A FLASH FLOOD WATCH has been issued for parts of northern Illinois beginning Thursday evening and lasting through Friday morning. Rainfall totals ranged between 1.0 and 2.5 inches Wednesday night and Thursday morning (areas shaded in blue). We've had a little break in the rain activity Thursday afternoon with skies remaining mostly cloudy, although there are a few breaks beginning to develop as the thick cirrus cloud deck overhead begins to thin some.
Most of the instability for the rest of this afternoon and evening will
remain focused across southern Iowa and central Illinois as the rain
this morning helped to push the frontal boundary a little more to the
south. Having said that, moisture continues to stream into northern
Illinois with dew point temperatures quickly rising into the low to mid
60s.
Thunderstorms are expected to develop to the southwest late Thursday
evening, quickly lifting
northeast into northern Illinois Thursday
night. The biggest concerns locally will be heavy rainfall, especially
following the heavy rain from early Thursday morning. Stronger
thunderstorms may be capable of strong wind gusts as well. Another one
to two inches of rain will be possible by Friday morning, with rainfall
totals over two inches along and south of I-80. Flash flooding will be
possible, especially in the areas highlighted under the flash flood
watch, later tonight. Quick river rises may also occur with the
additional rainfall Thursday night. Those in flood prone areas, or
along any of the local rivers, should watch for flooding.
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