Storm Summary of 2006-2007 Winter Season (November - March) - 77 Storms

Surface Observations from Portland International Airport Weather Station, Oregon (45°35'N , 122°36'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
Freezing Rain/Snow
Virga to Rain to Virga
Rain to Virga to Rain
Virga
Unknown
Continuity
Continuous
Scattered
Average
All
Img.
Temp. (°C)
7.28
RH (%)
78.8
Wind Direction
165°
Wind Speed (m/s)
8.6
Pressure (hPa)
1019
Precipitation (in)
0.59
Total Precipitation (in.)
35.26
AGL
Tall
Tall to Borderline
Tall to Borderline to Tall
Tall to Shallow to Borderline / Tall
Tall to Shallow
Borderline
Borderline to Shallow
Borderline to Tall to Shallow
Borderline to Tall to Borderline
Shallow
Shallow to Borderline to (Shallow)
Shallow to Tall to Shallow
Shallow to Tall to Borderline
Avg. Duration (hrs)
22.15
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
2006
11
1
Unknown
Unknown
Unknown
16:00
2
8.3
E
Unknown
19.8
0.01
flat
increasing
increasing
decreasing
decreasing
decreasing
2006
11
1
Virga to Rain
Tall to Borderline
Scattered
23:30
56
8.3
SE
SE
13.6
2.20
flat
down - up
down - up
increasing
decreasing
down - up
2006
11
4
Virga to Rain
Tall to Shallow
Scattered
14:00
19.5
14.9
S
S
9.5
0.70
flat
up - down
flat
down - up
increasing
down - up
2006
11
5
Virga to Rain
Tall to Shallow
Continuous
15:00
59.5
16.0
NW
NW
11.2
5.99
decreasing
up - down
increasing
decreasing
increasing
down - up
2006
11
8
Rain
Shallow to Tall to Shallow
Scattered
09:00
25.5
9.7
SE
SE
6.1
0.70
decreasing
up - down
flat
down - up
increasing
decreasing
2006
11
9
Rain
Shallow to Borderline
Scattered
20:00
2
11.1
SW
SW
8.3
0.01
increasing
down - up
decreasing
up - down
increasing
flat
2006
11
10
Virga to Rain
Tall to Borderline
Continuous
09:00
30
8.0
SE
SE
9.9
1.25
decreasing
up - down
up - down
increasing
decreasing
down - up
2006
11
11
Rain
Shallow to Borderline to Shallow
Scattered
20:30
15.5
9.2
SW
S
13.1
0.03
increasing
decreasing
decreasing
increasing
increasing
increasing
2006
11
12
Virga to Rain
Tall to Shallow
Scattered
20:30
46
9.4
S
SE
16.2
0.44
increasing
up - down
decreasing
increasing
down - up
decreasing
2006
11
15
Virga to Rain
Tall to Borderline
Scattered
01:00
28.5
11.0
SE
S
15.3
0.35
up - down
increasing
down - up
down - up
decreasing
decreasing
2006
11
16
Rain
Shallow
Scattered
16:00
10.5
10.1
SE
SW
5.7
none
flat
increasing
flat
decreasing
increasing
increasing
2006
11
19
Virga to Rain
Tall to Shallow
Continuous
12:30
15
8.0
SE
SE
11.7
0.73
flat
flat
flat
increasing
flat
down - up
2006
11
20
Virga to Rain
Borderline
Scattered
10:30
2.5
10.0
SE
SE
6.5
none
up - down
flat
decreasing
flat
flat
increasing
2006
11
21
Rain
Tall to Borderline
Scattered
09:00
91.5
7.5
S
S
11.5
2.53
flat
decreasing
flat
increasing
decreasing
increasing
2006
11
25
Rain
Shallow
Scattered
11:00
1.5
5.1
W
W
6.3
none
down - up
up - down
up - down
decreasing
increasing
increasing
