South Dakota Plains Face Supercell Hail, Wind Surge as Watch Nears — SevereWX

Storms are stirring in the South Dakota Plains as a weak shortwave trough nudges into eastern Wyoming, sparking initial development near Chadron, Nebraska, along a stationary boundary. Cumulus clouds are bubbling up in central South Dakota too, with surface heating chipping away at lingering inhibition.

Expect wider storm coverage by late afternoon into early evening, fueled by a ramping low-level jet. Solid 40-45 kt effective shear and steep mid-level lapse rates (around 8 C/km near Rapid City, easing northward) favor supercell setups. These could dish out large hail up to 2.5 inches and severe gusts of 55-70 mph, with potential for upscale growth into a windier cluster later.

SPC's Mesoscale Discussion 1534 pegs watch odds at 80% through 5 PM CDT. Peak threats include hail 1.50-2.5 inches, winds 55-70 mph, and isolated tornadoes to 90 mph.

Track radar closely if you're in western/central SD or far northern NE. Have your severe weather plan ready—secure outdoors, shelter smart, and monitor updates from local NWS offices like Rapid City (UNR), Aberdeen (ABR), and North Platte (LBF).

Stay prepared out there.