Mammoth Mountain Ski Patrol 2017-18 Storm Summary - Sesame Snow Study Site 9,000' (2,743m)
Last Updated	5/29/18 7:33
Date	HN24(")	Base Depth	SWE	Rain	% Density	StormSnow "	Storm SWE "	Season Snow	Season SWE	Season Precip	Base Hi Temp	Base Lo Temp	Notes
10/20/2017	2.0	2.0	0.46	0.28	23	2.0	0.46	2.0	0.46	0.74	38	29
Oct. Total	2.0
11/6/2017	1.5	3.0	0.52	0.37	35	1.5	0.52	3.5	0.98	1.63	36	26
11/16/2017	7.0	7.0	2.27	1.84	32						37	31	Started snowing pm of 15th
11/17/2017	14.0	20.0	5.20	4.41	37	21.0	7.47	24.5	8.45	15.35	33	30	Most precip fell during ops hrs of 16th.  Perfect base material.  Really let us open terrain
11/27/2017	11.0	24.0	2.22	1.08	20	11.0	2.22	35.5	10.67	18.65	43	24	Rained to at least top of ch1 evening of 11/26
Nov. Total	35.5
12/3/2017	0.5	23.5	0.19		38	0.5	0.19	36.0	10.86	18.84	42	23
12/20/2017	3.5	26.0	0.35		12						41	23	Graupel started around 4am.  Heavy snow showers from 10-12 then cleared and blew upslope
12/21/2017	T	26.0	0.03			3.5	0.38	39.5	11.24	19.22	25	6	Trace overnight from wrap around.  Met one .46 added to season precip.
Dec. Total	4.0
1/4/2018	T	22.0	0.02								37	30
1/5/2018	1.0	24.0	0.14	Y	14	1.0	0.16	40.5	11.40	19.38	36	31	Rained to the Summit.  Left thin rain crust
1/6/2018	6.0	30.0	0.86		14						41	30
1/7/2018	4.5	33.5	0.60		13	10.5	1.46	51.0	12.86	20.84	32	20	Able to open wip outs drop outs and noids from top.  Rocky but open.
1/8/2018	T	33.0	0.02								39	24
1/9/2018	11.0	41.0	1.40	0.09	13						33	30	Schmoo!
1/10/2018	T	41.0	0.05			11.0	1.47	62.0	14.33	22.40	46	36
Date	HN24(")	Base Depth	SWE	Rain	% Density	StormSnow "	Storm SWE "	Season Snow	Season SWE	Season Precip	Base Hi Temp	Base Lo Temp	Notes
1/19/2018	1.0	37.0	0.25	0.02	25						39	25
1/20/2018	3.0	40.0	0.38		8	4.0	0.63	66.0	14.96	23.05	25	9	NE wind
1/25/2018	6.0	43.0	0.65		11						35	19	Great skiing snow.  Not as wind affected as thought to be
1/26/2018	1.0	43.0	0.05		5	7.0	0.70	73.0	15.66	23.75	19	8	Last inch of storm fell during ops hrs of 1/25
Jan Total	33.5
2/12/2018	T	36.5	0.05								37	17
2/13/2018	2.5	36.0	0.20		8	3.0	0.25	76.0	15.91	24.00	20	12
2/19/2018	3.5	38.0	0.10		3						31	4
2/20/2018	T	37.5	0.03								13	-6	Brrrrr.
2/21/2018	1.0	38.0	0.05		5						17	1	2 small systems back to back.  No real day time clearing between.
2/22/2018	2.5	39.5	0.15		1						19	4
2/23/2018	11.0	46.5	0.70		6	18.0	1.03	94.0	16.94	25.03	13	6	Kind pow with limited base.
2/27/2018	6.5	48.0	0.40		6	6.5	0.40	100.5	17.34	25.43	18	8	4" fell during ops hrs on 26th
Feb Total	26.0
Date	HN24(")	Base Depth	SWE	Rain	% Density	StormSnow "	Storm SWE "	Season Snow	Season SWE	Season Precip	Base Hi Temp	Base Lo Temp	Notes
3/1/2018	2.5	47.5	0.23		9						29	10
3/2/2018	25.0	72.0	2.43		11						23	18
3/3/2018	13.0	81.0	1.30		10						21	16	Blower Pow!
3/4/2018	10.0	85.5	0.56		6	50.5	4.52	132.0	21.86	29.95	14	9	Stopped snowing in the evening of 3//3
3/11/2018	Tr	66.0	0.02						21.88	29.97	40	22	Swing and a miss.  Storm tracked south
3/13/2018	Tr	62.0	0.02	0.20							49	29
3/14/2018	8.0	71.0	1.50	0.29	19						33	23
3/15/2018	7.0	76.0	0.65		10						23	14	Great storm other than the rain.
3/16/2018	4.0	76.5	0.40		10
3/17/2018	19.0	89.5	1.58		8	38.0	4.15	170.0	26.03	34.61	20	11	12"/1.03" fell during op hrs 1/15/18
Date	HN24(")	Base Depth	SWE	Rain	% Density	StormSnow "	Storm SWE "	Season Snow	Season SWE	Season Precip	Base Hi Temp	Base Lo Temp	Notes
3/21/2018	7.5	85.0	1.00		13						37	26	3.0"/.30" of H2o fell during ops hrs 3/20/18
3/22/2018	25.0	104.5	3.30	Y	13						33	30	Rain snow mix.  3"/.8" fell during ops 3/21. Rest was overnight
3/23/2018	21.0	115.5	3.30	Y	16	53.5	7.60	223.5	33.63	42.21	32	20	Rain snow mix.  15"/2.4" fell during ops hrs 3/22.  Rest overnight
March Total	142.0
4/6/2018	0.5	80.0	0.10	0.20	20						48	31	Little snow overnight before turning to rain.
4/7/2018		76.5		1.30							41	33	Rain
4/8/2018		75.0		1.40		0.5		224.0	33.73	45.21	42	27	Rain
4/16/2018	2.0	70.0	0.25		13						44	19	Met .4
4/17/2018	3.5	73.0	0.30		9	5.5	0.55	229.5	34.28	45.76	21	5	Met.42
4/19/2018	1.0	70.0	0.06		6	1.0	0.06	230.5	34.34	45.82	34	18
April Total	7.0
Date	HN24(")	Base Depth	SWE	Rain	% Density	StormSnow "	Storm SWE "	Season Snow	Season SWE	Season Precip	Base Hi Temp	Base Lo Temp	Notes
5/1/2018	1.5	49.5	0.12		8
5/2/2018	T	48.0	0.03			1.5	0.15	231.5	34.49	45.97	39	25
5/12/2018	1.5	21.0	0.18		12	1.5	0.18	232.5	34.67	46.15	45	20	graupel start/fluff finish
5/14/2018	T	17.5		0.12							45	31
5/15/2018	0.5	15.0	0.07	0.15	14	0.5	0.07	233.0	34.74	46.49	48	31
5/21/2018	0.5	1.0	0.09	0.19	18						52	32
5/22/2018	T	0.0		0.39							46	34
5/23/2018				0.50		0.5	0.09	233.5	34.83	47.66	53	37
Date	HN24(")	Base Depth	SWE	Rain	% Density	StormSnow "	Storm SWE "	Season Snow	Season SWE	Season Precip	Base Hi Temp	Base Lo Temp	Notes
5/25/2018	T			0.20							55	36
5/26/2018	T		0.02								39	28
5/27/2018	0.5	0.5	0.18			0.5	0.20	234.0	35.03	48.06	43	31
May Total	4.5			1.55			0.69			2.24 May
								234.0	35.03	48.06
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.