Alta Website (2011-2012)

Storm Types

Storm Continuity

Storm Summary of 2011-2012 Winter Season (November - March) - 54 Storms

Alta, Utah

Highlighted rows:

Blue = Snow, Freezing Rain, Sleet, or Mixed
Grey = Virga, Mix of Virga and Rain; No Icy Precipitation
White = Rain only

* = general trend 6 hours before storm
Tall	(> 4.0 km AGL)	Continuity for Storm Maturity
Borderline	( 2.5-4.0 km AGL)	Scattered: Several Breaks
Shallow	(< 2.5 km AGL)

													Trends
								Wind Direction		Wind Speed (m/s)			Temperature		RH
Year	Month	Day	Type	Continuity	Start Time (UTC)	Duration (hrs)	Avg. Temp. (°C)	Avg.	At Storm Maturity	Alta Base	Wildcat Lift	Precip. (mm)	before*	during	before*	during
2011	11	12	Virga to Mixed to Snow	Continuous	03:55	23.8	-1.7	NW	Unknown	3.8	2.9	12.32	--	down - up	--	increasing
2011	11	13	Snow	Continuous	03:41	18.4	-1.9	NW	NW	5.2	2.6	15.75	down - up	increasing	flat	down - up
2011	11	18	Virga to Mixed to Snow	Scattered	12:54	21.2	-1.9	NW	NW	3.3	3.7	14.22	decreasing	decreasing	increasing	increasing
2011	11	21	Mixed to Snow to Mixed	Scattered	01:11	23.2	-0.7	NW	NW	1.7	2.0	none	up - down	down - up	down - up	increasing
2011	11	25	Virga to Mixed	Scattered	06:50	15.9	-2.1	NW	NW	3.7	2.3	0.25	decreasing	up - down	increasing	up - down
2011	11	30	Snow to Virga to Snow	Scattered	20:15	15.5	-4.9	SE	SE	3.9	6.3	0.76	up - down	decreasing	increasing	decreasing
2011	12	04	Snow	Scattered	12:52	13.6	-10.1	N	S	1.8	2.2	1.78	increasing	up - down	decreasing	up - down
2011	12	12	Snow	Scattered	19:36	10.4	-2.6	SE	W	1.5	2.9	0.25	increasing	decreasing	decreasing	increasing
2011	12	13	Snow	Scattered	06:02	19.5	-3.3	S	SW	1.1	2.7	6.60	decreasing	up - down	increasing	down - up
2011	12	14	Snow	Scattered	08:45	15.5	-6.0	W	W	1.7	1.7	1.78	down - up	up - down	down - up	decreasing
2011	12	21	Snow	Scattered	14:21	23.5	-10.0	W	NW	4.1	5.1	4.83	down - up	decreasing	up - down	up - down
2011	12	28	Virga to Rain to Virga	Scattered	12:39	2.3	0.5	NW	W	3.6	2.5	none	increasing	increasing	decreasing	increasing
2011	12	29	Rain to Virga to Snow	Scattered	05:41	21.9	2.4	NW	NW	4.1	3.2	6.60	increasing	decreasing	decreasing	up - down
2011	12	31	Rain to Virga to Snow	Scattered	05:00	12.6	-5.1	NW	NW	5.3	4.8	2.79	up - down	decreasing	increasing	increasing
2012	01	07	Virga to Snow	Scattered	02:07	21.0	-4.5	W	NW	2.1	2.3	9.40	decreasing	up - down	increasing	increasing
2012	01	18	Virga	Scattered	02:24	15.0	-5.3	NW	NW	5.2	3.7	none	down - up	increasing	decreasing	increasing
2012	01	18	Virga to Snow	Continuous	17:24	21.7	-1.4	NW	W	4.4	3.4	36.07	increasing	down - up	increasing	increasing
2012	01	19	Rain	Continuous	15:04	4.2	0.9	NW	NW	3.5	3.8	4.06	increasing	increasing	flat	decreasing
2012	01	19	Rain to Snow	Continuous	19:17	16.7	-0.6	NW	NW	3.4	3.2	5.59	increasing	decreasing	flat	down - up
2012	01	20	Snow	Scattered	11:57	7.5	-1.6	NW	NW	5.1	3.6	1.27	decreasing	increasing	increasing	decreasing
2012	01	21	Mixed to Rain	Continuous	03:37	9.3	0.4	SW	NW	2.7	2.9	1.78	down - up	increasing	up - down	down - up
2012	01	21	Rain to Snow	Continuous	12:57	28.1	-4.1	NW	NW	4.4	4.1	37.08	down - up	decreasing	up - down	increasing
2012	01	23	Virga to Snow	Scattered	01:52	15.6	-7.5	E	SE	1.5	2.4	2.03	decreasing	increasing	decreasing	increasing
2012	01	23	Snow	Continuous	17:27	17.2	-3.6	NW	SE	1.9	2.1	6.35	increasing	decreasing	increasing	up - down
2012	01	26	Rain to Snow	Scattered	18:36	21.1	-2.8	W	NW	3.2	2.5	23.37	increasing	decreasing	decreasing	up - down
2012	01	30	Virga to Mixed	Scattered	13:26	4.9	-2.2	N	NW	2.6	2.5	0.25	increasing	increasing	decreasing	down - up
