Tuesday, September 22, 2009

Quick Post on Winter Forecast ideas

Quick post here showing that the atmosphere is starting to show signs and clues of its winter Pattern. Here is the latest 8-14 Analog composite of the 500mb flow center on October 3rd. Notice the reds in Canada representing ridging aloft or warmer than normal heights. As the height lines indicating the flow moving from a ridge off the West Coast. To a fast west to east flow across the lower 48 with lower than average heights. This indicates an active jet stream under an area with higher heights helping to develop high pressures across Canada. So Cold areas of high pressure in Canada with an active jet stream underneath. Hmm can you see what clues i'm pointing out and what kinda of winter we might being headed to?
Looking at the latest ensembles I believe October will come in like a lion. Stormy weather with possible severe weather and heavy rains will set up from the Southern Plains and into the Mississippi, Ohio Valley. As the Northern Rockies get their first cold shot of air with first significant snowfall. As you can see a nice jet indicated by the packed height lines in the above graphic. As NAO looks to be tanking in the negative side by around the 7th of October indicating a trough in the East. PNA looks to be near neutral for the time period so a firehouse jet might come into the West. This is really good as they need the cool down and rainfall to increase to damper the fire threat. AO index looks to go negative then strong positive then strongly negative. This would be an good indication that there will be a good source of some cross Polar air from Siberia. High temperatures currently are in the 20s and 30s with lows in the teens. However have been drastically decreasing over the couple of weeks. So all together winter is preparing itself but we still have a good month or so. The United States really don't start seeing snow storms outside the higher elevations till after Halloween.

Thanks for reading and please leave your comments on my guest book.
Justin

1 comment:

Angie Kay said...

Loving the fall air. Crisp and cool makes us all want to act like fools and run around and play in the falling leaves and watch the golden-hued sunsets. Excited about your winter forecast and wanting to relive my childhood and make a giant snowman or in this case a politically correct snow woman. Mother nature is a fickle woman, while most of us expect father fall for halloween, our lovely mother nature sometimes suprises us with a kiss of snow on halloween here in Oklahoma. Bring on the ice and snow, I am ready for mother natures winter show!!