Plains Heat Wave Ignites 100 MPH Wind Threats in SD and MT — SevereWX

Plains Heat Wave Ignites 100 MPH Wind Threats in SD and MT

Intense thunderstorms are firing up across the Plains this afternoon, with the most extreme wind potential locked in for south-central and southeast South Dakota. Temperatures soaring to 105-110°F have supercharged the atmosphere, packing in massive instability (near 2000 J/kg MLCAPE). Storms are bubbling along a cirrus edge tied to a subtle upper-level disturbance, poised to merge into a powerful mesoscale convective system (MCS). Expect outflow-dominant storms producing gusts of 80-100 mph—possibly warranting a Particularly Dangerous Situation (PDS) watch.

Transitioning eastward and northward, central Montana is next in line as heating erodes lingering low-level inhibition. Early cumulus fields in southwest Montana are hinting at broader storm coverage spreading into hotter, deeply mixed air over the next 2-3 hours. With decent mid-level winds (30-35 knots), loosely organized clusters could whip up 65-80 mph gusts, especially away from terrain outflows.

Both areas share a common thread: extreme heat fueling wind-focused severe weather in unstable, steep-lapse-rate environments. The Storm Prediction Center (SPC) has issued Mesoscale Discussions (MDs)—heads-up bulletins for the public signaling focused severe risks on the meso (small) scale. MDs often precede watches, urging folks to monitor closely as conditions evolve rapidly.

Stay prepared: Check radar frequently, secure outdoor items, avoid flooded roads, and have a severe weather plan ready. Watches could drop soon—95% odds for South Dakota, 60% for Montana. Follow SPC.noaa.gov and local NWS for updates.

(Issued: Jul 25, 2026 | MD 1729/1730)