kcrg weather is focused on a two-part severe setup in Iowa: a Thursday afternoon-to-evening storm window following widespread chilly rain, then another round of potentially stronger storms expected Friday.
What Happens When kcrg weather tracks two separate storm systems back-to-back?
In eastern Iowa, a “First Alert Day” has been declared for today and tomorrow due to the potential for two separate rounds of strong to severe storms arriving from two different storm systems. The first round is developing by mid-afternoon, with a window for storm activity into the afternoon and evening hours.
Before that window opens, widespread, chilly rainfall is likely, lasting into at least the early afternoon, along with a persistent stiff easterly wind. A break after the first round is expected to help temperatures surge into the 60s to near 70 degrees near and south of a warm front later in the day, with dew points climbing there as well. That warm, humid corridor near and south of the warm front is also where the risk for severe storms is expected to be highest; north of the warm front, clouds and chilly conditions should keep the severe risk substantially lower.
Timing remains a central factor. An arc of scattered storms is expected to move through between about 2: 00 p. m. in the west and around 8: 00 p. m. in the east at the latest, with the period most favorable for intense storms in eastern Iowa centered around 4: 00 to 6: 00 p. m. Storms are also expected to be fast-moving, with forward speeds of at least 50 to 60 mph, a combination that can shorten the time people have to react once warnings are issued.
What If Thursday’s storms bring hail, damaging winds, and a lower tornado chance?
Across the state, multiple rounds of thunderstorms are moving through Iowa Thursday afternoon, with another round expected Friday. Central Iowa saw steady rain earlier that brought more than an inch of rainfall, keeping temperatures cool. As warmer air pushes into southern Iowa, additional thunderstorms may develop that are capable of at least some severe weather.
The main threats highlighted for Thursday include large hail and damaging winds, with a low chance for tornadoes. The tornado risk is described as higher in southeastern Iowa, where temperatures have longer to warm up before storms arrive. Storm evolution is expected to change as activity interacts with warmer and more humid air south of I-80, where storms could intensify as they track east.
For central Iowa, storms developing in southwest Iowa early in the afternoon are expected to push eastward quickly. A corridor near the I-35 area is expected to see storms reach it between 1: 00 and 2: 00 p. m., though storms may not be severe immediately on arrival and could strengthen as they continue east. By around 5: 00 p. m., the line of storms is expected to be moving out of central Iowa, with severe risk shifting into eastern Iowa for a couple more hours before cooler, quieter weather takes over for most of the evening and overnight.
On the preparedness front, the U. S. Department of Homeland Security has emphasized checking mobile phone settings to ensure alerts are enabled, including options labeled “Government Alerts” or “Emergency Alert Messages. ” In addition, the guidance for tornado warnings remains focused on immediate sheltering: move indoors, get to the lowest floor away from windows, and put as many walls between you and the outside as possible. A basement is preferred when available, and covering the head and neck is advised. For people in mobile homes, the guidance is to move to more substantial shelter. A NOAA Weather Radio is also highlighted as a tool to receive warnings, particularly overnight.
What Happens When Friday brings a higher severe potential after a dry start?
Friday’s setup is expected to differ from Thursday’s. Another low-pressure system is forecast to draw warm, humid air toward Iowa Friday afternoon, and storms are expected to form later in the afternoon in southern Iowa and northern Missouri. The severe potential is described as higher Friday due to more energy in the atmosphere and more favorable winds, with the highest threat across southern and southeast Iowa as storms spread into the evening.
In eastern Iowa, the second potential round of strong to severe storms Friday is expected without the same prelude of widespread rain during the day. After a dry night, conditions are expected to stay dry until about mid-afternoon Friday. Temperatures are expected to vary across the region, with 40s in the far north and 70s in the far south, separated by a warm front that is expected to be critical in determining where the strongest storms develop later in the day. Near and south of that boundary, unstable air is expected to be in place alongside other ingredients favorable for severe weather.
For readers, the practical takeaway is that Thursday’s storm window and Friday’s renewed risk are being shaped by the position of the warm front and the return of warm, humid air. With storms expected to be fast-moving at times, the most important step is ensuring warnings can reach you quickly and that you have a plan to get to shelter immediately when alerts are issued.
