Storm Summary of 2010-2011 Winter Season (November - March) - 70 storms

Surface Observations from ncdc.noaa.gov (USAF: 726836) Merwin, Washington

Blue highlighted rows: Snow, freezing rain, or mixed cases

Grey highlighted rows: Virga or mix of virga and rain, no snow

* = 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)  
Storm Types

Storm Continuity


Trends
Wind Direction
Temperature
RH
Pressure
Year
Month
Day
Type
AGL
Continuity
Start Time (UTC)
Duration (hrs)
Avg. Temp. (°C)
Avg.
At Storm Maturity
Wind Speed (m/s)
Precip. (in)
before*
during
before*
during
before*
during
2010
11
22
Snow
Borderline to Shallow
Continuous
14:36
14.2
1.7
SW
NE
4.1
0.45
decreasing
up - down
flat
down - up
increasing
decreasing
2010
11
26
Rain
Borderline to Shallow
Scattered
10:00
21.6
4.1
S
E
2.7
0.24
flat
up - down
decreasing
increasing
decreasing
decreasing
2010
11
27
Light Rain
Shallow
Scattered
07:36
12.9
3.7
S
SE
1.2
0.01
decreasing
down - up
down - up
decreasing
decreasing
down - up
2010
11
28
Rain
Borderline to Shallow
Continuous
06:10
2.4
0.7
No wind
No wind
0.0
0.02
down - up
increasing
increasing
flat
increasing
increasing
2010
11
30
Rain
Borderline
Continuous
01:00
23.5
3.9
S
SE
5.0
1.36
up - down
down - up
down - up
increasing
decreasing
decreasing
2010
12
01
Rain
Shallow
Scattered
00:32
10.2
7.3
S
S
0.8
0.12
increasing
up - down
flat
down - up
decreasing
increasing
2010
12
06
Light Rain
Borderline
Continuous
12:25
3.5
3.3
SW
S
6.3
0.03
down - up
flat
decreasing
up - down
down - up
increasing
2010
12
07
Light Rain
Shallow to Borderline
Continuous
08:21
3.8
5.7
SW
SW
1.5
0.04
flat
decreasing
increasing
up - down
flat
decreasing
2010
12
07
Rain
Borderline
Scattered
20:53
21.6
5.1
S
E
3.0
0.87
increasing
down - up
decreasing
up - down
decreasing
down - up
2010
12
08
Rain
Shallow to Borderline
Scattered
18:27
17.8
9.2
SE
E
4.8
0.67
increasing
down - up
decreasing
increasing
increasing
flat
2010
12
09
Rain
Shallow to Borderline
Scattered
12:13
16.8
8.8
SE
E
4.5
0.99
increasing
up - down
flat
flat
flat
down - up
2010
12
10
Virga to Rain
Borderline to Shallow
Continuous
10:48
8.1
4.7
E
E
0.4
0.27
decreasing
increasing
flat
flat
increasing
increasing
2010
12
11
Rain
Borderline to Shallow
Continuous
13:31
13.2
5.3
S
S
3.3
1.04
flat
increasing
flat
flat
decreasing
decreasing
2010
12
12
Rain
Borderline to Shallow
Scattered
16:55
17.5
12.4
SE
SE
6.0
0.28
flat
decreasing
decreasing
increasing
flat
decreasing
2010
12
14
Rain
Shallow to Borderline
Scattered
00:19
13.8
9.5
S
E
5.4
0.34
up - down
decreasing
down - up
up - down
decreasing
down - up
2010
12
14
Rain
Borderline to Shallow
Scattered
14:09
22.1
5.1
S
SE
3.5
0.54
decreasing
up - down
up - down
down - up
increasing
increasing
2010
12
15
Rain
Shallow
Scattered
12:16
20.0
5.7
S
SE
4.7
0.09
increasing
up - down
decreasing
down - up
increasing
increasing
2010
12
18
Rain
Borderline to Shallow
Scattered
08:27
13.1
4.1
SE
E
9.5
0.33
increasing
down - up
decreasing
up - down
decreasing
down - up
2010
12
19
Rain to Virga
Shallow
Scattered
05:24
7.2
2.9
S
S
4.0
0.15
decreasing
flat
flat
up - down
up - down
flat
2010
12
20
Rain
Borderline to Shallow
Scattered
00:14
22.3
2.5
S
SE
4.5
0.95
up - down
down - up
down - up
up - down
decreasing
increasing
2010
12
20
Rain
Shallow
Scattered
22:30
12.4
3.5
S
S
3.6
0.17
flat
flat
up - down
down - up
increasing
increasing
