See Bi-Monthly Summary Below. For best printing use "Landscape Display".										For a better display & printing, re-open in MS Excel if available.
					Lemhi Ridge Snotel Snow Data This Week							Friday, February 08, 2008
							Time -	Inches Snow Water	Avg Snow Water	SWE % of Avg	Inches Snow	Snow Depth	Snow Density	Inches Precip	Deg. F. Current	Deg F.  Prev Day Temp			Remarks
				Mon	Day	Date	PacSt	swEquiv	avgSWE	pctAVG	snDepth	dphChange	Pct.	(YTD)	Temp	Max	Min	Avg
	Starting Day/Time			Feb	Sun	02/03/08	0000	8.0	6.9	116%	35.7		22.4%	10.5	8.2	20.8	6.1	11.5
	Ending  Day/Time			Feb	Thu	02/07/08	0000	8.4	7.1	118%	38.0	1.1	22.1%	10.8	11.8	19.7	10.0	12.6
	Difference					4.0 Days		0.4	0.2	2%	2.3	2.3	-0.3%	0.3	3.6	-1.1	3.9	1.1
								Increase	Increase	Increase	Increase	Net Change	Decrease	Increase	Increase	Decr.	Incr.	Incr.
	Sum of All Snow Increases:   1st based on Daily Readings, then 3Hr Readings:										2.8	9.4	Thus my estimated actual snowfall is about 10" for this period.
	Sum of All Snow Reductions 1st based on Daily Readings, then 3Hr Readings:										-0.5	-7.1
	Lemhi Ridge Snotel					Wednesday, January 02, 2008						Bi-Monthly & Year to Date Snow Data
					Time -	Inches Snow Water	SWE % of 30 Yr Avg	Inches Snow	Snow Density	Inches Precip	Daily Depth Inc ToDate	Daily Depth Loss ToDate	3 Hour Depth Inc ToDate	3 Hour Depth Loss ToDate	Monthly NetChng ToDate	Deg F.  Prev Day Temp			Remarks
	Location	Mon	Day	Date	PacSt	swEquiv		snDepth	Pct.	(YTD)	cumIncr	cumRed	cumIncr	cumRed	cumChng	Max	Min	Avg
	LemhiRdg	Oct	Mon	10/01/07	0000	0.4		1.2	33.3%	0.0	1.2	0.0	1.2	0.0	1.2	44.5	23.9	34.6
	LemhiRdg	Oct	Mon	10/15/07	0000	0.0		0.0		1.3	8.9	-8.9	33.8	-33.8	0.0	50.2	32.5	40.7
	LemhiRdg	Oct	Wed	10/31/07	0000	0.7	100%	3.3	21.2%	2.8	17.2	-13.9	70.5	-67.2	3.3	40.6	23.0	31.5		34
	Oct Remarks					Actual snowfall probably about 30"														44
	October Minimums					0.0	0%	0.0	11.5%							31.1	19.6	25.2	Lowest Temp = 19.6
	October Averages					0.6	n/a	2.9	24.5%							44.2	29.1	36.1	Avg Temp = 36.1
	October Maximums					1.0	n/a	7.8	50.0%							61.3	42.8	49.9	Max Temp = 61.3
	More Oct Remarks					50% Density on Oct 13 w/ very min amt. of snow.
	LemhiRdg	Nov	Thu	11/01/07	0000	0.7	100%	3.3	21.2%	2.8	0.0	0.0	0.0	0.0	0.0
	LemhiRdg	Nov	Thu	11/15/07	0000	1.1	73%	4.8	22.9%	3.4	4.3	-2.8	24.9	-23.4	1.5
	LemhiRdg	Nov	Fri	11/30/07	0000	2.5	93%	12.8	19.5%	4.9	17.6	-8.1	59.5	-50.0	9.5					35
	Nov Remarks					Actual snowfall probably about 40"														9
	November Minimums					0.6	50%	1.4	15.4%							19.6	4.5	10.5	Lowest Temp = 4.5
	November Averages					1.4	82%	6.6	23.1%							37.6	21.3	29.1	Avg Temp = 29.1
	November Maximums					2.5	121%	14.9	42.9%							52.5	36.0	43.1	Max Temp = 52.5
	LemhiRdg	Dec	Sat	12/01/07	0000	2.5	89%	12.7	19.7%	4.9	0.0	-0.1	0.0	-0.1	-0.1
	LemhiRdg	Dec	Sat	12/15/07	0000	3.8	1%	19.2	19.8%	6.3	7.9	-1.5	30.7	-24.3	6.4
	LemhiRdg	Dec	Mon	12/31/07	0000	5.7	1%	29.7	19.2%	8.1	23.0	-6.1	67.5	-50.6	16.9					46
	Dec Remarks					Actual snowfall probably about 45"														12
	December Minimums					2.5	86%	12.5	17.1%							12.7	0.7	8.9	Lowest Temp = 0.7
	December Averages					4.0	105%	20.9	19.3%							23.4	10.6	16.5	Avg Temp = 16.5
	December Maximums					5.7	121%	29.8	21.3%							35.9	28.1	33.3	Max Temp = 35.9
	More Dec Remarks					The  last day with an above freezing temperature (Until Jan 02) was 12/04/07.
