Here Comes the Canadian Air Again!

The lower atmosphere was very dry across the Stateline this afternoon with the relative humidity running a very low 20 to 25%. So, when a relatively strong mid level disturbance approached from southeastern Minnesota this evening all it could produce was virga with a couple of drops actually reaching the ground before evaporating. That disturbance, and the clouds associated with it will move off to the east leaving skies mostly clear later tonight. The overnight low will be near 39 degrees. The very dry air will be in place again on Monday, and a re-enforcing cold front will move through in the middle of the day. It will be mostly sunny with a high around 59 degrees. The temperatures are expected to begin dropping by early to mid afternoon with the passage of the front. It will become quite windy, too, with winds picking up to 20 to 30 mph in the afternoon with gusts as high as 35 mph. It will be mostly clear and breezy on Monday evening. The wind will subside overnight, but will remain breezy enough to prevent frost formation, even though the temperature may drop as low as 30 degrees by daybreak on Tuesday.  A large Canadian high ridging from central Canada southward across the northern plains will have a relative tight gradient across the upper mid west. That means that colder Canadian air will pour into the Stateline through Wednesday. Temperatures at night will be close to, or slightly below freezing, on Tuesday and Wednesday night.  The best chance for a heavy frost will be on Wednesday night when the skies will be clear, and the winds light with the high passing overhead.  It will still be mostly sunny early on Thursday, but the wind will shift to the south, and clouds will increase in the afternoon.  It will be warmer on Thursday with a high in the upper 50's.  A flow of moisture out of the western Gulf of Mexico will begin reaching the Stateline on Thursday night.  Scattered showers will be possible overnight.  On Friday, Saturday, and Sunday a complex area of weather systems will develop, and hold to our west.  The Gulf of Mexico will remain open.  Skies will be mostly cloudy with chances of showers and thunderstorms each day.  There is the possibility that some of these thunderstorms will quite strong capable of producing heavy rains.  Temperatures will be mild, topping out in the upper 60's on Saturday and Sunday.