Table 2: A list of variables that correlate to Pacific or Atlantic Region monthly blocking occurrences and days at three different levels of statistical significance from January 2011 to December 2016.
(a)

VariableCorrelation to Pacific blockingCorrelation to Pacific blocking days

At 99% confidence level (>)
 West Pacific Oscillation−0.34−0.35
 Midwest monthly temperature anomaly−0.32−0.39
At 95% confidence level (>)
 Atlantic Region blocking0.250.24
At 90% confidence level (>)
 None

(b)

VariableCorrelation to Atlantic blockingCorrelation to Atlantic blocking days

At 99% confidence level (>)
 West Pacific Oscillation−0.34−0.35
At 95% confidence level (>)
 Pacific Region blocking0.250.24
 NAO0.200.27
At 90% confidence level (>)
 Midwest monthly temperature anomalyNone−0.19
 PNA0.160.16