Mammoth Mountain Ski Patrol 2011-12 Storm Summary - Sesame Snow Study Site 9,000' (2,743m)
Date	New Snow	Base Depth	SWE	Rain	% Density	Storm Snow	Storm SWE	Season Snow	Season SWE	Season Precip	Base Hi Temp	Base Lo Temp	Notes
10/4/2011	1.0	~1	0.09	0.46	12	1.0	0.09	1.0	0.09	0.55			Automated instruments online in PM.  Rain derived by averaging Devil's Postpile and CUES.
10/5/2011	12.0	~12	2.04		17	13.0	2.13	13.0	2.13	2.59	41	28	Mixed rain and snow at onset.
10/6/2011	5.0	~15	0.64		13	18.0	2.77	18.0	2.68	3.23	26	21
10/7/2011	1.5	16.5	0.19		12	19.5	2.96	19.5	0.83	3.42	33	15	Ice crust on new snow board.  Depth sensor online 11:00.
10/11/2011	0.0	7.0	0.00	0.06	-	0.0	0.00	19.5	2.96	3.48
11/4/2011	5.0	5.0	0.36		8	5.0	0.36	24.5	3.32	3.84	40	16	MetOne precip gauge overcaught by 0.18" (~50%).
11/5/2011	1.5	7.0	0.10		6	6.5	0.46	26.0	3.42	3.94	24	8	MetOne precip gauge overcaught by 0.10" (50%).
11/6/2011	7.5	12.0	0.55		7	14.0	1.01	33.5	3.97	4.49	21	16	MetOne precip gauge undercaught by 0.06" (~11%)
11/12/2011	4.5	11.0	0.46		10	4.5	0.46	38.0	4.43	4.95	33	25
								38.0	4.43	0.46
11/20/2011	5.0	11.5	0.28		6	5.0	0.28	43.0	4.71	5.23	32	17
11/21/2011	6.5	16.5	0.56		9	11.5	0.84	49.5	5.27	5.79	23	11
12/1/2011	1.0	11.5	0.11		14	1.0	0.11	50.5	5.38	5.90	41	11
12/2/2011	0.5	12.0	0.12		20	1.5	0.12	51.0	5.50	6.02	20	11
12/5/2011	0.5	10.5	0.01		3	0.5	0.01	51.5	5.51	6.03	38	10
1/20/2012	1.0	4.5	0.21		20	1.0	0.21	52.5	5.72	6.24	35	23	Snow level ~8,500'.
1/21/2012	17.5	21.0	3.32		19	18.5	3.53	70.0	9.04	9.56	32	28	~2 of rain wetted snow on storm board.  All instruments freezing up, causing some data errors and undercatching of precip gauges.
1/22/2012	9.0	27.5	1.00		11	27.5	4.53	79.0	10.04	10.56	28	14
1/23/2012	19.0	41.0	2.38		12	46.5	6.91	98.0	12.42	12.94	27	17
1/24/2012	8.5	43.5	1.23		15	55.0	8.14	106.5	13.65	14.17	25	15
Date	New Snow	Base Depth	SWE	Rain	% Density	Storm Snow	Storm SWE	Season Snow	Season SWE	Season Precip	Base Hi Temp	Base Lo Temp	Notes
2/7/2012	Trace	31.0	0.01		-	Trace	0.01	106.5	13.66	14.18	37	17
2/8/2012	1.0	31.0	0.13		13	1.0	0.14	107.5	13.79	14.31	26	18
2/12/2012	1.0	29.5	0.12		12	1.0	0.12	108.5	13.91	14.43	33	16	Graupel.
2/13/2012	6.0	36.0	0.68		12	6.0	0.68	114.5	14.59	15.11	31	16
2/14/2012	3.0	35.0	0.23		8	9.0	0.91	117.5	14.82	15.34	20	13	Moderate North wind.
2/15/2012	8.5	44.5	0.48		6	8.5	0.48	126.0	15.30	15.82	34	11	Unusually large snowfall for a Northern event.
