Following a spectacular Thunder over Louisville which featured temps in the low 80's, it has been all downhill from there.
The arrival of rain and storms cooled temps into the 70's yesterday and despite the arrival of some late day sun today, temps barely pushed into the low 60's.
So what's the culprit for the cold?
A large trough of low pressure has been building into the East-Central US over the last few days and is currently centered over the Western Great Lakes.
Unfortunately, thanks to a blocking pattern known as a "high over low block" that has been developing over the Western US, the "eastern trough" looks to remain in place for the foreseeable future.
So what does this mean?
This means that that unseasonably cold conditions will continue to pour into the area this week.
In fact, frost will be a possibility by the end of the week and this weekend could be just downright nasty.
The latest run (18z) of the GFS is now forecasting Saturday midday temps to run between 20 and 25 degrees below normal for this time of the year. That would put us in the 40's for possibly low 50's and would be accompanied by a cold rain. Not idea conditions for Derby Festival Events.
How long could the cold spell last?
According to the Climate Prediction Center, the next 6 to 10 days will likely feature below normal temps over the Eastern US.
Long-range data doesn't offer much help either with the CFS climate model indicating that the chilly weather could very well run through the first week of May as well.
For the latest on just how cold it could get this week, be sure to join Marc with a full update on WDRB News this evening.
WDRB Meteorologist Jeremy Kappell
Email me at firstname.lastname@example.org