Looking back on April 9th, 2015

Last Thursday was our first taste of severe weather for the season and it was a very eventful day. The event started with a deepening, fast moving low pressure system. This low pressure system was the driving force for converging and gusty surface winds that evening. There was a strong frontal boundary difference making way for backing winds near the boundary helping rotation. The surface was very moist with dew-points observed at Rochelle and Sterling reaching 66° at one point. This became a perfect setup for a large and dangerous tornado.

The night began with some scattered strong thunderstorms, but no Tornado Warnings were issued until 6:09 PM and that is when storms started to fire up all across the Northern Illinois region.

TOR Timeline 9th

The first Tornado warning was for a radar signature of rotation just south of Cherry Valley. Soon after at 6:35 PM was the first issued Tornado Warning for a large wedge tornado near Ashton. Finally all tornado warnings had expired around 7:45 PM.

So far throughout the state of Illinois there have been 8 confirmed tornadoes. Four of these tornadoes were confirmed in the Stateline.

tornadoes april 9th

The strongest tornado being an EF-4 that tracked across Lee, Ogle, and DeKalb counties. This was the first EF-4 tornado on record in the Northern Illinois region since the community of Washington was struck by one in November of 2013. Wind speeds associated with this EF-4 Tornado were around 180-200 mph. This was the major tornado produced with this storm. There have been 2 fatalities confirmed with this tornado and more than 20 people injured. Structures in the small town of Fairdale, IL have been almost completely swept away.

The EF-4 was not the only tornado in the Stateline that was destructive. An EF-1 tornado with wind speeds up to 110 mph roared through areas just south of Belvidere. This EF-1 tornado first touched down near Flora Road where it impacted a zoo.  Two zoo animals died as a result of the damage caused by the tornado.

Then there were the two EF-0 tornadoes that were south of Cherry Valley and just south of Lindenwood that had little to no damage associated with them.

Here is a graphic posted by the National Weather Service in Chicago of the tracks of the four tornadoes.

nws tor tracks

This photo can be found on their Facebook and I have posted the link below. Also, surveying has not been completed all the way yet by the National Weather Service and when they come out with their newest information we will be sure to pass that along to all of you!

– Nick Jansen

National Weather Service Facebook post:

https://www.facebook.com/NWSChicago/photos/a.170461579677551.41001.164132806977095/900816173308751/?type=1&theater

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Posted under severe weather, tornado, weather

This post was written by Alex Kirchner on April 11, 2015

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