Cloud cover will continue to thicken up Monday evening ahead of a cold front that'll pass through the region Tuesday morning. A few showers have been developing on radar but the dry air mass at the surface has prevented a lot of the rain from actually reaching the ground. Nonetheless, a shower or two can't be ruled out around 8pm/9pm.
Increasing winds in the jet stream Tuesday morning will allow a few showers to occur, but mostly for those south of I-88. A quick push of dry air Tuesday afternoon will allow skies to clear and temperatures to warm into the upper 60s. This warmth combined with colder temperatures aloft will cause the air to rapidly rise from the surface. This quick rising air will help increase some of the instability in the atmosphere, despite dew point temperatures only in the upper 40s, to right around 50 degrees.
A few isolated thunderstorms will be possible during the afternoon and early evening, with the greatest chance lining up from around McHenry County, down through DeKalb, Ogle, and Lee counties. Within the stronger thunderstorms hail up to quarter size (one inch in diameter) will be possible. There is also a small chance that we may see some funnel clouds develop, especially for any storm that forms right along the surface boundary. The chance for that is low, but it's there.
Once the storm threat passes skies will turn partly cloudy as high pressure moves across the eastern Great Lakes. Temperatures Tuesday night will fall into the low to mid 30s. Winds will remain slightly elevated which should prevent frost from developing, but patchy frost may be possible for some early Wednesday. A better chance for frost will occur Wednesday night and Thursday morning.
No comments:
Post a Comment