Rockford Scanner™: Hydrological Outlook

Hydrologic Outlook
National Weather Service Chicago IL
443 AM CDT Sat May 12 2018


Multiple heavy rain producing thunderstorms may train over the
same areas of northern Illinois tonight and again on Sunday night.
Because of this, localized areas of northern Illinois could
experience rainfall amounts in excess of 2 to 3 inches tonight,
with additional heavy rainfall possible Sunday night. Because of
this, there will be an increased threat of flash flooding,
particularly if the heaviest rain producing storms train over the
urbanized areas of Chicago and Rockford. This heavy rain will
also likely result in significant rises and possible flooding on
area streams and rivers. Stay tuned to the latest forecast


Rockford Scanner™: Possible Tornado Siren Malfunction in Roscoe

We are not sure at this time why they are going off, but are digging more into that issue and will post updates as we find out more.

The threat for severe weather doesn’t come back into the picture for the area until Saturday.
So hopefully this will get resolved before then, but until then please have alternative ways of receiving weather updates just in case!


Rockford Scanner™: Severe Weather Possible Today

There is a Marginal Risk (1 out of 5) for Severe Weather across our area this afternoon and evening, with the main threats being damaging wind and hail.


The line of showers and storms that  moved this morning were associated with the passing of the warm front that will set up to our north in Southern Wisconsin.  Putting us in what we like to call the “warm sector” of the low pressure system center over Northern Iowa.  Our threat for severe weather this afternoon and evening will come with the passing of a cold front as the low pressure tracks to the northeast across Southern and Central Wisconsin.

The latest model runs have isolated thunderstorms developing around 2 pm across North Central Illinois along and just ahead of the previously mentioned cold front (pictured below).



By 5 pm, a broken line of storms will develop to the east of the Rockford area along that cold front and progress to the east across far Eastern Illinois and Northern Indiana into the evening and overnight hours where the greater threat for damaging winds, hail, and even an isolated tornado can’t be ruled out (pictured below).  The threat for severe weather ending by around 6pm for the Rockford area.


Overall the severe threat this afternoon and evening should be