SPC 0100Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0727 PM CDT Mon Oct 20 2025 Valid 210100Z - 211200Z ...NO SEVERE THUNDERSTORM AREAS FORECAST... ...SUMMARY... Thunderstorm potential will increase later tonight across the lower Mississippi Valley. Severe weather is not expected. ...01z Update... Nocturnal cooling is contributing to a stabilizing boundary layer across most of the CONUS early this evening. 00z soundings support this with only meager instability observed at UNR within a steep low-level lapse rate environment. South FL soundings continue to exhibit modest buoyancy but lightning trends are definitively down. This trend is expected to continue over the next few hours. Later tonight, elevated instability will increase across the lower MS Valley. Weak convection is expected to develop across this region along/ahead of a surging frontal zone. Forecast soundings do not appear particularly favorable for large hail and severe probabilities will not be introduced. ..Darrow.. 10/21/2025
