Severe Weather (Aug. 22)

7:30 PM Update: Thunderstorms continued to develop across south-central Iowa late this afternoon and have now moved into eastern Iowa this evening. Another round of thunderstorms is now entering the state from Nebraska, showers more notable north of I80 while thunderstorms dominate south of the interstate. Expect those storms and showers to continue off to the east/northeast this evening and into tonight. It does not look like the severe threat is of much concern anymore as continued rainfall and cloud cover has limited its' potential. A stray severe thunderstorm could still be possible over southern Iowa before midnight, but the main threat with thunderstorms should once again be heavy rains & flooding potential.

3:25 PM Update: Severe Thunderstorm Watch #637 has been issued for areas of northern Kansas, central/eastern Nebraska and southwest Iowa. Thunderstorms are expected in increase in coverage & intensity over KS/NE along boundaries this afternoon/evening. These storms should move eastward with several other lines/clusters of thunderstorms and move into the remainder of NE/IA by this evening. Isolated large hail is the main threat with these thunderstorms, although some damaging winds may also occur.

3:00 PM Update: Scattered showers and thunderstorms have continued across much of northern Iowa this afternoon and are still working their way through northeastern Iowa currently. Additional thunderstorm development has occurred south of the previous convection, much of southwest and southcentral Iowa are seeing these scattered storms develop. Currently only one of those storms has been able to reach severe limits, capable of marginally severe hail, over Fremont & Mills counties. Other storms may be able to reach severe limits for a short period of time this afternoon, with the main threat being marginally severe hail. The SPC has issued a Mesoscale Discussion for this reason, mentioning that a severe thunderstorm watch is possible.

10:30 AM Update: Once again the state is under the 'slight' risk for severe weather today, already thunderstorms are continuing to fire along a stationary boundary over northwest Iowa. These thunderstorms continue back to the west into Nebraska and with storms moving in an eastward direction this doesn't bode well for the flooding concerns. Flash Flood Warnings currently are in effect for Woodbury, Plymouth, Cherokee, Ida and Buena Vista counties; expect more rainfall over the next couple of hours and other counties to the east could also be included.

The severe weather threat is likely to be best off to the west of Iowa, over areas of central Nebraska for the most part. However, portions of western Iowa will likely see some isolated severe storms work into the area early tonight and continue through the nighttime hours over the remainder of the state. Currently, Sac county is under a severe thunderstorm warning for the possibility of nickel sized hail. Although a few storms might reach severe limits late this morning into early this afternoon, do expect another round of thunderstorms tonight. More details on the next round of thunderstorms and possible severe weather later today...