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Supplementary Figure 1: Maps showing the location of the grid points used in the analysis of
3
accumulated rainfall.
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5
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Supplementary Figure 2: Fields of accumulated daily precipitation (in mm) from 10th to 15th
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September 2013 in the observations (left column), in the ensemble mean forecast initialized at
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12UTC 6th September 2013 (middle column), and in the ensemble mean forecast initialized at
9
12UTC 7th September 2013 (right column). (Note that precipitation on 10th September 2013
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corresponds to an accumulation from 12UTC 9th September to 12UTC 10th September.) White
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areas over the United States correspond to rainfall < 5 mm / day.
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Supplementary Figure 3: Accumulated rainfall for the eight forecast initialization times (12UTC
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5th to 12th September 2013) for the observations, eight models and ensemble mean for a 1.5° ×
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1.5° area surrounding Boulder Colorado.
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Supplementary Figure 4: Accumulated rainfall for the eight forecast initialization times (12UTC
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5th to 12th September 2013) for the observations, eight models and ensemble mean for the state of
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Colorado.
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Supplementary Table 1: Characteristics of the eight global climate models used in the analysis.
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The
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(http://tigge.ecmwf.int/models.html) accessed on 11th November 2013.
model
details
were
taken
from
the
ECMWF
TIGGE
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Model
CMA (China)
CMC (Canada)
Grid Resolution
TL213L31
600×300 Gaussian
global grid, L74
384×196 (0.9375
degrees), L28
Initialization Time Used
12 UTC
12 UTC
Forecast length
T+240h
T+384h
12 UTC
T+360h
T639 (32 km) (010d) L62; T319 (63
km) (10-15d) L62.
T319
(reduced
linear
Gaussian
grid) L60.
12 UTC
T+360h
12 UTC
T+264h
KMA (Korea)
0.5625° longitude
by 0.375° latitude
(Arakawa C grid) also referred to as
N320, L80
12 UTC
T+288h
NCEP (USA)
UKMO (UK)
T126L28
0.8333° longitude
by 0.5555° latitude
(Arakawa C grid) also referred to as
N216 L85
12 UTC
12 UTC
T+384h
T+360h
CPTEC (Brazil)
ECMWF (Europe)
JMA (Japan)
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website