	LemhiRdg	Jan	Tue	01/01/08	0000	5.7	121%	28.9	19.7%	8.1	0.0	-0.8	0.0	-0.8	-0.8
	LemhiRdg	Jan	Tue	01/15/08	0000	6.7	114%	29.9	22.4%	9.4	6.3	-6.1	26.4	-26.2	0.2
	LemhiRdg	Jan	Thu	01/31/08	0000	7.7	114.9%	33.8	22.8%	10.2	15.5	-11.4	55.1	-51.0	4.1					31
	Jan Remarks					Actual snowfall probably about 55"														8
	January Minimums					5.7	111%	26.3	19.7%							2.5	-20.9	-10.0	Lowest Temp = -20.9
	January Averages					6.7	115%	30.8	21.8%							24.7	8.3	15.9	Avg Temp = 15.9
	January Maximums					7.7	121%	34.4	23.5%							41.1	24.3	29.8	Max Temp = 41.1
	More Jan Remarks					The  last day with an above freezing temperature (Until Jan 02) was 12/04/07.
	LemhiRdg	Feb	Fri	02/01/08	0000	5.7	121%	28.9	19.7%	10.2	1.0	0.0	1.5	0.0	1.0	12.0	2.1	8.5
	LemhiRdg	Feb	Fri	02/07/08	0000	5.7	100%	26.2	21.8%	10.8	5.3	-1.1	16.7	-12.0	4.2	26.0	1.5	13.2
	LemhiRdg	Feb	Fri	02/29/08	0000															0
	Feb Remarks																			0
	February Minimums					7.8	113%	34.8	21.9%										Lowest Temp =
	February Averages					8.1	116%	38.5	22.2%										Avg Temp =
	February Maximums					8.4	118%	38.0	22.4%										Max Temp =
	More Feb Remarks
	As of 02/07/2008 01:00 PM MST
	Year to Date Sums					8.4		38.0		10.8	78.6	-40.6	269.3	-230.8	38.0					157
	Monthly 3 Hour Increases and decreases.															Actual snowfall probably about 190"				190
	Year to Date Minimums					0.0	0%	0.0	11.5%							12.0	0.7	8.5	Lowest Temp = 0.7	174
	Year to Date Averages					3.5	138%	16.5	22.2%							34.7	19.9	26.9	Avg Temp = 26.9
	Year to Date Maximums					8.4	n/a	38.0	50.0%							61.3	42.8	49.9	Max Temp = 61.3
	Actual snowfall is usually measured on a sheltered surface that's cleared of snow once or twice a day. Snotel has no comparable measurement. A depth sensor measures the distance down to the snow surface to calculate the depth. One might assume that the difference between the daily readings would give the amount of snowfall for that day. However the snowpack always settles and often settles faster than the new snow accumulates. Thus comparing daily readings will almost always underestimate the actual snowfall. Our Snotel sites also record 3 Hour readings. If one adds up all the increases (and ignores decreases) they may come close to the actual snowfall amount;  especially during periods of heavy snowfall. However during periods of light or little snowfall the 3 hour readings can sometimes overestimate actual snowfall. I think this is because there is sometimes fluctuation in the depth sensor readings. They might go from 10.0" to 10.1" and back again several times when there apparently was no snow. The sum of all this type of "increase" would overestimate snowfall. Apparently depth sensors can miss very light fluffy snow and this may explain the anomaly.
	I'm sure that the 3 hour readings gave an over-estimate of snowfall during October through early December. (About the time temperatures remained below freezing.) However since that time the opposite seems to be the case. The actual snowfall (based on actual measurement taken nearby) has been somewhat more than the sum of the three hour readings.
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