SPC AC 260600 Day 2 Convective Outlook NWS Storm Prediction Center Norman OK 0100 AM CDT Sat Apr 26 2025 Valid 271200Z - 281200Z ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS ACROSS MUCH OF CENTRAL AND NORTHWEST NEBRASKA...SOUTHERN SOUTH DAKOTA...AND FAR NORTHERN KANSAS.... ...SUMMARY... Isolated severe storms are possible across the southern High Plains and central Plains Sunday afternoon/evening. Scattered severe storms are possible across the northern Plains and Upper Midwest Sunday evening/night. ...Discussion... A moderately strong mid-level jet streak will extend from the Southwest and into the Central Plains on Sunday as a mid-level trough advances eastward through the Intermountain West. As this occurs, a strong surface cyclone will develop in the central High Plains/northern Plains. This strengthening cyclone will draw richer low-level moisture into the northern Plains while a dryline sharpens across the High Plains. This dryline will extend from southwest Nebraska southward to the Texas Big Bend on Sunday afternoon. Mid to upper 60s dewpoints east of this dryline and strong heating will support moderate to strong instability by Sunday afternoon. Forecast soundings show significant inhibition along the dryline in the southern High Plains with lesser inhibition with increasing latitude. Weak height falls and a sharp dryline circulation could support isolated supercell development along the dryline from southwest Kansas southward. A favorable environment will support a conditional threat for all severe weather hazards wherever supercells can develop within this region, but coverage concerns preclude a greater categorical risk at this time. Farther north, near the surface low, storm coverage probabilities increase due to stronger forcing and weaker inhibition. At least a few supercells are likely from northern Kansas across Nebraska and perhaps into far southern South Dakota Sunday evening with a threat for large hail and severe wind gusts. Hodographs will be relatively small during the evening, but once the low-level jet intensifies after 00Z, hodographs will enlarge quite rapidly with increasing low-level shear in the 00Z to 02Z timeframe. However, storm longevity and intensity after sunset remains questionable as forecast soundings show strong inhibition across much of the open warm sector. Therefore, any supercells which develop, may mostly exist prior to the strengthening low-level shear. Therefore, only 2 percent tornado probabilities are warranted at this time despite a considerably higher conditional threat. Scattered thunderstorms capable of large hail are expected to develop late Sunday evening and into the overnight hours along and north of the warm front as isentropic ascent strengthens with the associated strengthening low-level jet. ..Bentley.. 04/26/2025 CLICK TO GET WUUS02 PTSDY2 PRODUCT NOTE: THE NEXT DAY 2 OUTLOOK IS SCHEDULED BY 1730Z