Mammoth Mountain Ski Patrol 2016-17 Storm Summary - Sesame Snow Study Site 9,000' (2,743m)
Date	HN24(")	Base Depth	SWE	Rain	% Density	StormSnow "	Storm SWE "	Storm Rain	Season Snow	Season SWE	Season Precip	Base Hi Temp	Base Lo Temp	Notes
10/17/2016	3.5	3.5	1.25	Y	35	3.5	1.25	4.96	3.5	1.25	6.21	42	31	Storm was from 10/15 to 10/17.  Only snow was at end of strorm.  Obvious rain crust on upper hill. Storm precip 6.21"
10/31/2016	6.0	6.0	1.30	Y	21	6.0	1.30	4.62	9.5	2.55	12.13	39	24	Strom was from 10/28 to 10/31.  Only snow at Main Lodge was at end of storm.  Storm Precip 5.92"
Oct. Total	9.5		2.55
11/27/2016	11.0	11.0	1.30	N	12							32	18	Majority of snow fell overnight
11/28/2016	1.0	12.0	0.14	N	14	12.0	1.44	0.00	21.5	3.99	13.57	28	18	Lingering showers during operation hrs 11/27
Nov. Total	12.0		1.44
12/8/2016	5.0	12.0	0.70	N	14							30	22	Snow fell overnight.  Freezing rain during op hours to the top.  Left 1/2" rain crust over 8- 10" top face runs
12/9/2016	0.5	12.0	0.10	Y	20							32	29	Last .5" early AM then rain during day
12/10/2106	0.0	11.0	0.00	Y	0	5.5	0.80	0.68	27.0	4.79	15.05	34	29	Brief clearing but top never opened.
12/11/2016	7.0	17.5	1.20	N	17	7.0	1.20	0.00	34.0	5.99	16.25	30	26	Overnight snow with strong upper elevation winds
12/13/2016	0.0	16.0	0.00	Y	0	0.0	0.00	0.07			16.32	33	26	Meh!
12/15/2016	0.5	16.0	0.10	N	20
12/16/2016	39.0	52.0	5.03	N	13	39.5	5.13	0.00	73.5	11.12	21.45	31	28	14" and 1.95" of H2O fell during operation hrs on 12/15.  The rest was overnight
Date	HN24(")	Base Depth	SWE	Rain	% Density	StormSnow "	Storm SWE "	Storm Rain	Season Snow	Season SWE	Season Precip	Base Hi Temp	Base Lo Temp	Notes
12/24/2016	16.5	54.0	1.80	N	11							27	12	5.5" of snow fell during operation hours on 12/23.  The rest was overnight.
12/25/2016	0.0	52.0	0.06	N	12	16.5	1.86	0.00	90.0	12.98	23.31	17	5	Overnight wrap around.
Dec. Total	68.5		8.99
1/4/2017	21.5	64.0	2.35	N	11							24	15
1/5/2017	19.0	79.0	3.80	N	20							30	25	11.0 fell during operating hrs 1/4/2017
1/6/2017	2.0	73.5	0.45	N	22	42.0	6.60	0.00	132.0	19.58	29.91	29	4	Lite snowfall after 5am yesterday morning and blowing snow all day.  Clear skies Top opened.  Big results in Wipes/Drops
1/7/2017	1.0	74.5	0.06	N	6							29	12	Socked in around 4am lite snow thick clouds
1/8/2017	15.0	93.0	2.40	Y	16							32	23	10"/1.9"H2O fell during operation hrs 1/7. Began to rain at least to top Ch3 at 9am.  Turned back to snow around Noon.
1/9/2017	16.5	99.0	5.20	Y	33	32.5	7.66	2.14	164.5	27.24	39.71	36	28	Short break between storms but never cleared or completely stoppped precipitating.
1/10/2017	16.5	109.0	2.00	N	12							29	21	4.5" and .95 h2o fell during ops hrs 1/9.
