Severe Storm Outlook Narrative (AC)
Issued by NWS
Issued by NWS
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170 ACUS01 KWNS 200046 SWODY1 SPC AC 200045 Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0745 PM CDT Thu Sep 19 2024 Valid 200100Z - 201200Z ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS FROM PARTS OF THE UPPER MISSISSIPPI VALLEY INTO PARTS OF NORTHEAST OKLAHOMA... ...SUMMARY... Scattered strong to severe storms remain possible through this evening from the upper Mississippi Valley southward into northeast Oklahoma. A shortwave trough will shift northeastward out over the Dakotas and MN this evening, as an upper low moves northeastward across MB. Winds aloft will weaken over the area, though cooling aloft will continue spreading into the upper Great Lakes. At the surface, a weak front/wind shift extends from the main surface low over MB southward across MN and into IA, and from southeast KS into northwest OK. The strongest cells currently stretch from the MN Arrowhead southward into north central IA, with primarily discrete storm mode along the front. Farther south, a secondary area of storms persist over southeast KS into northeast OK. Tornado watch #678 continues over northwest WI this evening, where low-level shear is a bit stronger. Storms across this area may persist for several more hours before dissipating, as temperatures aloft are cooling. Farther south, Severe Thunderstorm watches #677 and #679 continue along the boundary, where storms remain within the diurnal instability axis. Temperatures aloft are quite warm here, and storms should dissipate sooner than points north. Until then, locally severe gusts or hail will be possible. For more information see mesoscale discussion #2089. ..Jewell.. 09/20/2024 $$