WHAT IS A "JET STREAM"?

I've actually got quite a few emails asking me what a "jet stream" is. A jet stream is an area of strong winds that are concentrated in a relatively narrow band in the upper troposphere of the middle latitudes and subtropical regions of the Northern and Southern Hemispheres. Flowing in a semi-continuous band around the globe from west to east, it is caused by the changes in air temperature where the cold polar air moving towards the equator meets the warmer equatorial air moving polarward. It is marked by a concentration of isotherms and strong vertical shear.

TORONTO:

Tonight's Outlook: This evening we'll go to 21C with clear skies and 10km/h winds. Though tonight we'll come in touch with foggy skies and temperatures of 14C with 5km/h winds...and early morning Friday will be foggy with 14C temps, also. But by the afternoon we'll go all the way up to 27C with some cloudy periods and 10% chance of rain. It'll feel like 32C, though with southerly winds of 15km/h.

This brings me to my next topic...the forecast. Is it really an end to the heat? Well, no, you can plan an outstanding weekend ahead! We'll see some clouds on Saturday but its should stay dry with a high near 24C. Sunday will be sunny with a high near 23C. Perfect weather to plant some bulbs and get the yard winter ready. Better yet, ideal for sitting on a patio with friends and a few beverages. The warm spell will fade a little next Wednesday though. On Tuesday a stronger cold front will pull the Jet Stream south over Central Ontario. The following high will bring in a colder northerly wind as it approaches. Look for high temperatures to dip back into the upper teens. Not to worry, the air that's been hanging over Alberta isn't moving into southern Ontario any time soon. It was 6C this afternoon in Calgary and snow was falling in the mountains.

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Have a great day....I'll write tomorrow.

If you have a weather question, email me at city.weather@yahoo.ca