2/16/2012	1.5	43.0	0.09		5	10.0	0.57	127.5	15.39	15.91	17	11
2/27/2012	1.5	33.5	0.11		6	1.5	0.11	129.0	15.50	16.02	33	16
2/28/2012	4.5	38.0	0.25		6	6.0	0.36	133.5	15.75	16.27	18	8
2/29/2012	1.0	37.5	0.13		11	1.0	0.13	134.5	15.88	16.40	22	13	Mostly wind blown snow on the new snow board.
3/1/2012	7.0	44.5	1.00		14	8.0	1.13	141.5	16.88	17.40	22	14
3/2/2012	2.5	47.5	0.38		17	10.5	1.51	144.0	17.26	17.78	22	10
3/7/2012	4.5	43.0	0.54		13	4.5	0.54	148.5	17.80	18.32	21	1
3/14/2012	2.5	39.0	0.38		17	2.5	0.38	151.0	18.18	18.70	28	23	Melt freeze at new snow interface.
3/15/2012	0.5	40.0	0.13		22	3.0	0.51	151.5	18.31	18.83	31	26	Melt freeze snow on new snow board.
3/17/2012	28.0	62.0	4.10		14	28.0	4.10	179.5	22.41	22.93	31	21	Melt freeze snow on new snow board.
3/18/2012	11.0	76.0	0.87		8	39.0	4.97	190.5	23.28	23.80	24	10
3/19/2012	2.0	73.0	0.11		6	41.0	5.08	192.5	23.39	23.91	13	6
3/23/2012	0.5	56.0	0.13		26	0.5	0.13	193.0	23.52	24.04	39	25
3/25/2012	Trace	53.0	0.01		-	Trace	0.01	193.0	23.53	24.05	38	20
3/26/2012	5.5	59.5	0.57		10	5.5	0.58	198.5	24.10	24.62	24	16
3/27/2012	Trace	58.5	0.05		-	5.5	0.63	198.5	24.15	24.67	25	16
3/28/2012	5.0	61.0	0.68		13	5.0	0.68	203.5	24.83	25.35	32	21
3/29/2012	4.5	63.0	0.62		14	9.5	1.30	208.0	25.45	25.97	30	24
Date	New Snow	Base Depth	SWE	Rain	% Density	Storm Snow	Storm SWE	Season Snow	Season SWE	Season Precip	Base Hi Temp	Base Lo Temp	Notes
4/1/2012	5.0	60.5	0.54		11	5.0	0.54	213.0	25.99	26.51	32	13
4/6/2012	1.0	54.0	0.09		9	1.0	0.09	214.0	26.08	26.60	19	10
4/11/2012	Trace	46.0	0.05		-	Trace	0.05	214.0	26.13	26.65	42	23
4/12/2012	5.5	51.5	0.69		13	5.5	0.74	219.5	26.82	27.34	24	16	Snow depth highly variable due to wind.  New snow depth determined by base depth increase since new snow board was scoured.
4/13/2012	9.0	59.5	0.75		8	14.5	1.49	228.5	27.57	28.09	23	16
4/14/2012	12.5	68.0	2.17		17	27.0	3.66	241.0	29.74	30.26	21	14
4/15/2012	Trace	64.0	0.09		-	27.0	3.75	241.0	29.83	30.35	33	19
4/24/2012	0.0	33.0	0.00	0.05	-	-	-	241.0	29.83	30.40			Rain
4/26/2012	1.5	29.0	0.12	0.63	9	1.5	0.12	242.5	29.95	31.15	42	32	Mixed rain and snow
4/27/2012	0.5	31.0	0.10	0.46	20	2.0	0.22	243.0	30.05	31.71			Mixed rain and snow
All observations are made in the morning, therefore all measurements are for approximately the previous 24 hours.
Units for Base Depth, New Snow, Storm Total, and Season Snowfall are in inches.
SWE≡Snow Water Equivalent, the amount of water produced from melting a known volume of snow, measured in inches of H2O.
Season Precip includes SWE and rain since October 1st.
Units for 24 Hour Base Hi Temp and Base Lo Temp are degrees Fahrenheit.
Line breaks indicate clearing between storms, despite occasional consecutive days.