1/11/2017	15.0	120.0	2.45	N	16							24	21	5.0" and .65h2o fell during op hrs 1/10
1/12/2017	10.5	134.0	0.95	N	9							21	18	2" snow and .32"h2o fell during ops hrs 1/11
1/13/2017	24.5	138.0	1.45	N	6	66.5	6.85	0.00	231.0	34.09	46.56	20	11	22" snow and 1.3"h2o fell during ops hrs 1/12  what a day!
Date	HN24(")	Base Depth	SWE	Rain	% Density	StormSnow "	Storm SWE "	Storm Rain	Season Snow	Season SWE	Season Precip	Base Hi Temp	Base Lo Temp	Notes
1/19/2017	19.0	135.0	2.60	N	13							34	21	All snow but 1/2 inch fell overnight.
1/20/2017	8.0	139.0	0.65	N	8	27.0	3.25	0.00	258.0	37.34	49.81	22	17
1/21/2017	26.5	155.0	2.41	N	9							20	14	15.5 fell during ops hrs 1/20.  Partial clearing at lower elevations, clear in town.  Start of new storm 10pm
1/22/2017	12.5	159.0	1.47	N	12							20	14	Ops at main lodge cancelled for day
1/23/2017	33	159.0	3.61	N	11							26	14	Ops at main lodge cancelled for day
1/24/2017	5.0	173.0	0.35	N	7	77.0	7.84	0.00	335.0	45.18	57.65	17	2	Great skiing day
Jan. Total	245.0		32.20
Date	HN24(")	Base Depth	SWE	Rain	% Density	StormSnow "	Storm SWE "	Storm Rain	Season Snow	Season SWE	Season Precip	Base Hi Temp	Base Lo Temp	Notes
2/2/2017	2.5	147.0	0.25	N	10							41	21
2/3/2017	4.5	149.0	0.64	N	14							31	21	2.0"/.24 fell during ops hrs on 2/2
2/4/2017	7.5	154.5	1.26	N	17	14.5	2.15	0.00	349.5	47.33	59.80	29	23	4.0"/.91 fell during ops hrs on 2/3
2/6/2017	8.5	159.0	1.20	N	14							34	22
2/7/2017	13.0	171.0	2.10	M	16							28	25
2/8/2017	11.0		3.00	Y	27							32	28
2/9/2017	2.0		0.06	M	30	34.5	6.36		384.0	53.69	66.16	39	32
2/10/2017	16.5	182.0	2.25	M	14							32	31
2/11/2017	17.0	193.0	2.17	N	13	33.5	4.42		417.5	58.11	70.58	28	21
2/16/2017	2.5	176.0	0.30	N	12	2.5	0.30	0.00	420.0	58.41	70.88	41	33	Short day time cell then cleared by afternoon.
2/17/2017	21.0	189.0	1.63	N	8							33	21	Started snowinig around 4am.  All but 3.5/.3 fell during ops hrs
2/18/2017	14.0	200.0	0.90	N	6	35.0	2.53	0.00	455.0	60.94	73.41	29	24	All snow was after ops hrs.  Clear day but crawling eye over mammoth.
2/20/2017	8.5	199.5	1.05	N	12							30	23	2' fell during ops 2/19
2/21/2017	19.5	210.5	3.70	N	19							29	24	10"/1.45"SWE fell during ops hrs 2/20
2/22/2017	12.0	215.0	2.15	N	18							28	19	4.0"/.8"swe fell during ops hrs 2/21
2/23/2017	2.5	211.0	0.25	N	10	42.5	7.15	0.00	497.5	68.09	80.56	25	6	1.5"/.2" fell during ops hrs 2/22.  Had a morning clearing
2/24/2017	1.5	209.0	0.20	N	13	1.5	0.20	0.00	499.0	68.29	80.76	19	1	Light snow showers pm of 2/23 and overnight
2/27/2017	3.5	203.5	0.28	N	8							28	3	All overnight snow.  Started around 4am.
2/28/2017	2.5	205.5	0.15	N	6	6.0	0.43	0.00	505.0	68.72	81.19	28	12
Feb. Total	170.0		23.59
Date	HN24(")	Base Depth	SWE	Rain	% Density	StormSnow "	Storm SWE "	Storm Rain	Season Snow	Season SWE	Season Precip	Base Hi Temp	Base Lo Temp	Notes
3/5/2017	2.0	197.0	0.18	N	9							32	18	Snow started around 4am.
