Weather Alerts For Port Byron, IL

There is a Slight Severe Storm Risk for your location. Continue reading for today's outlook from the National Weather Service's Storm Prediction Center. -------------------- National Severe Storm Outlook THERE IS AN ENHANCED RISK OF SEVERE THUNDERSTORMS FROM CENTRAL NEBRASKA INTO WESTERN IOWA SUMMARY Scattered wind damage and large hail are expected from parts of Nebraska into Iowa Friday. Isolated to scattered severe storms are also possible extending eastward from the northern/central Plains into the Midwest, Tennessee Valley, and Mid-Atlantic. Synopsis The flow across the central US will modify today, becoming more zonal as height rises begin across the southern Rockies. Upper-level ridging will continue across the eastern US. A surface front will extend across the northern High Plains into the Midwest and Upper Great Lakes. Several clusters of thunderstorms are expected to develop in the vicinity of this boundary. Additional scattered thunderstorms will be possible across portions of the Northeast to the Mid-Atlantic and across the Tennessee Valley and northern Georgia. Northern/Central Plains Modest westerly flow will remain across the northern/central Plains this afternoon, with a shortwave trough rotating through the flow across the Dakotas into Minnesota by the evening. Scattered thunderstorm activity is expected along and near a surface boundary extending from the western Dakotas into the Upper Midwest. A reservoir of moderate to strong instability will remain amid a plume of steep low to mid-level lapse rates. Initially, a few supercells are likely, particularly near the Black Hills in South Dakota and across the central Dakotas. Deep layer shear around 30-40 kts and aforementioned steep lapse rates will support potential for large to very large hail. Eventual upscale growth into one or more bowing clusters is expected towards the evening, especially as forcing for ascent increases with the shortwave and increasing low-level jet in the evening. Potential will also increase for a few significant gusts 75+ mph, particularly across northeastern Nebraska into western Iowa. Additional isolated supercell development will be possible near the surface trough and dry line from western Kansas into the Oklahoma/Texas Panhandle. Forcing will be weaker in this region, but a few instances of large hail and severe wind will be possible. Midwest to the Lower Great Lakes and portions of the Northeast/Mid Atlantic Widely scattered thunderstorm activity will be possible across the Midwest into the Great Lakes/Upper Ohio Valley in the vicinity of residual outflow from overnight activity. Deep layer shear/flow will be relatively weak but a moderately unstable and moist air mass will support potential for a few clusters which produce swaths of damaging wind. A corridor of more favorable mid-level flow around 40-50 kts will exist along the periphery of the ridge across the Northeast to the northern Mid-Atlantic. Deep layer shear around 30-40 kts may support one or more organized clusters with damaging wind potential into the afternoon/early evening. TN Valley and northern GA Widely scattered thunderstorm activity is expected across portions of the Tennessee Valley into northern Georgia this afternoon. Flow across the region will be negligible but a very moist and unstable air mass amid steep low to mid-level lapse rates will support potential for wet downbursts.