Severe Storm Outlook Narrative (AC)
Issued by NWS
Issued by NWS
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357 ACUS01 KWNS 080542 SWODY1 SPC AC 080540 Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 1240 AM CDT Sat Jun 08 2024 Valid 081200Z - 091200Z ...THERE IS AN ENHANCED RISK OF SEVERE THUNDERSTORMS ACROSS THE CENTRAL HIGH PLAINS... ...SUMMARY... Scattered severe thunderstorms are expected to develop across the central High Plains this afternoon then spread toward south-central Kansas during the evening. Isolated severe storms may also occur across the Ozarks vicinity. ...Central Plains... Early this morning, water-vapor imagery depicts a notable short-wave trough over northern UT/western WY. This feature is forecast to advance into southeast WY/northern CO by 18z, then shift into KS during the latter half of the period. Latest model guidance suggests the primary synoptic boundary located over the Plains will drape itself near the I70 corridor early, arcing from northern KS into northeast CO. This wind shift should serve as the focus for a corridor of severe, and the boundary should gradually sag south toward the KS/OK border by the end of the period. While boundary-layer heating will prove instrumental in robust convection today, the approaching short-wave trough is expected to encourage significant organization along with early-afternoon initiation near the Front Range of southeast WY and northern CO. Forecast soundings suggest thunderstorms may develop as early as 18-19z near LAR/CYS. This activity should spread/develop southeast into eastern CO where boundary-layer heating and moist upslope flow should encourage upscale growth. Initial storm mode should be supercellular with strong surface-6km bulk shear and favorable low-level turning. NAM PFC for LIC at 09/00z exhibits MLCAPE on the order of 2500 J/kg and this should be typical across eastern CO into portions of western KS south of the front. Thermodynamic profiles favor hail in excess of 2 inches with early-mode supercells; however, severe wind threat will become more common if one or more MCSs evolve, as seem plausible given the supporting short wave. These complexes should spread across western KS toward south-central KS during the late evening hours. ...Ozarks Region... Slow-moving MCS is currently spreading across northeast KS into northern MO. This activity is forecast to advance across central MO early in the period before spreading downstream and weakening. While weak short-wave ridging will be noted in the wake of this convection, if the convective outflow is appreciable, there is some concern this boundary may drape itself across southern MO which could serve as the focus for isolated severe storms later in the afternoon. Forecast soundings exhibit strong buoyancy and modest deep-layer shear. This region may need a SLGT Risk if/when it becomes more clear a boundary will likely serve as the focus for storm initiation. ..Darrow/Weinman.. 06/08/2024 $$