3/6/2017	8.5	202.0	1.16	N	13	10.5	1.34	0.00	515.5	70.06	82.53	18	6	6.0/.65 fell during ops hrs on 3/5
3/21/2017	2.5	170.0	0.30	N	15							41	30	Snow fell in early morning before daily operations.  Rain snow mix at Canyon and Eagle
3/22/2017	7.5	176.0	1.45	N	20							31	25	4"/.80" fell during ops 3/21
3/23/2017	3.0	177.0	0.28	N	9	13.0	2.03	0.00	528.5	72.09	84.56	26	11
3/25/2017	11.0	202.5	1.10	N	10	11.0	1.10	0.00	539.5	73.19	85.66	31	25	2"/.2"H2o fell during ops hrs on 3/24
3/27/2017	1.5	199.5	0.20	N	13	1.5	0.20	0.00	541.0	73.39	85.86	37	22	Afternoon cell on 26th cleared in evening
3/30/2017	0.5	190.0	0.13	N	26							55	30
3/31/2017	2.0	187.0	0.20	N	10	2.5	0.33	0.00	543.5	73.72	86.19	32	15
Mar. Total	38.5		5.00
Date	HN24(")	Base Depth	SWE	Rain	% Density	StormSnow "	Storm SWE "	Storm Rain	Season Snow	Season SWE	Season Precip	Base Hi Temp	Base Lo Temp	Notes
4/7/2017	15.0	178.0	2.30	N	15							40	25
4/8/2017	21.0	195.0	3.80	N	18							30	23	Strong winds.  Blow down day at main. 14"/2.2"H2o fell during ops on 4/7
4/9/2017	7.5	200.0	1.00	N	13	43.5	7.10	0.00	587.0	80.82	93.29	23	2	5"/.62"H20 fell during ops 4/8
4/12/2017	1.5	193.0	0.20	M	13	1.5	0.20		588.5	81.02	93.49	42	32	Rain snow mix up to top of Ch3
4/14/2017	5.5	196.0	0.90	N	16	5.5	0.90	0.00	594.0	81.92	94.39	29	19	3.5/.5H20 fell during ops on 4/13
4/17/2017	4.0	191.5	0.90	Y	23							42	31	Upside down storm, snow then rain.  All moisture fell overnight into early AM
4/18/2017	6.5	194.0	1.10	Y	17							35	32	Rained during ops hrs 4/17.  Snow overnight.
4/19/2017	7.0	200.0	1.45	N	21	17.5	3.45	0.62	611.5	85.37	98.46	34	17
4/25/2017	0.5	183.0	0.10	N	20	0.5	0.10	0.00	612.0	85.47	97.56	35	27	Rain/snow mix at Maini lodge
Apr. Total	68.5		11.75
5/7/2017	4.0	158.0	0.54	N	14							44	29	Snow began in afternoon of 5/6. Most fell overnight.
5/8/2017	1.5	159.0	0.30	M	20	5.5	0.84	0.00	617.5	86.31	99.40	34	28
5/16/2017	1.5	141.0	0.28	N	18							36	21
5/17/2017	1.0	146.0	0.26	N	26	2.5	0.54	0.00	620.0	86.85	99.94	38	21	Strong surface winds created drifting at base depth sensor
5/31/2017	0.0	102.0	0.21	Y	0	0.0	0.00	0.21	620.0	86.85	100.15	43	34	Rain/Snow mix at top of Ch 3
May Total	8.0		1.59
6/12/2017	1.5	69.0	0.18	N	12	1.5	0.18	0.00	621.5	87.03	100.33
June Total	1.5		0.18
Date	HN24(")	Base Depth	SWE	Rain	% Density	StormSnow "	Storm SWE "	Storm Rain	Season Snow	Season SWE	Season Precip	Base Hi Temp	Base Lo Temp	Notes
Season Totals							87.38		621.5	87.03	100.33			Missed largest snowfall season (2010-2011) 661.5"  but crushed previous total water record (2010-2011) 78.41"
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.
All data subject to revision.