Storm Summary of 2005-2006 Winter Season (November - March) - 58 Storms

Surface Observations from Portland International Airport Weather Station, Oregon (4535'N , 12236'W / Elevation: 5.8 m)

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 Summary
Rain
Virga to Rain
Rain to Virga
Rain/Snow
Virga to Rain to Virga
Rain to Virga to Rain
Virga
Continuity
Continuous
Scattered
Average
All
Img.
Temp. (°C)
7.38
RH (%)
80.0
Wind Direction
161°
Wind Speed (m/s)
9.9
Pressure (hPa)
1014
Precipitation (in)
0.70
AGL
Tall
Tall to Borderline
Tall to Shallow
Borderline
Borderline to Shallow
Borderline to Tall
Borderline to Tall to Borderline
Shallow
Shallow to Borderline to Shallow
Shallow to Tall to Borderline
Total Precipitation (in.)
32.08
Avg. Duration (hrs)
26.84
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
2005
11
24
Virga to Rain
Tall to Borderline
Scattered
19:00
46
5.1
S
SE
7.3
1.39
increasing
up - down
decreasing
up - down
decreasing
down - up
2005
11
26
Rain to Virga to Rain
Borderline to Tall to Borderline
Scattered
23:30
14.5
4.6
SE
SW
6.6
0.05
increasing
decreasing
decreasing
increasing
increasing
down - up
2005
11
28
Virga to Rain
Borderline to Tall
Scattered
19:00
29
4.9
S
S
15.6
0.34
increasing
down - up
decreasing
increasing
decreasing
down - up
2005
12
1
Virga to Rain
Tall to Shallow
Scattered
08:00
72
4.4
S
S
10.8
1.43
decreasing
down - up
increasing
flat
decreasing
increasing
2005
12
13
Rain
Shallow
Continuous
01:00
1.5
2.8
E
E
2.3
trace
increasing
decreasing
decreasing
increasing
down - up
increasing
2005
12
18
Rain/Snow
Tall
Scattered
21:00
32
0.9
E
E
22.3
0.31
increasing
down - up
flat
down - up
decreasing
increasing
2005
12
20
Rain
Tall
Scattered
11:00
58
4.7
SE
E
15.1
2.49
increasing
increasing
decreasing
increasing
decreasing
up - down
2005
12
23
Rain
Borderline
Scattered
7:00
1.5
11.5
S
S
2.8
none
increasing
increasing
decreasing
decreasing
increasing
increasing
2005
12
23
Virga to Rain
Tall
Scattered
16:30
9.5
8.6
SE
SE
10.7
0.05
decreasing
increasing
up - down
down - up
increasing
decreasing
2005
12
25
Rain
Tall
Scattered
01:00
68
9.6
SE
E
12.5
0.90
up - down
up - down
decreasing
down - up
decreasing
down - up
2005
12
28
Virga to Rain
Tall to Shallow
Scattered
02:30
36.5
8.6
SE
SE
11.5
1.79
decreasing
up - down
flat
down - up
decreasing
down - up
2005
12
30
Rain
Tall
Scattered
0:00
35
6.1
SE
SE
14.8
2.60
up - down
down - up
decreasing
increasing
decreasing
decreasing
2005
12
31
Rain
Tall to Borderline
Scattered
19:00
51
8.0
SE
E
10.7
0.52
decreasing
up - down
increasing
down - up
increasing
increasing
2006
01
03
Virga to Rain
Borderline to Shallow
Continuous
16:30
11.5
6.6
SE
SE
13.1
0.36
increasing
increasing
decreasing
increasing
decreasing
increasing
2006
01
04
Virga
Borderline
Scattered
22:30
3.5
8.9
SE
SE
15.6
--
increasing
flat
decreasing
up - down
decreasing
decreasing
2006
01
05
Rain
Tall
Scattered
20:30
51
7.9
SE
E
10.9
2.62
decreasing
up - down
flat
up - down
up - down
down - up
2006
01
08
Rain
Borderline to Tall
Scattered
16:30
