Flood Watch

* WHAT...Flash flooding caused by excessive rainfall is possible.

* WHERE...Portions of north central and northeast Illinois, including the following counties, in north central Illinois, Boone, Ogle and Winnebago. In northeast Illinois, McHenry.

* WHEN...From 1 AM CDT Saturday through Saturday morning.

* IMPACTS...Creeks and streams may rise out of their banks. Roads and streets may be flooded.

* ADDITIONAL DETAILS... - Showers and thunderstorms overnight into Saturday morning may produce widespread rainfall rates up to 2 inches per hour that could lead to flash flooding.

Additional thunderstorms Saturday evening into early Sunday morning have the potential to produce torrential rainfall that results in flash flooding, though the exact placement of this rainfall remains unclear. A second Flood Watch for flash flooding may be needed during this period. - http://www.weather.gov/safety/flood