Severe Storm Outlook Narrative (AC)
Issued by NWS
Issued by NWS
122 ACUS48 KWNS 280854 SWOD48 SPC AC 280853 Day 4-8 Convective Outlook NWS Storm Prediction Center Norman OK 0353 AM CDT Tue May 28 2024 Valid 311200Z - 051200Z ...DISCUSSION... Medium-range guidance indicates that an initially prominent mid-level ridge will become increasingly suppressed across the Great Lakes region late this week into early next weekend. It appears that flow will then trend more zonal along the interior Canadian/U.S. border vicinity, but subsequent flow evolution remains uncertain due to continuing notable spread within/among the various model output. Broad mid-level ridging, within the stronger westerlies emanating from the northern mid-latitude Pacific, is generally forecast to build inland of the northern Pacific coast through the western/central Canadian U.S. border area by the middle of next week. It is possible that this may be preceded by mid-level troughing which may contribute to modest surface cyclogenesis, from the lee of the northern Rockies through the middle Missouri Valley and northern Great Plains Red River Valley by early next Monday, then across northwestern Ontario Tuesday. It might not be out of the question that increasing flow and shear, coupled with low-level moisture return ahead of a sharpening dryline across the High Plains, could contribute to an increase in severe weather potential late Sunday afternoon. This could continue along a cold front overtaking the dryline across the northern Great Plains into Upper Midwest, and along the dryline across the central and southern High Plains, into Monday/Monday night. ..Kerr.. 05/28/2024