MD 2288 CONCERNING HEAVY SNOW FOR NORTHWEST OKLAHOMA TO CENTRAL KANSAS
Mesoscale Discussion 2288 NWS Storm Prediction Center Norman OK 1258 PM CST Sat Nov 25 2023 Areas affected...Northwest Oklahoma to central Kansas Concerning...Heavy snow Valid 251858Z - 260000Z SUMMARY...The potential for periods of heavy snow (snowfall rates exceeding 1 inch/hour) will steadily increase through the afternoon and early evening hours across northwest OK and southern to central KS. DISCUSSION...Over the past hour, a few surface observations across south-central KS have reported periods of visibility reductions down to 0.25 mile, indicative of heavy snowfall rates. Such conditions are expected to become more common through the remainder of the afternoon and early evening hours. Latest water-vapor imagery shows the exit region of the 500 mb jet overspreading the TX/OK Panhandles region; concurrently, regional VWP observations have sampled strengthening flow in the 1-2 km layer - likely a mass response associated with the approaching jet. Consequently, both synoptic and mesoscale ascent (isentropic and frontogenetical lift within a warm advection regime near 850 mb) appear to be increasing over the region. Upstream radar trends support this idea with a gradually expanding swath of stratiform precipitation noted over the eastern TX Panhandle. This lift/precipitation will shift east through the afternoon and evening hours, resulting in gradual change over to primarily snow across parts of northwest OK as well as a prolonged period of moderate snowfall rates across southern KS. Strong mesoscale ascent along the 850 mb baroclinic zone, coupled with weak (< 50 J/kg MUCAPE) buoyancy, should result in periods of heavy snowfall with rates approaching 1 inch/hour. ..Moore.. 11/25/2023 ...Please see www.spc.noaa.gov for graphic product... ATTN...WFO...TOP...ICT...OUN...DDC... LAT...LON 38279599 36179817 35939855 35819888 35839930 35939963 36249984 36529987 36809976 39229712 39379682 39329640 38939575 38619580 38279599