Virga to Rain Storm Summary of 2007-2008 Winter Season (November - March) - 27 Storms

Portland International Airport Weather Station, Oregon (45°35'N , 122°36'W / Elevation: 5.8 m)
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Storm Summary of 2006-2007 Winter Season (November - March)

Storm Summary of 2007-2008 Winter Season (November - March)

Storm Summary of 2008-2009 Winter Season (December - March)

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

* = 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/Rain
Virga to Rain to Virga
Rain to Virga to Rain
Virga
Unknown
Continuity
Continuous
Scattered
Average
All
Page
Temp. (°C)
6.61
6.73
RH (%)
84.5
84.6
Wind Direction
184°
182°
Wind Speed (m/s)
7.6
8.2
Pressure (hPa)
1019
1018
Precipitation (in)
0.56
0.63
Total Precipitation (in.)
15.12
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
Borderline to Tall to Shallow/Borderline
Shallow
Shallow to Tall/Borderline
Shallow to Tall/ Borderline to Shallow
Shallow to Tall to Borderline
Avg. Duration (hrs)
33.13
Trends
Wind Direction
Temperature
RH
Pressure
Year
Month
Day
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
2007
11
09
Borderline to Tall
Scattered
19:00
19.5
12.2
SE
SE
7.9
0.41
increasing
flat
decreasing
increasing
up - down
decreasing
2007
11
12
Tall to Shallow to Borderline
Scattered
10:30
19
10.7
SW
S
11.9
0.15
flat
up - down
decreasing
up - down
decreasing
down - up
2007
11
15
Tall to Borderline
Scattered
00:30
74
10.7
S
W
9.5
1.86
up - down
increasing
down - up
increasing
decreasing
down - up
2007
11
18
Tall
Continuous
11:00
20
6.0
SW
NW
5.5
0.91
decreasing
decreasing
increasing
increasing
up - down
down - up
2007
11
26
Tall to Shallow
Scattered
15:00
36
4.4
SE
SE
5.6
0.57
increasing
increasing
decreasing
increasing
decreasing
down - up
2007
11
28
Tall to Borderline
Scattered
19:00
40
4.0
SE
SE
7.0
1.08
increasing
up - down
flat
up - down
decreasing
up - down
2007
11
30
Borderline to Shallow
Continuous
19:00
3
4.0
SE
SE
3.0
none
flat
increasing
flat
decreasing
decreasing
decreasing
2007
12
22
Tall to Borderline
Continuous
09:00
15
4.3
NE
NE
9.6
0.38
down - up
increasing
up - down
increasing
decreasing
decreasing
2007
12
25
Tall to Borderline
Scattered
16:30
78.5
2.9
S
SE
9.1
1.18
increasing
increasing
flat
flat
decreasing
up - down
2007
12
29
Borderline to Tall to Borderline
Scattered
17:30
39
3.9
SW
SE
8.6
0.78
down - up
decreasing
flat
down - up
flat
increasing
2008
01
02
Tall
Continuous
06:00
46
3.5
SE
SE
14.9
1.05
flat
down - up
increasing
increasing
decreasing
decreasing
2008
01
04
Tall to Shallow
Scattered
11:00
43.5
6.1
SE
SE
15.3
0.56
down - up
up - down
flat
down - up
decreasing
down - up
2008
01
09
Tall to Shallow
Scattered
20:30
53.5
7.4
SE
SE
10.8
0.58
increasing
increasing
up - down
up - down
up - down
down - up
2008
01
12
Borderline to Tall to Shallow
Scattered
07:00
22
8.1
SE
SE
9.6
0.25
decreasing
up - down
up - down
decreasing
decreasing
increasing
2008
01
17
Shallow
Scattered
16:30
8
1.8
SE
SE
0.3
none
increasing
increasing
flat
down - up
decreasing
decreasing
2008
02
06
Tall to Borderline
Scattered
16:30
60
6.8
SW
S
13.1
1.05
decreasing
increasing
up - down
down - up
increasing
down - up
2008
02
19
Tall to Borderline
Scattered
21:30
16.5
8.0
SW
W
2.6
0.01
increasing
decreasing
down - up
increasing
increasing
increasing
2008
02
29
Tall
Continuous
08:00
20.5
10.6
SW
SW
8.9
0.10
decreasing
up - down
increasing
down - up
decreasing
down - up
2008
03
01
Shallow to Tall
Scattered
10:00
16
7.8
SE
NW
8.3
0.09
decreasing
up - down
increasing
down - up
increasing
increasing
2008
03
03
Tall to Shallow
Scattered
13:30
7.5
6.7
SW
SE
7.8
0.09
flat
up - down
flat
up - down
decreasing
down - up
2008
03
07
Tall to Shallow
Scattered
19:00
16
8.5
SW
SE
2.8
0.87
increasing
up - down
decreasing
down - up
decreasing
down - up
2008
03
12
Tall to Shallow
Scattered
09:00
96.5
8.1
SW
SE
8.5
1.39
decreasing
up - down
increasing
down - up
decreasing
down - up
2008
03
19
Tall to Borderline
Scattered
13:00
45.5
6.9
S
SW
8.2
0.66
decreasing
up - down
increasing
down - up
decreasing
increasing
2008
03
21
Shallow
Scattered
19:00
2.5
8.0
SW
SW
2.4
none
increasing
increasing
decreasing
decreasing
increasing
flat
2008
03
23
Tall to Borderline
Scattered
06:00
32.5
8.4
S
SE
9.6
0.28
decreasing
decreasing
increasing
increasing
down - up
down - up
2008
03
25
Borderline to Tall
Scattered
17:30
18.5
7.6
S
SE
9.7
0.30
increasing
up - down
decreasing
down - up
flat
decreasing
2008
03
28
Borderline to Tall to Borderline
Scattered
07:30
45.5
4.3
S
SE
11.0
0.52
decreasing
up - down
increasing
down - up
decreasing
down - up

Version 2, 11 July 2013

web page credits: Micheal Tai Bryant, Sandra Yuter

This research is a collaboration by the
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. 0544766. Any opinions, findings and conclusions or recomendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the National Science Foundation (NSF).

contacts:
Dr. Sandra Yuter seyuter@ncsu.edu