CMH Bobbie-Burns, Canada - BC

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6 Day Weather Forecast for 2216 m altitude, issued (local time): 09 am 17 May 2008

	Days 0-3 CMH Bobbie-Burns Weather Summary: Moderate rain (total 17.0mm), heaviest on Mon afternoon . Very mild (max 15°C on Sat morning, min 2°C on Mon night). Wind will be generally light.									Days 4-6 CMH Bobbie-Burns Weather Summary: Mild with moderate rain (total 10.0mm) on Tue morning, Becoming colder with a light covering of snow, mostly falling on Tue night. . Freeze-thaw conditions (max 4°C on Tue morning, min -4°C on Wed night). Wind will be generally light.
	Sat 17 morn- ing	Sat 17 after- noon	Sat 17 night	Sun 18 morn- ing	Sun 18 after- noon	Sun 18 night	Mon 19 morn- ing	Mon 19 after- noon	Mon 19 night	Tue 20 morn- ing	Tue 20 after- noon	Tue 20 night	Wed 21 morn- ing	Wed 21 after- noon	Wed 21 night	Thu 22 morn- ing	Thu 22 after- noon	Thu 22 night
Wind (km/h)
Summary	some clouds	some clouds	clear	rain shwrs	light rain	light rain	light rain	mod. rain	light rain	mod. rain	light snow	light snow	light snow	light snow	snow shwrs	some clouds	light snow	light snow
Snow cm	-	-	-	-	-	-	-	-	-	-	1	2	1	1	-	-	-	1
Rain mm	-	-	-	1	1	3	1	6	5	6	4	-	-	-	-	-	-	-
Max °C	15	15	7	9	7	4	4	4	3	4	2	-1	-1	0	-2	3	4	0
Min °C	14	10	4	8	5	3	4	3	2	3	0	-2	-1	-1	-4	1	0	-3
WChill °C	13	8	1	6	2	0	1	-1	-2	-2	-4	-7	-7	-7	-9	-3	-4	-9
Freezing level (m)	4300	4100	3750	3300	3100	2950	2850	2950	3150	2850	2600	2100	2050	2250	1850	2250	2550	2050
Sunrise	3:53	-	-	3:51	-	-	3:50	-	-	3:48	-	-	3:47	-	-	3:47	-	-
Sunset	-	19:34	-	-	19:35	-	-	19:37	-	-	19:37	-	-	19:38	-	-	19:40	-

The above table gives the weather forecast for CMH Bobbie-Burns at the specific elevation of 2216m. Our sophisticated weather models allow us to provide snow forecasts for the top, middle and bottom stations of CMH Bobbie-Burns. To access the weather forecasts for the other elevations, use the tab navigation above the table. For a wider view of the weather, check out the Weather Map of Canada.

NOTE ABOUT FREEZING LEVELS AND TEMPERATURES
The freezing level that we forecast CMH Bobbie-Burns is the  free air freezing level. (More specifically, it is the uppermost free air freezing level). This means that all of the air above this elevation is below freezing however it does not necessarily imply that all of the air below it is above freezing.  We provide this because it best describes the level where falling snow first starts to turn to rain. On average, snowflakes only stay frozen for about 100 metres (300 feet) below the free air freezing level. That's because air temperatures usually increase steadily as you descend - but not always.  For example, a temperature inversion describes a pool of cold air near the ground with a layer of warmer air above it. This is a common occurrence in winter when the wind is light. Such pools of dense cold air can vary from a few metres to several kilometres deep and can persist from hours to several weeks. In an inversion, it can be simultaneously below freezing in a mountain valley, and also at a nearby summit, yet above freezing at some elevation in between. Most visitors to the Alps are very familiar with this. Such conditions can allow snow to fall much more than the usual 100 metres below the top freezing level, even reaching the valley, just as long as snow did not pass through enough warm air to melt. Otherwise, freezing rain or re-frozen soft hail (there is even a German word for it - graupel) reaches the valley instead. Our forecasts allow for these possibilities which is why you may see forecasts of snowfall and frost at elevations far below the free-air freezing level, or valley temperatures that are lower than summit temperatures. You may even see forecasts of rain to fall even though it is just below freezing at the surface - that happens if our model predicts that there is a deep warm layer just above. None of these are as contradictory as they may seem at first.

All of our temperature forecasts for CMH Bobbie-Burns are for the ground, not the air. These can be very different to free-air temperatures, especially at night. This can lead to what looks like a contradiction. Because the ground is such a good radiator of heat (especially on clear nights when there is a snow cover and the wind is light) surface temperatures often fall more than far below the free air temperatures - sometimes by more than 10 degrees. On such occasions, the snowpack freezes at elevations that are far below the free air freezing level. For example, in the European Alps, snow tends to freeze in valleys on still clear and still nights  even if the free air freezing level is above 3000m simply because snow is so efficient radiating its heat away. In reality there are two freezing levels; one just above the snow surface and another at 3000m with a layer of warmer temperatures in between where the snow may not freeze at all. In summary, the reason we provide surface temperatures isbecause these determine the condition of the snowpack.

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