UpdateJune 26th, 2013 at 10:14 am by Chad Evans under Chad's WLFI Weather Blog
Several scattered storms, storm clusters & line segments of storms are approaching from the west & are located just northeast & south of the viewing area.
Scattered storms with a couple of line segments of storms will pass this morning through midday. Isolated severe gusts are possible, along with isolated hail. Torrential rainfall will accompany the heaviest storms (2-3″ per hour).
Through the afternoon, scattered storms are possible (isolated wind/hail) with a tendency (per hi-res model data from RPM to HRRR to WRF) for a line of storms to congeal in eastern Illinois & sweep viewing area in the evening.
As long as it stays cloudy & a bit cooler, severe threat with it & any other storm will tend to be isolated, but if the sun comes out for an extended period of time, severe threat will go up.
Regardless, stronger mid & upper flow may cause this line to form & with it, again some isolated severe gusts will develop (& isolated hail). Again, if there is more sun ahead of it, wind threat will go up & increase in coverage & intensity.
Torrential rainfall rates are possible with it.
That said, with any scattered storms, line segments, clusters or that eventual line, torrential rainfall may result in flash flooding. Thus, NWS has Flash Flood Watch for entire viewing area through today & tonight.