2006
11
26
Vigra to Rain
Shallow to Tall to Shallow
Scattered
08:00
43.5
4.1
S
SE
11.0
0.58
decreasing
up - down
increasing
up - down
decreasing
down - up
2006
11
28
Rain
Borderline to Shallow
Scattered
19:00
3.5
2.0
W
NW
5.0
0.01
flat
increasing
flat
decreasing
increasing
increasing
2006
11
30
Virga to Rain
Shallow to Tall to Shallow
Scattered
03:30
14.5
2.2
SE
E
4.6
0.18
flat
increasing
flat
increasing
decreasing
down - up
2006
12
01
Rain to Virga
Shallow
Scattered
09:30
16
4.5
SW
NW
2.1
none
decreasing
increasing
increasing
decreasing
increasing
up - down
2006
12
02
Unknown
Unknown
Unknown
20:00
2
7.0
SE
Unknown
8.3
0.01
increasing
increasing
decreasing
decreasing
decreasing
decreasing
2006
12
04
Rain
Borderline to Shallow
Scattered
14:00
3
1.7
SE
SE
13.0
none
flat
increasing
down - up
up - down
up - down
increasing
2006
12
05
Virga
Tall
Continuous
02:30
1
3.9
E
E
5.3
--
up - down
flat
down - up
flat
decreasing
down - up
2006
12
05
Unknown
Unknown
Unknown
22:00
2
7.9
SE
Unknown
0.0
0.01
increasing
flat
decreasing
flat
decreasing
flat
2006
12
09
Virga to Rain to Virga
Tall
Continuous
05:30
17
5.1
SE
SE
11.1
0.22
decreasing
increasing
increasing
up - down
decreasing
increasing
2006
12
10
Rain
Tall
Scattered
15:00
51
9.2
SE
SE
13.8
1.00
flat
up - down
decreasing
increasing
increasing
increasing
2006
12
13
Rain
Tall
Scattered
00:30
71.5
8.6
S
SE
13.7
2.51
up - down
up - down
down - up
down - up
decreasing
down - up
2006
12
16
Unknown
Unknown
Unknown
18:00
2
3.0
SE
Unknown
9.0
0.01
down - up
increasing
up - down
decreasing
decreasing
decreasing
2006
12
19
Unknown
Unknown
Unknown
20:00
2
3.5
SW
Unknown
4.3
0.01
increasing
increasing
decreasing
decreasing
decreasing
decreasing
2006
12
20
Virga to Rain
Shallow to Tall to Shallow
Scattered
18:00
19
2.5
SE
SE
15.3
0.50
increasing
flat
flat
increasing
down - up
down - up
2006
12
22
Rain
Borderline to Shallow
Continuous
02:30
7.5
4.1
S
NW
4.3
0.24
up - down
up - down
down - up
down - up
flat
increasing
2006
12
23
Virga to Rain
Borderline to Tall to Shallow
Scattered
05:30
23
4.7
SE
SE
7.5
0.50
flat
down - up
decreasing
increasing
decreasing
down - up
2006
12
24
Rain
Tall to Shallow
Continuous
15:30
22
5.8
SE
SE
12.7
1.37
increasing
down - up
decreasing
increasing
decreasing
down - up
2006
12
25
Rain
Tall to Borderline
Scattered
23:00
46.5
5.8
SW
NW
7.8
1.36
up - down
down - up
decreasing
increasing
decreasing
down - up
2006
12
29
Virga to Rain
Shallow
Scattered
20:30
2.5
4.6
SW
SW
12.4
none
down - up
decreasing
up - down
increasing
increasing
increasing
2006
12
30
Virga
Tall
Scattered
22:30
5
3.1
SE
SE
8.4
--
increasing
decreasing
decreasing
flat
decreasing
down - up
2007
01
01
Rain
Tall to Shallow
Continuous
17:30
9
3.1
SW
SW
11.7
0.12
increasing
down - up
flat
up - down
flat
decreasing
2007
01
02
Virga to Rain to Virga
Tall
Continuous
15:30
34
12.8
S
SE
13.1
0.60
increasing
decreasing
decreasing
up - down
