SPC 0100Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0750 PM CDT Sat Oct 09 2021 Valid 100100Z - 101200Z ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS ACROSS A PORTION OF THE UPPER MISSISSIPPI VALLEY REGION... ...SUMMARY... The threat for mainly damaging wind and a brief tornado or two will persist this evening across the upper Mississippi Valley region. ...Upper Mississippi Valley region... A severe squall line with embedded bowing segments and mesovortices currently extends from southeast ND through far western MN. Farther downstream the atmosphere remains at least marginally unstable with latest objective analysis indicating 500-1000 J/kg MLCAPE. Forcing for ascent and favorable storm-relative inflow associated with a strengthening southeasterly low-level jet will maintain this line of storms through central and north central MN next several hours. The storms are moving through a strongly sheared environment with 40-50 kt effective bulk shear as well as large low-level hodographs with 250-350 m2/s2 0-1 km storm relative helicity. This environment will continue to promote embedded organized structures with an attendant threat for damaging wind and a brief tornado or two next several hours. Storms should gradually weaken later tonight as instability becomes increasingly marginal. ..Dial.. 10/10/2021 Read more LIVE: spc.noaa.gov
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