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Good morning Action Weather Bloggers,
We had a wide range of low temperatures this morning. Temperatures ranged from 27º to 38º around the local region this morning. At 7 AM it was 27º at St. Joseph and 13 degrees warmer than that with KCI coming in at 40º at the same observation time. High pressure is sitting right over our area this morning and the lower lying locations had pockets of very cold air. You could probably have walked through your own neighborhood and gone up and down little hills with a thermometer and had these 5 to 10 degree differences in temperature. On my way home last night I watched the car thermometer go from 50º to 41º in about a two block distance. The sun does wonders, though, and we will all be near the same high temperature this afternoon. Forecasting low temperatures is often much harder than forecasting the afternoon high.
Another major warm-up is in the forecast for Thursday into Saturday. There is a very good chance that it will jump back into the 70s on Friday and Saturday with downslope warming and some rather warm air around 5,000 feet up heading right over us by Friday night. This first map shows the 850 mb (around 5,000 feet) flow with temperatures plotted in ºC.

It will likely warm into the 60s on Friday and Friday night at this level and with a nice south breeze at the surface we can expect 70s for highs Friday and probably Saturday. The flow higher up, around 18,000 feet (500 mb level), is showing the changing weather pattern.

The map above shows the predominantly zonal flow aloft but the buckling is about to begin. There is a very good chance of another western storm developing by Sunday. Take a look at the 500 mb forecast valid Sunday night:

This dry week of weather should come to an abrupt end early next week. But, coming out of strong zonal flow can be a very difficult pattern to forecast. When will the flow buckle? The 06z GFS showed it buckling by the weekend, but it could still be a day or two off. This pattern also is falling into what will be one of the pieces of the LRC puzzle this winter. We are atill working on our winter forecast which will be coming out two weeks from yesterday! There hasn't even been a chance of a snowflake in our entire viewing area so far. The deadline to enter our snowflake contest is a week from Saturday, so you still have time. I think we will have our first snowflake this month, but it takes an inch of snow to end the contest.
Have a great day and let us know if you have any questions. Here is a picture taken by Michael Martinez at Oak Grove Park near Oak Park High School. The leaves will continue falling, while a few more trees reach peak color this week. We have past the peak of the season, but there are plenty of trees left that still are absolutely beautiful.

Gary