87
9.4
S
SW
11.7
3.11
flat
up - down
increasing
down - up
increasing
down - up
2006
01
12
Rain
Tall to Shallow to Borderline
Scattered
13:00
60.5
7.1
SE
SE
9.5
1.26
decreasing
up - down
flat
decreasing
up - down
decreasing
2006
01
15
Rain
Borderline to Tall to Borderline
Scattered
07:00
18
4.8
S
SE
6.2
0.07
increasing
decreasing
increasing
decreasing
increasing
increasing
2006
01
16
Virga to Rain
Tall
Scattered
06:30
41.5
7.0
SE
SE
12.3
1.66
decreasing
up - down
down - up
down - up
flat
decreasing
2006
01
18
Rain to Virga
Borderline to Tall to Borderline
Scattered
07:00
10
6.5
SE
SE
7.4
0.18
down - up
increasing
increasing
up - down
flat
decreasing
2006
01
19
Rain
Shallow to Tall to Borderline
Scattered
07:30
41
7.7
S
S
8.3
0.57
decreasing
up - down
increasing
flat
increasing
down - up
2006
01
21
Virga to Rain
Shallow to Borderline to Shallow
Scattered
13:30
11
7.5
S
S
7.1
0.06
flat
increasing
increasing
flat
increasing
increasing
2006
01
22
Virga
Tall
Scattered
16:00
1
6.1
S
S
3.0
--
flat
flat
increasing
flat
increasing
increasing
2006
01
25
Rain
Shallow to Borderline to Shallow
Scattered
18:00
16
6.9
S
SE
9.7
0.23
flat
flat
increasing
up - down
increasing
increasing
2006
01
26
Rain
Borderline to Tall to Borderline
Scattered
17:00
59.5
7.0
S
SE
13.5
1.16
flat
increasing
decreasing
flat
flat
down - up
2006
01
29
Rain
Borderline to Tall to Borderline
Scattered
11:00
38
9.5
S
E
14.2
1.93
flat
increasing
flat
decreasing
increasing
down - up
2006
01
31
Virga to Rain
Tall to Shallow
Continuous
18:00
12
7.0
S
SE
16.8
0.60
flat
down - up
decreasing
increasing
decreasing
decreasing
2006
02
01
Rain
Shallow
Scattered
14:30
1.5
8.9
S
S
14.0
none
increasing
flat
decreasing
flat
increasing
increasing
2006
02
02
Rain
Shallow to Tall to Borderline
Scattered
03:00
21.5
10.2
S
S
9.8
0.39
up - down
down - up
down - up
increasing
decreasing
increasing
2006
02
03
Rain
Tall to Shallow
Scattered
15:00
39
8.5
S
S
13.6
0.60
flat
up - down
flat
decreasing
up - down
down - up
2006
02
08
Virga to Rain to Virga
Borderline
Scattered
12:30
6
7.0
SW
SE
3.9
none
decreasing
flat
increasing
flat
increasing
increasing
2006
02
12
Virga to Rain to Virga
Shallow to Borderline to Shallow
Scattered
08:00
5
6.4
SE
SE
9.0
none
decreasing
flat
increasing
down - up
increasing
increasing
2006
02
13
Rain
Borderline to Shallow
Scattered
13:00
8
6.2
SE
SE
2.4
0.07
down - up
increasing
up - down
up - down
decreasing
up - down
2006
02
14
Rain to Virga
Borderline to Tall
Scattered
11:30
14
3.9
SW
SW
3.8
0.12
down - up
increasing
increasing
up - down
decreasing
decreasing
2006
02
21
Virga to Rain
Shallow
Scattered
00:00
40
4.3
SW
NE
2.4
0.08
increasing
increasing
down - up
increasing
decreasing
down - up
2006
02
23
Rain
Borderline to Tall to Borderline
Scattered
04:30
24
7.9
SW
NW
9.4
0.09
flat
up - down
flat
down - up
decreasing
down - up
2006
02
26
Virga
Tall
Scattered
07:00
2
6.5
E
E
8.0
--
decreasing
decreasing
increasing
up - down
decreasing
decreasing
2006
02
26
Virga to Rain
Tall to Borderline
Scattered
17:30
87