decreasing
up - down
2007
01
04
Virga to Rain
Borderine to Tall to Borderline
Scattered
10:00
9
5.2
SW
SW
7.3
0.32
down - up
up - down
up - down
down - up
up - down
increasing
2007
01
05
Rain to Virga to Rain
Shallow to Tall to Borderline
Scattered
11:30
30.5
5.5
SE
S
13.4
0.62
increasing
increasing
down - up
down - up
increasing
down - up
2007
01
07
Virga to Rain
Tall to Shallow to Tall
Scattered
01:00
20.5
8.6
S
S
15.8
0.32
up - down
increasing
down - up
increasing
increasing
flat
2007
01
08
Virga to Rain
Shallow
Continuous
19:00
2.5
6.2
E
E
1.1
0.02
increasing
up - down
increasing
down - up
up - down
decreasing
2007
01
10
Rain
Shallow to Tall to Borderline
Scattered
00:00
27
3.1
SW
NW
8.0
0.50
increasing
decreasing
decreasing
down - up
decreasing
up - down
2007
01
16
Freezing Rain/Snow
Tall to Shallow
Scattered
16:00
9.5
-2.4
S
S
9.5
0.05
up - down
increasing
increasing
down - up
decreasing
increasing
2007
01
18
Virga to Rain
Tall to Borderline
Scattered
03:00
19
1.4
SE
SE
4.5
0.01
up - down
increasing
flat
decreasing
down - up
decreasing
2007
01
19
Virga to Rain
Borderline to Shallow
Scattered
14:00
26
2.7
SE
SE
5.6
0.14
flat
up - down
flat
increasing
decreasing
down - up
2007
01
20
Rain
Shallow
Scattered
22:00
5.5
6.5
SE
NE
3.1
0.01
increasing
decreasing
decreasing
increasing
up - down
increasing
2007
01
21
Virga to Rain to Virga
Tall to Shallow
Scattered
08:30
25
2.9
SE
NE
0.9
none
decreasing
down - up
decreasing
flat
increasing
increasing
2007
02
01
Virga to Rain
Tall
Scattered
23:00
31
2.9
SE
SE
4.3
0.01
increasing
down - up
decreasing
up - down
up - down
flat
2007
02
03
Rain to Virga
Borderline to Tall to Shallow
Scattered
18:00
21
3.7
S
SE
1.5
0.42
increasing
flat
decreasing
increasing
increasing
up - down
2007
02
06
Virga to Rain
Tall to Borderline
Scattered
19:00
6.5
10.0
SE
SE
3.3
none
increasing
up - down
decreasing
down - up
increasing
decreasing
2007
02
07
Virga to Rain
Tall to Shallow
Scattered
09:30
32.5
5.8
SE
SE
9.4
0.11
flat
up - down
flat
down - up
decreasing
increasing
2007
02
09
Rain
Borderline to Tall to Borderline
Continuous
07:00
12
7.8
SE
SE
12.9
0.29
down - up
down - up
up - down
up - down
decreasing
increasing
2007
02
10
Rain
Tall to Borderline
Scattered
18:00
45.5
8.3
SE
SE
10.1
0.41
increasing
down - up
increasing
decreasing
decreasing
down - up
2007
02
13
Virga to Rain
Shallow to Borderline to Shallow
Scattered
11:30
8.5
5.7
SE
SE
5.7
0.03
flat
increasing
flat
down - up
increasing
increasing
2007
02
14
Virga to Rain
Tall to Borderline
Scattered
18:00
51.5
10.1
S
SE
7.6
0.73
increasing
up - down
decreasing
increasing
decreasing
down - up
2007
02
18
Rain
Tall to Shallow to Borderline
Scattered
02:00
23
9.4
SW
SW
8.4
0.04
up - down
decreasing
down - up
up - down
decreasing
up - down
2007
02
19
Rain to Virga to Rain
Tall to Shallow to Tall
Scattered
12:30
45
8.0
SW
S
13.7
0.68
flat
up - down
decreasing
down - up