2012	02	08	Virga to Mixed to Snow	Scattered	11:23	23.3	-3.2	W	W	1.5	1.8	3.05	increasing	up - down	increasing	increasing
2012	02	09	Snow to Virga	Scattered	10:43	13.8	-3.6	W	NW	1.7	2.4	1.52	increasing	down - up	down - up	down - up
2012	02	12	Virga to Snow	Continuous	04:03	3.7	-1.7	E	W	1.1	2.8	0.25	decreasing	decreasing	increasing	increasing
2012	02	12	Snow to Mixed to Snow	Continuous	07:44	23.1	-2.5	W	NW	1.5	1.6	25.65	decreasing	up - down	increasing	down - up
2012	02	13	Snow to Mixed to Snow	Scattered	06:49	23.2	-3.7	NW	NW	1.8	2.0	3.56	decreasing	up - down	flat	down - up
2012	02	14	Snow	Scattered	17:43	16.3	-6.5	S	NW	1.7	1.6	1.02	increasing	decreasing	decreasing	increasing
2012	02	15	Snow to Virga to Snow	Scattered	10:02	19.3	-5.3	E	NE	1.2	2.1	1.52	up - down	up - down	up - down	down - up
2012	02	19	Snow	Scattered	02:58	24.0	-7.3	W	W	1.8	1.9	7.87	decreasing	decreasing	increasing	up - down
2012	02	20	Snow	Continuous	22:17	24.0	-5.1	NW	NW	3.8	2.7	3.56	up - down	down - up	decreasing	increasing
2012	02	21	Virga to Rain to Snow	Continuous	22:17	13.0	-1.1	NW	NW	3.6	2.5	14.48	increasing	increasing	down - up	increasing
2012	02	22	Virga to Rain to Mixed	Scattered	22:07	13.3	-0.5	NW	NW	5.5	3.5	21.34	increasing	decreasing	decreasing	increasing
2012	02	23	Snow	Scattered	11:22	13.7	-8.6	W	NW	2.7	3.0	9.40	decreasing	up - down	up - down	decreasing
2012	02	25	Snow	Scattered	16:09	18.9	-9.4	NW	NW	4.5	3.5	2.54	decreasing	decreasing	increasing	increasing
2012	02	29	Virga to Snow to Virga	Continuous	09:58	12.3	-4.8	NW	NW	2.5	4.1	1.52	increasing	increasing	increasing	decreasing
2012	02	29	Snow	Scattered	22:16	23.6	-8.2	NW	NW	2.7	2.6	11.68	increasing	down - up	decreasing	up - down
2012	03	01	Snow	Scattered	22:40	24.3	-9.5	W	NW	2.5	2.4	18.03	increasing	down - up	down - up	up - down
2012	03	02	Snow	Scattered	22:56	17.5	-10.1	W	NW	3.3	2.3	1.27	up - down	down - up	decreasing	up - down
2012	03	06	Virga to Snow	Scattered	15:02	16.0	-1.7	E	SE	2.4	3.4	1.02	decreasing	decreasing	up - down	increasing
2012	03	14	Virga	Continuous	00:00	17.3	4.0	W	NW	2.2	3.6	none	up - down	down - up	decreasing	up - down
2012	03	14	Virga	Scattered	17:20	13.4	5.1	NE	NW	2.2	3.1	none	increasing	up - down	decreasing	increasing
2012	03	16	Virga to Rain to Virga	Scattered	20:48	22.4	5.6	SE	S	2.4	3.5	3.30	increasing	decreasing	down - up	up - down
2012	03	17	Rain to Snow	Continuous	19:13	21.6	0.4	NW	N	1.7	2.1	36.32	down - up	decreasing	down - up	increasing
2012	03	18	Snow	Continuous	16:49	6.5	-2.4	NW	NW	2.2	2.2	6.35	decreasing	up - down	up - down	decreasing
2012	03	18	Snow	Continuous	23:17	23.4	-6.0	NW	NW	3.0	2.7	17.02	up - down	down - up	down - up	up - down
2012	03	19	Snow	Scattered	22:39	11.7	-7.6	NW	NW	1.5	1.1	7.87	increasing	decreasing	decreasing	increasing
2012	03	26	Virga to Mixed to Virga	Scattered	11:15	19.8	-1.5	NW	W	2.6	3.3	14.22	decreasing	decreasing	increasing	up - down
2012	03	28	Rain to Virga to Rain	Continuous	21:07	10.5	3.8	NW	NW	1.9	2.6	5.08	increasing	decreasing	down - up	increasing
2012	03	29	Virga to Rain to Virga	Continuous	19:23	5.2	6.3	NW	NW	2.1	3.1	none	increasing	decreasing	decreasing	increasing

Version 2 (Alta), 21 May 2014

web page credits: Spencer Rhodes, Michael Tai Bryant, Sandra Yuter

Department of Marine, Earth, and Atmospheric Sciences, North Carolina State University

This material is based upon work supported by the National Science Foundation under Grant No. AGS-1127759
Any opinions, findings, and conclusions or recommendations expressed in this material are those of the author(s)
and do not necessarily reflect the view of the National Science Foundation (NSF).

contacts:
Dr. Sandra Yuter seyuter@ncsu.edu