6.8
S
SW
7.8
1.21
decreasing
down - up
decreasing
increasing
decreasing
down - up
2006
03
02
Virga to Rain
Tall to Borderline
Scattered
03:00
17
9.3
SE
E
18.2
none
flat
decreasing
flat
increasing
decreasing
increasing
2006
03
04
Virga to Rain
Borderline to Shallow
Scattered
00:00
12
8.6
S
S
13.0
0.01
up - down
decreasing
down - up
increasing
down - up
increasing
2006
03
05
Virga to Rain to Virga
Borderline to Tall to Borderline
Continuous
08:00
17
9.1
E
SE
14.6
0.21
down - up
down - up
up - down
up - down
decreasing
decreasing
2006
03
06
Virga to Rain
Borderline to Tall
Scattered
07:30
42
8.6
S
SW
10.6
0.23
decreasing
up - down
increasing
increasing
decreasing
increasing
2006
03
08
Rain
Borderline to Tall to Borderline
Scattered
11:00
46
3.6
S
SW
11.5
1.35
down - up
up - down
up - down
increasing
up - down
decreasing
2006
03
10
Rain
Shallow to Tall to Borderline
Scattered
15:00
10.5
4.0
SE
E
11.6
0.06
flat
increasing
down - up
decreasing
decreasing
increasing
2006
03
11
Rain
Shallow to Tall to Shallow
Scattered
21:30
20
3.9
SW
NW
4.0
0.25
increasing
down - up
decreasing
increasing
increasing
increasing
2006
03
13
Virga to Rain
Borderline
Scattered
22:30
7
8.9
SE
SE
15.3
0.01
increasing
decreasing
decreasing
increasing
decreasing
decreasing
2006
03
14
Rain
Borderline to Tall to Borderline
Scattered
14:00
15
6.7
SE
SW
7.2
0.12
increasing
down - up
increasing
down - up
flat
increasing
2006
03
15
Rain to Virga to Rain
Borderline
Scattered
14:00
5.5
6.4
SE
E
13.9
0.03
down - up
increasing
flat
decreasing
down - up
increasing
2006
03
16
Rain
Borderline to Tall to Shallow
Scattered
04:00
54
7.3
S
SE
10.7
0.58
up - down
up - down
down - up
decreasing
decreasing
down - up
2006
03
19
Drizzle
Shallow
Continuous
00:30
0.5
10.0
W
W
3.0
none
decreasing
flat
decreasing
increasing
decreasing
decreasing
2006
03
21
Rain to Virga
Borderline
Scattered
04:00
52
9.2
SE
SE
8.5
0.19
decreasing
down - up
down - up
up - down
down - up
increasing
2006
03
23
Virga to Rain
Tall to Shallow
Scattered
18:00
36
11.4
S
SE
10.5
0.28
increasing
decreasing
decreasing
increasing
decreasing
down - up
2006
03
25
Virga to Rain to Virga
Borderline to Tall to Borderline
Scattered
18:00
8
8.3
W
SW
6.7
0.21
flat
up - down
up - down
flat
decreasing
increasing
2006
03
28
Rain
Tall
Scattered
04:30
9
12.5
SE
S
12.1
none
decreasing
decreasing
flat
increasing
decreasing
increasing
2006
03
29
Virga to Rain
Tall to Shallow
Scattered
00:00
7
15.4
SE
NW
6.8
none
increasing
decreasing
decreasing
increasing
decreasing
down - up
2006
03
29
Rain
Shallow to Borderline to Shallow
Scattered
14:30
17.5
8.6
SE
E
6.1
0.15
decreasing
up - down
up - down
increasing
increasing
increasing
2006
03
30
Rain
Shallow to Borderline to Shallow
Scattered
17:30
17
10.1
SE
W
5.7
0.16
increasing
up - down
decreasing
down - up
flat
decreasing

Version 2, 26 July 2013

web page credits: Micheal Tai Bryant, Spencer Rhodes, 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-0544766 and ATM-0908420
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