30-40+ in the vicinity of the intensifying convective development, generally along the Interstate 44 and 35 corridors (near and southwest through north of the Oklahoma City metropolitan area) by around 00-01Z. This will contribute to enlarging low-level hodographs supportive of strengthening low-level mesocyclones, posing a risk for tornadoes, in addition to severe hail. ..Kerr/Hart.. 10/10/2021 ...Please see www.spc.noaa.gov for graphic product... ATTN...WFO...TSA...ICT...OUN...LUB... LAT...LON 35069977 35839849 37299712 36439647 34669803 33959908 34490009 35069977
Storm Prediction Center Mesoscale Discussion 1820
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