2010
12
21
Virga
Borderline
Scattered
18:29
7.6
5.3
S
S
0.3
trace
increasing
up - down
decreasing
down - up
flat
decreasing
2010
12
22
Light Rain
Shallow
Scattered
09:02
13.1
5.1
SE
SE
3.5
0.02
flat
down - up
flat
increasing
increasing
increasing
2010
12
24
Virga to Rain
Borderline
Scattered
14:00
23.0
5.7
S
SE
3.2
0.17
flat
up - down
flat
increasing
flat
decreasing
2010
12
26
Rain
Borderline to Shallow
Scattered
15:04
21.9
4.6
S
E
6.0
0.49
decreasing
up - down
flat
increasing
decreasing
increasing
2010
12
27
Virga to Rain
Borderline to Shallow
Continuous
18:53
22.2
7.4
SE
SE
6.1
1.07
increasing
up - down
decreasing
increasing
flat
decreasing
2010
12
28
Rain
Borderline to Shallow
Scattered
17:04
23.5
4.3
NW
E
4.0
0.86
flat
decreasing
flat
down - up
decreasing
down - up
2011
01
05
Mixed
Borderline to Shallow
Continuous
10:50
20.6
1.0
SW
SW
0.2
0.29
flat
increasing
flat
increasing
increasing
up - down
2011
01
06
Rain
Shallow
Scattered
13:53
10.2
4.3
No wind
No wind
0.0
0.04
flat
up - down
flat
flat
decreasing
up - down
2011
01
07
Rain
Borderline to Shallow
Scattered
17:33
6.5
6.3
SE
SE
3.4
0.05
increasing
up - down
flat
down - up
decreasing
down - up
2011
01
09
Mixed
Shallow
Scattered
07:00
9.5
-0.2
No wind
No wind
0.0
0.02
decreasing
flat
flat
flat
decreasing
flat
2011
01
10
Rain to Virga
Shallow
Scattered
12:54
4.6
1.2
S
S
0.4
0.03
flat
increasing
flat
decreasing
increasing
increasing
2011
01
11
Mixed
Shallow to Borderline
Scattered
20:08
8.2
0.7
S
SE
3.3
trace
increasing
decreasing
decreasing
increasing
decreasing
decreasing
2011
01
12
Mixed
Shallow to Borderline
Continuous
04:17
20.7
1.0
S
S
2.7
0.97
decreasing
increasing
increasing
increasing
decreasing
down - up
2011
01
13
Rain
Borderline
Scattered
01:01
11.9
6.8
W
SE
2.3
0.84
increasing
increasing
flat
flat
increasing
decreasing
2011
01
13
Rain
Shallow
Scattered
19:00
8.4
12.4
S
SE
6.7
0.07
increasing
up - down
decreasing
down - up
down - up
increasing
2011
01
14
Virga to Rain
Borderline to Shallow
Scattered
11:46
10.2
10.9
SE
SE
6.9
0.02
flat
increasing
flat
decreasing
increasing
flat
2011
01
15
Virga to Rain
Tall to Borderline
Continuous
11:29
21.9
11.5
S
SE
3.0
0.86
decreasing
down - up
increasing
up - down
flat
decreasing
2011
01
16
Rain
Borderline to Shallow
Scattered
09:23
21.3
12.8
SE
SE
4.8
0.43
flat
up - down
decreasing
up - down
flat
down - up
2011
01
17
Rain to Virga to Rain
Shallow
Scattered
06:40
13.7
10.7
S
E
3.8
0.10
decreasing
down - up
decreasing
down - up
increasing
increasing
2011
01
18
Rain
Borderline to Shallow
Continuous
16:12
10.5
5.5
N
N
2.6
0.32
increasing
up - down
flat
down - up
decreasing
decreasing
2011
01
20
Rain
Shallow
Scattered
19:23
13.2
3.7
E
E
1.5
0.04
increasing
increasing
decreasing
increasing
flat
decreasing
2011
01
21
Rain
Shallow to Borderline
Continuous
08:37
13.7
4.7
SE
E
0.8
0.46
flat
increasing
increasing
up - down
decreasing
decreasing
2011
01
24
Virga/Drizzle
Borderline
Scattered
17:54
3.5
5.4
E
E
0.8
trace
down - up
increasing
flat
decreasing
decreasing
flat
2011
01
29
Virga
Borderline
Continuous
10:31
5.3
8.4
SE
SE
3.4
none
down - up
flat
flat
flat
increasing
decreasing
2011
02
04
Virga to Rain
Shallow
Scattered
19:43
4.7
7.8
N
N
1.2
0.03
increasing
flat
decreasing
increasing
decreasing
decreasing
2011
02
06
Rain
Borderline to Shallow
Scattered
21:37
20.7
8.6
SW
SE
4.6
0.15
increasing
down - up
