Good morning bloggers,
This could be the wildest weather week of the season so far. A WIND ADVISORY is in effect today for winds possibly gusting higher than 45 mph. These south winds will transport some moisture northward, but there is nothing really there to trigger any rain showers or thunderstorms. As the STRONGEST cold front of the season approaches tonight a few showers and thunderstorms will be possible, but right now we are thinking around a 30% chance. Look below at the surface map forecast for noon today.

Yes, you are looking at this correctly. There is a 110 degree contrast expected this afternoon from southern Canada, where -20 to -30 degree air will be blasting into Montana. WOW! The cold front should arrive early on Tuesday dropping us from the 50s into the 20s. Then, there is a chance of snow twice this week. The first chance will come with storm #1 on Tuesday. Look below at the forecast map, at 500 mb (18,000 feet up), valid 6 AM Tuesday.

The X, on the New Mexico, Texas Panhandle border is a fast moving shortwave trough (a vorticity maximum, or weak upper level storm, we use all of these terms to describe this feature). We have had a system like this a couple of times this season. Will it separate enough to create what we call PVA (positive vorticity advection). PVA causes lift in the atmosphere. But, we will also have the very strong cold front moving through Tuesday morning, which will cause strong cold advection (cold air moving in from the north). Cold air advection causes the air to sink. So, it will be a battle of the PVA against the cold advection, and if that upper level storm, vort max, can hold together then the PVA could win out and we may see a two hour period of snow, enough to accumulate just a bit on Tuesday. We will be looking at this possibility on the new data this morning.
Then, there is a storm #2 continuing to show up on Thursday. We have also seen this type of storm a few times this season. Confidence is high that it will snow on Thursday afternoon and evening. We will go into more details on this storm #2 later today. There is also a wet and strong storm #3 showing up for early next week. That one has the chance of producing rain and snow. The models are leaning towards rain, but it is a week away. There is a storm #4 showing up as well after this one.
Arctic air is becoming established, and quite impressive, over most of Canada this week. I will be shocked if we don't get a huge chunk of this to come down within the next two weeks. So, it is back to winter, our series of storms is now beginning, as forecast by the LRC weeks ago. What will happen? We are getting onto the ride today and going up and down, and spinning upside down and all over the place in the next two weeks. Let's enjoy the ride and our team of meteorologists at NBC Action News will be your tour guide through this exciting stretch.
Have a great start to your week. Don't forget we have a brand new show at 11 AM each week day morning. Brett Anthony (today is Brett's birthday) will be providing you with weather updates throughout this brand new hour on NBC Action News.
Happy birthday to Brett!
Gary