Saturday, April 23, 2016

Big Temperature Difference next Week

Summer-like temperatures will make a return on Sunday and Monday with highs pushing into the upper 70s to near 80°. Partly cloudy skies are expected on Sunday as we remain dry. A stationary/hybrid cold front will sag south towards the region on Monday. A low pressure system will also approach from the west. These two features will support scattered showers and even some thunderstorms Monday afternoon and evening. Humidity values will be up on Monday as well, with dew points possibly exceed 60°, which will be one of the more humid days of the year so far. However, the threat of severe weather looks very low to near zero on Monday.

That front will be a very big player in terms of temperatures next week. Once it moves through late Monday night, temperatures could fall 10-20° in a matter of minutes as winds shift to northerly and cold air filters into the region from the north. The front itself will likely reside just to our south Tuesday-Thursday, which means we can expect much cooler air in the Stateline as opposed to the 70s and 80s for Central and Southern Illinois. High temperatures next Tuesday, Wednesday and Thursday will likely stay in the 50s to potentially 60°.

That large temperature gradient will play to our benefit come Wednesday as a very potent storm system tracks towards the state. It will bring powerful storms and tornadoes to portions of the Plains on Tuesday. That severe threat pushes east on Wednesday to include portions of Illinois. Due to our location north of that stationary front, though, we will be too cool and stable to see that severe threat this far north. The exact location of that front could change between now and next week, so it is something we will have to continue watching, but for now the severe threat here in Northern Illinois and Southern Wisconsin looks very low.

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