decreasing
down - up
2007
02
22
Rain to Virga
Borderline to Tall to Borderline
Scattered
02:00
43
5.2
SE
SE
9.7
0.30
down - up
down - up
up - down
increasing
decreasing
down - up
2007
02
24
Rain
Borderline to Tall to Borderline
Continuous
03:00
27
5.1
SE
SE
12.5
1.05
up - down
down - up
increasing
down - up
increasing
decreasing
2007
02
27
Rain
Borderline to Tall to Borderline
Continuous
16:00
12
4.8
S
SE
19.1
0.29
increasing
increasing
decreasing
up - down
decreasing
increasing
2007
02
28
Rain
Tall to Shallow
Scattered
12:00
73
4.2
S
SE
8.4
0.65
up - down
increasing
flat
down - up
increasing
increasing
2007
03
05
Virga to Rain to Virga
Tall to Borderline
Scattered
06:00
12
8.9
SE
SE
8.9
none
decreasing
flat
increasing
up - down
decreasing
down - up
2007
03
07
Virga to Rain
Tall to Borderline
Scattered
10:30
20
10.6
S
SE
9.4
0.19
decreasing
down - up
increasing
up - down
decreasing
increasing
2007
03
08
Rain to Virga to Rain
Shallow to Tall to Borderline
Scattered
13:30
11
10.0
S
SE
9.9
none
decreasing
up - down
increasing
down - up
increasing
decreasing
2007
03
09
Rain
Tall to Borderline
Scattered
10:00
25.5
8.9
SE
SE
8.6
0.12
decreasing
increasing
increasing
increasing
increasing
increasing
2007
03
10
Rain
Tall to Borderline to Tall
Scattered
16:30
17
12.5
SE
SE
9.0
0.03
flat
increasing
decreasing
down - up
down - up
decreasing
2007
03
12
Rain to Virga to Rain
Tall to Shallow
Scattered
06:30
15.5
12.5
W
SW
5.5
0.16
decreasing
decreasing
increasing
up - down
down - up
increasing
2007
03
14
Rain
Shallow
Scattered
18:00
24.5
8.2
S
SW
2.3
0.01
down - up
up - down
up - down
increasing
increasing
down - up
2007
03
15
Rain
Tall
Continuous
21:30
1
12.0
NE
NE
1.0
none
increasing
increasing
decreasing
decreasing
decreasing
decreasing
2007
03
17
Virga to Rain to Virga
Tall to Borderline
Scattered
23:30
8
15.7
SE
NE
5.8
none
increasing
decreasing
decreasing
increasing
decreasing
increasing
2007
03
18
Rain
Shallow
Continuous
16:00
2
14.3
SW
SW
8.4
none
flat
increasing
increasing
decreasing
flat
increasing
2007
03
19
Rain
Shallow to Tall to Borderline
Scattered
14:00
35
10.2
SW
W
9.6
1.32
decreasing
up - down
increasing
up - down
decreasing
increasing
2007
03
22
Virga to Rain
Tall
Scattered
22:30
4.5
13.3
NW
N
6.0
none
increasing
decreasing
decreasing
increasing
decreasing
increasing
2007
03
23
Unknown
Unknown
Unknown
22:00
46
11.7
S
Unknown
5.9
1.80
increasing
up - down
decreasing
up - down
decreasing
down - up
2007
03
26
Rain
Borderline to Tall to Shallow
Scattered
16:00
32
8.0
SW
SW
7.3
0.12
down - up
down - up
up - down
up - down
decreasing
increasing
2007
03
28
Rain
Shallow
Scattered
07:30
8
5.2
SW
SW
2.5
none
decreasing
up - down
increasing
increasing
increasing
increasing
2007
03
30
Rain
Tall to Borderline to Tall
Scattered
12:30
34.5
12.1
S
SW
5.0
0.34
decreasing
up - down
increasing
down - up
decreasing
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