Rockies Thunderstorms Advance East Threatening Evening Wind Clusters — SevereWX

Thunderstorms firing along the high terrain of southeastern Wyoming and central Colorado are set to push eastward into the central High Plains this afternoon and evening, per SPC Mesoscale Discussion #1558.

A subtle mid-level disturbance and southeasterly upslope flow are boosting storm development across the central Rockies and Laramie Range. With strong westerly winds aloft, expect these storms to track east while low-level heating steepens lapse rates in a dry, mixed boundary layer.

This setup favors evaporative cooling beneath high-based storms, leading to merging cold pools and upscale growth into linear segments or clusters. The result? An escalating risk for damaging wind gusts of 65-80 mph, especially as activity matures tonight.

A moisture gradient adds complexity—dewpoints rise from the 40s-50s F near the Foothills to the low/mid 60s in western Kansas and Nebraska. Modest effective shear around 25-30 knots means organization could build gradually. SPC pegs the odds of a Severe Thunderstorm Watch at 80%, though exact timing hinges on storm evolution.

Peak threats include 1.00-1.75 inch hail and those potent gusts. Affected areas span portions of northeast Colorado, southeast Wyoming, southwest Nebraska, and northwest Kansas—check the SPC graphic for precise lat/lon blocks.

Stay prepared: Monitor radar via local NWS offices (BOU, CYS, PUB, LBF, GLD, DDC), secure outdoor items, and have a severe weather plan ready. Act quickly if warnings issue.