Severe Storm Risk - Lansing Valley Mobile City, IA

There is a Marginal 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 A SLIGHT RISK OF SEVERE THUNDERSTORMS ACROSS PORTION OF THE MIDWEST INTO PA AND NORTHERN MD/VA...AND ACROSS PARTS OF THE NORTHERN PLAINS SUMMARY Thunderstorms with severe wind gusts will be possible this afternoon and evening from northern Illinois eastward into Pennsylvania. Severe gusts and hail will also be possible from parts of the central and northern Plains into the Midwest, with scattered strong storms over southern Arizona. Synopsis A belt of enhanced west/northwesterly flow aloft will overspread the northern Plains to the Midwest and southern New England today/tonight. Only modest height falls are forecast at best. However, several convectively enhanced vorticity maxima are forecast to migrate through this upper flow regime, focusing several areas of severe storm potential today into tonight from the northern Plains to the upper Ohio Valley and parts of the Mid-Atlantic. IL to the Mid-Atlantic Early day thunderstorms may move across parts of the Midwest this morning, but should generally be sub-severe. By midday, convection could intensify within a couple of corridors. The first being the upper Ohio Valley/PA/western NY. Thunderstorm clusters will pose a risk for damaging winds and hail within a moderately unstable airmass as convection spreads east toward the Mid-Atlantic. Additional thunderstorm development is expected later in the afternoon associated with another shortwave impulse spreading east from IL into IN/OH. This activity will develop within strong instability and rich boundary layer moisture. Modestly steep midlevel lapse rates and effective shear greater than 40 kt will support initial supercells. With time, sufficient clustering is expected and bowing segments will be possible. Damaging wind and hail will be the primary hazards, though a tornado or two also could occur. Dakotas into Iowa Southeasterly low-level flow will transport mid/upper 60s dewpoints north and west across SD, with 70s dewpoints common with southeast extent across NE/IA/southern MN. This will support a corridor of strong to extreme instability across the region. While coverage remains uncertain, most guidance develops at least isolated thunderstorms by evening. Elongated hodographs amid favorable deep shear will support supercells and bows capable of large hail and damaging winds. With time, it is possible sufficient clustering occurs and upscale growth into a bowing MCS is possible as a low-level jet develops overnight. If this occurs, a swath of damaging winds is possible across parts of SD into northwest IA, oriented along the stronger instability gradient. NE/CO/KS Scattered thunderstorms are expected to develop near a surface trough across western NE/northeast CO by late afternoon/early evening. This activity will spread east/southeast. Steep low-level lapse rates will support strong outflow gusts and perhaps hail with this activity. AZ Mid/upper easterly flow will persist today amid plentiful moisture and strong heating. This will support thunderstorm development once again across higher terrain. As storms propagate westward off the higher terrain, isolated severe gusts will be possible.