decreasing
up - down
decreasing
down - up
2011
02
07
Light Rain
Shallow
Scattered
18:17
11.1
7.2
W
SW
6.1
0.03
down - up
up - down
decreasing
down - up
increasing
down - up
2011
02
12
Rain
Shallow to Borderline to Shallow
Continuous
23:38
6.4
9.2
S
S
4.9
0.47
increasing
decreasing
decreasing
increasing
decreasing
increasing
2011
02
13
Rain
Shallow to Borderline
Continuous
22:19
5.7
8.3
E
E
0.6
0.17
increasing
decreasing
decreasing
increasing
decreasing
decreasing
2011
02
14
Virga to Rain
Borderline
Scattered
14:53
20.7
6.8
S
E
6.0
0.74
increasing
up - down
flat
down - up
decreasing
down - up
2011
02
15
Rain
Borderline to Shallow
Scattered
11:32
18.7
4.7
S
SE
5.9
0.56
decreasing
up - down
decreasing
up - down
up - down
down - up
2011
02
16
Rain
Shallow to Borderline
Scattered
13:53
10.1
3.6
S
SE
4.4
0.13
decreasing
down - up
increasing
decreasing
decreasing
increasing
2011
02
17
Virga
Shallow
Scattered
10:06
3.8
2.9
SE
SE
5.3
none
increasing
flat
decreasing
decreasing
increasing
flat
2011
02
18
Virga to Rain
Shallow
Scattered
07:41
18.8
2.6
SE
E
3.2
0.39
decreasing
up - down
increasing
decreasing
down - up
increasing
2011
02
24
Mixed
Shallow to Borderline to Shallow
Scattered
15:16
13.5
1.3
SE
E
3.5
0.05
flat
up - down
flat
down - up
flat
increasing
2011
03
08
Rain
Shallow
Scattered
02:51
13.0
5.5
SE
SE
5.8
0.25
up - down
decreasing
down - up
increasing
flat
down - up
2011
03
09
Rain
Borderline to Tall to Shallow
Scattered
04:21
18.8
10.0
S
SE
7.0
0.61
decreasing
increasing
increasing
up - down
flat
down - up
2011
03
09
Rain
Shallow to Borderline
Scattered
23:08
22.2
9.5
S
SE
8.6
1.14
increasing
down - up
down - up
up - down
flat
down - up
2011
03
10
Rain to Virga
Shallow
Scattered
21:21
21.0
5.1
SW
SE
3.5
0.06
increasing
down - up
decreasing
up - down
flat
increasing
2011
03
12
Rain to Drizzle
Borderline to Shallow
Scattered
13:26
17.5
7.7
S
SE
3.4
0.36
decreasing
up - down
flat
increasing
decreasing
increasing
2011
03
13
Virga to Rain
Shallow to Borderline to Tall
Continuous
06:57
21.1
8.0
S
SE
5.9
0.91
decreasing
up - down
increasing
up - down
flat
down - up
2011
03
14
Rain
Shallow
Scattered
04:04
16.3
7.9
SE
SE
9.1
0.44
decreasing
down - up
flat
up - down
increasing
increasing
2011
03
14
Drizzle to Rain
Shallow to Borderline to Shallow
Scattered
20:21
17.8
9.2
S
E
5.2
0.39
increasing
down - up
decreasing
increasing
up - down
decreasing
2011
03
15
Rain
Borderline
Scattered
14:07
17.4
8.7
S
E
8.7
0.23
increasing
up - down
decreasing
down - up
decreasing
down - up
2011
03
16
Light Rain
Borderline
Scattered
08:00
14.0
5.8
S
SE
4.1
0.03
flat
down - up
up - down
up - down
increasing
increasing
2011
03
16
Virga to Rain
Borderline to Shallow
Scattered
22:00
14.0
5.3
S
SE
5.3
0.07
increasing
decreasing
decreasing
increasing
increasing
increasing
2011
03
17
Rain
Shallow
Scattered
13:00
14.5
6.1
SE
E
5.1
0.14
decreasing
up - down
flat
down - up
flat
decreasing
2011
03
18
Rain to Virga
Shallow
Scattered
03:31
21.6
5.5
SE
E
3.4
0.13
decreasing
increasing
increasing
decreasing
decreasing
decreasing
2011
03
19
Rain
Shallow
Scattered
01:04
7.2
4.9
S
S
1.6
0.07
increasing
decreasing
decreasing
up - down
decreasing
up - down

Version 1, Lake Merwin

web page credits: Spencer Rhodes, Micheal 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. ATM-09208420
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